errno.h 错误码描述.

描述:一般说的Linux源码的目录,默认是基于 /usr/include/ 的.

　　使用

 char *strerror(int errnum);

　　函数打印错误代码的描述.我简单对比了一下,发现描述大体一致,但有些地方, strerror 函数的描述还稍微详细点.

　　在实际编程中用这一招解决了不少原本看来莫名其妙的问题。比较 麻烦的是每次都要去linux源代码里面查找错误代码的含义，现在把它贴出来，以后需要查时就来这里看了:

　　实现代码:

 #include <string.h>    //for strerror(i)
 #include <stdlib.h>
 #include <stdio.h>

 int
 main(void) {
     int errno;
     for(errno = ; errno <= ; errno++)
         printf("errno.%2d-%s\n", errno, strerror(errno));
     exit();
 }

结果如下:

 errno. -Success
 errno. -Operation not permitted
 errno. -No such file or directory
 errno. -No such process
 errno. -Interrupted system call
 errno. -Input/output error
 errno. -No such device or address
 errno. -Argument list too long
 errno. -Exec format error
 errno. -Bad file descriptor
 errno.-No child processes
 errno.-Resource temporarily unavailable
 errno.-Cannot allocate memory
 errno.-Permission denied
 errno.-Bad address
 errno.-Block device required
 errno.-Device or resource busy
 errno.-File exists
 errno.-Invalid cross-device link
 errno.-No such device
 errno.-Not a directory
 errno.-Is a directory
 errno.-Invalid argument
 errno.-Too many open files in system
 errno.-Too many open files
 errno.-Inappropriate ioctl for device
 errno.-Text file busy
 errno.-File too large
 errno.-No space left on device
 errno.-Illegal seek
 errno.-Read-only file system
 errno.-Too many links
 errno.-Broken pipe
 errno.-Numerical argument out of domain
 errno.-Numerical result out of range
 errno.-Resource deadlock avoided
 errno.-File name too long
 errno.-No locks available
 errno.-Function not implemented
 errno.-Directory not empty
 errno.-Too many levels of symbolic links
 errno.-Unknown error
 errno.-No message of desired type
 errno.-Identifier removed
 errno.-Channel number out of range
 errno.-Level  not synchronized
 errno.-Level  halted
 errno.-Level  reset
 errno.-Link number out of range
 errno.-Protocol driver not attached
 errno.-No CSI structure available
 errno.-Level  halted
 errno.-Invalid exchange
 errno.-Invalid request descriptor
 errno.-Exchange full
 errno.-No anode
 errno.-Invalid request code
 errno.-Invalid slot
 errno.-Unknown error
 errno.-Bad font file format
 errno.-Device not a stream
 errno.-No data available
 errno.-Timer expired
 errno.-Out of streams resources
 errno.-Machine is not on the network
 errno.-Package not installed
 errno.-Object is remote
 errno.-Link has been severed
 errno.-Advertise error
 errno.-Srmount error
 errno.-Communication error on send
 errno.-Protocol error
 errno.-Multihop attempted
 errno.-RFS specific error
 errno.-Bad message
 errno.-Value too large for defined data type
 errno.-Name not unique on network
 errno.-File descriptor in bad state
 errno.-Remote address changed
 errno.-Can not access a needed shared library
 errno.-Accessing a corrupted shared library
 errno.-.lib section in a.out corrupted
 errno.-Attempting to link in too many shared libraries
 errno.-Cannot exec a shared library directly
 errno.-Invalid or incomplete multibyte or wide character
 errno.-Interrupted system call should be restarted
 errno.-Streams pipe error
 errno.-Too many users
 errno.-Socket operation on non-socket
 errno.-Destination address required
 errno.-Message too long
 errno.-Protocol wrong type for socket
 errno.-Protocol not available
 errno.-Protocol not supported
 errno.-Socket type not supported
 errno.-Operation not supported
 errno.-Protocol family not supported
 errno.-Address family not supported by protocol
 errno.-Address already in use
 errno.-Cannot assign requested address
 errno.-Network is down
 errno.-Network is unreachable
 errno.-Network dropped connection on reset
 errno.-Software caused connection abort
 errno.-Connection reset by peer
 errno.-No buffer space available
 errno.-Transport endpoint is already connected
 errno.-Transport endpoint is not connected
 errno.-Cannot send after transport endpoint shutdown
 errno.-Too many references: cannot splice
 errno.-Connection timed out
 errno.-Connection refused
 errno.-Host is down
 errno.-No route to host
 errno.-Operation already in progress
 errno.-Operation now in progress
 errno.-Stale NFS file handle
 errno.-Structure needs cleaning
 errno.-Not a XENIX named type file
 errno.-No XENIX semaphores available
 errno.-Is a named type file
 errno.-Remote I/O error
 errno.-Disk quota exceeded
 errno.-No medium found
 errno.-Wrong medium type
 errno.-Operation canceled
 errno.-Required key not available
 errno.-Key has expired
 errno.-Key has been revoked
 errno.-Key was rejected by service
 errno.-Owner died
 errno.-State not recoverable

　　其中,132及其往后的,都显示unknown error,没有被使用.

　　从 errno.h头文件,向上追溯,发现根据不同的机器,放在不同的头文件. 基本上,这些错误码的具体描述都放在 asm-generic/errno-base.h 和 asm-generic/errno.h 这两个头文件中.

　　这里顺带将这些对应常量列出:

　　　　asm-generic/errno-base.h

    #define EPERM            1      /* Operation not permitted */
   #define ENOENT           2      /* No such file or directory */
   #define ESRCH            3      /* No such process */
   #define EINTR            4      /* Interrupted system call */
   #define EIO              5      /* I/O error */
   #define ENXIO            6      /* No such device or address */
  #define E2BIG            7      /* Argument list too long */
  #define ENOEXEC          8      /* Exec format error */
  #define EBADF            9      /* Bad file number */
  #define ECHILD          10      /* No child processes */
  #define EAGAIN          11      /* Try again */
  #define ENOMEM          12      /* Out of memory */
  #define EACCES          13      /* Permission denied */
  #define EFAULT          14      /* Bad address */
  #define ENOTBLK         15      /* Block device required */
  #define EBUSY           16      /* Device or resource busy */
  #define EEXIST          17      /* File exists */
  #define EXDEV           18      /* Cross-device link */
  #define ENODEV          19      /* No such device */
  #define ENOTDIR         20      /* Not a directory */
  #define EISDIR          21      /* Is a directory */
  #define EINVAL          22      /* Invalid argument */
  #define ENFILE          23      /* File table overflow */
  #define EMFILE          24      /* Too many open files */
  #define ENOTTY          25      /* Not a typewriter */
  #define ETXTBSY         26      /* Text file busy */
  #define EFBIG           27      /* File too large */
  #define ENOSPC          28      /* No space left on device */
  #define ESPIPE          29      /* Illegal seek */
  #define EROFS           30      /* Read-only file system */
  #define EMLINK          31      /* Too many links */
  #define EPIPE           32      /* Broken pipe */
  #define EDOM            33      /* Math argument out of domain of func */
  #define ERANGE          34      /* Math result not representable */

  #endif

　　　　asm-generic/errno.h

   #define DLK            35      /* Resource deadlock would occur */
   #define ENAMETOOLONG    36      /* File name too long */
   #define ENOLCK          37      /* No record locks available */
   #define ENOSYS          38      /* Function not implemented */
  #define ENOTEMPTY       39      /* Directory not empty */
  #define ELOOP           40      /* Too many symbolic links encountered */
  #define EWOULDBLOCK     EAGAIN  /* Operation would block */
  #define ENOMSG          42      /* No message of desired type */
  #define EIDRM           43      /* Identifier removed */
  #define ECHRNG          44      /* Channel number out of range */
  #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 */
  #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

  #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 */
  #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 */
  #define ELIBSCN         81      /* .lib section in a.out corrupted */
  #define ELIBMAX         82      /* Attempting to link in too many shared lib    raries */
  #define ELIBEXEC        83      /* Cannot exec a shared library directly */
  #define EILSEQ          84      /* Illegal byte sequence */
  #define ERESTART        85      /* Interrupted system call should be restart    ed */
  #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 endp    oint */
  #define EPFNOSUPPORT    96      /* Protocol family not supported */
  #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 res    et */
  #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 shut    down */
  #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 */
  #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 */
  #define ECANCELED       125     /* Operation Canceled */
 #define ENOKEY          126     /* Required key not available */
 #define EKEYEXPIRED     127     /* Key has expired */
 #define EKEYREVOKED     128     /* Key has been revoked */
 #define EKEYREJECTED    129     /* Key was rejected by service */

 /* for robust mutexes */
 #define EOWNERDEAD      130     /* Owner died */
 #define ENOTRECOVERABLE 131     /* State not recoverable */

 #define ERFKILL         132     /* Operation not possible due to RF-kill */

 #endif

　　引自: http://blog.csdn.net/kofiory/article/details/5790409