linux socket 获取错误代码,Linux中socket 错误编码表 errno

￡神魔★判官ぃ 2023-01-21 10:26 3阅读 0赞

最近在网络编程使用的过程中，发现errno会经常使用。因此决定在此做个留用，以备以后使用。。。

虽然errno是非线程安全的，但是可以通过几种机制保证其安全。。

最近在使用的过程中获得了errno，程序无法执行，也不知道如何解决问题。因此，理解每一个返回的errno整数值的含义是很重要的。。

这个我们可以通过strerror函数来实现。。

strerror(返回整数errno对应的错误原因的描述字符串)

所需头文件：  \#include函数声明：    char \* strerror(int errnum);

输入：          整数errno

输出：         返回描述错误原因的字符串指针

功能：         用来依参数errnum 的错误代码来查询其错误原因的描述字符串,然后将该字符串指针返回。

示例：

\#include \#include

\#define NUM    150

int main(void)

int i;

for ( i=0; i\{

printf( "%d:%s\\n", i, strerror(i) );

return 0;

运行结果：

0:Success

1:Operation not permitted

2:No such file or directory

3:No such process

4:Interrupted system call

5:Input/output error

6:No such device or address

7:Argument list too long

8:Exec format error

9:Bad file descriptor

10:No child processes

11:Resource temporarily unavailable

12:Cannot allocate memory

13:Permission denied

14:Bad address

15:Block device required

16:Device or resource busy

17:File exists

18:Invalid cross-device link

19:No such device

20:Not a directory

21:Is a directory

22:Invalid argument

23:Too many open files in system

24:Too many open files

25:Inappropriate ioctl for device

26:Text file busy

27:File too large

28:No space left on device

29:Illegal seek

30:Read-only file system

31:Too many links

32:Broken pipe

33:Numerical argument out of domain

34:Numerical result out of range

35:Resource deadlock avoided

36:File name too long

37:No locks available

38:Function not implemented

39:Directory not empty

40:Too many levels of symbolic links

41:Unknown error 41

42:No message of desired type

43:Identifier removed

44:Channel number out of range

45:Level 2 not synchronized

46:Level 3 halted

47:Level 3 reset

48:Link number out of range

49:Protocol driver not attached

50:No CSI structure available

51:Level 2 halted

52:Invalid exchange

53:Invalid request descriptor

54:Exchange full

55:No anode

56:Invalid request code

57:Invalid slot

58:Unknown error 58

59:Bad font file format

60:Device not a stream

61:No data available

62:Timer expired

63:Out of streams resources

64:Machine is not on the network

65:Package not installed

66:Object is remote

67:Link has been severed

68:Advertise error

69:Srmount error

70:Communication error on send

71:Protocol error

72:Multihop attempted

73:RFS specific error

74:Bad message

75:Value too large for defined data type

76:Name not unique on network

77:File descriptor in bad state

78:Remote address changed

79:Can not access a needed shared library

80:Accessing a corrupted shared library

81:.lib section in a.out corrupted

82:Attempting to link in too many shared libraries

83:Cannot exec a shared library directly

84:Invalid or incomplete multibyte or wide character

85:Interrupted system call should be restarted

86:Streams pipe error

87:Too many users

88:Socket operation on non-socket

89:Destination address required

90:Message too long

91:Protocol wrong type for socket

92:Protocol not available

93:Protocol not supported

94:Socket type not supported

95:Operation not supported

96:Protocol family not supported

97:Address family not supported by protocol

98:Address already in use

99:Cannot assign requested address

100:Network is down

101:Network is unreachable

102:Network dropped connection on reset

103:Software caused connection abort

104:Connection reset by peer

105:No buffer space available

106:Transport endpoint is already connected

107:Transport endpoint is not connected

108:Cannot send after transport endpoint shutdown

109:Too many references: cannot splice

110:Connection timed out

111:Connection refused

112:Host is down

113:No route to host

114:Operation already in progress

115:Operation now in progress

116:Stale NFS file handle

117:Structure needs cleaning

118:Not a XENIX named type file

119:No XENIX semaphores available

120:Is a named type file

121:Remote I/O error

122:Disk quota exceeded

123:No medium found

124:Wrong medium type

125:Operation canceled

126:Required key not available

127:Key has expired

128:Key has been revoked

129:Key was rejected by service

130:Owner died

131:State not recoverable

132:Unknown error 132

133:Unknown error 133

134:Unknown error 134

135:Unknown error 135

136:Unknown error 136

137:Unknown error 137

138:Unknown error 138

139:Unknown error 139

140:Unknown error 140

141:Unknown error 141

142:Unknown error 142

143:Unknown error 143

144:Unknown error 144

145:Unknown error 145

146:Unknown error 146

147:Unknown error 147

148:Unknown error 148

149:Unknown error 149

通过这个我们终于理解errno的含义了。。那天做的一个使用非阻塞connect式爬虫，无论如何也不好使，也不知道怎么解决，程序并没有出现段错误，最终定位在write套接字时就退出，而通过FD\_ISSET测试此套接字可写，于是不知道怎么解决了。通过捕捉errno值，发现是104.而如果当时我可以知道errno=104是指“Connection reset by peer”，那么我就知道了网络爬虫式客户端需要增加对于SIGPIPE信号的处理了。。因为SIGPIPE默认处理方式是退出，改成自己添加信号处理函数或者使用忽略就可以了。。。

所以列出这些信息，一方面能对大家有所帮助，另一方面方便以后查询。

1\#ifndef \_ASM\_GENERIC\_ERRNO\_BASE\_H

2\#define \_ASM\_GENERIC\_ERRNO\_BASE\_H

4\#define EPERM            1      /\* Operation not permitted \*/

5\#define ENOENT           2      /\* No such file or directory \*/

6\#define ESRCH            3      /\* No such process \*/

7\#define EINTR            4      /\* Interrupted system call \*/

8\#define EIO              5      /\* I/O error \*/

9\#define ENXIO            6      /\* No such device or address \*/

10\#define E2BIG            7      /\* Argument list too long \*/

11\#define ENOEXEC          8      /\* Exec format error \*/

12\#define EBADF            9      /\* Bad file number \*/

13\#define ECHILD          10      /\* No child processes \*/

14\#define EAGAIN          11      /\* Try again \*/

15\#defineENOMEM12      /\* Out of memory \*/

16\#define EACCES          13      /\* Permission denied \*/

17\#define EFAULT          14      /\* Bad address \*/

18\#define ENOTBLK         15      /\* Block device required \*/

19\#define EBUSY           16      /\* Device or resource busy \*/

20\#define EEXIST          17      /\* File exists \*/

21\#define EXDEV           18      /\* Cross-device link \*/

22\#define ENODEV          19      /\* No such device \*/

23\#define ENOTDIR         20      /\* Not a directory \*/

24\#define EISDIR          21      /\* Is a directory \*/

25\#define EINVAL          22      /\* Invalid argument \*/

26\#define ENFILE          23      /\* File table overflow \*/

27\#define EMFILE          24      /\* Too many open files \*/

28\#define ENOTTY          25      /\* Not a typewriter \*/

29\#define ETXTBSY         26      /\* Text file busy \*/

30\#define EFBIG           27      /\* File too large \*/

31\#define ENOSPC          28      /\* No space left on device \*/

32\#define ESPIPE          29      /\* Illegal seek \*/

33\#define EROFS           30      /\* Read-only file system \*/

34\#define EMLINK          31      /\* Too many links \*/

35\#define EPIPE           32      /\* Broken pipe \*/

36\#define EDOM            33      /\* Math argument out of domain of func \*/

37\#define ERANGE          34      /\* Math result not representable \*/

39\#endif

linux socket 获取错误代码,Linux中socket 错误编码表 errno

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