strerror(errno)：获取errno对应的错误
#include <string.h> /* for strerror */ #include <errno.h> #include <stdio.h> int main(int argc, char ** argv) { int i = 0; for(i = 0; i < 256; i++) printf("errno.%02d is: %s/n", i, strerror(i)); return 0; }
错误对照表：
errno0 : Success errno1 : Operation not permitted errno2 : No such file or directory errno3 : No such process errno4 : Interrupted system call errno5 : Input/output error errno6 : No such device or address errno7 : Argument list too long errno8 : Exec format error errno9 : Bad file descriptor errno10 : No child processes errno11 : Resource temporarily unavailable errno12 : Cannot allocate memory errno13 : Permission denied errno14 : Bad address errno15 : Block device required errno16 : Device or resource busy errno17 : File exists errno18 : Invalid cross-device link errno19 : No such device errno20 : Not a directory errno21 : Is a directory errno22 : Invalid argument errno23 : Too many open files in system errno24 : Too many open files errno25 : Inappropriate ioctl for device errno26 : Text file busy errno27 : File too large errno28 : No space left on device errno29 : Illegal seek errno30 : Read-only file system errno31 : Too many links errno32 : Broken pipe errno33 : Numerical argument out of domain errno34 : Numerical result out of range errno35 : Resource deadlock avoided errno36 : File name too long errno37 : No locks available errno38 : Function not implemented errno39 : Directory not empty errno40 : Too many levels of symbolic links errno41 : Unknown error 41 errno42 : No message of desired type errno43 : Identifier removed errno44 : Channel number out of range errno45 : Level 2 not synchronized errno46 : Level 3 halted errno47 : Level 3 reset errno48 : Link number out of range errno49 : Protocol driver not attached errno50 : No CSI structure available errno51 : Level 2 halted errno52 : Invalid exchange errno53 : Invalid request descriptor errno54 : Exchange full errno55 : No anode errno56 : Invalid request code errno57 : Invalid slot errno58 : Unknown error 58 errno59 : Bad font file format errno60 : Device not a stream errno61 : No data available errno62 : Timer expired errno63 : Out of streams resources errno64 : Machine is not on the network errno65 : Package not installed errno66 : Object is remote errno67 : Link has been severed errno68 : Advertise error errno69 : Srmount error errno70 : Communication error on send errno71 : Protocol error errno72 : Multihop attempted errno73 : RFS specific error errno74 : Bad message errno75 : Value too large for defined datatype errno76 : Name not unique on network errno77 : File descriptor in bad state errno78 : Remote address changed errno79 : Can not access a needed sharedlibrary errno80 : Accessing a corrupted sharedlibrary errno81 : .lib section in a.out corrupted errno82 : Attempting to link in too manyshared libraries errno83 : Cannot exec a shared librarydirectly errno84 : Invalid or incomplete multibyte orwide character errno85 : Interrupted system call should berestarted errno86 : Streams pipe error errno87 : Too many users errno88 : Socket operation on non-socket errno89 : Destinationaddress required errno90 : Message too long errno91 : Protocol wrong type for socket errno92 : Protocol not available errno93 : Protocol not supported errno94 : Socket type not supported errno95 : Operation not supported errno96 : Protocol family not supported errno97 : Address family not supported byprotocol errno98 : Address already in use errno99 : Cannot assign requested address errno100 : Network is down errno101 : Network is unreachable errno102 : Network dropped connection onreset errno103 : Software caused connection abort errno104 : Connection reset by peer errno105 : No buffer space available errno106 : Transport endpoint is alreadyconnected errno107 : Transport endpoint is notconnected errno108 : Cannot send after transportendpoint shutdown errno109 : Too many references: cannot splice errno110 : Connection timed out errno111 : Connection refused errno112 : Host is down errno113 : No route to host errno114 : Operation already in progress errno115 : Operation now in progress errno116 : Stale NFS file handle errno117 : Structure needs cleaning errno118 : Not a XENIX named type file errno119 : No XENIX semaphores available errno120 : Is a named type file errno121 : Remote I/O error errno122 : Disk quota exceeded errno123 : No medium found errno124 : Wrong medium type errno125 : Operation canceled errno126 : Required key not available errno127 : Key has expired errno128 : Key has been revoked errno129 : Key was rejected by service errno130 : Owner died errno131 : State not recoverable errno132 : Operation not possible due toRF-kill errno133 : Unknown error 133 errno134 : Unknown error 134 errno135 : Unknown error 135 errno136 : Unknown error 136 errno137 : Unknown error 137 errno138 : Unknown error 138 errno139 : Unknown error 139
具体宏定义如下：
头文件 /usr/include/asm-generic/errno-base.h 的源码：
#ifndef _ASM_GENERIC_ERRNO_BASE_H #define _ASM_GENERIC_ERRNO_BASE_H #define EPERM 1 /* Operation not permitted */ #define ENOENT2 /* 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 ENOEXEC8 /* Exec format error */ #define EBADF 9 /* Bad file number */ #define ECHILD10 /* No child processes */ #define EAGAIN11 /* Try again */ #define ENOMEM12 /* Out of memory */ #define EACCES13 /* Permission denied */ #define EFAULT14 /* Bad address */ #define ENOTBLK15 /* Block device required */ #define EBUSY 16 /* Device or resource busy */ #define EEXIST17 /* File exists */ #define EXDEV 18 /* Cross-device link */ #define ENODEV19 /* No such device */ #define ENOTDIR20 /* Not a directory */ #define EISDIR21 /* Is a directory */ #define EINVAL22 /* Invalid argument */ #define ENFILE23 /* File table overflow */ #define EMFILE24 /* Too many open files */ #define ENOTTY25 /* Not a typewriter */ #define ETXTBSY26 /* Text file busy */ #define EFBIG 27 /* File too large */ #define ENOSPC28 /* No space left on device */ #define ESPIPE29 /* Illegal seek */ #define EROFS 30 /* Read-only file system */ #define EMLINK31 /* Too many links */ #define EPIPE 32 /* Broken pipe */ #define EDOM 33 /* Math argument out of domain of func */ #define ERANGE34 /* Math result not representable */ #endif
头文件/usr/include/asm-generic/erno.h源码：
#ifndef _ASM_GENERIC_ERRNO_H #define _ASM_GENERIC_ERRNO_H #include <asm-generic/errno-base.h> #define EDEADLK35 /* Resource deadlock would occur */ #define ENAMETOOLONG36 /* File name too long */ #define ENOLCK37 /* No record locks available */ #define ENOSYS38 /* Function not implemented */ #define ENOTEMPTY39 /* Directory not empty */ #define ELOOP 40 /* Too many symbolic links encountered */ #define EWOULDBLOCKEAGAIN /* Operation would block */ #define ENOMSG42 /* No message of desired type */ #define EIDRM 43 /* Identifier removed */ #define ECHRNG44 /* Channel number out of range */ #define EL2NSYNC45 /* Level 2 not synchronized */ #define EL3HLT46 /* Level 3 halted */ #define EL3RST47 /* Level 3 reset */ #define ELNRNG48 /* Link number out of range */ #define EUNATCH49 /* Protocol driver not attached */ #define ENOCSI50 /* No CSI structure available */ #define EL2HLT51 /* Level 2 halted */ #define EBADE 52 /* Invalid exchange */ #define EBADR 53 /* Invalid request descriptor */ #define EXFULL54 /* Exchange full */ #define ENOANO55 /* No anode */ #define EBADRQC56 /* Invalid request code */ #define EBADSLT57 /* Invalid slot */ #define EDEADLOCKEDEADLK #define EBFONT59 /* Bad font file format */ #define ENOSTR60 /* Device not a stream */ #define ENODATA61 /* No data available */ #define ETIME 62 /* Timer expired */ #define ENOSR 63 /* Out of streams resources */ #define ENONET64 /* Machine is not on the network */ #define ENOPKG65 /* Package not installed */ #define EREMOTE66 /* Object is remote */ #define ENOLINK67 /* Link has been severed */ #define EADV 68 /* Advertise error */ #define ESRMNT69 /* Srmount error */ #define ECOMM 70 /* Communication error on send */ #define EPROTO71 /* Protocol error */ #define EMULTIHOP72 /* Multihop attempted */ #define EDOTDOT73 /* RFS specific error */ #define EBADMSG74 /* Not a data message */ #define EOVERFLOW75 /* Value too large for defined data type */ #define ENOTUNIQ76 /* Name not unique on network */ #define EBADFD77 /* File descriptor in bad state */ #define EREMCHG78 /* Remote address changed */ #define ELIBACC79 /* Can not access a needed shared library */ #define ELIBBAD80 /* Accessing a corrupted shared library */ #define ELIBSCN81 /* .lib section in a.out corrupted */ #define ELIBMAX82 /* Attempting to link in too many shared libraries */ #define ELIBEXEC83 /* Cannot exec a shared library directly */ #define EILSEQ84 /* Illegal byte sequence */ #define ERESTART85 /* Interrupted system call should be restarted */ #define ESTRPIPE86 /* Streams pipe error */ #define EUSERS87 /* Too many users */ #define ENOTSOCK88 /* Socket operation on non-socket */ #define EDESTADDRREQ89 /* Destination address required */ #define EMSGSIZE90 /* Message too long */ #define EPROTOTYPE91 /* Protocol wrong type for socket */ #define ENOPROTOOPT92 /* Protocol not available */ #define EPROTONOSUPPORT93 /* Protocol not supported */ #define ESOCKTNOSUPPORT94 /* Socket type not supported */ #define EOPNOTSUPP95 /* Operation not supported on transport endpoint */ #define EPFNOSUPPORT96 /* Protocol family not supported */ #define EAFNOSUPPORT97 /* Address family not supported by protocol */ #define EADDRINUSE98 /* Address already in use */ #define EADDRNOTAVAIL99 /* Cannot assign requested address */ #define ENETDOWN100 /* Network is down */ #define ENETUNREACH101 /* Network is unreachable */ #define ENETRESET102 /* Network dropped connection because of reset */ #define ECONNABORTED103 /* Software caused connection abort */ #define ECONNRESET104 /* Connection reset by peer */ #define ENOBUFS105 /* No buffer space available */ #define EISCONN106 /* Transport endpoint is already connected */ #define ENOTCONN107 /* Transport endpoint is not connected */ #define ESHUTDOWN108 /* Cannot send after transport endpoint shutdown */ #define ETOOMANYREFS109 /* Too many references: cannot splice */ #define ETIMEDOUT110 /* Connection timed out */ #define ECONNREFUSED111 /* Connection refused */ #define EHOSTDOWN112 /* Host is down */ #define EHOSTUNREACH113 /* No route to host */ #define EALREADY114 /* Operation already in progress */ #define EINPROGRESS115 /* Operation now in progress */ #define ESTALE116 /* Stale NFS file handle */ #define EUCLEAN117 /* Structure needs cleaning */ #define ENOTNAM118 /* Not a XENIX named type file */ #define ENAVAIL119 /* No XENIX semaphores available */ #define EISNAM120 /* Is a named type file */ #define EREMOTEIO121 /* Remote I/O error */ #define EDQUOT122 /* Quota exceeded */ #define ENOMEDIUM123 /* No medium found */ #define EMEDIUMTYPE124 /* Wrong medium type */ #define ECANCELED125 /* Operation Canceled */ #define ENOKEY126 /* Required key not available */ #define EKEYEXPIRED127 /* Key has expired */ #define EKEYREVOKED128 /* Key has been revoked */ #define EKEYREJECTED129 /* Key was rejected by service */ /* for robust mutexes */ #define EOWNERDEAD130 /* Owner died */ #define ENOTRECOVERABLE131 /* State not recoverable */ #define ERFKILL 132/* Operation not possible due to RF-kill */ #endif