errno 在 <errno.h> 中定义，错误 Exx 的宏定义在 /usr/include/asm-generic 文件夹下面的 errno-base.h 和 errno.h，分别定义了 1-34 、35-132 的错误定义。
strerror() 函数依据 errno 值返回错误描述字符串，下面程序打印对照表：
#include <errno.h>
#include <string.h>
#include <stdio.h>
int main()
{
int i;
for(i = 0; i < 140; ++i)
{
errno = i;
printf("errno %d :\t\t%s\n",i,strerror(errno));
}
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
由上可见Linux对错误宏的定义。
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
#defineEPERM 1/* Operation not permitted */#defineENOENT2/* No such file or directory */#defineESRCH 3/* No such process */#defineEINTR 4/* Interrupted system call */#defineEIO 5/* I/O error */#defineENXIO 6/* No such device or address */#defineE2BIG 7/* Argument list too long */#defineENOEXEC8/* Exec format error */#defineEBADF 9/* Bad file number */#defineECHILD10/* No child processes */#defineEAGAIN11/* Try again */#defineENOMEM12/* Out of memory */#defineEACCES13/* Permission denied */#defineEFAULT14/* Bad address */#defineENOTBLK15/* Block device required */#defineEBUSY 16/* Device or resource busy */#defineEEXIST17/* File exists */#defineEXDEV 18/* Cross-device link */#defineENODEV19/* No such device */#defineENOTDIR20/* Not a directory */#defineEISDIR21/* Is a directory */#defineEINVAL22/* Invalid argument */#defineENFILE23/* File table overflow */#defineEMFILE24/* Too many open files */#defineENOTTY25/* Not a typewriter */#defineETXTBSY26/* Text file busy */#defineEFBIG 27/* File too large */#defineENOSPC28/* No space left on device */#defineESPIPE29/* Illegal seek */#defineEROFS 30/* Read-only file system */#defineEMLINK31/* Too many links */#defineEPIPE 32/* Broken pipe */#defineEDOM 33/* Math argument out of domain of func */#defineERANGE34/* 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>
#defineEDEADLK35/* Resource deadlock would occur */#defineENAMETOOLONG36/* File name too long */#defineENOLCK37/* No record locks available */#defineENOSYS38/* Function not implemented */#defineENOTEMPTY39/* Directory not empty */#defineELOOP 40/* Too many symbolic links encountered */#defineEWOULDBLOCKEAGAIN/* Operation would block */#defineENOMSG42/* No message of desired type */#defineEIDRM 43/* Identifier removed */#defineECHRNG44/* Channel number out of range */#defineEL2NSYNC45/* Level 2 not synchronized */#defineEL3HLT46/* Level 3 halted */#defineEL3RST47/* Level 3 reset */#defineELNRNG48/* Link number out of range */#defineEUNATCH49/* Protocol driver not attached */#defineENOCSI50/* No CSI structure available */#defineEL2HLT51/* Level 2 halted */#defineEBADE 52/* Invalid exchange */#defineEBADR 53/* Invalid request descriptor */#defineEXFULL54/* Exchange full */#defineENOANO55/* No anode */#defineEBADRQC56/* Invalid request code */#defineEBADSLT57/* Invalid slot */
#defineEDEADLOCKEDEADLK
#defineEBFONT59/* Bad font file format */#defineENOSTR60/* Device not a stream */#defineENODATA61/* No data available */#defineETIME 62/* Timer expired */#defineENOSR 63/* Out of streams resources */#defineENONET64/* Machine is not on the network */#defineENOPKG65/* Package not installed */#defineEREMOTE66/* Object is remote */#defineENOLINK67/* Link has been severed */#defineEADV 68/* Advertise error */#defineESRMNT69/* Srmount error */#defineECOMM 70/* Communication error on send */#defineEPROTO71/* Protocol error */#defineEMULTIHOP72/* Multihop attempted */#defineEDOTDOT73/* RFS specific error */#defineEBADMSG74/* Not a data message */#defineEOVERFLOW75/* Value too large for defined data type */#defineENOTUNIQ76/* Name not unique on network */#defineEBADFD77/* File descriptor in bad state */#defineEREMCHG78/* Remote address changed */#defineELIBACC79/* Can not access a needed shared library */#defineELIBBAD80/* Accessing a corrupted shared library */#defineELIBSCN81/* .lib section in a.out corrupted */#defineELIBMAX82/* Attempting to link in too many shared libraries */#defineELIBEXEC83/* Cannot exec a shared library directly */#defineEILSEQ84/* Illegal byte sequence */#defineERESTART85/* Interrupted system call should be restarted */#defineESTRPIPE86/* Streams pipe error */#defineEUSERS87/* Too many users */#defineENOTSOCK88/* Socket operation on non-socket */#defineEDESTADDRREQ89/* Destination address required */#defineEMSGSIZE90/* Message too long */#defineEPROTOTYPE91/* Protocol wrong type for socket */#defineENOPROTOOPT92/* Protocol not available */#defineEPROTONOSUPPORT93/* Protocol not supported */#defineESOCKTNOSUPPORT94/* Socket type not supported */#defineEOPNOTSUPP95/* Operation not supported on transport endpoint */#defineEPFNOSUPPORT96/* Protocol family not supported */#defineEAFNOSUPPORT97/* Address family not supported by protocol */#defineEADDRINUSE98/* Address already in use */#defineEADDRNOTAVAIL99/* Cannot assign requested address */#defineENETDOWN100/* Network is down */#defineENETUNREACH101/* Network is unreachable */#defineENETRESET102/* Network dropped connection because of reset */#defineECONNABORTED103/* Software caused connection abort */#defineECONNRESET104/* Connection reset by peer */#defineENOBUFS105/* No buffer space available */#defineEISCONN106/* Transport endpoint is already connected */#defineENOTCONN107/* Transport endpoint is not connected */#defineESHUTDOWN108/* Cannot send after transport endpoint shutdown */#defineETOOMANYREFS109/* Too many references: cannot splice */#defineETIMEDOUT110/* Connection timed out */#defineECONNREFUSED111/* Connection refused */#defineEHOSTDOWN112/* Host is down */#defineEHOSTUNREACH113/* No route to host */#defineEALREADY114/* Operation already in progress */#defineEINPROGRESS115/* Operation now in progress */#defineESTALE116/* Stale NFS file handle */#defineEUCLEAN117/* Structure needs cleaning */#defineENOTNAM118/* Not a XENIX named type file */#defineENAVAIL119/* No XENIX semaphores available */#defineEISNAM120/* Is a named type file */#defineEREMOTEIO121/* Remote I/O error */#defineEDQUOT122/* Quota exceeded */
#defineENOMEDIUM123/* No medium found */#defineEMEDIUMTYPE124/* Wrong medium type */#defineECANCELED125/* Operation Canceled */#defineENOKEY126/* Required key not available */#defineEKEYEXPIRED127/* Key has expired */#defineEKEYREVOKED128/* Key has been revoked */#defineEKEYREJECTED129/* Key was rejected by service */
/* for robust mutexes */#defineEOWNERDEAD130/* Owner died */#defineENOTRECOVERABLE131/* State not recoverable */
#define ERFKILL132/* Operation not possible due to RF-kill */
#endif
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