Android 电话系统框架介绍

在android系统中rild运行在AP上，AP上的应用通过rild发送AT指令给BP，BP接收到信息后又通过rild传送给AP。AP与BP之间有两种通信方式：

1.Solicited Response:Ap向Bp发送请求，Bp给Ap发送回复,该类型的AT指令及其回调函数以数组的形式存放在Ril_commands.h文件中：

    {数组中的索引号，请求回调函数，响应回调函数}

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1. {0, NULL, NULL},                   //none  
2. {RIL_REQUEST_GET_SIM_STATUS, dispatchVoid, responseSimStatus},  
3. {RIL_REQUEST_ENTER_SIM_PIN, dispatchStrings, responseInts},  
4. {RIL_REQUEST_ENTER_SIM_PUK, dispatchStrings, responseInts},  
5. {RIL_REQUEST_ENTER_SIM_PIN2, dispatchStrings, responseInts},  
6. {RIL_REQUEST_ENTER_SIM_PUK2, dispatchStrings, responseInts},  
7. {RIL_REQUEST_CHANGE_SIM_PIN, dispatchStrings, responseInts},  
8. {RIL_REQUEST_CHANGE_SIM_PIN2, dispatchStrings, responseInts},  
9. {RIL_REQUEST_ENTER_NETWORK_DEPERSONALIZATION, dispatchStrings, responseInts},  
10. {RIL_REQUEST_GET_CURRENT_CALLS, dispatchVoid, responseCallList},  
11. {RIL_REQUEST_DIAL, dispatchDial, responseVoid},  
12. {RIL_REQUEST_GET_IMSI, dispatchStrings, responseString},  
13. {RIL_REQUEST_HANGUP, dispatchInts, responseVoid},  
14. {RIL_REQUEST_HANGUP_WAITING_OR_BACKGROUND, dispatchVoid, responseVoid},  
15. {RIL_REQUEST_HANGUP_FOREGROUND_RESUME_BACKGROUND, dispatchVoid, responseVoid},  
16. {RIL_REQUEST_SWITCH_WAITING_OR_HOLDING_AND_ACTIVE, dispatchVoid, responseVoid},  
17. {RIL_REQUEST_CONFERENCE, dispatchVoid, responseVoid},  
18. {RIL_REQUEST_UDUB, dispatchVoid, responseVoid},  
19. {RIL_REQUEST_LAST_CALL_FAIL_CAUSE, dispatchVoid, responseInts},  
20. {RIL_REQUEST_SIGNAL_STRENGTH, dispatchVoid, responseRilSignalStrength},  
21. {RIL_REQUEST_VOICE_REGISTRATION_STATE, dispatchVoid, responseStrings},  
22. {RIL_REQUEST_DATA_REGISTRATION_STATE, dispatchVoid, responseStrings},  
23. {RIL_REQUEST_OPERATOR, dispatchVoid, responseStrings},  
24. {RIL_REQUEST_RADIO_POWER, dispatchInts, responseVoid},  
25. {RIL_REQUEST_DTMF, dispatchString, responseVoid},  
26. {RIL_REQUEST_SEND_SMS, dispatchStrings, responseSMS},  
27. {RIL_REQUEST_SEND_SMS_EXPECT_MORE, dispatchStrings, responseSMS},  
28. {RIL_REQUEST_SETUP_DATA_CALL, dispatchDataCall, responseSetupDataCall},  
29. {RIL_REQUEST_SIM_IO, dispatchSIM_IO, responseSIM_IO},  
30. {RIL_REQUEST_SEND_USSD, dispatchString, responseVoid},  
31. {RIL_REQUEST_CANCEL_USSD, dispatchVoid, responseVoid},  
32. {RIL_REQUEST_GET_CLIR, dispatchVoid, responseInts},  
33. {RIL_REQUEST_SET_CLIR, dispatchInts, responseVoid},  
34. {RIL_REQUEST_QUERY_CALL_FORWARD_STATUS, dispatchCallForward, responseCallForwards},  
35. {RIL_REQUEST_SET_CALL_FORWARD, dispatchCallForward, responseVoid},  
36. {RIL_REQUEST_QUERY_CALL_WAITING, dispatchInts, responseInts},  
37. {RIL_REQUEST_SET_CALL_WAITING, dispatchInts, responseVoid},  
38. {RIL_REQUEST_SMS_ACKNOWLEDGE, dispatchInts, responseVoid},  
39. {RIL_REQUEST_GET_IMEI, dispatchVoid, responseString},  
40. {RIL_REQUEST_GET_IMEISV, dispatchVoid, responseString},  
41. {RIL_REQUEST_ANSWER,dispatchVoid, responseVoid},  
42. {RIL_REQUEST_DEACTIVATE_DATA_CALL, dispatchStrings, responseVoid},  
43. {RIL_REQUEST_QUERY_FACILITY_LOCK, dispatchStrings, responseInts},  
44. {RIL_REQUEST_SET_FACILITY_LOCK, dispatchStrings, responseInts},  
45. {RIL_REQUEST_CHANGE_BARRING_PASSWORD, dispatchStrings, responseVoid},  
46. {RIL_REQUEST_QUERY_NETWORK_SELECTION_MODE, dispatchVoid, responseInts},  
47. {RIL_REQUEST_SET_NETWORK_SELECTION_AUTOMATIC, dispatchVoid, responseVoid},  
48. {RIL_REQUEST_SET_NETWORK_SELECTION_MANUAL, dispatchString, responseVoid},  
49. {RIL_REQUEST_QUERY_AVAILABLE_NETWORKS , dispatchVoid, responseStrings},  
50. {RIL_REQUEST_DTMF_START, dispatchString, responseVoid},  
51. {RIL_REQUEST_DTMF_STOP, dispatchVoid, responseVoid},  
52. {RIL_REQUEST_BASEBAND_VERSION, dispatchVoid, responseString},  
53. {RIL_REQUEST_SEPARATE_CONNECTION, dispatchInts, responseVoid},  
54. {RIL_REQUEST_SET_MUTE, dispatchInts, responseVoid},  
55. {RIL_REQUEST_GET_MUTE, dispatchVoid, responseInts},  
56. {RIL_REQUEST_QUERY_CLIP, dispatchVoid, responseInts},  
57. {RIL_REQUEST_LAST_DATA_CALL_FAIL_CAUSE, dispatchVoid, responseInts},  
58. {RIL_REQUEST_DATA_CALL_LIST, dispatchVoid, responseDataCallList},  
59. {RIL_REQUEST_RESET_RADIO, dispatchVoid, responseVoid},  
60. {RIL_REQUEST_OEM_HOOK_RAW, dispatchRaw, responseRaw},  
61. {RIL_REQUEST_OEM_HOOK_STRINGS, dispatchStrings, responseStrings},  
62. {RIL_REQUEST_SCREEN_STATE, dispatchInts, responseVoid},  
63. {RIL_REQUEST_SET_SUPP_SVC_NOTIFICATION, dispatchInts, responseVoid},  
64. {RIL_REQUEST_WRITE_SMS_TO_SIM, dispatchSmsWrite, responseInts},  
65. {RIL_REQUEST_DELETE_SMS_ON_SIM, dispatchInts, responseVoid},  
66. {RIL_REQUEST_SET_BAND_MODE, dispatchInts, responseVoid},  
67. {RIL_REQUEST_QUERY_AVAILABLE_BAND_MODE, dispatchVoid, responseInts},  
68. {RIL_REQUEST_STK_GET_PROFILE, dispatchVoid, responseString},  
69. {RIL_REQUEST_STK_SET_PROFILE, dispatchString, responseVoid},  
70. {RIL_REQUEST_STK_SEND_ENVELOPE_COMMAND, dispatchString, responseString},  
71. {RIL_REQUEST_STK_SEND_TERMINAL_RESPONSE, dispatchString, responseVoid},  
72. {RIL_REQUEST_STK_HANDLE_CALL_SETUP_REQUESTED_FROM_SIM, dispatchInts, responseVoid},  
73. {RIL_REQUEST_EXPLICIT_CALL_TRANSFER, dispatchVoid, responseVoid},  
74. {RIL_REQUEST_SET_PREFERRED_NETWORK_TYPE, dispatchInts, responseVoid},  
75. {RIL_REQUEST_GET_PREFERRED_NETWORK_TYPE, dispatchVoid, responseInts},  
76. {RIL_REQUEST_GET_NEIGHBORING_CELL_IDS, dispatchVoid, responseCellList},  
77. {RIL_REQUEST_SET_LOCATION_UPDATES, dispatchInts, responseVoid},  
78. {RIL_REQUEST_CDMA_SET_SUBSCRIPTION_SOURCE, dispatchInts, responseVoid},  
79. {RIL_REQUEST_CDMA_SET_ROAMING_PREFERENCE, dispatchInts, responseVoid},  
80. {RIL_REQUEST_CDMA_QUERY_ROAMING_PREFERENCE, dispatchVoid, responseInts},  
81. {RIL_REQUEST_SET_TTY_MODE, dispatchInts, responseVoid},  
82. {RIL_REQUEST_QUERY_TTY_MODE, dispatchVoid, responseInts},  
83. {RIL_REQUEST_CDMA_SET_PREFERRED_VOICE_PRIVACY_MODE, dispatchInts, responseVoid},  
84. {RIL_REQUEST_CDMA_QUERY_PREFERRED_VOICE_PRIVACY_MODE, dispatchVoid, responseInts},  
85. {RIL_REQUEST_CDMA_FLASH, dispatchString, responseVoid},  
86. {RIL_REQUEST_CDMA_BURST_DTMF, dispatchStrings, responseVoid},  
87. {RIL_REQUEST_CDMA_VALIDATE_AND_WRITE_AKEY, dispatchString, responseVoid},  
88. {RIL_REQUEST_CDMA_SEND_SMS, dispatchCdmaSms, responseSMS},  
89. {RIL_REQUEST_CDMA_SMS_ACKNOWLEDGE, dispatchCdmaSmsAck, responseVoid},  
90. {RIL_REQUEST_GSM_GET_BROADCAST_SMS_CONFIG, dispatchVoid, responseGsmBrSmsCnf},  
91. {RIL_REQUEST_GSM_SET_BROADCAST_SMS_CONFIG, dispatchGsmBrSmsCnf, responseVoid},  
92. {RIL_REQUEST_GSM_SMS_BROADCAST_ACTIVATION, dispatchInts, responseVoid},  
93. {RIL_REQUEST_CDMA_GET_BROADCAST_SMS_CONFIG, dispatchVoid, responseCdmaBrSmsCnf},  
94. {RIL_REQUEST_CDMA_SET_BROADCAST_SMS_CONFIG, dispatchCdmaBrSmsCnf, responseVoid},  
95. {RIL_REQUEST_CDMA_SMS_BROADCAST_ACTIVATION, dispatchInts, responseVoid},  
96. {RIL_REQUEST_CDMA_SUBSCRIPTION, dispatchVoid, responseStrings},  
97. {RIL_REQUEST_CDMA_WRITE_SMS_TO_RUIM, dispatchRilCdmaSmsWriteArgs, responseInts},  
98. {RIL_REQUEST_CDMA_DELETE_SMS_ON_RUIM, dispatchInts, responseVoid},  
99. {RIL_REQUEST_DEVICE_IDENTITY, dispatchVoid, responseStrings},  
100. {RIL_REQUEST_EXIT_EMERGENCY_CALLBACK_MODE, dispatchVoid, responseVoid},  
101. {RIL_REQUEST_GET_SMSC_ADDRESS, dispatchVoid, responseString},  
102. {RIL_REQUEST_SET_SMSC_ADDRESS, dispatchString, responseVoid},  
103. {RIL_REQUEST_REPORT_SMS_MEMORY_STATUS, dispatchInts, responseVoid},  
104. {RIL_REQUEST_REPORT_STK_SERVICE_IS_RUNNING, dispatchVoid, responseVoid},  
105. {RIL_REQUEST_CDMA_GET_SUBSCRIPTION_SOURCE, dispatchCdmaSubscriptionSource, responseInts},  
106. {RIL_REQUEST_ISIM_AUTHENTICATION, dispatchString, responseString},  
107. {RIL_REQUEST_ACKNOWLEDGE_INCOMING_GSM_SMS_WITH_PDU, dispatchStrings, responseVoid},  
108. {RIL_REQUEST_STK_SEND_ENVELOPE_WITH_STATUS, dispatchString, responseSIM_IO},  
109. {RIL_REQUEST_VOICE_RADIO_TECH, dispatchVoiceRadioTech, responseInts},  

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1. {0, NULL, NULL},                   //none  
2. {RIL_REQUEST_GET_SIM_STATUS, dispatchVoid, responseSimStatus},  
3. {RIL_REQUEST_ENTER_SIM_PIN, dispatchStrings, responseInts},  
4. {RIL_REQUEST_ENTER_SIM_PUK, dispatchStrings, responseInts},  
5. {RIL_REQUEST_ENTER_SIM_PIN2, dispatchStrings, responseInts},  
6. {RIL_REQUEST_ENTER_SIM_PUK2, dispatchStrings, responseInts},  
7. {RIL_REQUEST_CHANGE_SIM_PIN, dispatchStrings, responseInts},  
8. {RIL_REQUEST_CHANGE_SIM_PIN2, dispatchStrings, responseInts},  
9. {RIL_REQUEST_ENTER_NETWORK_DEPERSONALIZATION, dispatchStrings, responseInts},  
10. {RIL_REQUEST_GET_CURRENT_CALLS, dispatchVoid, responseCallList},  
11. {RIL_REQUEST_DIAL, dispatchDial, responseVoid},  
12. {RIL_REQUEST_GET_IMSI, dispatchStrings, responseString},  
13. {RIL_REQUEST_HANGUP, dispatchInts, responseVoid},  
14. {RIL_REQUEST_HANGUP_WAITING_OR_BACKGROUND, dispatchVoid, responseVoid},  
15. {RIL_REQUEST_HANGUP_FOREGROUND_RESUME_BACKGROUND, dispatchVoid, responseVoid},  
16. {RIL_REQUEST_SWITCH_WAITING_OR_HOLDING_AND_ACTIVE, dispatchVoid, responseVoid},  
17. {RIL_REQUEST_CONFERENCE, dispatchVoid, responseVoid},  
18. {RIL_REQUEST_UDUB, dispatchVoid, responseVoid},  
19. {RIL_REQUEST_LAST_CALL_FAIL_CAUSE, dispatchVoid, responseInts},  
20. {RIL_REQUEST_SIGNAL_STRENGTH, dispatchVoid, responseRilSignalStrength},  
21. {RIL_REQUEST_VOICE_REGISTRATION_STATE, dispatchVoid, responseStrings},  
22. {RIL_REQUEST_DATA_REGISTRATION_STATE, dispatchVoid, responseStrings},  
23. {RIL_REQUEST_OPERATOR, dispatchVoid, responseStrings},  
24. {RIL_REQUEST_RADIO_POWER, dispatchInts, responseVoid},  
25. {RIL_REQUEST_DTMF, dispatchString, responseVoid},  
26. {RIL_REQUEST_SEND_SMS, dispatchStrings, responseSMS},  
27. {RIL_REQUEST_SEND_SMS_EXPECT_MORE, dispatchStrings, responseSMS},  
28. {RIL_REQUEST_SETUP_DATA_CALL, dispatchDataCall, responseSetupDataCall},  
29. {RIL_REQUEST_SIM_IO, dispatchSIM_IO, responseSIM_IO},  
30. {RIL_REQUEST_SEND_USSD, dispatchString, responseVoid},  
31. {RIL_REQUEST_CANCEL_USSD, dispatchVoid, responseVoid},  
32. {RIL_REQUEST_GET_CLIR, dispatchVoid, responseInts},  
33. {RIL_REQUEST_SET_CLIR, dispatchInts, responseVoid},  
34. {RIL_REQUEST_QUERY_CALL_FORWARD_STATUS, dispatchCallForward, responseCallForwards},  
35. {RIL_REQUEST_SET_CALL_FORWARD, dispatchCallForward, responseVoid},  
36. {RIL_REQUEST_QUERY_CALL_WAITING, dispatchInts, responseInts},  
37. {RIL_REQUEST_SET_CALL_WAITING, dispatchInts, responseVoid},  
38. {RIL_REQUEST_SMS_ACKNOWLEDGE, dispatchInts, responseVoid},  
39. {RIL_REQUEST_GET_IMEI, dispatchVoid, responseString},  
40. {RIL_REQUEST_GET_IMEISV, dispatchVoid, responseString},  
41. {RIL_REQUEST_ANSWER,dispatchVoid, responseVoid},  
42. {RIL_REQUEST_DEACTIVATE_DATA_CALL, dispatchStrings, responseVoid},  
43. {RIL_REQUEST_QUERY_FACILITY_LOCK, dispatchStrings, responseInts},  
44. {RIL_REQUEST_SET_FACILITY_LOCK, dispatchStrings, responseInts},  
45. {RIL_REQUEST_CHANGE_BARRING_PASSWORD, dispatchStrings, responseVoid},  
46. {RIL_REQUEST_QUERY_NETWORK_SELECTION_MODE, dispatchVoid, responseInts},  
47. {RIL_REQUEST_SET_NETWORK_SELECTION_AUTOMATIC, dispatchVoid, responseVoid},  
48. {RIL_REQUEST_SET_NETWORK_SELECTION_MANUAL, dispatchString, responseVoid},  
49. {RIL_REQUEST_QUERY_AVAILABLE_NETWORKS , dispatchVoid, responseStrings},  
50. {RIL_REQUEST_DTMF_START, dispatchString, responseVoid},  
51. {RIL_REQUEST_DTMF_STOP, dispatchVoid, responseVoid},  
52. {RIL_REQUEST_BASEBAND_VERSION, dispatchVoid, responseString},  
53. {RIL_REQUEST_SEPARATE_CONNECTION, dispatchInts, responseVoid},  
54. {RIL_REQUEST_SET_MUTE, dispatchInts, responseVoid},  
55. {RIL_REQUEST_GET_MUTE, dispatchVoid, responseInts},  
56. {RIL_REQUEST_QUERY_CLIP, dispatchVoid, responseInts},  
57. {RIL_REQUEST_LAST_DATA_CALL_FAIL_CAUSE, dispatchVoid, responseInts},  
58. {RIL_REQUEST_DATA_CALL_LIST, dispatchVoid, responseDataCallList},  
59. {RIL_REQUEST_RESET_RADIO, dispatchVoid, responseVoid},  
60. {RIL_REQUEST_OEM_HOOK_RAW, dispatchRaw, responseRaw},  
61. {RIL_REQUEST_OEM_HOOK_STRINGS, dispatchStrings, responseStrings},  
62. {RIL_REQUEST_SCREEN_STATE, dispatchInts, responseVoid},  
63. {RIL_REQUEST_SET_SUPP_SVC_NOTIFICATION, dispatchInts, responseVoid},  
64. {RIL_REQUEST_WRITE_SMS_TO_SIM, dispatchSmsWrite, responseInts},  
65. {RIL_REQUEST_DELETE_SMS_ON_SIM, dispatchInts, responseVoid},  
66. {RIL_REQUEST_SET_BAND_MODE, dispatchInts, responseVoid},  
67. {RIL_REQUEST_QUERY_AVAILABLE_BAND_MODE, dispatchVoid, responseInts},  
68. {RIL_REQUEST_STK_GET_PROFILE, dispatchVoid, responseString},  
69. {RIL_REQUEST_STK_SET_PROFILE, dispatchString, responseVoid},  
70. {RIL_REQUEST_STK_SEND_ENVELOPE_COMMAND, dispatchString, responseString},  
71. {RIL_REQUEST_STK_SEND_TERMINAL_RESPONSE, dispatchString, responseVoid},  
72. {RIL_REQUEST_STK_HANDLE_CALL_SETUP_REQUESTED_FROM_SIM, dispatchInts, responseVoid},  
73. {RIL_REQUEST_EXPLICIT_CALL_TRANSFER, dispatchVoid, responseVoid},  
74. {RIL_REQUEST_SET_PREFERRED_NETWORK_TYPE, dispatchInts, responseVoid},  
75. {RIL_REQUEST_GET_PREFERRED_NETWORK_TYPE, dispatchVoid, responseInts},  
76. {RIL_REQUEST_GET_NEIGHBORING_CELL_IDS, dispatchVoid, responseCellList},  
77. {RIL_REQUEST_SET_LOCATION_UPDATES, dispatchInts, responseVoid},  
78. {RIL_REQUEST_CDMA_SET_SUBSCRIPTION_SOURCE, dispatchInts, responseVoid},  
79. {RIL_REQUEST_CDMA_SET_ROAMING_PREFERENCE, dispatchInts, responseVoid},  
80. {RIL_REQUEST_CDMA_QUERY_ROAMING_PREFERENCE, dispatchVoid, responseInts},  
81. {RIL_REQUEST_SET_TTY_MODE, dispatchInts, responseVoid},  
82. {RIL_REQUEST_QUERY_TTY_MODE, dispatchVoid, responseInts},  
83. {RIL_REQUEST_CDMA_SET_PREFERRED_VOICE_PRIVACY_MODE, dispatchInts, responseVoid},  
84. {RIL_REQUEST_CDMA_QUERY_PREFERRED_VOICE_PRIVACY_MODE, dispatchVoid, responseInts},  
85. {RIL_REQUEST_CDMA_FLASH, dispatchString, responseVoid},  
86. {RIL_REQUEST_CDMA_BURST_DTMF, dispatchStrings, responseVoid},  
87. {RIL_REQUEST_CDMA_VALIDATE_AND_WRITE_AKEY, dispatchString, responseVoid},  
88. {RIL_REQUEST_CDMA_SEND_SMS, dispatchCdmaSms, responseSMS},  
89. {RIL_REQUEST_CDMA_SMS_ACKNOWLEDGE, dispatchCdmaSmsAck, responseVoid},  
90. {RIL_REQUEST_GSM_GET_BROADCAST_SMS_CONFIG, dispatchVoid, responseGsmBrSmsCnf},  
91. {RIL_REQUEST_GSM_SET_BROADCAST_SMS_CONFIG, dispatchGsmBrSmsCnf, responseVoid},  
92. {RIL_REQUEST_GSM_SMS_BROADCAST_ACTIVATION, dispatchInts, responseVoid},  
93. {RIL_REQUEST_CDMA_GET_BROADCAST_SMS_CONFIG, dispatchVoid, responseCdmaBrSmsCnf},  
94. {RIL_REQUEST_CDMA_SET_BROADCAST_SMS_CONFIG, dispatchCdmaBrSmsCnf, responseVoid},  
95. {RIL_REQUEST_CDMA_SMS_BROADCAST_ACTIVATION, dispatchInts, responseVoid},  
96. {RIL_REQUEST_CDMA_SUBSCRIPTION, dispatchVoid, responseStrings},  
97. {RIL_REQUEST_CDMA_WRITE_SMS_TO_RUIM, dispatchRilCdmaSmsWriteArgs, responseInts},  
98. {RIL_REQUEST_CDMA_DELETE_SMS_ON_RUIM, dispatchInts, responseVoid},  
99. {RIL_REQUEST_DEVICE_IDENTITY, dispatchVoid, responseStrings},  
100. {RIL_REQUEST_EXIT_EMERGENCY_CALLBACK_MODE, dispatchVoid, responseVoid},  
101. {RIL_REQUEST_GET_SMSC_ADDRESS, dispatchVoid, responseString},  
102. {RIL_REQUEST_SET_SMSC_ADDRESS, dispatchString, responseVoid},  
103. {RIL_REQUEST_REPORT_SMS_MEMORY_STATUS, dispatchInts, responseVoid},  
104. {RIL_REQUEST_REPORT_STK_SERVICE_IS_RUNNING, dispatchVoid, responseVoid},  
105. {RIL_REQUEST_CDMA_GET_SUBSCRIPTION_SOURCE, dispatchCdmaSubscriptionSource, responseInts},  
106. {RIL_REQUEST_ISIM_AUTHENTICATION, dispatchString, responseString},  
107. {RIL_REQUEST_ACKNOWLEDGE_INCOMING_GSM_SMS_WITH_PDU, dispatchStrings, responseVoid},  
108. {RIL_REQUEST_STK_SEND_ENVELOPE_WITH_STATUS, dispatchString, responseSIM_IO},  
109. {RIL_REQUEST_VOICE_RADIO_TECH, dispatchVoiceRadioTech, responseInts},  

2.unSolicited Response:Bp主动给Ap发送事件,该类型的AT指令及其回调函数以数组的形式存放在ril_unsol_commands.h文件中：

    {数组中的索引号，响应回调函数，类型}

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1. {RIL_UNSOL_RESPONSE_RADIO_STATE_CHANGED, responseVoid, WAKE_PARTIAL},  
2. {RIL_UNSOL_RESPONSE_CALL_STATE_CHANGED, responseVoid, WAKE_PARTIAL},  
3. {RIL_UNSOL_RESPONSE_VOICE_NETWORK_STATE_CHANGED, responseVoid, WAKE_PARTIAL},  
4. {RIL_UNSOL_RESPONSE_NEW_SMS, responseString, WAKE_PARTIAL},  
5. {RIL_UNSOL_RESPONSE_NEW_SMS_STATUS_REPORT, responseString, WAKE_PARTIAL},  
6. {RIL_UNSOL_RESPONSE_NEW_SMS_ON_SIM, responseInts, WAKE_PARTIAL},  
7. {RIL_UNSOL_ON_USSD, responseStrings, WAKE_PARTIAL},  
8. {RIL_UNSOL_ON_USSD_REQUEST, responseVoid, DONT_WAKE},  
9. {RIL_UNSOL_NITZ_TIME_RECEIVED, responseString, WAKE_PARTIAL},  
10. {RIL_UNSOL_SIGNAL_STRENGTH, responseRilSignalStrength, DONT_WAKE},  
11. {RIL_UNSOL_DATA_CALL_LIST_CHANGED, responseDataCallList, WAKE_PARTIAL},  
12. {RIL_UNSOL_SUPP_SVC_NOTIFICATION, responseSsn, WAKE_PARTIAL},  
13. {RIL_UNSOL_STK_SESSION_END, responseVoid, WAKE_PARTIAL},  
14. {RIL_UNSOL_STK_PROACTIVE_COMMAND, responseString, WAKE_PARTIAL},  
15. {RIL_UNSOL_STK_EVENT_NOTIFY, responseString, WAKE_PARTIAL},  
16. {RIL_UNSOL_STK_CALL_SETUP, responseInts, WAKE_PARTIAL},  
17. {RIL_UNSOL_SIM_SMS_STORAGE_FULL, responseVoid, WAKE_PARTIAL},  
18. {RIL_UNSOL_SIM_REFRESH, responseSimRefresh, WAKE_PARTIAL},  
19. {RIL_UNSOL_CALL_RING, responseCallRing, WAKE_PARTIAL},  
20. {RIL_UNSOL_RESPONSE_SIM_STATUS_CHANGED, responseVoid, WAKE_PARTIAL},  
21. {RIL_UNSOL_RESPONSE_CDMA_NEW_SMS, responseCdmaSms, WAKE_PARTIAL},  
22. {RIL_UNSOL_RESPONSE_NEW_BROADCAST_SMS, responseRaw, WAKE_PARTIAL},  
23. {RIL_UNSOL_CDMA_RUIM_SMS_STORAGE_FULL, responseVoid, WAKE_PARTIAL},  
24. {RIL_UNSOL_RESTRICTED_STATE_CHANGED, responseInts, WAKE_PARTIAL},  
25. {RIL_UNSOL_ENTER_EMERGENCY_CALLBACK_MODE, responseVoid, WAKE_PARTIAL},  
26. {RIL_UNSOL_CDMA_CALL_WAITING, responseCdmaCallWaiting, WAKE_PARTIAL},  
27. {RIL_UNSOL_CDMA_OTA_PROVISION_STATUS, responseInts, WAKE_PARTIAL},  
28. {RIL_UNSOL_CDMA_INFO_REC, responseCdmaInformationRecords, WAKE_PARTIAL},  
29. {RIL_UNSOL_OEM_HOOK_RAW, responseRaw, WAKE_PARTIAL},  
30. {RIL_UNSOL_RINGBACK_TONE, responseInts, WAKE_PARTIAL},  
31. {RIL_UNSOL_RESEND_INCALL_MUTE, responseVoid, WAKE_PARTIAL},  
32. {RIL_UNSOL_CDMA_SUBSCRIPTION_SOURCE_CHANGED, responseInts, WAKE_PARTIAL},  
33. {RIL_UNSOL_CDMA_PRL_CHANGED, responseInts, WAKE_PARTIAL},  
34. {RIL_UNSOL_EXIT_EMERGENCY_CALLBACK_MODE, responseVoid, WAKE_PARTIAL},  
35. {RIL_UNSOL_RIL_CONNECTED, responseInts, WAKE_PARTIAL},  
36. {RIL_UNSOL_VOICE_RADIO_TECH_CHANGED, responseInts, WAKE_PARTIAL},  

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1. {RIL_UNSOL_RESPONSE_RADIO_STATE_CHANGED, responseVoid, WAKE_PARTIAL},  
2. {RIL_UNSOL_RESPONSE_CALL_STATE_CHANGED, responseVoid, WAKE_PARTIAL},  
3. {RIL_UNSOL_RESPONSE_VOICE_NETWORK_STATE_CHANGED, responseVoid, WAKE_PARTIAL},  
4. {RIL_UNSOL_RESPONSE_NEW_SMS, responseString, WAKE_PARTIAL},  
5. {RIL_UNSOL_RESPONSE_NEW_SMS_STATUS_REPORT, responseString, WAKE_PARTIAL},  
6. {RIL_UNSOL_RESPONSE_NEW_SMS_ON_SIM, responseInts, WAKE_PARTIAL},  
7. {RIL_UNSOL_ON_USSD, responseStrings, WAKE_PARTIAL},  
8. {RIL_UNSOL_ON_USSD_REQUEST, responseVoid, DONT_WAKE},  
9. {RIL_UNSOL_NITZ_TIME_RECEIVED, responseString, WAKE_PARTIAL},  
10. {RIL_UNSOL_SIGNAL_STRENGTH, responseRilSignalStrength, DONT_WAKE},  
11. {RIL_UNSOL_DATA_CALL_LIST_CHANGED, responseDataCallList, WAKE_PARTIAL},  
12. {RIL_UNSOL_SUPP_SVC_NOTIFICATION, responseSsn, WAKE_PARTIAL},  
13. {RIL_UNSOL_STK_SESSION_END, responseVoid, WAKE_PARTIAL},  
14. {RIL_UNSOL_STK_PROACTIVE_COMMAND, responseString, WAKE_PARTIAL},  
15. {RIL_UNSOL_STK_EVENT_NOTIFY, responseString, WAKE_PARTIAL},  
16. {RIL_UNSOL_STK_CALL_SETUP, responseInts, WAKE_PARTIAL},  
17. {RIL_UNSOL_SIM_SMS_STORAGE_FULL, responseVoid, WAKE_PARTIAL},  
18. {RIL_UNSOL_SIM_REFRESH, responseSimRefresh, WAKE_PARTIAL},  
19. {RIL_UNSOL_CALL_RING, responseCallRing, WAKE_PARTIAL},  
20. {RIL_UNSOL_RESPONSE_SIM_STATUS_CHANGED, responseVoid, WAKE_PARTIAL},  
21. {RIL_UNSOL_RESPONSE_CDMA_NEW_SMS, responseCdmaSms, WAKE_PARTIAL},  
22. {RIL_UNSOL_RESPONSE_NEW_BROADCAST_SMS, responseRaw, WAKE_PARTIAL},  
23. {RIL_UNSOL_CDMA_RUIM_SMS_STORAGE_FULL, responseVoid, WAKE_PARTIAL},  
24. {RIL_UNSOL_RESTRICTED_STATE_CHANGED, responseInts, WAKE_PARTIAL},  
25. {RIL_UNSOL_ENTER_EMERGENCY_CALLBACK_MODE, responseVoid, WAKE_PARTIAL},  
26. {RIL_UNSOL_CDMA_CALL_WAITING, responseCdmaCallWaiting, WAKE_PARTIAL},  
27. {RIL_UNSOL_CDMA_OTA_PROVISION_STATUS, responseInts, WAKE_PARTIAL},  
28. {RIL_UNSOL_CDMA_INFO_REC, responseCdmaInformationRecords, WAKE_PARTIAL},  
29. {RIL_UNSOL_OEM_HOOK_RAW, responseRaw, WAKE_PARTIAL},  
30. {RIL_UNSOL_RINGBACK_TONE, responseInts, WAKE_PARTIAL},  
31. {RIL_UNSOL_RESEND_INCALL_MUTE, responseVoid, WAKE_PARTIAL},  
32. {RIL_UNSOL_CDMA_SUBSCRIPTION_SOURCE_CHANGED, responseInts, WAKE_PARTIAL},  
33. {RIL_UNSOL_CDMA_PRL_CHANGED, responseInts, WAKE_PARTIAL},  
34. {RIL_UNSOL_EXIT_EMERGENCY_CALLBACK_MODE, responseVoid, WAKE_PARTIAL},  
35. {RIL_UNSOL_RIL_CONNECTED, responseInts, WAKE_PARTIAL},  
36. {RIL_UNSOL_VOICE_RADIO_TECH_CHANGED, responseInts, WAKE_PARTIAL},  

不同手机厂商使用的AT命令不完全相同，为了保密，AP与BP之间通过各厂商自己的相关动态库来通信。

RIL模块由rild守护进程、libril.so、librefrence.so三部分组成：

  1.rild模块被编译为一个可执行文件，实现一个main函数作为整个ril模块的入口点。在初始化时使用dlopen打开librefrence_ril.so，从中取出并执行RIL_Init函数，得到RIL_RadioFunctions指针，通过RIL_register()函数注册到libril.so库中，其源码结构如下：

 2.libril.so是共享库，主要负责同上层的通信工作，接收ril的请求，并传递给librefrence_ril.so，同时将librefrence_ril.so返回的消息送给调用进程，源码结构如下所示：

3.librefrence_ril.so是由各手机厂商自己实现，在rild进程运行中通过dlopen方式加载，主要负责跟modem硬件通信，转换来自libril.so的请求为AT命令，同时监听Modem的反馈信息给libril.so

Android的电话系统主要分为三个部分，java层的各种电话相关应用，java层的Phone Service，主要为上层提供API，同时与native进行通信，可以看做为电话系统的客户端，native层的电话服务进程RILD，负责为上层提供各种电话功能服务，直接与modem进行交互：

Android电话系统设计框架图：

由于Android 开发者使用的Modem 是不一样的，各种指令格式，初始化序列都可能不一样，所以为了消除这些差别，Android 设计者将ril 做了一个抽象，使用一个虚拟电话的概念，不同modem相关的AT指令或者通信协议编译成相应的动态链接库.so文件，Rild 是具体的AT 指令合成者和应答解析者。

Android电话系统代码结构图：

RILD框架设计

在android的电话系统中，在native层实现了电话服务的服务端，由RILD服务与modem的交互，在java层实现电话的客户端，本文主要介绍电话系统的服务端RILD进程，以下是RILD的设计框架图：

RILD源码分析

接下来通过源码对RILD的整个框架进行详细介绍。

在kernel启动完成后，将启动第一个应用进程Init进程，在android之Init进程启动过程源码分析一文中对init进程的启动流程进行了详细的介绍。init进程在启动过程中将读取init.rc文件来启动一些重量级的native服务，rild进程就是通过配置在init.rc中来启动的。

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1. service ril-daemon /system/bin/rild  
2.     class main  
3.     socket rild stream 660 root radio  
4.     socket rild-debug stream 660 radio system  
5.     user root  
6.     group radio cache inet misc audio sdcard_rw log  

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1. service ril-daemon /system/bin/rild  
2.     class main  
3.     socket rild stream 660 root radio  
4.     socket rild-debug stream 660 radio system  
5.     user root  
6.     group radio cache inet misc audio sdcard_rw log  

RILD进程入口函数分析

接下来给出的是RILD进程启动的时序图：

hardware\ril\rild\rild.c

[cpp] 
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1. int main(int argc, char **argv)  
2. {  
3.     const char * rilLibPath = NULL;  
4.     char **rilArgv;  
5.     void *dlHandle;  
6.     const RIL_RadioFunctions *(*rilInit)(const struct RIL_Env *, int, char **);  
7.     const RIL_RadioFunctions *funcs;  
8.     char libPath[PROPERTY_VALUE_MAX];  
9.     unsigned char hasLibArgs = 0;  
10.     int i;  
11. 　　umask(S_IRGRP | S_IWGRP | S_IXGRP | S_IROTH | S_IWOTH | S_IXOTH);  
12. 　　//rild启动无参数  
13.     for (i = 1; i < argc ;) {  
14.         if (0 == strcmp(argv[i], “-l”) && (argc – i > 1)) {  
15.             rilLibPath = argv[i + 1];  
16.             i += 2;  
17.         } else if (0 == strcmp(argv[i], “–“)) {  
18.             i++;  
19.             hasLibArgs = 1;  
20.             break;  
21.         } else {  
22.             usage(argv[0]);  
23.         }  
24.     }  
25. 　　if (rilLibPath == NULL) {  
26. 　　    //通过Android属性系统读取属性”rild.libpath”的值，即lib库的存放路径  
27.         if ( 0 == property_get(LIB_PATH_PROPERTY, libPath, NULL)) {  
28.             goto done;  
29.         } else {  
30.             rilLibPath = libPath;  
31.         }  
32. 　　}  
33. ##################################################################################  
34.                             判断是否为模拟器  
35. ##################################################################################  
36. #if 1  
37.     {  
38.         static char*  arg_overrides[3];  
39.         static char   arg_device[32];  
40.         int           done = 0;  
41. #define  REFERENCE_RIL_PATH  “/system/lib/libreference-ril.so”  
42.         /* first, read /proc/cmdline into memory */  
43.         char          buffer[1024], *p, *q;  
44.         int           len;  
45.         int           fd = open(“/proc/cmdline”,O_RDONLY);  
46.         if (fd < 0) {  
47.             LOGD(“could not open /proc/cmdline:%s”, strerror(errno));  
48.             goto OpenLib;  
49.         }  
50.         //读取/proc/cmdline文件中的内容  
51.         do {  
52.             len = read(fd,buffer,sizeof(buffer)); }  
53.         while (len == -1 && errno == EINTR);  
54.         if (len < 0) {  
55.             LOGD(“could not read /proc/cmdline:%s”, strerror(errno));  
56.             close(fd);  
57.             goto OpenLib;  
58.         }  
59.         close(fd);  
60.         //判断是否为模拟器，对于真机，此处条件为false  
61.         if (strstr(buffer, “android.qemud=”) != NULL)  
62.         {  
63.             int  tries = 5;  
64. #define  QEMUD_SOCKET_NAME    “qemud”  
65.             while (1) {  
66.                 int  fd;  
67.                 sleep(1);  
68.                 fd = socket_local_client(QEMUD_SOCKET_NAME,  
69.                             ANDROID_SOCKET_NAMESPACE_RESERVED,  
70.                             SOCK_STREAM );  
71.                 if (fd >= 0) {  
72.                     close(fd);  
73.                     snprintf( arg_device, sizeof(arg_device), “%s/%s”,  
74.                                 ANDROID_SOCKET_DIR, QEMUD_SOCKET_NAME );  
75.                     arg_overrides[1] = “-s”;  
76.                     arg_overrides[2] = arg_device;  
77.                     done = 1;  
78.                     break;  
79.                 }  
80.                 LOGD(“could not connect to %s socket: %s”,QEMUD_SOCKET_NAME, strerror(errno));  
81.                 if (–tries == 0)  
82.                     break;  
83.             }  
84.             if (!done) {  
85.                 LOGE(“could not connect to %s socket (giving up): %s”,  
86.                     QEMUD_SOCKET_NAME, strerror(errno));  
87.                 while(1)  
88.                     sleep(0x00ffffff);  
89.             }  
90.         }  
91.   
92.         /* otherwise, try to see if we passed a device name from the kernel */  
93.         if (!done) do { //true  
94. #define  KERNEL_OPTION  “android.ril=”  
95. #define  DEV_PREFIX     “/dev/”  
96.             //判断/proc/cmdline中的内容是否包含”android.ril=”  
97.             p = strstr( buffer, KERNEL_OPTION );  
98.             if (p == NULL)  
99.                 break;  
100.             p += sizeof(KERNEL_OPTION)-1;  
101.             q  = strpbrk( p, ” \t\n\r” );  
102.             if (q != NULL)  
103.                 *q = 0;  
104.             snprintf( arg_device, sizeof(arg_device), DEV_PREFIX “%s”, p );  
105.             arg_device[sizeof(arg_device)-1] = 0;  
106.             arg_overrides[1] = “-d”;  
107.             arg_overrides[2] = arg_device;  
108.             done = 1;  
109.         } while (0);  
110.           
111.         if (done) { //false  
112.             argv = arg_overrides;  
113.             argc = 3;  
114.             i    = 1;  
115.             hasLibArgs = 1;  
116.             rilLibPath = REFERENCE_RIL_PATH;  
117.             LOGD(“overriding with %s %s”, arg_overrides[1], arg_overrides[2]);  
118.         }  
119.     }  
120. OpenLib:  
121. #endif  
122. ##################################################################################  
123.                             动态库装载  
124. ##################################################################################  
125.   
126. 　　switchUser();//设置Rild进程的组用户为radio  
127. 　　//加载厂商自定义的库  
128.     ①dlHandle = dlopen(rilLibPath, RTLD_NOW);  
129.     if (dlHandle == NULL) {  
130.         fprintf(stderr, “dlopen failed: %s\n”, dlerror());  
131.         exit(-1);  
132. 　　}  
133. 　　//<span style=”color: rgb(0, 128, 0); line-height: 1.5; font-family: ‘Courier New’; white-space: pre-wrap;”>创建客户端事件监听线程</span>  
134. 　　②RIL_startEventLoop();  
135. 　　//<span style=”color: rgb(0, 128, 0); line-height: 1.5; font-family: ‘Courier New’; white-space: pre-wrap;”>通过dlsym定位到RIL_Init函数的地址，并且强制转换为RIL_RadioFunctions的函数指针</span>  
136.     ③rilInit = (const RIL_RadioFunctions *(*)(const struct RIL_Env *, int, char **))dlsym(dlHandle, “RIL_Init”);  
137.     if (rilInit == NULL) {  
138.         fprintf(stderr, “RIL_Init not defined or exported in %s\n”, rilLibPath);  
139.         exit(-1);  
140.     }  
141.     if (hasLibArgs) { //false  
142.         rilArgv = argv + i – 1;  
143.         argc = argc -i + 1;  
144.     } else {  
145.         static char * newArgv[MAX_LIB_ARGS];  
146.         static char args[PROPERTY_VALUE_MAX];  
147.         rilArgv = newArgv;  
148.         property_get(LIB_ARGS_PROPERTY, args, “”);//通过属性系统读取”rild.libargs”属性值  
149.         argc = make_argv(args, rilArgv);  
150.     }  
151.     // Make sure there’s a reasonable argv[0]  
152. 　　rilArgv[0] = argv[0];  
153. 　　//调用RIL_Init函数来初始化rild，传入参数s_rilEnv，返回RIL_RadioFunctions地址  
154. 　　④funcs = rilInit(&s_rilEnv, argc, rilArgv);  
155. 　　//<span style=”color: rgb(0, 128, 0); line-height: 1.5; font-family: ‘Courier New’; white-space: pre-wrap;”>注册客户端事件处理接口</span><span style=”color: rgb(0, 128, 0); font-family: ‘Courier New’; line-height: 1.5; white-space: pre-wrap;”>RIL_RadioFunctions</span><span style=”color: rgb(0, 128, 0); line-height: 1.5; font-family: ‘Courier New’; white-space: pre-wrap;”>，并创建socket监听事件</span>  
156.     ⑤RIL_register(funcs);  
157. done:  
158.     while(1) {  
159.         // sleep(UINT32_MAX) seems to return immediately on bionic  
160.         sleep(0x00ffffff);  
161.     }  
162. }  

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1. int main(int argc, char **argv)  
2. {  
3.     const char * rilLibPath = NULL;  
4.     char **rilArgv;  
5.     void *dlHandle;  
6.     const RIL_RadioFunctions *(*rilInit)(const struct RIL_Env *, int, char **);  
7.     const RIL_RadioFunctions *funcs;  
8.     char libPath[PROPERTY_VALUE_MAX];  
9.     unsigned char hasLibArgs = 0;  
10.     int i;  
11. 　　umask(S_IRGRP | S_IWGRP | S_IXGRP | S_IROTH | S_IWOTH | S_IXOTH);  
12. 　　//rild启动无参数  
13.     for (i = 1; i < argc ;) {  
14.         if (0 == strcmp(argv[i], “-l”) && (argc – i > 1)) {  
15.             rilLibPath = argv[i + 1];  
16.             i += 2;  
17.         } else if (0 == strcmp(argv[i], “–“)) {  
18.             i++;  
19.             hasLibArgs = 1;  
20.             break;  
21.         } else {  
22.             usage(argv[0]);  
23.         }  
24.     }  
25. 　　if (rilLibPath == NULL) {  
26. 　　    //通过Android属性系统读取属性”rild.libpath”的值，即lib库的存放路径  
27.         if ( 0 == property_get(LIB_PATH_PROPERTY, libPath, NULL)) {  
28.             goto done;  
29.         } else {  
30.             rilLibPath = libPath;  
31.         }  
32. 　　}  
33. ##################################################################################  
34.                             判断是否为模拟器  
35. ##################################################################################  
36. #if 1  
37.     {  
38.         static char*  arg_overrides[3];  
39.         static char   arg_device[32];  
40.         int           done = 0;  
41. #define  REFERENCE_RIL_PATH  “/system/lib/libreference-ril.so”  
42.         /* first, read /proc/cmdline into memory */  
43.         char          buffer[1024], *p, *q;  
44.         int           len;  
45.         int           fd = open(“/proc/cmdline”,O_RDONLY);  
46.         if (fd < 0) {  
47.             LOGD(“could not open /proc/cmdline:%s”, strerror(errno));  
48.             goto OpenLib;  
49.         }  
50.         //读取/proc/cmdline文件中的内容  
51.         do {  
52.             len = read(fd,buffer,sizeof(buffer)); }  
53.         while (len == -1 && errno == EINTR);  
54.         if (len < 0) {  
55.             LOGD(“could not read /proc/cmdline:%s”, strerror(errno));  
56.             close(fd);  
57.             goto OpenLib;  
58.         }  
59.         close(fd);  
60.         //判断是否为模拟器，对于真机，此处条件为false  
61.         if (strstr(buffer, “android.qemud=”) != NULL)  
62.         {  
63.             int  tries = 5;  
64. #define  QEMUD_SOCKET_NAME    “qemud”  
65.             while (1) {  
66.                 int  fd;  
67.                 sleep(1);  
68.                 fd = socket_local_client(QEMUD_SOCKET_NAME,  
69.                             ANDROID_SOCKET_NAMESPACE_RESERVED,  
70.                             SOCK_STREAM );  
71.                 if (fd >= 0) {  
72.                     close(fd);  
73.                     snprintf( arg_device, sizeof(arg_device), “%s/%s”,  
74.                                 ANDROID_SOCKET_DIR, QEMUD_SOCKET_NAME );  
75.                     arg_overrides[1] = “-s”;  
76.                     arg_overrides[2] = arg_device;  
77.                     done = 1;  
78.                     break;  
79.                 }  
80.                 LOGD(“could not connect to %s socket: %s”,QEMUD_SOCKET_NAME, strerror(errno));  
81.                 if (–tries == 0)  
82.                     break;  
83.             }  
84.             if (!done) {  
85.                 LOGE(“could not connect to %s socket (giving up): %s”,  
86.                     QEMUD_SOCKET_NAME, strerror(errno));  
87.                 while(1)  
88.                     sleep(0x00ffffff);  
89.             }  
90.         }  
91.   
92.         /* otherwise, try to see if we passed a device name from the kernel */  
93.         if (!done) do { //true  
94. #define  KERNEL_OPTION  “android.ril=”  
95. #define  DEV_PREFIX     “/dev/”  
96.             //判断/proc/cmdline中的内容是否包含”android.ril=”  
97.             p = strstr( buffer, KERNEL_OPTION );  
98.             if (p == NULL)  
99.                 break;  
100.             p += sizeof(KERNEL_OPTION)-1;  
101.             q  = strpbrk( p, ” \t\n\r” );  
102.             if (q != NULL)  
103.                 *q = 0;  
104.             snprintf( arg_device, sizeof(arg_device), DEV_PREFIX “%s”, p );  
105.             arg_device[sizeof(arg_device)-1] = 0;  
106.             arg_overrides[1] = “-d”;  
107.             arg_overrides[2] = arg_device;  
108.             done = 1;  
109.         } while (0);  
110.           
111.         if (done) { //false  
112.             argv = arg_overrides;  
113.             argc = 3;  
114.             i    = 1;  
115.             hasLibArgs = 1;  
116.             rilLibPath = REFERENCE_RIL_PATH;  
117.             LOGD(“overriding with %s %s”, arg_overrides[1], arg_overrides[2]);  
118.         }  
119.     }  
120. OpenLib:  
121. #endif  
122. ##################################################################################  
123.                             动态库装载  
124. ##################################################################################  
125.   
126. 　　switchUser();//设置Rild进程的组用户为radio  
127. 　　//加载厂商自定义的库  
128.     ①dlHandle = dlopen(rilLibPath, RTLD_NOW);  
129.     if (dlHandle == NULL) {  
130.         fprintf(stderr, “dlopen failed: %s\n”, dlerror());  
131.         exit(-1);  
132. 　　}  
133. 　　//<span style=”font-family:’Courier New’;color:#080000;line-height: 1.5; white-space: pre-wrap;”>创建客户端事件监听线程</span>  
134. 　　②RIL_startEventLoop();  
135. 　　//<span style=”font-family:’Courier New’;color:#080000;line-height: 1.5; white-space: pre-wrap;”>通过dlsym定位到RIL_Init函数的地址，并且强制转换为RIL_RadioFunctions的函数指针</span>  
136.     ③rilInit = (const RIL_RadioFunctions *(*)(const struct RIL_Env *, int, char **))dlsym(dlHandle, “RIL_Init”);  
137.     if (rilInit == NULL) {  
138.         fprintf(stderr, “RIL_Init not defined or exported in %s\n”, rilLibPath);  
139.         exit(-1);  
140.     }  
141.     if (hasLibArgs) { //false  
142.         rilArgv = argv + i – 1;  
143.         argc = argc -i + 1;  
144.     } else {  
145.         static char * newArgv[MAX_LIB_ARGS];  
146.         static char args[PROPERTY_VALUE_MAX];  
147.         rilArgv = newArgv;  
148.         property_get(LIB_ARGS_PROPERTY, args, “”);//通过属性系统读取”rild.libargs”属性值  
149.         argc = make_argv(args, rilArgv);  
150.     }  
151.     // Make sure there’s a reasonable argv[0]  
152. 　　rilArgv[0] = argv[0];  
153. 　　//调用RIL_Init函数来初始化rild，传入参数s_rilEnv，返回RIL_RadioFunctions地址  
154. 　　④funcs = rilInit(&s_rilEnv, argc, rilArgv);  
155. 　　//<span style=”font-family:’Courier New’;color:#080000;line-height: 1.5; white-space: pre-wrap;”>注册客户端事件处理接口</span><span style=”font-family:’Courier New’;color:#080000;line-height: 1.5; white-space: pre-wrap;”>RIL_RadioFunctions</span><span style=”font-family:’Courier New’;color:#080000;line-height: 1.5; white-space: pre-wrap;”>，并创建socket监听事件</span>  
156.     ⑤RIL_register(funcs);  
157. done:  
158.     while(1) {  
159.         // sleep(UINT32_MAX) seems to return immediately on bionic  
160.         sleep(0x00ffffff);  
161.     }  
162. }  

在main函数中主要完成以下工作:

1.解析命令行参数，通过判断是否为模拟器采取不同的方式来读取libreference-ril.so库的存放路径；

2.使用dlopen手动装载libreference-ril.so库；

3.启动事件循环处理；

4.从libreference-ril.so库中取得RIL_Init函数地址，并使用该函数将libril.so库中的RIL_Env接口注册到libreference-ril.so库，同时将libreference-ril.so库中的RIL_RadioFunctions接口注册到到libril.so库中，建立起libril.so库与libreference-ril.so库通信桥梁；

启动事件循环处理eventLoop工作线程

建立多路I/O驱动机制的消息队列，用来接收上层发出的命令以及往Modem发送AT指令的工作，时整个RIL系统的核心部分。创建一个事件分发线程s_tid_dispatch，线程执行体为eventLoop。

hardware\ril\libril\Ril.cpp 

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1. extern “C” void RIL_startEventLoop(void) {  
2.     int ret;  
3.     pthread_attr_t attr;  
4.     /* spin up eventLoop thread and wait for it to get started */  
5.     s_started = 0;  
6.     pthread_mutex_lock(&s_startupMutex);  
7.     pthread_attr_init (&attr);  
8. 　　pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);  
9. 　　//创建一个工作线程eventLoop  
10. 　　ret = pthread_create(&s_tid_dispatch, &attr, eventLoop, NULL);  
11. 　　//确保函数返回前eventLoop线程启动运行  
12.     while (s_started == 0) {  
13.         pthread_cond_wait(&s_startupCond, &s_startupMutex);  
14.     }  
15.     pthread_mutex_unlock(&s_startupMutex);  
16.     if (ret < 0) {  
17.         LOGE(“Failed to create dispatch thread errno:%d”, errno);  
18.         return;  
19.     }  
20. }  

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1. extern “C” void RIL_startEventLoop(void) {  
2.     int ret;  
3.     pthread_attr_t attr;  
4.     /* spin up eventLoop thread and wait for it to get started */  
5.     s_started = 0;  
6.     pthread_mutex_lock(&s_startupMutex);  
7.     pthread_attr_init (&attr);  
8. 　　pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);  
9. 　　//创建一个工作线程eventLoop  
10. 　　ret = pthread_create(&s_tid_dispatch, &attr, eventLoop, NULL);  
11. 　　//确保函数返回前eventLoop线程启动运行  
12.     while (s_started == 0) {  
13.         pthread_cond_wait(&s_startupCond, &s_startupMutex);  
14.     }  
15.     pthread_mutex_unlock(&s_startupMutex);  
16.     if (ret < 0) {  
17.         LOGE(“Failed to create dispatch thread errno:%d”, errno);  
18.         return;  
19.     }  
20. }  

eventLoop执行时序图：

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1. static void * eventLoop(void *param) {  
2.     int ret;  
3.     int filedes[2];  
4.     ril_event_init(); //初始化请求队列  
5.     pthread_mutex_lock(&s_startupMutex);  
6.     s_started = 1; //eventLoop线程运行标志位  
7.     pthread_cond_broadcast(&s_startupCond);  
8. 　　pthread_mutex_unlock(&s_startupMutex);  
9. 　　//创建匿名管道  
10.     ret = pipe(filedes);  
11.     if (ret < 0) {  
12.         LOGE(“Error in pipe() errno:%d”, errno);  
13.         return NULL;  
14. 　　}  
15. 　　//s_fdWakeupRead为管道读端  
16. 　　s_fdWakeupRead = filedes[0];  
17. 　　//s_fdWakeupWrite为管道写端  
18. 　　s_fdWakeupWrite = filedes[1];  
19. 　　//设置管道读端为O_NONBLOCK非阻塞  
20. 　　fcntl(s_fdWakeupRead, F_SETFL, O_NONBLOCK);  
21. 　　//初始化s_wakeupfd_event结构体的内容，句柄为s_fdWakeupRead，回调函数为   processWakeupCallback  
22.     ril_event_set (&s_wakeupfd_event, s_fdWakeupRead, true,processWakeupCallback, NULL);  
23.     ①rilEventAddWakeup (&s_wakeupfd_event);  
24.     // Only returns on error  
25.     ②ril_event_loop();  
26.     LOGE (“error in event_loop_base errno:%d”, errno);  
27.     return NULL;  
28. }  

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1. static void * eventLoop(void *param) {  
2.     int ret;  
3.     int filedes[2];  
4.     ril_event_init(); //初始化请求队列  
5.     pthread_mutex_lock(&s_startupMutex);  
6.     s_started = 1; //eventLoop线程运行标志位  
7.     pthread_cond_broadcast(&s_startupCond);  
8. 　　pthread_mutex_unlock(&s_startupMutex);  
9. 　　//创建匿名管道  
10.     ret = pipe(filedes);  
11.     if (ret < 0) {  
12.         LOGE(“Error in pipe() errno:%d”, errno);  
13.         return NULL;  
14. 　　}  
15. 　　//s_fdWakeupRead为管道读端  
16. 　　s_fdWakeupRead = filedes[0];  
17. 　　//s_fdWakeupWrite为管道写端  
18. 　　s_fdWakeupWrite = filedes[1];  
19. 　　//设置管道读端为O_NONBLOCK非阻塞  
20. 　　fcntl(s_fdWakeupRead, F_SETFL, O_NONBLOCK);  
21. 　　//初始化s_wakeupfd_event结构体的内容，句柄为s_fdWakeupRead，回调函数为   processWakeupCallback  
22.     ril_event_set (&s_wakeupfd_event, s_fdWakeupRead, true,processWakeupCallback, NULL);  
23.     ①rilEventAddWakeup (&s_wakeupfd_event);  
24.     // Only returns on error  
25.     ②ril_event_loop();  
26.     LOGE (“error in event_loop_base errno:%d”, errno);  
27.     return NULL;  
28. }  

在rild中定义了event的概念，Rild
支持两种类型的事件：

1. 定时事件：根据事件的执行时间来启动执行，通过ril_timer_add添加到time_list队列中

2. Wakeup事件：这些事件的句柄fd将加入的select IO多路复用的句柄池readFDs中，当对应的fd可读时将触发这些事件。对于处于listen端的socket，fd可读表示有个客户端连接，此时需要调用accept接受连接。

事件定义如下：
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1. struct ril_event {  
2.     struct ril_event *next;  
3.     struct ril_event *prev;  
4.     int fd;  //文件句柄  
5.     int index; //该事件在监控表中的索引   
6.     bool persist; //如果是保持的，则不从watch_list 中删除  
7.     struct timeval timeout; //任务执行时间  
8.     ril_event_cb func; //回调事件处理函数  
9.     void *param; //回调时参数  
10. };  

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1. struct ril_event {  
2.     struct ril_event *next;  
3.     struct ril_event *prev;  
4.     int fd;  //文件句柄  
5.     int index; //该事件在监控表中的索引   
6.     bool persist; //如果是保持的，则不从watch_list 中删除  
7.     struct timeval timeout; //任务执行时间  
8.     ril_event_cb func; //回调事件处理函数  
9.     void *param; //回调时参数  
10. };  

在Rild进程中的几个重要事件有

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1. static struct ril_event s_commands_event;  
2. ril_event_set (&s_commands_event, s_fdCommand, 1,processCommandsCallback, p_rs)  
3.   
4. static struct ril_event s_wakeupfd_event;  
5. ril_event_set (&s_wakeupfd_event, s_fdWakeupRead, true,processWakeupCallback, NULL)  
6.   
7. static struct ril_event s_listen_event;  
8. ril_event_set (&s_listen_event, s_fdListen, false,listenCallback, NULL)  
9.   
10. static struct ril_event s_wake_timeout_event;  
11. ril_timer_add(&(p_info->event), &myRelativeTime)；  

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1. static struct ril_event s_commands_event;  
2. ril_event_set (&s_commands_event, s_fdCommand, 1,processCommandsCallback, p_rs)  
3.   
4. static struct ril_event s_wakeupfd_event;  
5. ril_event_set (&s_wakeupfd_event, s_fdWakeupRead, true,processWakeupCallback, NULL)  
6.   
7. static struct ril_event s_listen_event;  
8. ril_event_set (&s_listen_event, s_fdListen, false,listenCallback, NULL)  
9.   
10. static struct ril_event s_wake_timeout_event;  
11. ril_timer_add(&(p_info->event), &myRelativeTime)；  

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1. static struct ril_event s_debug_event;  
2. ril_event_set (&s_debug_event, s_fdDebug, true,debugCallback, NULL)  

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1. static struct ril_event s_debug_event;  
2. ril_event_set (&s_debug_event, s_fdDebug, true,debugCallback, NULL)  

在RILD中定义了三个事件队列，用于处理不同的事件：

/事件监控队列

static struct ril_event * watch_table[MAX_FD_EVENTS];

//定时事件队列

static struct ril_event timer_list;

//处理事件队列

static struct ril_event pending_list; //待处理事件队列，事件已经触发，需要所回调处理的事件

添加事件

1.添加
Wakeup 事件
 
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1. static void rilEventAddWakeup(struct ril_event *ev) {  
2.     ril_event_add(ev); //向监控表watch_table添加一个s_wakeupfd_event事件  
3.     triggerEvLoop(); //向管道s_fdWakeupWrite中写入之来触发事件循环  
4. }  

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1. static void rilEventAddWakeup(struct ril_event *ev) {  
2.     ril_event_add(ev); //向监控表watch_table添加一个s_wakeupfd_event事件  
3.     triggerEvLoop(); //向管道s_fdWakeupWrite中写入之来触发事件循环  
4. }  

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1. void ril_event_add(struct ril_event * ev)  
2. {  
3.     dlog(“~~~~ +ril_event_add ~~~~”);  
4.     MUTEX_ACQUIRE();  
5.     for (int i = 0; i < MAX_FD_EVENTS; i++) { //遍历监控表watch_table  
6.         if (watch_table[i] == NULL) { //从监控表中查找空闲的索引，然后把该任务加入到监控表中  
7.             watch_table[i] = ev; //向监控表中添加事件  
8.             ev->index = i; //事件的索引设置为在监控表中的索引  
9.             dlog(“~~~~ added at %d ~~~~”, i);  
10.             dump_event(ev);  
11.             FD_SET(ev->fd, &readFds); //将添加的事件对应的句柄添加到句柄池readFds中  
12.             if (ev->fd >= nfds) nfds = ev->fd+1; //修改句柄最大值  
13.             dlog(“~~~~ nfds = %d ~~~~”, nfds);  
14.             break;  
15.         }  
16.     }  
17.     MUTEX_RELEASE();  
18.     dlog(“~~~~ -ril_event_add ~~~~”);  
19. }  

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1. void ril_event_add(struct ril_event * ev)  
2. {  
3.     dlog(“~~~~ +ril_event_add ~~~~”);  
4.     MUTEX_ACQUIRE();  
5.     for (int i = 0; i < MAX_FD_EVENTS; i++) { //遍历监控表watch_table  
6.         if (watch_table[i] == NULL) { //从监控表中查找空闲的索引，然后把该任务加入到监控表中  
7.             watch_table[i] = ev; //向监控表中添加事件  
8.             ev->index = i; //事件的索引设置为在监控表中的索引  
9.             dlog(“~~~~ added at %d ~~~~”, i);  
10.             dump_event(ev);  
11.             FD_SET(ev->fd, &readFds); //将添加的事件对应的句柄添加到句柄池readFds中  
12.             if (ev->fd >= nfds) nfds = ev->fd+1; //修改句柄最大值  
13.             dlog(“~~~~ nfds = %d ~~~~”, nfds);  
14.             break;  
15.         }  
16.     }  
17.     MUTEX_RELEASE();  
18.     dlog(“~~~~ -ril_event_add ~~~~”);  
19. }  

2.添加定时事件

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1. void ril_timer_add(struct ril_event * ev, struct timeval * tv)  
2. {  
3.     dlog(“~~~~ +ril_timer_add ~~~~”);  
4.     MUTEX_ACQUIRE();  
5.     struct ril_event * list;  
6.     if (tv != NULL) {  
7.         list = timer_list.next;  
8.         ev->fd = -1; // make sure fd is invalid  
9.         struct timeval now;  
10.         getNow(&now);  
11.         timeradd(&now, tv, &ev->timeout);  
12.         // keep list sorted  
13.         while (timercmp(&list->timeout, &ev->timeout, < ) && (list != &timer_list)) {  
14.             list = list->next;  
15.         }  
16.         // list now points to the first event older than ev  
17.         addToList(ev, list);  
18.     }  
19.     MUTEX_RELEASE();  
20.     dlog(“~~~~ -ril_timer_add ~~~~”);  
21. }  

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1. void ril_timer_add(struct ril_event * ev, struct timeval * tv)  
2. {  
3.     dlog(“~~~~ +ril_timer_add ~~~~”);  
4.     MUTEX_ACQUIRE();  
5.     struct ril_event * list;  
6.     if (tv != NULL) {  
7.         list = timer_list.next;  
8.         ev->fd = -1; // make sure fd is invalid  
9.         struct timeval now;  
10.         getNow(&now);  
11.         timeradd(&now, tv, &ev->timeout);  
12.         // keep list sorted  
13.         while (timercmp(&list->timeout, &ev->timeout, < ) && (list != &timer_list)) {  
14.             list = list->next;  
15.         }  
16.         // list now points to the first event older than ev  
17.         addToList(ev, list);  
18.     }  
19.     MUTEX_RELEASE();  
20.     dlog(“~~~~ -ril_timer_add ~~~~”);  
21. }  

触发事件

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1. static void triggerEvLoop() {  
2.     int ret;  
3. 　　if (!pthread_equal(pthread_self(), s_tid_dispatch)) { //如果当前线程ID不等于事件分发线程eventLoop的线程ID  
4.       do {  
5.             ret = write (s_fdWakeupWrite, ” “, 1); //向管道写端写入值1来触发eventLoop事件循环  
6.          } while (ret < 0 && errno == EINTR);  
7.     }  
8. }  

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1. static void triggerEvLoop() {  
2.     int ret;  
3. 　　if (!pthread_equal(pthread_self(), s_tid_dispatch)) { //如果当前线程ID不等于事件分发线程eventLoop的线程ID  
4.       do {  
5.             ret = write (s_fdWakeupWrite, ” “, 1); //向管道写端写入值1来触发eventLoop事件循环  
6.          } while (ret < 0 && errno == EINTR);  
7.     }  
8. }  

处理事件

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1. void ril_event_loop()  
2. {  
3.     int n;  
4.     fd_set rfds;  
5.     struct timeval tv;  
6.     struct timeval * ptv;  
7.     for (;;) {  
8.         memcpy(&rfds, &readFds, sizeof(fd_set));  
9.         if (-1 == calcNextTimeout(&tv)) {  
10.             dlog(“~~~~ no timers; blocking indefinitely ~~~~”);  
11.             ptv = NULL;  
12.         } else {  
13.             dlog(“~~~~ blocking for %ds + %dus ~~~~”, (int)tv.tv_sec, (int)tv.tv_usec);  
14.             ptv = &tv;  
15.         }  
16.         //使用select 函数等待在FDS 上,只要FDS 中记录的设备有数据到来，select 就会设置相应的标志位并返回。readFDS 记录了所有的事件相关设备句柄。readFDS 中句柄是在在AddEvent 加入的。  
17.         printReadies(&rfds);  
18.         n = select(nfds, &rfds, NULL, NULL, ptv);   
19.         printReadies(&rfds);  
20.         dlog(“~~~~ %d events fired ~~~~”, n);  
21.         if (n < 0) {  
22.             if (errno == EINTR) continue;  
23.             LOGE(“ril_event: select error (%d)”, errno);  
24.             return;  
25.         }  
26.         processTimeouts(); //从timer_list中查询执行时间已到的事件，并添加到pending_list中  
27.         processReadReadies(&rfds, n); //从watch_table中查询数据可读的事件，并添加到pending_list中去处理，如果该事件不是持久事件，则同时从watch_table中删除  
28.         //遍历pending_list，调用事件处理回调函数处理所有事件  
29.         firePending();  
30.     }  
31. }  

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1. void ril_event_loop()  
2. {  
3.     int n;  
4.     fd_set rfds;  
5.     struct timeval tv;  
6.     struct timeval * ptv;  
7.     for (;;) {  
8.         memcpy(&rfds, &readFds, sizeof(fd_set));  
9.         if (-1 == calcNextTimeout(&tv)) {  
10.             dlog(“~~~~ no timers; blocking indefinitely ~~~~”);  
11.             ptv = NULL;  
12.         } else {  
13.             dlog(“~~~~ blocking for %ds + %dus ~~~~”, (int)tv.tv_sec, (int)tv.tv_usec);  
14.             ptv = &tv;  
15.         }  
16.         //使用select 函数等待在FDS 上,只要FDS 中记录的设备有数据到来，select 就会设置相应的标志位并返回。readFDS 记录了所有的事件相关设备句柄。readFDS 中句柄是在在AddEvent 加入的。  
17.         printReadies(&rfds);  
18.         n = select(nfds, &rfds, NULL, NULL, ptv);   
19.         printReadies(&rfds);  
20.         dlog(“~~~~ %d events fired ~~~~”, n);  
21.         if (n < 0) {  
22.             if (errno == EINTR) continue;  
23.             LOGE(“ril_event: select error (%d)”, errno);  
24.             return;  
25.         }  
26.         processTimeouts(); //从timer_list中查询执行时间已到的事件，并添加到pending_list中  
27.         processReadReadies(&rfds, n); //从watch_table中查询数据可读的事件，并添加到pending_list中去处理，如果该事件不是持久事件，则同时从watch_table中删除  
28.         //遍历pending_list，调用事件处理回调函数处理所有事件  
29.         firePending();  
30.     }  
31. }  

在eventLoop工作线程中，循环处理到来的事件及定时结束事件，整个处理流程如下图所示：

首先通过Linux中的select多路I/O复用对句柄池中的所有句柄进行监控，当有事件到来时select返回，否则阻塞。当select返回时，表示有事件的到来，通过调用processTimeouts函数来处理超时事件，处理方式是遍历time_list链表以查询超时事件，并将超时事件移入到pending_list链表中，接着调用processReadReadies函数来处理触发的事件，处理方式为遍历watch_table列表以查询触发的事件，并将触发的事件移入到pending_list链表中，如果该事件不是持久事件，还需要从watch_table列表中移除，当查询完两种待处理的事件并放入到pending_list链表中后，调用firePending函数对待处理的事件进行集中处理，处理方式为遍历链表，调用每一个事件的回调函数。

 1.超时事件查询

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1. static void processTimeouts()  
2. {  
3.     dlog(“~~~~ +processTimeouts ~~~~”);  
4.     MUTEX_ACQUIRE();  
5.     struct timeval now;  
6.     struct ril_event * tev = timer_list.next;  
7.     struct ril_event * next;  
8.     getNow(&now); //获取当前时间  
9. 　　dlog(“~~~~ Looking for timers <= %ds + %dus ~~~~”, (int)now.tv_sec, (int)now.tv_usec);  
10. 　　//如果当前时间大于事件的超时时间，则将该事件从timer_list中移除，添加到pending_list  
11.     while ((tev != &timer_list) && (timercmp(&now, &tev->timeout, >))) {  
12.         dlog(“~~~~ firing timer ~~~~”);  
13.         next = tev->next;  
14.         removeFromList(tev); //从timer_list中移除事件  
15.         addToList(tev, &pending_list); //将事件添加到pending_list  
16.         tev = next;  
17.     }  
18.     MUTEX_RELEASE();  
19.     dlog(“~~~~ -processTimeouts ~~~~”);  
20. }  

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1. static void processTimeouts()  
2. {  
3.     dlog(“~~~~ +processTimeouts ~~~~”);  
4.     MUTEX_ACQUIRE();  
5.     struct timeval now;  
6.     struct ril_event * tev = timer_list.next;  
7.     struct ril_event * next;  
8.     getNow(&now); //获取当前时间  
9. 　　dlog(“~~~~ Looking for timers <= %ds + %dus ~~~~”, (int)now.tv_sec, (int)now.tv_usec);  
10. 　　//如果当前时间大于事件的超时时间，则将该事件从timer_list中移除，添加到pending_list  
11.     while ((tev != &timer_list) && (timercmp(&now, &tev->timeout, >))) {  
12.         dlog(“~~~~ firing timer ~~~~”);  
13.         next = tev->next;  
14.         removeFromList(tev); //从timer_list中移除事件  
15.         addToList(tev, &pending_list); //将事件添加到pending_list  
16.         tev = next;  
17.     }  
18.     MUTEX_RELEASE();  
19.     dlog(“~~~~ -processTimeouts ~~~~”);  
20. }  

2.可读事件查询

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1. static void processReadReadies(fd_set * rfds, int n)  
2. {  
3.     dlog(“~~~~ +processReadReadies (%d) ~~~~”, n);  
4. 　　MUTEX_ACQUIRE();   
5. 　　//遍历watch_table数组，根据select返回的句柄n查找对应的事件  
6.     for (int i = 0; (i < MAX_FD_EVENTS) && (n > 0); i++) {  
7.         struct ril_event * rev = watch_table[i]; //得到相应的事件  
8.         if (rev != NULL && FD_ISSET(rev->fd, rfds)) {  
9.             addToList(rev, &pending_list); //将该事件添加到pending_list中  
10.             if (rev->persist == false) { //如果该事件不是持久事件还要从watch_table中移除  
11.                 removeWatch(rev, i);  
12.             }  
13.             n–;  
14.         }  
15.     }  
16.     MUTEX_RELEASE();  
17.     dlog(“~~~~ -processReadReadies (%d) ~~~~”, n);  
18. }  

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1. static void processReadReadies(fd_set * rfds, int n)  
2. {  
3.     dlog(“~~~~ +processReadReadies (%d) ~~~~”, n);  
4. 　　MUTEX_ACQUIRE();   
5. 　　//遍历watch_table数组，根据select返回的句柄n查找对应的事件  
6.     for (int i = 0; (i < MAX_FD_EVENTS) && (n > 0); i++) {  
7.         struct ril_event * rev = watch_table[i]; //得到相应的事件  
8.         if (rev != NULL && FD_ISSET(rev->fd, rfds)) {  
9.             addToList(rev, &pending_list); //将该事件添加到pending_list中  
10.             if (rev->persist == false) { //如果该事件不是持久事件还要从watch_table中移除  
11.                 removeWatch(rev, i);  
12.             }  
13.             n–;  
14.         }  
15.     }  
16.     MUTEX_RELEASE();  
17.     dlog(“~~~~ -processReadReadies (%d) ~~~~”, n);  
18. }  

3.事件处理

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1. static void firePending()  
2. {  
3.     dlog(“~~~~ +firePending ~~~~”);  
4.     struct ril_event * ev = pending_list.next;  
5.     while (ev != &pending_list) { //遍历pending_list链表，处理链表中的所有事件  
6.         struct ril_event * next = ev->next;  
7.         removeFromList(ev); //将处理完的事件从pending_list中移除  
8.         ev->func(ev->fd, 0, ev->param); //调用事件处理的回调函数  
9.         ev = next;  
10.     }  
11.     dlog(“~~~~ -firePending ~~~~”);  
12. }  

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1. static void firePending()  
2. {  
3.     dlog(“~~~~ +firePending ~~~~”);  
4.     struct ril_event * ev = pending_list.next;  
5.     while (ev != &pending_list) { //遍历pending_list链表，处理链表中的所有事件  
6.         struct ril_event * next = ev->next;  
7.         removeFromList(ev); //将处理完的事件从pending_list中移除  
8.         ev->func(ev->fd, 0, ev->param); //调用事件处理的回调函数  
9.         ev = next;  
10.     }  
11.     dlog(“~~~~ -firePending ~~~~”);  
12. }  

RIL_Env定义

hardware\ril\include\telephony\ril.h

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1. struct RIL_Env {  
2.     //动态库完成请求后通知处理结果的接口  
3. 　　void (*OnRequestComplete)(RIL_Token t, RIL_Errno e,void *response, size_t responselen);  
4.     //动态库unSolicited Response通知接口  
5. 　　void (*OnUnsolicitedResponse)(int unsolResponse, const void *data,size_t datalen);  
6.     //向Rild提交一个超时任务的接口  
7.     void (*RequestTimedCallback) (RIL_TimedCallback callback,void *param, const struct timeval *relativeTime);  
8. };  

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1. struct RIL_Env {  
2.     //动态库完成请求后通知处理结果的接口  
3. 　　void (*OnRequestComplete)(RIL_Token t, RIL_Errno e,void *response, size_t responselen);  
4.     //动态库unSolicited Response通知接口  
5. 　　void (*OnUnsolicitedResponse)(int unsolResponse, const void *data,size_t datalen);  
6.     //向Rild提交一个超时任务的接口  
7.     void (*RequestTimedCallback) (RIL_TimedCallback callback,void *param, const struct timeval *relativeTime);  
8. };  

hardware\ril\rild\rild.c

s_rilEnv变量定义：

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1. static struct RIL_Env s_rilEnv = {  
2.     RIL_onRequestComplete,  
3.     RIL_onUnsolicitedResponse,  
4.     RIL_requestTimedCallback  
5. };  

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1. static struct RIL_Env s_rilEnv = {  
2.     RIL_onRequestComplete,  
3.     RIL_onUnsolicitedResponse,  
4.     RIL_requestTimedCallback  
5. };  

在hardware\ril\libril\ril.cpp中实现了RIL_Env的各个接口函数

1.RIL_onRequestComplete

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1. extern “C” void RIL_onRequestComplete(RIL_Token t, RIL_Errno e, void *response, size_t responselen) {  
2.     RequestInfo *pRI;  
3.     int ret;  
4.     size_t errorOffset;  
5.     pRI = (RequestInfo *)t;  
6.     if (!checkAndDequeueRequestInfo(pRI)) {  
7.         LOGE (“RIL_onRequestComplete: invalid RIL_Token”);  
8.         return;  
9.     }  
10.     if (pRI->local > 0) {  
11.         // Locally issued command…void only!  
12.         // response does not go back up the command socket  
13.         LOGD(“C[locl]< %s”, requestToString(pRI->pCI->requestNumber));  
14.         goto done;  
15.     }  
16.     appendPrintBuf(“[%04d]< %s”,pRI->token, requestToString(pRI->pCI->requestNumber));  
17.     if (pRI->cancelled == 0) {  
18.         Parcel p;  
19.         p.writeInt32 (RESPONSE_SOLICITED);  
20.         p.writeInt32 (pRI->token);  
21.         errorOffset = p.dataPosition();  
22.         p.writeInt32 (e);  
23.         if (response != NULL) {  
24.             // there is a response payload, no matter success or not.  
25.             ret = pRI->pCI->responseFunction(p, response, responselen);  
26.             /* if an error occurred, rewind and mark it */  
27.             if (ret != 0) {  
28.                 p.setDataPosition(errorOffset);  
29.                 p.writeInt32 (ret);  
30.             }  
31.         }  
32.         if (e != RIL_E_SUCCESS) {  
33.             appendPrintBuf(“%s fails by %s”, printBuf, failCauseToString(e));  
34.         }  
35.         if (s_fdCommand < 0) {  
36.             LOGD (“RIL onRequestComplete: Command channel closed”);  
37.         }  
38.         sendResponse(p);  
39.     }  
40. done:  
41.     free(pRI);  
42. }  

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1. extern “C” void RIL_onRequestComplete(RIL_Token t, RIL_Errno e, void *response, size_t responselen) {  
2.     RequestInfo *pRI;  
3.     int ret;  
4.     size_t errorOffset;  
5.     pRI = (RequestInfo *)t;  
6.     if (!checkAndDequeueRequestInfo(pRI)) {  
7.         LOGE (“RIL_onRequestComplete: invalid RIL_Token”);  
8.         return;  
9.     }  
10.     if (pRI->local > 0) {  
11.         // Locally issued command…void only!  
12.         // response does not go back up the command socket  
13.         LOGD(“C[locl]< %s”, requestToString(pRI->pCI->requestNumber));  
14.         goto done;  
15.     }  
16.     appendPrintBuf(“[%04d]< %s”,pRI->token, requestToString(pRI->pCI->requestNumber));  
17.     if (pRI->cancelled == 0) {  
18.         Parcel p;  
19.         p.writeInt32 (RESPONSE_SOLICITED);  
20.         p.writeInt32 (pRI->token);  
21.         errorOffset = p.dataPosition();  
22.         p.writeInt32 (e);  
23.         if (response != NULL) {  
24.             // there is a response payload, no matter success or not.  
25.             ret = pRI->pCI->responseFunction(p, response, responselen);  
26.             /* if an error occurred, rewind and mark it */  
27.             if (ret != 0) {  
28.                 p.setDataPosition(errorOffset);  
29.                 p.writeInt32 (ret);  
30.             }  
31.         }  
32.         if (e != RIL_E_SUCCESS) {  
33.             appendPrintBuf(“%s fails by %s”, printBuf, failCauseToString(e));  
34.         }  
35.         if (s_fdCommand < 0) {  
36.             LOGD (“RIL onRequestComplete: Command channel closed”);  
37.         }  
38.         sendResponse(p);  
39.     }  
40. done:  
41.     free(pRI);  
42. }  

通过调用responseXXX将底层响应传给客户进程

2.RIL_onUnsolicitedResponse

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1. extern “C” void RIL_onUnsolicitedResponse(int unsolResponse, void *data,  
2.                                 size_t datalen)  
3. {  
4.     int unsolResponseIndex;  
5.     int ret;  
6.     int64_t timeReceived = 0;  
7.     bool shouldScheduleTimeout = false;  
8.     if (s_registerCalled == 0) {  
9.         // Ignore RIL_onUnsolicitedResponse before RIL_register  
10.         LOGW(“RIL_onUnsolicitedResponse called before RIL_register”);  
11.         return;  
12.     }  
13.     unsolResponseIndex = unsolResponse – RIL_UNSOL_RESPONSE_BASE;  
14.     if ((unsolResponseIndex < 0)  
15.         || (unsolResponseIndex >= (int32_t)NUM_ELEMS(s_unsolResponses))) {  
16.         LOGE(“unsupported unsolicited response code %d”, unsolResponse);  
17.         return;  
18.     }  
19.     // Grab a wake lock if needed for this reponse,  
20.     // as we exit we’ll either release it immediately  
21.     // or set a timer to release it later.  
22.     switch (s_unsolResponses[unsolResponseIndex].wakeType) {  
23.         case WAKE_PARTIAL:  
24.             grabPartialWakeLock();  
25.             shouldScheduleTimeout = true;  
26.         break;  
27.         case DONT_WAKE:  
28.         default:  
29.             // No wake lock is grabed so don’t set timeout  
30.             shouldScheduleTimeout = false;  
31.             break;  
32.     }  
33.     // Mark the time this was received, doing this  
34.     // after grabing the wakelock incase getting  
35.     // the elapsedRealTime might cause us to goto  
36.     // sleep.  
37.     if (unsolResponse == RIL_UNSOL_NITZ_TIME_RECEIVED) {  
38.         timeReceived = elapsedRealtime();  
39.     }  
40.     appendPrintBuf(“[UNSL]< %s”, requestToString(unsolResponse));  
41.     Parcel p;  
42.     p.writeInt32 (RESPONSE_UNSOLICITED);  
43.     p.writeInt32 (unsolResponse);  
44.     ret = s_unsolResponses[unsolResponseIndex].responseFunction(p, data, datalen);  
45.     if (ret != 0) {  
46.         // Problem with the response. Don’t continue;  
47.         goto error_exit;  
48.     }  
49.     // some things get more payload  
50.     switch(unsolResponse) {  
51.         case RIL_UNSOL_RESPONSE_RADIO_STATE_CHANGED:  
52.             p.writeInt32(s_callbacks.onStateRequest());  
53.             appendPrintBuf(“%s {%s}”, printBuf,  
54.                 radioStateToString(s_callbacks.onStateRequest()));  
55.         break;  
56.         case RIL_UNSOL_NITZ_TIME_RECEIVED:  
57.             // Store the time that this was received so the  
58.             // handler of this message can account for  
59.             // the time it takes to arrive and process. In  
60.             // particular the system has been known to sleep  
61.             // before this message can be processed.  
62.             p.writeInt64(timeReceived);  
63.         break;  
64.     }  
65.     ret = sendResponse(p);  
66.     if (ret != 0 && unsolResponse == RIL_UNSOL_NITZ_TIME_RECEIVED) {  
67.         // Unfortunately, NITZ time is not poll/update like everything  
68.         // else in the system. So, if the upstream client isn’t connected,  
69.         // keep a copy of the last NITZ response (with receive time noted  
70.         // above) around so we can deliver it when it is connected  
71.         if (s_lastNITZTimeData != NULL) {  
72.             free (s_lastNITZTimeData);  
73.             s_lastNITZTimeData = NULL;  
74.         }  
75.         s_lastNITZTimeData = malloc(p.dataSize());  
76.         s_lastNITZTimeDataSize = p.dataSize();  
77.         memcpy(s_lastNITZTimeData, p.data(), p.dataSize());  
78.     }  
79.     // For now, we automatically go back to sleep after TIMEVAL_WAKE_TIMEOUT  
80.     // FIXME The java code should handshake here to release wake lock  
81.     if (shouldScheduleTimeout) {  
82.         // Cancel the previous request  
83.         if (s_last_wake_timeout_info != NULL) {  
84.             s_last_wake_timeout_info->userParam = (void *)1;  
85.         }  
86.         s_last_wake_timeout_info= internalRequestTimedCallback(wakeTimeoutCallback, NULL,  
87.                                             &TIMEVAL_WAKE_TIMEOUT);  
88.     }  
89.     return;  
90. error_exit:  
91.     if (shouldScheduleTimeout) {  
92.         releaseWakeLock();  
93.     }  
94. }  

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1. extern “C” void RIL_onUnsolicitedResponse(int unsolResponse, void *data,  
2.                                 size_t datalen)  
3. {  
4.     int unsolResponseIndex;  
5.     int ret;  
6.     int64_t timeReceived = 0;  
7.     bool shouldScheduleTimeout = false;  
8.     if (s_registerCalled == 0) {  
9.         // Ignore RIL_onUnsolicitedResponse before RIL_register  
10.         LOGW(“RIL_onUnsolicitedResponse called before RIL_register”);  
11.         return;  
12.     }  
13.     unsolResponseIndex = unsolResponse – RIL_UNSOL_RESPONSE_BASE;  
14.     if ((unsolResponseIndex < 0)  
15.         || (unsolResponseIndex >= (int32_t)NUM_ELEMS(s_unsolResponses))) {  
16.         LOGE(“unsupported unsolicited response code %d”, unsolResponse);  
17.         return;  
18.     }  
19.     // Grab a wake lock if needed for this reponse,  
20.     // as we exit we’ll either release it immediately  
21.     // or set a timer to release it later.  
22.     switch (s_unsolResponses[unsolResponseIndex].wakeType) {  
23.         case WAKE_PARTIAL:  
24.             grabPartialWakeLock();  
25.             shouldScheduleTimeout = true;  
26.         break;  
27.         case DONT_WAKE:  
28.         default:  
29.             // No wake lock is grabed so don’t set timeout  
30.             shouldScheduleTimeout = false;  
31.             break;  
32.     }  
33.     // Mark the time this was received, doing this  
34.     // after grabing the wakelock incase getting  
35.     // the elapsedRealTime might cause us to goto  
36.     // sleep.  
37.     if (unsolResponse == RIL_UNSOL_NITZ_TIME_RECEIVED) {  
38.         timeReceived = elapsedRealtime();  
39.     }  
40.     appendPrintBuf(“[UNSL]< %s”, requestToString(unsolResponse));  
41.     Parcel p;  
42.     p.writeInt32 (RESPONSE_UNSOLICITED);  
43.     p.writeInt32 (unsolResponse);  
44.     ret = s_unsolResponses[unsolResponseIndex].responseFunction(p, data, datalen);  
45.     if (ret != 0) {  
46.         // Problem with the response. Don’t continue;  
47.         goto error_exit;  
48.     }  
49.     // some things get more payload  
50.     switch(unsolResponse) {  
51.         case RIL_UNSOL_RESPONSE_RADIO_STATE_CHANGED:  
52.             p.writeInt32(s_callbacks.onStateRequest());  
53.             appendPrintBuf(“%s {%s}”, printBuf,  
54.                 radioStateToString(s_callbacks.onStateRequest()));  
55.         break;  
56.         case RIL_UNSOL_NITZ_TIME_RECEIVED:  
57.             // Store the time that this was received so the  
58.             // handler of this message can account for  
59.             // the time it takes to arrive and process. In  
60.             // particular the system has been known to sleep  
61.             // before this message can be processed.  
62.             p.writeInt64(timeReceived);  
63.         break;  
64.     }  
65.     ret = sendResponse(p);  
66.     if (ret != 0 && unsolResponse == RIL_UNSOL_NITZ_TIME_RECEIVED) {  
67.         // Unfortunately, NITZ time is not poll/update like everything  
68.         // else in the system. So, if the upstream client isn’t connected,  
69.         // keep a copy of the last NITZ response (with receive time noted  
70.         // above) around so we can deliver it when it is connected  
71.         if (s_lastNITZTimeData != NULL) {  
72.             free (s_lastNITZTimeData);  
73.             s_lastNITZTimeData = NULL;  
74.         }  
75.         s_lastNITZTimeData = malloc(p.dataSize());  
76.         s_lastNITZTimeDataSize = p.dataSize();  
77.         memcpy(s_lastNITZTimeData, p.data(), p.dataSize());  
78.     }  
79.     // For now, we automatically go back to sleep after TIMEVAL_WAKE_TIMEOUT  
80.     // FIXME The java code should handshake here to release wake lock  
81.     if (shouldScheduleTimeout) {  
82.         // Cancel the previous request  
83.         if (s_last_wake_timeout_info != NULL) {  
84.             s_last_wake_timeout_info->userParam = (void *)1;  
85.         }  
86.         s_last_wake_timeout_info= internalRequestTimedCallback(wakeTimeoutCallback, NULL,  
87.                                             &TIMEVAL_WAKE_TIMEOUT);  
88.     }  
89.     return;  
90. error_exit:  
91.     if (shouldScheduleTimeout) {  
92.         releaseWakeLock();  
93.     }  
94. }  

这个函数处理modem从网络端接收到的各种事件，如网络信号变化，拨入的电话，收到短信等。然后传给客户进程。

3.RIL_requestTimedCallback

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1. extern “C” void RIL_requestTimedCallback (RIL_TimedCallback callback, void *param,  
2.                                 const struct timeval *relativeTime) {  
3.     internalRequestTimedCallback (callback, param, relativeTime);  
4. }  

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1. extern “C” void RIL_requestTimedCallback (RIL_TimedCallback callback, void *param,  
2.                                 const struct timeval *relativeTime) {  
3.     internalRequestTimedCallback (callback, param, relativeTime);  
4. }  

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1. static UserCallbackInfo *internalRequestTimedCallback (RIL_TimedCallback callback, void *param,  
2.                                 const struct timeval *relativeTime)  
3. {  
4.     struct timeval myRelativeTime;  
5.     UserCallbackInfo *p_info;  
6.     p_info = (UserCallbackInfo *) malloc (sizeof(UserCallbackInfo));  
7.     p_info->p_callback = callback;  
8.     p_info->userParam = param;  
9.     if (relativeTime == NULL) {  
10.         /* treat null parameter as a 0 relative time */  
11.         memset (&myRelativeTime, 0, sizeof(myRelativeTime));  
12.     } else {  
13.         /* FIXME I think event_add’s tv param is really const anyway */  
14.         memcpy (&myRelativeTime, relativeTime, sizeof(myRelativeTime));  
15.     }  
16.     ril_event_set(&(p_info->event), -1, false, userTimerCallback, p_info);  
17.     ril_timer_add(&(p_info->event), &myRelativeTime);  
18.     triggerEvLoop();  
19.     return p_info;  
20. }  

[cpp] 
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1. static UserCallbackInfo *internalRequestTimedCallback (RIL_TimedCallback callback, void *param,  
2.                                 const struct timeval *relativeTime)  
3. {  
4.     struct timeval myRelativeTime;  
5.     UserCallbackInfo *p_info;  
6.     p_info = (UserCallbackInfo *) malloc (sizeof(UserCallbackInfo));  
7.     p_info->p_callback = callback;  
8.     p_info->userParam = param;  
9.     if (relativeTime == NULL) {  
10.         /* treat null parameter as a 0 relative time */  
11.         memset (&myRelativeTime, 0, sizeof(myRelativeTime));  
12.     } else {  
13.         /* FIXME I think event_add’s tv param is really const anyway */  
14.         memcpy (&myRelativeTime, relativeTime, sizeof(myRelativeTime));  
15.     }  
16.     ril_event_set(&(p_info->event), -1, false, userTimerCallback, p_info);  
17.     ril_timer_add(&(p_info->event), &myRelativeTime);  
18.     triggerEvLoop();  
19.     return p_info;  
20. }  

RIL_RadioFunctions定义

客户端向Rild发送请求的接口，由各手机厂商实现。

hardware\ril\include\telephony\Ril.h 

[cpp] 
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1. typedef struct {  
2.     int version; //Rild版本  
3.     RIL_RequestFunc onRequest; //AP请求接口  
4.     RIL_RadioStateRequest onStateRequest;//BP状态查询  
5.     RIL_Supports supports;  
6.     RIL_Cancel onCancel;  
7.     RIL_GetVersion getVersion;//动态库版本  
8. } RIL_RadioFunctions;  

[cpp] 
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1. typedef struct {  
2.     int version; //Rild版本  
3.     RIL_RequestFunc onRequest; //AP请求接口  
4.     RIL_RadioStateRequest onStateRequest;//BP状态查询  
5.     RIL_Supports supports;  
6.     RIL_Cancel onCancel;  
7.     RIL_GetVersion getVersion;//动态库版本  
8. } RIL_RadioFunctions;  

变量定义：
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1. static const RIL_RadioFunctions s_callbacks = {  
2.     RIL_VERSION,  
3.     onRequest,  
4.     currentState,  
5.     onSupports,  
6.     onCancel,  
7.     getVersion  
8. };  

[cpp] 
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1. static const RIL_RadioFunctions s_callbacks = {  
2.     RIL_VERSION,  
3.     onRequest,  
4.     currentState,  
5.     onSupports,  
6.     onCancel,  
7.     getVersion  
8. };  

在hardware\ril\reference-ril\reference-ril.c中实现了RIL_RadioFunctions的各个接口函数

1.onRequest

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1. static void onRequest (int request, void *data, size_t datalen, RIL_Token t)  
2. {  
3.     ATResponse *p_response;  
4.     int err;  
5.     LOGD(“onRequest: %s”, requestToString(request));  
6.     /* Ignore all requests except RIL_REQUEST_GET_SIM_STATUS 
7.      * when RADIO_STATE_UNAVAILABLE. 
8.      */  
9.     if (sState == RADIO_STATE_UNAVAILABLE  
10.         && request != RIL_REQUEST_GET_SIM_STATUS  
11.     ) {  
12.         RIL_onRequestComplete(t, RIL_E_RADIO_NOT_AVAILABLE, NULL, 0);  
13.         return;  
14.     }  
15.     /* Ignore all non-power requests when RADIO_STATE_OFF 
16.      * (except RIL_REQUEST_GET_SIM_STATUS) 
17.      */  
18.     if (sState == RADIO_STATE_OFF&& !(request == RIL_REQUEST_RADIO_POWER  
19.             || request == RIL_REQUEST_GET_SIM_STATUS)  
20.     ) {  
21.         RIL_onRequestComplete(t, RIL_E_RADIO_NOT_AVAILABLE, NULL, 0);  
22.         return;  
23.     }  
24.     switch (request) {  
25.         case RIL_REQUEST_GET_SIM_STATUS: {  
26.             RIL_CardStatus *p_card_status;  
27.             char *p_buffer;  
28.             int buffer_size;  
29.             int result = getCardStatus(&p_card_status);  
30.             if (result == RIL_E_SUCCESS) {  
31.                 p_buffer = (char *)p_card_status;  
32.                 buffer_size = sizeof(*p_card_status);  
33.             } else {  
34.                 p_buffer = NULL;  
35.                 buffer_size = 0;  
36.             }  
37.             RIL_onRequestComplete(t, result, p_buffer, buffer_size);  
38.             freeCardStatus(p_card_status);  
39.             break;  
40.         }  
41.         case RIL_REQUEST_GET_CURRENT_CALLS:  
42.             requestGetCurrentCalls(data, datalen, t);  
43.             break;  
44.         case RIL_REQUEST_DIAL:  
45.             requestDial(data, datalen, t);  
46.             break;  
47.         case RIL_REQUEST_HANGUP:  
48.             requestHangup(data, datalen, t);  
49.             break;  
50.         case RIL_REQUEST_HANGUP_WAITING_OR_BACKGROUND:  
51.             // 3GPP 22.030 6.5.5  
52.             // “Releases all held calls or sets User Determined User Busy  
53.             //  (UDUB) for a waiting call.”  
54.             at_send_command(“AT+CHLD=0”, NULL);  
55.             /* success or failure is ignored by the upper layer here. 
56.                it will call GET_CURRENT_CALLS and determine success that way */  
57.             RIL_onRequestComplete(t, RIL_E_SUCCESS, NULL, 0);  
58.             break;  
59.         case RIL_REQUEST_HANGUP_FOREGROUND_RESUME_BACKGROUND:  
60.             // 3GPP 22.030 6.5.5  
61.             // “Releases all active calls (if any exist) and accepts  
62.             //  the other (held or waiting) call.”  
63.             at_send_command(“AT+CHLD=1”, NULL);  
64.             /* success or failure is ignored by the upper layer here. 
65.                it will call GET_CURRENT_CALLS and determine success that way */  
66.             RIL_onRequestComplete(t, RIL_E_SUCCESS, NULL, 0);  
67.             break;  
68.         case RIL_REQUEST_SWITCH_WAITING_OR_HOLDING_AND_ACTIVE:  
69.             // 3GPP 22.030 6.5.5  
70.             // “Places all active calls (if any exist) on hold and accepts  
71.             //  the other (held or waiting) call.”  
72.             at_send_command(“AT+CHLD=2”, NULL);  
73.   
74. #ifdef WORKAROUND_ERRONEOUS_ANSWER  
75.             s_expectAnswer = 1;  
76. #endif /* WORKAROUND_ERRONEOUS_ANSWER */  
77.             /* success or failure is ignored by the upper layer here. 
78.                it will call GET_CURRENT_CALLS and determine success that way */  
79.             RIL_onRequestComplete(t, RIL_E_SUCCESS, NULL, 0);  
80.             break;  
81.         case RIL_REQUEST_ANSWER:  
82.             at_send_command(“ATA”, NULL);  
83. #ifdef WORKAROUND_ERRONEOUS_ANSWER  
84.             s_expectAnswer = 1;  
85. #endif /* WORKAROUND_ERRONEOUS_ANSWER */  
86.             /* success or failure is ignored by the upper layer here. 
87.                it will call GET_CURRENT_CALLS and determine success that way */  
88.             RIL_onRequestComplete(t, RIL_E_SUCCESS, NULL, 0);  
89.             break;  
90.         case RIL_REQUEST_CONFERENCE:  
91.             // 3GPP 22.030 6.5.5  
92.             // “Adds a held call to the conversation”  
93.             at_send_command(“AT+CHLD=3”, NULL);  
94.             /* success or failure is ignored by the upper layer here. 
95.                it will call GET_CURRENT_CALLS and determine success that way */  
96.             RIL_onRequestComplete(t, RIL_E_SUCCESS, NULL, 0);  
97.             break;  
98.         case RIL_REQUEST_UDUB:  
99.             /* user determined user busy */  
100.             /* sometimes used: ATH */  
101.             at_send_command(“ATH”, NULL);  
102.             /* success or failure is ignored by the upper layer here. 
103.                it will call GET_CURRENT_CALLS and determine success that way */  
104.             RIL_onRequestComplete(t, RIL_E_SUCCESS, NULL, 0);  
105.             break;  
106.         case RIL_REQUEST_SEPARATE_CONNECTION:  
107.             {  
108.                 char  cmd[12];  
109.                 int   party = ((int*)data)[0];  
110.                 // Make sure that party is in a valid range.  
111.                 // (Note: The Telephony middle layer imposes a range of 1 to 7.  
112.                 // It’s sufficient for us to just make sure it’s single digit.)  
113.                 if (party > 0 && party < 10) {  
114.                     sprintf(cmd, “AT+CHLD=2%d”, party);  
115.                     at_send_command(cmd, NULL);  
116.                     RIL_onRequestComplete(t, RIL_E_SUCCESS, NULL, 0);  
117.                 } else {  
118.                     RIL_onRequestComplete(t, RIL_E_GENERIC_FAILURE, NULL, 0);  
119.                 }  
120.             }  
121.             break;  
122.         case RIL_REQUEST_SIGNAL_STRENGTH:  
123.             requestSignalStrength(data, datalen, t);  
124.             break;  
125.         case RIL_REQUEST_REGISTRATION_STATE:  
126.         case RIL_REQUEST_GPRS_REGISTRATION_STATE:  
127.             requestRegistrationState(request, data, datalen, t);  
128.             break;  
129.         case RIL_REQUEST_OPERATOR:  
130.             requestOperator(data, datalen, t);  
131.             break;  
132.         case RIL_REQUEST_RADIO_POWER:  
133.             requestRadioPower(data, datalen, t);  
134.             break;  
135.         case RIL_REQUEST_DTMF: {  
136.             char c = ((char *)data)[0];  
137.             char *cmd;  
138.             asprintf(&cmd, “AT+VTS=%c”, (int)c);  
139.             at_send_command(cmd, NULL);  
140.             free(cmd);  
141.             RIL_onRequestComplete(t, RIL_E_SUCCESS, NULL, 0);  
142.             break;  
143.         }  
144.         case RIL_REQUEST_SEND_SMS:  
145.             requestSendSMS(data, datalen, t);  
146.             break;  
147.         case RIL_REQUEST_SETUP_DATA_CALL:  
148.             requestSetupDataCall(data, datalen, t);  
149.             break;  
150.         case RIL_REQUEST_SMS_ACKNOWLEDGE:  
151.             requestSMSAcknowledge(data, datalen, t);  
152.             break;  
153.         case RIL_REQUEST_GET_IMSI:  
154.             p_response = NULL;  
155.             err = at_send_command_numeric(“AT+CIMI”, &p_response);  
156.             if (err < 0 || p_response->success == 0) {  
157.                 RIL_onRequestComplete(t, RIL_E_GENERIC_FAILURE, NULL, 0);  
158.             } else {  
159.                 RIL_onRequestComplete(t, RIL_E_SUCCESS,  
160.                     p_response->p_intermediates->line, sizeof(char *));  
161.             }  
162.             at_response_free(p_response);  
163.             break;  
164.         case RIL_REQUEST_GET_IMEI:  
165.             p_response = NULL;  
166.             err = at_send_command_numeric(“AT+CGSN”, &p_response);  
167.   
168.             if (err < 0 || p_response->success == 0) {  
169.                 RIL_onRequestComplete(t, RIL_E_GENERIC_FAILURE, NULL, 0);  
170.             } else {  
171.                 RIL_onRequestComplete(t, RIL_E_SUCCESS,  
172.                     p_response->p_intermediates->line, sizeof(char *));  
173.             }  
174.             at_response_free(p_response);  
175.             break;  
176.         case RIL_REQUEST_SIM_IO:  
177.             requestSIM_IO(data,datalen,t);  
178.             break;  
179.         case RIL_REQUEST_SEND_USSD:  
180.             requestSendUSSD(data, datalen, t);  
181.             break;  
182.         case RIL_REQUEST_CANCEL_USSD:  
183.             p_response = NULL;  
184.             err = at_send_command_numeric(“AT+CUSD=2”, &p_response);  
185.             if (err < 0 || p_response->success == 0) {  
186.                 RIL_onRequestComplete(t, RIL_E_GENERIC_FAILURE, NULL, 0);  
187.             } else {  
188.                 RIL_onRequestComplete(t, RIL_E_SUCCESS,  
189.                     p_response->p_intermediates->line, sizeof(char *));  
190.             }  
191.             at_response_free(p_response);  
192.             break;  
193.         case RIL_REQUEST_SET_NETWORK_SELECTION_AUTOMATIC:  
194.             at_send_command(“AT+COPS=0”, NULL);  
195.             break;  
196.         case RIL_REQUEST_DATA_CALL_LIST:  
197.             requestDataCallList(data, datalen, t);  
198.             break;  
199.         case RIL_REQUEST_QUERY_NETWORK_SELECTION_MODE:  
200.             requestQueryNetworkSelectionMode(data, datalen, t);  
201.             break;  
202.         case RIL_REQUEST_OEM_HOOK_RAW:  
203.             // echo back data  
204.             RIL_onRequestComplete(t, RIL_E_SUCCESS, data, datalen);  
205.             break;  
206.         case RIL_REQUEST_OEM_HOOK_STRINGS: {  
207.             int i;  
208.             const char ** cur;  
209.             LOGD(“got OEM_HOOK_STRINGS: 0x%8p %lu”, data, (long)datalen);  
210.             for (i = (datalen / sizeof (char *)), cur = (const char **)data ;  
211.                     i > 0 ; cur++, i –) {  
212.                 LOGD(“> ‘%s'”, *cur);  
213.             }  
214.             // echo back strings  
215.             RIL_onRequestComplete(t, RIL_E_SUCCESS, data, datalen);  
216.             break;  
217.         }  
218.         case RIL_REQUEST_WRITE_SMS_TO_SIM:  
219.             requestWriteSmsToSim(data, datalen, t);  
220.             break;  
221.         case RIL_REQUEST_DELETE_SMS_ON_SIM: {  
222.             char * cmd;  
223.             p_response = NULL;  
224.             asprintf(&cmd, “AT+CMGD=%d”, ((int *)data)[0]);  
225.             err = at_send_command(cmd, &p_response);  
226.             free(cmd);  
227.             if (err < 0 || p_response->success == 0) {  
228.                 RIL_onRequestComplete(t, RIL_E_GENERIC_FAILURE, NULL, 0);  
229.             } else {  
230.                 RIL_onRequestComplete(t, RIL_E_SUCCESS, NULL, 0);  
231.             }  
232.             at_response_free(p_response);  
233.             break;  
234.         }  
235.         case RIL_REQUEST_ENTER_SIM_PIN:  
236.         case RIL_REQUEST_ENTER_SIM_PUK:  
237.         case RIL_REQUEST_ENTER_SIM_PIN2:  
238.         case RIL_REQUEST_ENTER_SIM_PUK2:  
239.         case RIL_REQUEST_CHANGE_SIM_PIN:  
240.         case RIL_REQUEST_CHANGE_SIM_PIN2:  
241.             requestEnterSimPin(data, datalen, t);  
242.             break;  
243.         case RIL_REQUEST_GSM_SMS_BROADCAST_ACTIVATION:  
244.             requestSmsBroadcastActivation(0,data, datalen, t);  
245.             break;  
246.         case RIL_REQUEST_GSM_SET_BROADCAST_SMS_CONFIG:  
247.              LOGD(“onRequest RIL_REQUEST_GSM_SET_BROADCAST_SMS_CONFIG”);  
248.             requestSetSmsBroadcastConfig(0,data, datalen, t);  
249.             break;  
250.         case RIL_REQUEST_GSM_GET_BROADCAST_SMS_CONFIG:  
251.             requestGetSmsBroadcastConfig(0,data, datalen, t);  
252.             break;  
253.         default:  
254.             RIL_onRequestComplete(t, RIL_E_REQUEST_NOT_SUPPORTED, NULL, 0);  
255.             break;  
256.     }  
257. }  

[cpp] 
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1. static void onRequest (int request, void *data, size_t datalen, RIL_Token t)  
2. {  
3.     ATResponse *p_response;  
4.     int err;  
5.     LOGD(“onRequest: %s”, requestToString(request));  
6.     /* Ignore all requests except RIL_REQUEST_GET_SIM_STATUS 
7.      * when RADIO_STATE_UNAVAILABLE. 
8.      */  
9.     if (sState == RADIO_STATE_UNAVAILABLE  
10.         && request != RIL_REQUEST_GET_SIM_STATUS  
11.     ) {  
12.         RIL_onRequestComplete(t, RIL_E_RADIO_NOT_AVAILABLE, NULL, 0);  
13.         return;  
14.     }  
15.     /* Ignore all non-power requests when RADIO_STATE_OFF 
16.      * (except RIL_REQUEST_GET_SIM_STATUS) 
17.      */  
18.     if (sState == RADIO_STATE_OFF&& !(request == RIL_REQUEST_RADIO_POWER  
19.             || request == RIL_REQUEST_GET_SIM_STATUS)  
20.     ) {  
21.         RIL_onRequestComplete(t, RIL_E_RADIO_NOT_AVAILABLE, NULL, 0);  
22.         return;  
23.     }  
24.     switch (request) {  
25.         case RIL_REQUEST_GET_SIM_STATUS: {  
26.             RIL_CardStatus *p_card_status;  
27.             char *p_buffer;  
28.             int buffer_size;  
29.             int result = getCardStatus(&p_card_status);  
30.             if (result == RIL_E_SUCCESS) {  
31.                 p_buffer = (char *)p_card_status;  
32.                 buffer_size = sizeof(*p_card_status);  
33.             } else {  
34.                 p_buffer = NULL;  
35.                 buffer_size = 0;  
36.             }  
37.             RIL_onRequestComplete(t, result, p_buffer, buffer_size);  
38.             freeCardStatus(p_card_status);  
39.             break;  
40.         }  
41.         case RIL_REQUEST_GET_CURRENT_CALLS:  
42.             requestGetCurrentCalls(data, datalen, t);  
43.             break;  
44.         case RIL_REQUEST_DIAL:  
45.             requestDial(data, datalen, t);  
46.             break;  
47.         case RIL_REQUEST_HANGUP:  
48.             requestHangup(data, datalen, t);  
49.             break;  
50.         case RIL_REQUEST_HANGUP_WAITING_OR_BACKGROUND:  
51.             // 3GPP 22.030 6.5.5  
52.             // “Releases all held calls or sets User Determined User Busy  
53.             //  (UDUB) for a waiting call.”  
54.             at_send_command(“AT+CHLD=0”, NULL);  
55.             /* success or failure is ignored by the upper layer here. 
56.                it will call GET_CURRENT_CALLS and determine success that way */  
57.             RIL_onRequestComplete(t, RIL_E_SUCCESS, NULL, 0);  
58.             break;  
59.         case RIL_REQUEST_HANGUP_FOREGROUND_RESUME_BACKGROUND:  
60.             // 3GPP 22.030 6.5.5  
61.             // “Releases all active calls (if any exist) and accepts  
62.             //  the other (held or waiting) call.”  
63.             at_send_command(“AT+CHLD=1”, NULL);  
64.             /* success or failure is ignored by the upper layer here. 
65.                it will call GET_CURRENT_CALLS and determine success that way */  
66.             RIL_onRequestComplete(t, RIL_E_SUCCESS, NULL, 0);  
67.             break;  
68.         case RIL_REQUEST_SWITCH_WAITING_OR_HOLDING_AND_ACTIVE:  
69.             // 3GPP 22.030 6.5.5  
70.             // “Places all active calls (if any exist) on hold and accepts  
71.             //  the other (held or waiting) call.”  
72.             at_send_command(“AT+CHLD=2”, NULL);  
73.   
74. #ifdef WORKAROUND_ERRONEOUS_ANSWER  
75.             s_expectAnswer = 1;  
76. #endif /* WORKAROUND_ERRONEOUS_ANSWER */  
77.             /* success or failure is ignored by the upper layer here. 
78.                it will call GET_CURRENT_CALLS and determine success that way */  
79.             RIL_onRequestComplete(t, RIL_E_SUCCESS, NULL, 0);  
80.             break;  
81.         case RIL_REQUEST_ANSWER:  
82.             at_send_command(“ATA”, NULL);  
83. #ifdef WORKAROUND_ERRONEOUS_ANSWER  
84.             s_expectAnswer = 1;  
85. #endif /* WORKAROUND_ERRONEOUS_ANSWER */  
86.             /* success or failure is ignored by the upper layer here. 
87.                it will call GET_CURRENT_CALLS and determine success that way */  
88.             RIL_onRequestComplete(t, RIL_E_SUCCESS, NULL, 0);  
89.             break;  
90.         case RIL_REQUEST_CONFERENCE:  
91.             // 3GPP 22.030 6.5.5  
92.             // “Adds a held call to the conversation”  
93.             at_send_command(“AT+CHLD=3”, NULL);  
94.             /* success or failure is ignored by the upper layer here. 
95.                it will call GET_CURRENT_CALLS and determine success that way */  
96.             RIL_onRequestComplete(t, RIL_E_SUCCESS, NULL, 0);  
97.             break;  
98.         case RIL_REQUEST_UDUB:  
99.             /* user determined user busy */  
100.             /* sometimes used: ATH */  
101.             at_send_command(“ATH”, NULL);  
102.             /* success or failure is ignored by the upper layer here. 
103.                it will call GET_CURRENT_CALLS and determine success that way */  
104.             RIL_onRequestComplete(t, RIL_E_SUCCESS, NULL, 0);  
105.             break;  
106.         case RIL_REQUEST_SEPARATE_CONNECTION:  
107.             {  
108.                 char  cmd[12];  
109.                 int   party = ((int*)data)[0];  
110.                 // Make sure that party is in a valid range.  
111.                 // (Note: The Telephony middle layer imposes a range of 1 to 7.  
112.                 // It’s sufficient for us to just make sure it’s single digit.)  
113.                 if (party > 0 && party < 10) {  
114.                     sprintf(cmd, “AT+CHLD=2%d”, party);  
115.                     at_send_command(cmd, NULL);  
116.                     RIL_onRequestComplete(t, RIL_E_SUCCESS, NULL, 0);  
117.                 } else {  
118.                     RIL_onRequestComplete(t, RIL_E_GENERIC_FAILURE, NULL, 0);  
119.                 }  
120.             }  
121.             break;  
122.         case RIL_REQUEST_SIGNAL_STRENGTH:  
123.             requestSignalStrength(data, datalen, t);  
124.             break;  
125.         case RIL_REQUEST_REGISTRATION_STATE:  
126.         case RIL_REQUEST_GPRS_REGISTRATION_STATE:  
127.             requestRegistrationState(request, data, datalen, t);  
128.             break;  
129.         case RIL_REQUEST_OPERATOR:  
130.             requestOperator(data, datalen, t);  
131.             break;  
132.         case RIL_REQUEST_RADIO_POWER:  
133.             requestRadioPower(data, datalen, t);  
134.             break;  
135.         case RIL_REQUEST_DTMF: {  
136.             char c = ((char *)data)[0];  
137.             char *cmd;  
138.             asprintf(&cmd, “AT+VTS=%c”, (int)c);  
139.             at_send_command(cmd, NULL);  
140.             free(cmd);  
141.             RIL_onRequestComplete(t, RIL_E_SUCCESS, NULL, 0);  
142.             break;  
143.         }  
144.         case RIL_REQUEST_SEND_SMS:  
145.             requestSendSMS(data, datalen, t);  
146.             break;  
147.         case RIL_REQUEST_SETUP_DATA_CALL:  
148.             requestSetupDataCall(data, datalen, t);  
149.             break;  
150.         case RIL_REQUEST_SMS_ACKNOWLEDGE:  
151.             requestSMSAcknowledge(data, datalen, t);  
152.             break;  
153.         case RIL_REQUEST_GET_IMSI:  
154.             p_response = NULL;  
155.             err = at_send_command_numeric(“AT+CIMI”, &p_response);  
156.             if (err < 0 || p_response->success == 0) {  
157.                 RIL_onRequestComplete(t, RIL_E_GENERIC_FAILURE, NULL, 0);  
158.             } else {  
159.                 RIL_onRequestComplete(t, RIL_E_SUCCESS,  
160.                     p_response->p_intermediates->line, sizeof(char *));  
161.             }  
162.             at_response_free(p_response);  
163.             break;  
164.         case RIL_REQUEST_GET_IMEI:  
165.             p_response = NULL;  
166.             err = at_send_command_numeric(“AT+CGSN”, &p_response);  
167.   
168.             if (err < 0 || p_response->success == 0) {  
169.                 RIL_onRequestComplete(t, RIL_E_GENERIC_FAILURE, NULL, 0);  
170.             } else {  
171.                 RIL_onRequestComplete(t, RIL_E_SUCCESS,  
172.                     p_response->p_intermediates->line, sizeof(char *));  
173.             }  
174.             at_response_free(p_response);  
175.             break;  
176.         case RIL_REQUEST_SIM_IO:  
177.             requestSIM_IO(data,datalen,t);  
178.             break;  
179.         case RIL_REQUEST_SEND_USSD:  
180.             requestSendUSSD(data, datalen, t);  
181.             break;  
182.         case RIL_REQUEST_CANCEL_USSD:  
183.             p_response = NULL;  
184.             err = at_send_command_numeric(“AT+CUSD=2”, &p_response);  
185.             if (err < 0 || p_response->success == 0) {  
186.                 RIL_onRequestComplete(t, RIL_E_GENERIC_FAILURE, NULL, 0);  
187.             } else {  
188.                 RIL_onRequestComplete(t, RIL_E_SUCCESS,  
189.                     p_response->p_intermediates->line, sizeof(char *));  
190.             }  
191.             at_response_free(p_response);  
192.             break;  
193.         case RIL_REQUEST_SET_NETWORK_SELECTION_AUTOMATIC:  
194.             at_send_command(“AT+COPS=0”, NULL);  
195.             break;  
196.         case RIL_REQUEST_DATA_CALL_LIST:  
197.             requestDataCallList(data, datalen, t);  
198.             break;  
199.         case RIL_REQUEST_QUERY_NETWORK_SELECTION_MODE:  
200.             requestQueryNetworkSelectionMode(data, datalen, t);  
201.             break;  
202.         case RIL_REQUEST_OEM_HOOK_RAW:  
203.             // echo back data  
204.             RIL_onRequestComplete(t, RIL_E_SUCCESS, data, datalen);  
205.             break;  
206.         case RIL_REQUEST_OEM_HOOK_STRINGS: {  
207.             int i;  
208.             const char ** cur;  
209.             LOGD(“got OEM_HOOK_STRINGS: 0x%8p %lu”, data, (long)datalen);  
210.             for (i = (datalen / sizeof (char *)), cur = (const char **)data ;  
211.                     i > 0 ; cur++, i –) {  
212.                 LOGD(“> ‘%s'”, *cur);  
213.             }  
214.             // echo back strings  
215.             RIL_onRequestComplete(t, RIL_E_SUCCESS, data, datalen);  
216.             break;  
217.         }  
218.         case RIL_REQUEST_WRITE_SMS_TO_SIM:  
219.             requestWriteSmsToSim(data, datalen, t);  
220.             break;  
221.         case RIL_REQUEST_DELETE_SMS_ON_SIM: {  
222.             char * cmd;  
223.             p_response = NULL;  
224.             asprintf(&cmd, “AT+CMGD=%d”, ((int *)data)[0]);  
225.             err = at_send_command(cmd, &p_response);  
226.             free(cmd);  
227.             if (err < 0 || p_response->success == 0) {  
228.                 RIL_onRequestComplete(t, RIL_E_GENERIC_FAILURE, NULL, 0);  
229.             } else {  
230.                 RIL_onRequestComplete(t, RIL_E_SUCCESS, NULL, 0);  
231.             }  
232.             at_response_free(p_response);  
233.             break;  
234.         }  
235.         case RIL_REQUEST_ENTER_SIM_PIN:  
236.         case RIL_REQUEST_ENTER_SIM_PUK:  
237.         case RIL_REQUEST_ENTER_SIM_PIN2:  
238.         case RIL_REQUEST_ENTER_SIM_PUK2:  
239.         case RIL_REQUEST_CHANGE_SIM_PIN:  
240.         case RIL_REQUEST_CHANGE_SIM_PIN2:  
241.             requestEnterSimPin(data, datalen, t);  
242.             break;  
243.         case RIL_REQUEST_GSM_SMS_BROADCAST_ACTIVATION:  
244.             requestSmsBroadcastActivation(0,data, datalen, t);  
245.             break;  
246.         case RIL_REQUEST_GSM_SET_BROADCAST_SMS_CONFIG:  
247.              LOGD(“onRequest RIL_REQUEST_GSM_SET_BROADCAST_SMS_CONFIG”);  
248.             requestSetSmsBroadcastConfig(0,data, datalen, t);  
249.             break;  
250.         case RIL_REQUEST_GSM_GET_BROADCAST_SMS_CONFIG:  
251.             requestGetSmsBroadcastConfig(0,data, datalen, t);  
252.             break;  
253.         default:  
254.             RIL_onRequestComplete(t, RIL_E_REQUEST_NOT_SUPPORTED, NULL, 0);  
255.             break;  
256.     }  
257. }  

对每一个RIL_REQUEST_XXX请求转化成相应的ATcommand，发送给modem，然后睡眠等待，当收到ATcommand的最终响应后，线程被唤醒，将响应传给客户端进程。

2.currentState

[cpp] 
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1. static RIL_RadioState currentState()  
2. {  
3.     return sState;  
4. }  

[cpp] 
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1. static RIL_RadioState currentState()  
2. {  
3.     return sState;  
4. }  

3.onSupports

[cpp] 
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1. static int onSupports (int requestCode)  
2. {  
3.     //@@@ todo  
4.     return 1;  
5. }  

[cpp] 
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1. static int onSupports (int requestCode)  
2. {  
3.     //@@@ todo  
4.     return 1;  
5. }  

4.onCancel

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1. static void onCancel (RIL_Token t)  
2. {  
3.     //@@@todo  
4. }  

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1. static void onCancel (RIL_Token t)  
2. {  
3.     //@@@todo  
4. }  

5.getVersion

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1. static const char * getVersion(void)  
2. {  
3.     return “android reference-ril 1.0”;  
4. }  

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1. static const char * getVersion(void)  
2. {  
3.     return “android reference-ril 1.0”;  
4. }  

注册RIL_Env接口

由于各手机厂商的AT指令差异，因此与modem交互层需要各手机厂商实现，以动态库的形式提供。作为介于modem与上层的中间层，即要与底层交互也要与上层通信，因此就需要定义一个接口来衔接RILD与动态库，RIL_Env和RIL_RadioFunctions接口就是libril.so与librefrence.so通信的桥梁。是Rild架构中用于隔离通用代码和厂商代码的接口，RIL_Env由通用代码实现，而RIL_RadioFunctions则是由厂商代码实现。


RIL_Init的主要任务：

1. 向librefrence.so注册libril.so提供的接口RIL_Env；

2. 创建一个mainLoop工作线程，用于初始化AT模块，并监控AT模块的状态，一旦AT被关闭，则重新打开并初始化AT；

3. 当AT被打开后，mainLoop工作线程将向Rild提交一个定时事件，并触发eventLoop来完成对modem的初始化；

4. 创建一个readLoop工作线程，用于从AT串口中读取数据；

5.返回librefrence.so提供的接口RIL_RadioFunctions；

hardware\ril\reference-ril\reference-ril.c

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1. const RIL_RadioFunctions *RIL_Init(const struct RIL_Env *env, int argc, char **argv)  
2. {  
3.     int ret;  
4.     int fd = -1;  
5.     int opt;  
6.     pthread_attr_t attr;  
7. 　　s_rilenv = env; //将ril.cpp中定义的RIL_Env注册到reference-ril.c中的s_rilenv  
8.     while ( -1 != (opt = getopt(argc, argv, “p:d:s:”))) {  
9.         switch (opt) {  
10.             case ‘p’:  
11.                 s_port = atoi(optarg);  
12.                 if (s_port == 0) {  
13.                     usage(argv[0]);  
14.                     return NULL;  
15.                 }  
16.                 LOGI(“Opening loopback port %d\n”, s_port);  
17.             break;  
18.             case ‘d’:  
19.                 s_device_path = optarg;  
20.                 LOGI(“Opening tty device %s\n”, s_device_path);  
21.             break;  
22.             case ‘s’:  
23.                 s_device_path   = optarg;  
24.                 s_device_socket = 1;  
25.                 LOGI(“Opening socket %s\n”, s_device_path);  
26.             break;  
27.             default:  
28.                 usage(argv[0]);  
29.                 return NULL;  
30.         }  
31.     }  
32.     if (s_port < 0 && s_device_path == NULL) {  
33.         usage(argv[0]);  
34.         return NULL;  
35.     }  
36.     pthread_attr_init (&attr);  
37. 　　pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);  
38. 　　//创建一个mainLoop线程  
39. 　　ret = pthread_create(&s_tid_mainloop, &attr, mainLoop, NULL);  
40. 　　//将reference-ril.c中定义的RIL_RadioFunctions返回并注册到ril.cpp中的s_callbacks  
41.     return &s_callbacks;  
42. }  

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1. const RIL_RadioFunctions *RIL_Init(const struct RIL_Env *env, int argc, char **argv)  
2. {  
3.     int ret;  
4.     int fd = -1;  
5.     int opt;  
6.     pthread_attr_t attr;  
7. 　　s_rilenv = env; //将ril.cpp中定义的RIL_Env注册到reference-ril.c中的s_rilenv  
8.     while ( -1 != (opt = getopt(argc, argv, “p:d:s:”))) {  
9.         switch (opt) {  
10.             case ‘p’:  
11.                 s_port = atoi(optarg);  
12.                 if (s_port == 0) {  
13.                     usage(argv[0]);  
14.                     return NULL;  
15.                 }  
16.                 LOGI(“Opening loopback port %d\n”, s_port);  
17.             break;  
18.             case ‘d’:  
19.                 s_device_path = optarg;  
20.                 LOGI(“Opening tty device %s\n”, s_device_path);  
21.             break;  
22.             case ‘s’:  
23.                 s_device_path   = optarg;  
24.                 s_device_socket = 1;  
25.                 LOGI(“Opening socket %s\n”, s_device_path);  
26.             break;  
27.             default:  
28.                 usage(argv[0]);  
29.                 return NULL;  
30.         }  
31.     }  
32.     if (s_port < 0 && s_device_path == NULL) {  
33.         usage(argv[0]);  
34.         return NULL;  
35.     }  
36.     pthread_attr_init (&attr);  
37. 　　pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);  
38. 　　//创建一个mainLoop线程  
39. 　　ret = pthread_create(&s_tid_mainloop, &attr, mainLoop, NULL);  
40. 　　//将reference-ril.c中定义的RIL_RadioFunctions返回并注册到ril.cpp中的s_callbacks  
41.     return &s_callbacks;  
42. }  

mainLoop工作线程是用来初始化并监控AT模块的，一旦AT模块被关闭，就自动打开。

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1. static void * mainLoop(void *param)  
2. {  
3.     int fd;  
4.     int ret;  
5. 　　AT_DUMP(“== “, “entering mainLoop()”, -1 );  
6. 　　//为AT模块设置回调函数  
7.     at_set_on_reader_closed(onATReaderClosed);  
8.     at_set_on_timeout(onATTimeout);  
9.     for (;;) {  
10.         fd = -1;  
11.         while  (fd < 0) { //获得串口AT模块的设备文件描述符  
12.             if (s_port > 0) {  
13.                 fd = socket_loopback_client(s_port, SOCK_STREAM);  
14.             } else if (s_device_socket) {  
15.                 if (!strcmp(s_device_path, “/dev/socket/qemud”)) {  
16.                     /* Qemu-specific control socket */  
17.                     fd = socket_local_client( “qemud”,  
18.                  ANDROID_SOCKET_NAMESPACE_RESERVED,SOCK_STREAM );  
19.                     if (fd >= 0 ) {  
20.                         char  answer[2];  
21.                         if ( write(fd, “gsm”, 3) != 3 ||read(fd, answer, 2) != 2 ||  
22.                              memcmp(answer, “OK”, 2) != 0)  
23.                         {  
24.                             close(fd);  
25.                             fd = -1;  
26.                         }  
27.                    }  
28.                 }  
29.                 else  
30.                     fd = socket_local_client( s_device_path,    ANDROID_SOCKET_NAMESPACE_FILESYSTEM,SOCK_STREAM );  
31.             } else if (s_device_path != NULL) {  
32.                 fd = open (s_device_path, O_RDWR);  
33.                 if ( fd >= 0 && !memcmp( s_device_path, “/dev/ttyS”, 9 ) ) {  
34.                     /* disable echo on serial ports */  
35.                     struct termios  ios;  
36.                     tcgetattr( fd, &ios );  
37.                     ios.c_lflag = 0;  /* disable ECHO, ICANON, etc… */  
38.                     tcsetattr( fd, TCSANOW, &ios );  
39.                 }  
40.             }  
41.             if (fd < 0) {  
42.                 perror (“opening AT interface. retrying…”);  
43.                 sleep(10);  
44.             }  
45.         }  
46.         s_closed = 0;  
47.         //打开AT模块，创建AT读取线程s_tid_reader，fd为modem设备文件句柄  
48.         ret = at_open(fd, onUnsolicited);  
49.         if (ret < 0) {  
50.             LOGE (“AT error %d on at_open\n”, ret);  
51.             return 0;  
52.         }  
53.         //向Rild提交超时任务  
54.         RIL_requestTimedCallback(initializeCallback, NULL, &TIMEVAL_0);  
55.         sleep(1);  
56.         //如果AT模块被关闭，则waitForClose返回，重新打开AT，如果AT已打开，则阻塞  
57.         waitForClose();  
58.         LOGI(“Re-opening after close”);  
59.     }  
60. }  

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1. static void * mainLoop(void *param)  
2. {  
3.     int fd;  
4.     int ret;  
5. 　　AT_DUMP(“== “, “entering mainLoop()”, -1 );  
6. 　　//为AT模块设置回调函数  
7.     at_set_on_reader_closed(onATReaderClosed);  
8.     at_set_on_timeout(onATTimeout);  
9.     for (;;) {  
10.         fd = -1;  
11.         while  (fd < 0) { //获得串口AT模块的设备文件描述符  
12.             if (s_port > 0) {  
13.                 fd = socket_loopback_client(s_port, SOCK_STREAM);  
14.             } else if (s_device_socket) {  
15.                 if (!strcmp(s_device_path, “/dev/socket/qemud”)) {  
16.                     /* Qemu-specific control socket */  
17.                     fd = socket_local_client( “qemud”,  
18.                  ANDROID_SOCKET_NAMESPACE_RESERVED,SOCK_STREAM );  
19.                     if (fd >= 0 ) {  
20.                         char  answer[2];  
21.                         if ( write(fd, “gsm”, 3) != 3 ||read(fd, answer, 2) != 2 ||  
22.                              memcmp(answer, “OK”, 2) != 0)  
23.                         {  
24.                             close(fd);  
25.                             fd = -1;  
26.                         }  
27.                    }  
28.                 }  
29.                 else  
30.                     fd = socket_local_client( s_device_path,    ANDROID_SOCKET_NAMESPACE_FILESYSTEM,SOCK_STREAM );  
31.             } else if (s_device_path != NULL) {  
32.                 fd = open (s_device_path, O_RDWR);  
33.                 if ( fd >= 0 && !memcmp( s_device_path, “/dev/ttyS”, 9 ) ) {  
34.                     /* disable echo on serial ports */  
35.                     struct termios  ios;  
36.                     tcgetattr( fd, &ios );  
37.                     ios.c_lflag = 0;  /* disable ECHO, ICANON, etc… */  
38.                     tcsetattr( fd, TCSANOW, &ios );  
39.                 }  
40.             }  
41.             if (fd < 0) {  
42.                 perror (“opening AT interface. retrying…”);  
43.                 sleep(10);  
44.             }  
45.         }  
46.         s_closed = 0;  
47.         //打开AT模块，创建AT读取线程s_tid_reader，fd为modem设备文件句柄  
48.         ret = at_open(fd, onUnsolicited);  
49.         if (ret < 0) {  
50.             LOGE (“AT error %d on at_open\n”, ret);  
51.             return 0;  
52.         }  
53.         //向Rild提交超时任务  
54.         RIL_requestTimedCallback(initializeCallback, NULL, &TIMEVAL_0);  
55.         sleep(1);  
56.         //如果AT模块被关闭，则waitForClose返回，重新打开AT，如果AT已打开，则阻塞  
57.         waitForClose();  
58.         LOGI(“Re-opening after close”);  
59.     }  
60. }  

1.打开AT模块

通过at_open打开文件描述符为fd的AT串口设备，并注册回调函数ATUnsolHandler 

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