码迷,mamicode.com
首页 > 其他好文 > 详细

errno.c

时间:2015-04-26 22:56:07      阅读:330      评论:0      收藏:0      [点我收藏+]

标签:

#include <stdio.h>
#include <string.h>
#include <errno.h>

int main(int argc, char *argv[])
{
	fprintf(stderr, "EACCES : %s\n",strerror(EACCES));
	errno = ENOENT;
	perror(argv[0]);
	return 0;
}
函数fprintf:
int fprintf(FILE *stream, const char *format, ...); 
//根据参数format字符串来转换并格式化数据,然后将结果输出到参数stream指定的文件中,直到出现字符串结束为主。关于参数format字符串的格式参考printf()。成功返回世界输出的字符串,失败返回-1.

函数strerror:
char *strerror(int errnum);//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。

函数perror:
void perror(const char *s);
//将函数发生的错误原因输出的标准设备(stderr)。参数s所指的字符串会先打印出,后面再加上错误原因字符串。此错误原因依照全局变量errno的值来决定要输出的字符串

errno :
errno是一个全局变量,当调用某些函数出错时,该函数会重设errno的值。
errno的一下错误定义如下

E2BIG           Argument list too long (POSIX.1)

EACCES          Permission denied (POSIX.1)

EADDRINUSE      Address already in use (POSIX.1)

EADDRNOTAVAIL   Address not available (POSIX.1)

EAFNOSUPPORT    Address family not supported (POSIX.1)

EAGAIN          Resource  temporarily  unavailable  (may  be  the  same  value  as  EWOULDBLOCK)(POSIX.1)

EALREADY        Connection already in progress (POSIX.1)

EBADE           Invalid exchange

EBADF           Bad file descriptor (POSIX.1)

EBADFD          File descriptor in bad state

EBADMSG         Bad message (POSIX.1)

EBADR           Invalid request descriptor

EBADRQC         Invalid request code

EBADSLT         Invalid slot

EBUSY           Device or resource busy (POSIX.1)

ECANCELED       Operation canceled (POSIX.1)

ECHILD          No child processes (POSIX.1)

ECHRNG          Channel number out of range

ECOMM           Communication error on send

ECONNABORTED    Connection aborted (POSIX.1)

ECONNREFUSED    Connection refused (POSIX.1)

ECONNRESET      Connection reset (POSIX.1)

EDEADLK         Resource deadlock avoided (POSIX.1)

EDEADLOCK       Synonym for EDEADLK

EDESTADDRREQ    Destination address required (POSIX.1)

EDOM            Mathematics argument out of domain of function (POSIX.1, C99)

EDQUOT          Disk quota exceeded (POSIX.1)

EEXIST          File exists (POSIX.1)

EFAULT          Bad address (POSIX.1)

EFBIG           File too large (POSIX.1)

EHOSTDOWN       Host is down

EHOSTUNREACH    Host is unreachable (POSIX.1)

EIDRM           Identifier removed (POSIX.1)

EILSEQ          Illegal byte sequence (POSIX.1, C99)

EINPROGRESS     Operation in progress (POSIX.1)

EINTR           Interrupted function call (POSIX.1); see signal(7).

EINVAL          Invalid argument (POSIX.1)

EIO             Input/output error (POSIX.1)

EISCONN         Socket is connected (POSIX.1)

EISDIR          Is a directory (POSIX.1)

EISNAM          Is a named type file

EKEYEXPIRED     Key has expired

EKEYREJECTED    Key was rejected by service

EKEYREVOKED     Key has been revoked

EL2HLT          Level 2 halted

EL2NSYNC        Level 2 not synchronized

EL3HLT          Level 3 halted

EL3RST          Level 3 halted

ELIBACC         Cannot access a needed shared library

ELIBBAD         Accessing a corrupted shared library

ELIBMAX         Attempting to link in too many shared libraries

ELIBSCN         lib section in a.out corrupted

ELIBEXEC        Cannot exec a shared library directly

ELOOP           Too many levels of symbolic links (POSIX.1)

EMEDIUMTYPE     Wrong medium type

EMFILE          Too many open files (POSIX.1)

EMLINK          Too many links (POSIX.1)

EMSGSIZE        Message too long (POSIX.1)

EMULTIHOP       Multihop attempted (POSIX.1)

ENAMETOOLONG    Filename too long (POSIX.1)

ENETDOWN        Network is down (POSIX.1)

ENETRESET       Connection aborted by network (POSIX.1)

ENETUNREACH     Network unreachable (POSIX.1)

ENFILE          Too many open files in system (POSIX.1)

ENOBUFS         No buffer space available (POSIX.1 (XSI STREAMS option))

ENODATA         No message is available on the STREAM head read queue (POSIX.1)

ENODEV          No such device (POSIX.1)

ENOENT          No such file or directory (POSIX.1)

ENOEXEC         Exec format error (POSIX.1)

ENOKEY          Required key not available

ENOLCK          No locks available (POSIX.1)

ENOLINK         Link has been severed (POSIX.1)

ENOMEDIUM       No medium found

ENOMEM          Not enough space (POSIX.1)

ENOMSG          No message of the desired type (POSIX.1)

ENONET          Machine is not on the network

ENOPKG          Package not installed

ENOPROTOOPT     Protocol not available (POSIX.1)

ENOSPC          No space left on device (POSIX.1)

ENOSR           No STREAM resources (POSIX.1 (XSI STREAMS option))

ENOSTR          Not a STREAM (POSIX.1 (XSI STREAMS option))

ENOSYS          Function not implemented (POSIX.1)

ENOTBLK         Block device required

ENOTCONN        The socket is not connected (POSIX.1)

ENOTDIR         Not a directory (POSIX.1)

ENOTEMPTY       Directory not empty (POSIX.1)

ENOTSOCK        Not a socket (POSIX.1)

ENOTSUP         Operation not supported (POSIX.1)

ENOTTY          Inappropriate I/O control operation (POSIX.1)

ENOTUNIQ        Name not unique on network

ENXIO           No such device or address (POSIX.1)

EOPNOTSUPP      Operation not supported on socket (POSIX.1)

                (ENOTSUP  and  EOPNOTSUPP have the same value on Linux, but according to POSIX.1
				these error values should be distinct.)

EOVERFLOW       Value too large to be stored in data type (POSIX.1)

EPERM           Operation not permitted (POSIX.1)

EPFNOSUPPORT    Protocol family not supported

EPIPE           Broken pipe (POSIX.1)

EPROTO          Protocol error (POSIX.1)

EPROTONOSUPPORT Protocol not supported (POSIX.1)

EPROTOTYPE      Protocol wrong type for socket (POSIX.1)

ERANGE          Result too large (POSIX.1, C99)

EREMCHG         Remote address changed

EREMOTE         Object is remote

EREMOTEIO       Remote I/O error

ERESTART        Interrupted system call should be restarted

EROFS           Read-only file system (POSIX.1)

ESHUTDOWN       Cannot send after transport endpoint shutdown

ESPIPE          Invalid seek (POSIX.1)

ESOCKTNOSUPPORT Socket type not supported

ESRCH           No such process (POSIX.1)

ESTALE          Stale file handle (POSIX.1)

                This error can occur for NFS and for other file systems

ESTRPIPE        Streams pipe error

ETIME           Timer expired (POSIX.1 (XSI STREAMS option))

                (POSIX.1 says "STREAM ioctl(2) timeout")

ETIMEDOUT       Connection timed out (POSIX.1)

ETXTBSY         Text file busy (POSIX.1)

EUCLEAN         Structure needs cleaning

EUNATCH         Protocol driver not attached

EUSERS          Too many users

EWOULDBLOCK     Operation would block (may be same value as EAGAIN) (POSIX.1)

EXDEV           Improper link (POSIX.1)

EXFULL          Exchange full


errno.c

标签:

原文地址:http://blog.csdn.net/u011641885/article/details/45291863

(0)
(0)
   
举报
评论 一句话评论(0
登录后才能评论!
© 2014 mamicode.com 版权所有  联系我们:gaon5@hotmail.com
迷上了代码!