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