檢視錯誤程式碼errno是除錯程式的一個重要方法。當linuc C api函式發生異常時,一般會將errno變數(需include errno.h)賦一個整數值,不同的值表示不同的含義,可以透過檢視該值推測出錯的原因。在實際程式設計中用這一招解決了不少原本看來莫名其妙的問題。比較麻煩的是每次都要去linux原始碼裡面查詢錯誤程式碼的含義，現在把它貼出來，以後需要查時就來這裡看了。

1-34號錯誤號是在核心原始碼的include/asm-generic/errno-base.h定義

35-132則是在include/asm-generic/errno.h中定義

剩下還有一些更大的錯誤號是留給核心級別的，如系統呼叫等，使用者程式一般是看不見的這些號的，Ubuntu9.10中/usr/src/linux-headers-2.6.31-21-generic/include/linux/errno.h

#ifndef _ASM_GENERIC_ERRNO_BASE_H

#define _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

#include <asm-generic/errno-base.h>

#define EDEADLK 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 libraries ＊/

#define ELIBEXEC 83 /＊ Cannot exec a shared library directly ＊/

#define EILSEQ 84 /＊ Illegal byte sequence ＊/

#define ERESTART 85 /＊ Interrupted system call should be restarted ＊/

#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 endpoint ＊/

#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 reset ＊/

#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 shutdown ＊/

#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 ＊/

#ifdef __KERNEL__

/＊

＊ These should never be seen by user programs. To return one of ERESTART＊

＊ codes, signal_pending() MUST be set. Note that ptrace can observe these

＊ at syscall exit tracing, but they will never be left for the debugged user

＊ process to see.

＊/

#define ERESTARTSYS 512

#define ERESTARTNOINTR 513

#define ERESTARTNOHAND 514 /＊ restart if no handler.. ＊/

#define ENOIOCTLCMD 515 /＊ No ioctl command ＊/

#define ERESTART_RESTARTBLOCK 516 /＊ restart by calling sys_restart_syscall ＊/

/＊ Defined for the NFSv3 protocol ＊/

#define EBADHANDLE 521 /＊ Illegal NFS file handle ＊/

#define ENOTSYNC 522 /＊ Update synchronization mismatch ＊/

#define EBADCOOKIE 523 /＊ Cookie is stale ＊/

#define ENOTSUPP 524 /＊ Operation is not supported ＊/

#define ETOOSMALL 525 /＊ Buffer or request is too small ＊/

#define ESERVERFAULT 526 /＊ An untranslatable error occurred ＊/

#define EBADTYPE 527 /＊ Type not supported by server ＊/

#define EJUKEBOX 528 /＊ Request initiated, but will not complete before timeout ＊/

#define EIOCBQUEUED 529 /＊ iocb queued, will get completion event ＊/

#define EIOCBRETRY 530 /＊ iocb queued, will trigger a retry ＊/

#endif

LINUX errno大全

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