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
1 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:
1 #include <string.h> //for strerror(i) 2 #include <stdlib.h> 3 #include <stdio.h> 4 5 int 6 main(void) { 7 int errno; 8 for(errno = 0; errno <= 256; errno++) 9 printf("errno.%2d-%s\n", errno, strerror(errno)); 10 exit(0); 11 }
结果如下:
1 errno. 0-Success 2 errno. 1-Operation not permitted 3 errno. 2-No such file or directory 4 errno. 3-No such process 5 errno. 4-Interrupted system call 6 errno. 5-Input/output error 7 errno. 6-No such device or address 8 errno. 7-Argument list too long 9 errno. 8-Exec format error 10 errno. 9-Bad file descriptor 11 errno.10-No child processes 12 errno.11-Resource temporarily unavailable 13 errno.12-Cannot allocate memory 14 errno.13-Permission denied 15 errno.14-Bad address 16 errno.15-Block device required 17 errno.16-Device or resource busy 18 errno.17-File exists 19 errno.18-Invalid cross-device link 20 errno.19-No such device 21 errno.20-Not a directory 22 errno.21-Is a directory 23 errno.22-Invalid argument 24 errno.23-Too many open files in system 25 errno.24-Too many open files 26 errno.25-Inappropriate ioctl for device 27 errno.26-Text file busy 28 errno.27-File too large 29 errno.28-No space left on device 30 errno.29-Illegal seek 31 errno.30-Read-only file system 32 errno.31-Too many links 33 errno.32-Broken pipe 34 errno.33-Numerical argument out of domain 35 errno.34-Numerical result out of range 36 errno.35-Resource deadlock avoided 37 errno.36-File name too long 38 errno.37-No locks available 39 errno.38-Function not implemented 40 errno.39-Directory not empty 41 errno.40-Too many levels of symbolic links 42 errno.41-Unknown error 41 43 errno.42-No message of desired type 44 errno.43-Identifier removed 45 errno.44-Channel number out of range 46 errno.45-Level 2 not synchronized 47 errno.46-Level 3 halted 48 errno.47-Level 3 reset 49 errno.48-Link number out of range 50 errno.49-Protocol driver not attached 51 errno.50-No CSI structure available 52 errno.51-Level 2 halted 53 errno.52-Invalid exchange 54 errno.53-Invalid request descriptor 55 errno.54-Exchange full 56 errno.55-No anode 57 errno.56-Invalid request code 58 errno.57-Invalid slot 59 errno.58-Unknown error 58 60 errno.59-Bad font file format 61 errno.60-Device not a stream 62 errno.61-No data available 63 errno.62-Timer expired 64 errno.63-Out of streams resources 65 errno.64-Machine is not on the network 66 errno.65-Package not installed 67 errno.66-Object is remote 68 errno.67-Link has been severed 69 errno.68-Advertise error 70 errno.69-Srmount error 71 errno.70-Communication error on send 72 errno.71-Protocol error 73 errno.72-Multihop attempted 74 errno.73-RFS specific error 75 errno.74-Bad message 76 errno.75-Value too large for defined data type 77 errno.76-Name not unique on network 78 errno.77-File descriptor in bad state 79 errno.78-Remote address changed 80 errno.79-Can not access a needed shared library 81 errno.80-Accessing a corrupted shared library 82 errno.81-.lib section in a.out corrupted 83 errno.82-Attempting to link in too many shared libraries 84 errno.83-Cannot exec a shared library directly 85 errno.84-Invalid or incomplete multibyte or wide character 86 errno.85-Interrupted system call should be restarted 87 errno.86-Streams pipe error 88 errno.87-Too many users 89 errno.88-Socket operation on non-socket 90 errno.89-Destination address required 91 errno.90-Message too long 92 errno.91-Protocol wrong type for socket 93 errno.92-Protocol not available 94 errno.93-Protocol not supported 95 errno.94-Socket type not supported 96 errno.95-Operation not supported 97 errno.96-Protocol family not supported 98 errno.97-Address family not supported by protocol 99 errno.98-Address already in use 100 errno.99-Cannot assign requested address 101 errno.100-Network is down 102 errno.101-Network is unreachable 103 errno.102-Network dropped connection on reset 104 errno.103-Software caused connection abort 105 errno.104-Connection reset by peer 106 errno.105-No buffer space available 107 errno.106-Transport endpoint is already connected 108 errno.107-Transport endpoint is not connected 109 errno.108-Cannot send after transport endpoint shutdown 110 errno.109-Too many references: cannot splice 111 errno.110-Connection timed out 112 errno.111-Connection refused 113 errno.112-Host is down 114 errno.113-No route to host 115 errno.114-Operation already in progress 116 errno.115-Operation now in progress 117 errno.116-Stale NFS file handle 118 errno.117-Structure needs cleaning 119 errno.118-Not a XENIX named type file 120 errno.119-No XENIX semaphores available 121 errno.120-Is a named type file 122 errno.121-Remote I/O error 123 errno.122-Disk quota exceeded 124 errno.123-No medium found 125 errno.124-Wrong medium type 126 errno.125-Operation canceled 127 errno.126-Required key not available 128 errno.127-Key has expired 129 errno.128-Key has been revoked 130 errno.129-Key was rejected by service 131 errno.130-Owner died 132 errno.131-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 */ 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 #define ENOMEM 12 /* 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 */ 38 39 #endif
asm-generic/errno.h
6 #define DLK 35 /* Resource deadlock would occur */ 7 #define ENAMETOOLONG 36 /* File name too long */ 8 #define ENOLCK 37 /* No record locks available */ 9 #define ENOSYS 38 /* Function not implemented */ 10 #define ENOTEMPTY 39 /* Directory not empty */ 11 #define ELOOP 40 /* Too many symbolic links encountered */ 12 #define EWOULDBLOCK EAGAIN /* Operation would block */ 13 #define ENOMSG 42 /* No message of desired type */ 14 #define EIDRM 43 /* Identifier removed */ 15 #define ECHRNG 44 /* Channel number out of range */ 16 #define EL2NSYNC 45 /* Level 2 not synchronized */ 17 #define EL3HLT 46 /* Level 3 halted */ 18 #define EL3RST 47 /* Level 3 reset */ 19 #define ELNRNG 48 /* Link number out of range */ 20 #define EUNATCH 49 /* Protocol driver not attached */ 21 #define ENOCSI 50 /* No CSI structure available */ 22 #define EL2HLT 51 /* Level 2 halted */ 23 #define EBADE 52 /* Invalid exchange */ 24 #define EBADR 53 /* Invalid request descriptor */ 25 #define EXFULL 54 /* Exchange full */ 26 #define ENOANO 55 /* No anode */ 27 #define EBADRQC 56 /* Invalid request code */ 28 #define EBADSLT 57 /* Invalid slot */ 29 30 #define EDEADLOCK EDEADLK 31 32 #define EBFONT 59 /* Bad font file format */ 33 #define ENOSTR 60 /* Device not a stream */ 34 #define ENODATA 61 /* No data available */ 35 #define ETIME 62 /* Timer expired */ 36 #define ENOSR 63 /* Out of streams resources */ 37 #define ENONET 64 /* Machine is not on the network */ 38 #define ENOPKG 65 /* Package not installed */ 39 #define EREMOTE 66 /* Object is remote */ 40 #define ENOLINK 67 /* Link has been severed */ 41 #define EADV 68 /* Advertise error */ 42 #define ESRMNT 69 /* Srmount error */ 43 #define ECOMM 70 /* Communication error on send */ 44 #define EPROTO 71 /* Protocol error */ 45 #define EMULTIHOP 72 /* Multihop attempted */ 46 #define EDOTDOT 73 /* RFS specific error */ 47 #define EBADMSG 74 /* Not a data message */ 48 #define EOVERFLOW 75 /* Value too large for defined data type */ 49 #define ENOTUNIQ 76 /* Name not unique on network */ 50 #define EBADFD 77 /* File descriptor in bad state */ 51 #define EREMCHG 78 /* Remote address changed */ 52 #define ELIBACC 79 /* Can not access a needed shared library */ 53 #define ELIBBAD 80 /* Accessing a corrupted shared library */ 54 #define ELIBSCN 81 /* .lib section in a.out corrupted */ 55 #define ELIBMAX 82 /* Attempting to link in too many shared lib raries */ 56 #define ELIBEXEC 83 /* Cannot exec a shared library directly */ 57 #define EILSEQ 84 /* Illegal byte sequence */ 58 #define ERESTART 85 /* Interrupted system call should be restart ed */ 59 #define ESTRPIPE 86 /* Streams pipe error */ 60 #define EUSERS 87 /* Too many users */ 61 #define ENOTSOCK 88 /* Socket operation on non-socket */ 62 #define EDESTADDRREQ 89 /* Destination address required */ 63 #define EMSGSIZE 90 /* Message too long */ 64 #define EPROTOTYPE 91 /* Protocol wrong type for socket */ 65 #define ENOPROTOOPT 92 /* Protocol not available */ 66 #define EPROTONOSUPPORT 93 /* Protocol not supported */ 67 #define ESOCKTNOSUPPORT 94 /* Socket type not supported */ 68 #define EOPNOTSUPP 95 /* Operation not supported on transport endp oint */ 69 #define EPFNOSUPPORT 96 /* Protocol family not supported */ 70 #define EAFNOSUPPORT 97 /* Address family not supported by protocol */ 71 #define EADDRINUSE 98 /* Address already in use */ 72 #define EADDRNOTAVAIL 99 /* Cannot assign requested address */ 73 #define ENETDOWN 100 /* Network is down */ 74 #define ENETUNREACH 101 /* Network is unreachable */ 75 #define ENETRESET 102 /* Network dropped connection because of res et */ 76 #define ECONNABORTED 103 /* Software caused connection abort */ 77 #define ECONNRESET 104 /* Connection reset by peer */ 78 #define ENOBUFS 105 /* No buffer space available */ 79 #define EISCONN 106 /* Transport endpoint is already connected * / 80 #define ENOTCONN 107 /* Transport endpoint is not connected */ 81 #define ESHUTDOWN 108 /* Cannot send after transport endpoint shut down */ 82 #define ETOOMANYREFS 109 /* Too many references: cannot splice */ 83 #define ETIMEDOUT 110 /* Connection timed out */ 84 #define ECONNREFUSED 111 /* Connection refused */ 85 #define EHOSTDOWN 112 /* Host is down */ 86 #define EHOSTUNREACH 113 /* No route to host */ 87 #define EALREADY 114 /* Operation already in progress */ 88 #define EINPROGRESS 115 /* Operation now in progress */ 89 #define ESTALE 116 /* Stale NFS file handle */ 90 #define EUCLEAN 117 /* Structure needs cleaning */ 91 #define ENOTNAM 118 /* Not a XENIX named type file */ 92 #define ENAVAIL 119 /* No XENIX semaphores available */ 93 #define EISNAM 120 /* Is a named type file */ 94 #define EREMOTEIO 121 /* Remote I/O error */ 95 #define EDQUOT 122 /* Quota exceeded */ 96 97 #define ENOMEDIUM 123 /* No medium found */ 98 #define EMEDIUMTYPE 124 /* Wrong medium type */ 99 #define ECANCELED 125 /* Operation Canceled */ 100 #define ENOKEY 126 /* Required key not available */ 101 #define EKEYEXPIRED 127 /* Key has expired */ 102 #define EKEYREVOKED 128 /* Key has been revoked */ 103 #define EKEYREJECTED 129 /* Key was rejected by service */ 104 105 /* for robust mutexes */ 106 #define EOWNERDEAD 130 /* Owner died */ 107 #define ENOTRECOVERABLE 131 /* State not recoverable */ 108 109 #define ERFKILL 132 /* Operation not possible due to RF-kill */ 110 111 #endif