网上关于 errno 的资料，要么没有错误名，要么没有错误号，要么格式编排混乱……算了，自己记一个吧
本文地址：https://segmentfault.com/a/1190000006544500
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#define EPERM 1 /* Operation not permitted */ 操作不允许
#define ENOENT 2 /* No such file or directory */ 文件或者目录不存在
#define ESRCH 3 /* No such process */ 进程不存在
#define EINTR 4 /* Interrupted system call */ 系统调用被中断
#define EIO 5 /* I/O error */ I/O 错误
#define ENXIO 6 /* No such device or address */ 设备或地址不存在
#define E2BIG 7 /* Arg list too long */ 参数列表太长
#define ENOEXEC 8 /* Exec format error */ 执行格式错误
#define EBADF 9 /* Bad file number */ 文件描述符错误
#define ECHILD 10 /* No child processes */ 没有子进程
#define EAGAIN 11 /* Try again */ 请重试
#define ENOMEM 12 /* Out of memory */ 内存不足
#define EACCES 13 /* Permission denied */ 认证被拒绝
#define EFAULT 14 /* Bad address */ 不可用的地址
#define ENOTBLK 15 /* Block device required */ 要求使用块设备
#define EBUSY 16 /* Device or resource busy */ 设备或资源忙17~32
#define EEXIST 17 /* File exists */ 文件已经存在
#define EXDEV 18 /* Cross-device link */ 交叉设备链接？
#define ENODEV 19 /* No such device */ 没有这个设备
#define ENOTDIR 20 /* Not a directory */ 不是一个目录
#define EISDIR 21 /* Is a directory */ 是一个目录
#define EINVAL 22 /* Invalid argument */ 不可用的参数
#define ENFILE 23 /* File table overflow */ 文件表溢出
#define EMFILE 24 /* Too many open files */ 打开文件太多
#define ENOTTY 25 /* Not a typewriter */
#define ETXTBSY 26 /* Text file busy */ 文本文件忙
#define EFBIG 27 /* File too large */ 文件太大
#define ENOSPC 28 /* No space left on device */ 设备剩余空间不足
#define ESPIPE 29 /* Illegal seek */ 不合法的seek
#define EROFS 30 /* Read-only file system */ 文件系统只读
#define EMLINK 31 /* Too many links */ 链接太多
#define EPIPE 32 /* Broken pipe */ 断掉的管道33~48
#define EDOM 33 /* Math argument out of domain of func */
#define ERANGE 34 /* Math result not representable */ 计算结果无法表示出来
#define EDEADLK 35 /* Resource deadlock would occur */ 可能发生资源死锁
#define ENAMETOOLONG 36 /* File name too long */ 文件名太长
#define ENOLCK 37 /* No record locks available */ 没有可用的记录锁
#define ENOSYS 38 /* Function not implemented */ 函数还没有被实现
#define ENOTEMPTY 39 /* Directory not empty */ 目录非空
#define ELOOP 40 /* Too many symbolic links encountered */ 太多软链接
#define EWOULDBLOCK EAGAIN /* Operation would block / (12) Try again */
#define ENOMSG 42 /* No message of desired type */ 针对指定的类型，没有信息可用
#define EIDRM 43 /* Identifier removed */ 标识符已经被移除掉
#define ECHRNG 44 /* Channel number out of range */ 通道号超出范围
#define EL2NSYNC 45 /* Level 2 not synchronized */
#define EL3HLT 46 /* Level 3 halted */
#define EL3RST 47 /* Level 3 reset */
#define ELNRNG 48 /* Link number out of range */ 链接数超出范围49~64
#define EUNATCH 49 /* Protocol driver not attached */
#define ENOCSI 50 /* No CSI structure available */
#define EL2HLT 51 /* Level 2 halted */
#define EBADE 52 /* Invalid exchange */
#define EBADR 53 /* Invalid request descriptor */
#define EXFULL 54 /* Exchange full */
#define ENOANO 55 /* No anode */
#define EBADRQC 56 /* Invalid request code */
#define EBADSLT 57 /* Invalid slot */
#define EDEADLOCK EDEADLK /* (35) Resource deadlock would occur */
#define EBFONT 59 /* Bad font file format */
#define ENOSTR 60 /* Device not a stream */
#define ENODATA 61 /* No data available */
#define ETIME 62 /* Timer expired */
#define ENOSR 63 /* Out of streams resources */
#define ENONET 64 /* Machine is not on the network */65~80
#define ENOPKG 65 /* Package not installed */
#define EREMOTE 66 /* Object is remote */
#define ENOLINK 67 /* Link has been severed */
#define EADV 68 /* Advertise error */
#define ESRMNT 69 /* Srmount error */
#define ECOMM 70 /* Communication error on send */
#define EPROTO 71 /* Protocol error */
#define EMULTIHOP 72 /* Multihop attempted */
#define EDOTDOT 73 /* RFS specific error */
#define EBADMSG 74 /* Not a data message */
#define EOVERFLOW 75 /* Value too large for defined data type */
#define ENOTUNIQ 76 /* Name not unique on network */
#define EBADFD 77 /* File descriptor in bad state */
#define EREMCHG 78 /* Remote address changed */
#define ELIBACC 79 /* Can not access a needed shared library */
#define ELIBBAD 80 /* Accessing a corrupted shared library */81~96
#define ELIBSCN 81 /* .lib section in a.out corrupted */
#define ELIBMAX 82 /* Attempting to link in too many shared libraries */
#define ELIBEXEC 83 /* Cannot exec a shared library directly */
#define EILSEQ 84 /* Illegal byte sequence */
#define ERESTART 85 /* Interrupted system call should be restarted */
#define ESTRPIPE 86 /* Streams pipe error */
#define EUSERS 87 /* Too many users */
#define ENOTSOCK 88 /* Socket operation on non-socket */
#define EDESTADDRREQ 89 /* Destination address required */
#define EMSGSIZE 90 /* Message too long */
#define EPROTOTYPE 91 /* Protocol wrong type for socket */
#define ENOPROTOOPT 92 /* Protocol not available */
#define EPROTONOSUPPORT 93 /* Protocol not supported */
#define ESOCKTNOSUPPORT 94 /* Socket type not supported */
#define EOPNOTSUPP 95 /* Operation not supported on transport endpoint */
#define EPFNOSUPPORT 96 /* Protocol family not supported */97~112
#define EAFNOSUPPORT 97 /* Address family not supported by protocol */
#define EADDRINUSE 98 /* Address already in use */
#define EADDRNOTAVAIL 99 /* Cannot assign requested address */
#define ENETDOWN 100 /* Network is down */
#define ENETUNREACH 101 /* Network is unreachable */
#define ENETRESET 102 /* Network dropped connection because of reset */
#define ECONNABORTED 103 /* Software caused connection abort */
#define ECONNRESET 104 /* Connection reset by peer */
#define ENOBUFS 105 /* No buffer space available */
#define EISCONN 106 /* Transport endpoint is already connected */
#define ENOTCONN 107 /* Transport endpoint is not connected */
#define ESHUTDOWN 108 /* Cannot send after transport endpoint shutdown */
#define ETOOMANYREFS 109 /* Too many references: cannot splice */
#define ETIMEDOUT 110 /* Connection timed out */
#define ECONNREFUSED 111 /* Connection refused */
#define EHOSTDOWN 112 /* Host is down */113~124
#define EHOSTUNREACH 113 /* No route to host */
#define EALREADY 114 /* Operation already in progress */
#define EINPROGRESS 115 /* Operation now in progress */
#define ESTALE 116 /* Stale NFS file handle */
#define EUCLEAN 117 /* Structure needs cleaning */
#define ENOTNAM 118 /* Not a XENIX named type file */
#define ENAVAIL 119 /* No XENIX semaphores available */
#define EISNAM 120 /* Is a named type file */
#define EREMOTEIO 121 /* Remote I/O error */
#define EDQUOT 122 /* Quota exceeded */
#define ENOMEDIUM 123 /* No medium found */
#define EMEDIUMTYPE 124 /* Wrong medium type */