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[memo] errnoを調べる

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はじめに


  • 個人的なメモです

  • C言語でプログラムを組む場合や、何かのコマンドのエラーメッセージなどで、errnoの値を知りたい場合や、逆に値に対応するエラー内容を知りたい時があると思う

  • そんな時、はるか n 年前に作った簡単なシェルスクリプトで調べたりする

  • どんな環境でも動くかどうかとか、全部の errno を調べられるかとか、難しいことは考えてない(動かなかったときに考えればよい)

  • とりあえず、Amazon Linux (あるいは CentOS)あたりに gcc を入れてある環境で動かした版


スクリプト


errno.sh

#!/bin/bash

if [ $# -ne 1 -o "$1" = "-h" -o "$1" = "--help" ]
then
echo "Usage: $(basename $0) { ERROR_NUMBER | ERROR_NAME }" >&2
exit 1

elif [[ ! ( "$1" =~ ^E[A-Z0-9]+$ || "$1" =~ ^[1-9][0-9]*$ ) ]]
then
echo "illegal argument." >&2
exit 1

elif ! find /usr/include -name 'errno*.h' |
xargs -r grep -Eh \
-e "^\\s*#\\s*define\\s+E[A-Z0-9]+\\s+$1\\>" \
-e "^\\s*#\\s*define\\s+$1\\s+[1-9][0-9]*\\>" \
-e "^\\s*#\\s*define\\s+$1\\s+E[A-Z0-9]+\\>"
then
echo "errno not found($1)." >&2
exit 1
fi


$ errno.sh

Usage: errno.sh { ERROR_NUMBER | ERROR_NAME }
$ errno.sh EIO
#define EIO 5 /* I/O error */
$ errno.sh 125
#define ECANCELED 125 /* Operation Canceled */


メモ(Linuxの場合)


errnoの範囲

$ for A in $(seq 1 140) ; do errno.sh $A ; done

#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 EDOM 33 /* Math argument out of domain of function. */
#define ERANGE 34 /* Math result not representable */
# define ERANGE 34 /* Math result not representable. */
#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 */
errno not found(41).
#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 */
errno not found(58).
#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 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 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 ECANCELED 125
#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 */
#define EOWNERDEAD 130 /* Owner died */
# define EOWNERDEAD 130
#define ENOTRECOVERABLE 131 /* State not recoverable */
# define ENOTRECOVERABLE 131
#define ERFKILL 132 /* Operation not possible due to RF-kill */
# define ERFKILL 132
#define EHWPOISON 133 /* Memory page has hardware error */
# define EHWPOISON 133
errno not found(134).
errno not found(135).
errno not found(136).
errno not found(137).
errno not found(138).
errno not found(139).
errno not found(140).
$


名前が複数あるerrno

$ errno.sh EDEADLK

#define EDEADLK 35 /* Resource deadlock would occur */
#define EDEADLOCK EDEADLK
$ errno.sh EAGAIN
#define EAGAIN 11 /* Try again */
#define EWOULDBLOCK EAGAIN /* Operation would block */
$ errno.sh EOPNOTSUPP
#define EOPNOTSUPP 95 /* Operation not supported on transport endpoint */
# define ENOTSUP EOPNOTSUPP