とりあえずmanページと，返ってきたエラーコードのみの少ない情報ですが(^^;)
(Fedora9 Kernel:2.6.25)
| 1 | EPERM | Operation not permitted (POSIX.1) |
| 2 | ENOENT | No such file or directory (POSIX.1) |
| 3 | ESRCH | No such process (POSIX.1) |
| 4 | EINTR | Interrupted function call (POSIX.1) |
| 5 | EIO | Input/output error (POSIX.1) |
| 6 | ENXIO | No such device or address (POSIX.1) |
| 7 | E2BIG | Argument list too long (POSIX.1) |
| 8 | ENOEXEC | Exec format error (POSIX.1) |
| 9 | EBADF | Bad file descriptor (POSIX.1) |
| 10 | ECHILD | No child processes (POSIX.1) |
| 11 | EAGAIN | Resource temporarily unavailable (may be the same value as EWOULDBLOCK)(POSIX.1) |
| 11 | EWOULDBLOCK | Operation would block (may be same value as EAGAIN) (POSIX.1) |
| 12 | ENOMEM | Not enough space (POSIX.1) |
| 13 | EACCES | Permission denied (POSIX.1) |
| 14 | EFAULT | Bad address (POSIX.1) |
| 15 | ENOTBLK | Block device required |
| 16 | EBUSY | Device or resource busy (POSIX.1) |
| 17 | EEXIST | File exists (POSIX.1) |
| 18 | EXDEV | Improper link (POSIX.1) |
| 19 | ENODEV | No such device (POSIX.1) |
| 20 | ENOTDIR | Not a directory (POSIX.1) |
| 21 | EISDIR | Is a directory (POSIX.1) |
| 22 | EINVAL | Invalid argument (POSIX.1) |
| 23 | ENFILE | Too many open files in system (POSIX.1) |
| 24 | EMFILE | Too many open files (POSIX.1) |
| 25 | ENOTTY | Inappropriate I/O control operation (POSIX.1) |
| 26 | ETXTBSY | Text file busy (POSIX.1) |
| 27 | EFBIG | File too large (POSIX.1) |
| 28 | ENOSPC | No space left on device (POSIX.1) |
| 29 | ESPIPE | Invalid seek (POSIX.1) |
| 30 | EROFS | Read-only file system (POSIX.1) |
| 31 | EMLINK | Too many links (POSIX.1) |
| 32 | EPIPE | Broken pipe (POSIX.1) |
| 33 | EDOM | Mathematics argument out of domain of function (POSIX.1 |
| 34 | ERANGE | Result too large (POSIX.1 |
| 35 | EDEADLK | Resource deadlock avoided (POSIX.1) |
| 35 | EDEADLOCK | Synonym for EDEADLK |
| 36 | ENAMETOOLONG | Filename too long (POSIX.1) |
| 37 | ENOLCK | No locks available (POSIX.1) |
| 38 | ENOSYS | Function not implemented (POSIX.1) |
| 39 | ENOTEMPTY | Directory not empty (POSIX.1) |
| 40 | ELOOP | Too many levels of symbolic links (POSIX.1) |
| 42 | ENOMSG | No message of the desired type (POSIX.1) |
| 43 | EIDRM | Identifier removed (POSIX.1) |
| 44 | ECHRNG | Channel number out of range |
| 45 | EL2NSYNC | Level 2 not synchronized |
| 46 | EL3HLT | Level 3 halted |
| 47 | EL3RST | Level 3 halted |
| 49 | EUNATCH | Protocol driver not attached |
| 51 | EL2HLT | Level 2 halted |
| 52 | EBADE | Invalid exchange |
| 53 | EBADR | Invalid request descriptor |
| 54 | EXFULL | Exchange full |
| 56 | EBADRQC | Invalid request code |
| 57 | EBADSLT | Invalid slot |
| 60 | ENOSTR | Not a STREAM (POSIX.1 (XSI STREAMS option)) |
| 61 | ENODATA | No message is available on the STREAM head read queue (POSIX.1) |
| 62 | ETIME | Timer expired (POSIX.1 (XSI STREAMS option))(POSIX.1 says STREAM ioctl(2) timeout) |
| 63 | ENOSR | No STREAM resources (POSIX.1 (XSI STREAMS option)) |
| 64 | ENONET | Machine is not on the network |
| 65 | ENOPKG | Package not installed |
| 66 | EREMOTE | Object is remote |
| 67 | ENOLINK | Link has been severed (POSIX.1) |
| 70 | ECOMM | Communication error on send |
| 71 | EPROTO | Protocol error (POSIX.1) |
| 72 | EMULTIHOP | Multihop attempted (POSIX.1) |
| 74 | EBADMSG | Bad message (POSIX.1) |
| 75 | EOVERFLOW | Value too large to be stored in data type (POSIX.1) |
| 76 | ENOTUNIQ | Name not unique on network |
| 77 | EBADFD | File descriptor in bad state |
| 78 | EREMCHG | Remote address changed |
| 79 | ELIBACC | Cannot access a needed shared library |
| 80 | ELIBBAD | Accessing a corrupted shared library |
| 81 | ELIBSCN | lib section in a.out corrupted |
| 82 | ELIBMAX | Attempting to link in too many shared libraries |
| 83 | ELIBEXEC | Cannot exec a shared library directly |
| 84 | EILSEQ | Illegal byte sequence (POSIX.1 |
| 85 | ERESTART | Interrupted system call should be restarted |
| 86 | ESTRPIPE | Streams pipe error |
| 87 | EUSERS | Too many users |
| 88 | ENOTSOCK | Not a socket (POSIX.1) |
| 89 | EDESTADDRREQ | Destination address required (POSIX.1) |
| 90 | EMSGSIZE | Message too long (POSIX.1) |
| 91 | EPROTOTYPE | Protocol wrong type for socket (POSIX.1) |
| 92 | ENOPROTOOPT | Protocol not available (POSIX.1) |
| 93 | EPROTONOSUPPORT | Protocol not supported (POSIX.1) |
| 94 | ESOCKTNOSUPPORT | Socket type not supported |
| 95 | ENOTSUP | Operation not supported (POSIX.1) |
| 95 | EOPNOTSUPP | Operation not supported on socket (POSIX.1)(ENOTSUP and EOPNOTSUPP have the same value on Linux |
| 96 | EPFNOSUPPORT | Protocol family not supported |
| 97 | EAFNOSUPPORT | Address family not supported (POSIX.1) |
| 98 | EADDRINUSE | Address already in use (POSIX.1) |
| 99 | EADDRNOTAVAIL | Address not available (POSIX.1) |
| 100 | ENETDOWN | Network is down (POSIX.1) |
| 101 | ENETUNREACH | Network unreachable (POSIX.1) |
| 102 | ENETRESET | Connection aborted by network (POSIX.1) |
| 103 | ECONNABORTED | Connection aborted (POSIX.1) |
| 104 | ECONNRESET | Connection reset (POSIX.1) |
| 105 | ENOBUFS | No buffer space available (POSIX.1 (XSI STREAMS option)) |
| 106 | EISCONN | Socket is connected (POSIX.1) |
| 107 | ENOTCONN | The socket is not connected (POSIX.1) |
| 108 | ESHUTDOWN | Cannot send after transport endpoint shutdown |
| 110 | ETIMEDOUT | Connection timed out (POSIX.1) |
| 111 | ECONNREFUSED | Connection refused (POSIX.1) |
| 112 | EHOSTDOWN | Host is down |
| 113 | EHOSTUNREACH | Host is unreachable (POSIX.1) |
| 114 | EALREADY | Connection already in progress (POSIX.1) |
| 115 | EINPROGRESS | Operation in progress (POSIX.1) |
| 116 | ESTALE | Stale file handle (POSIX.1) |
| 117 | EUCLEAN | Structure needs cleaning |
| 120 | EISNAM | Is a named type file |
| 121 | EREMOTEIO | Remote I/O error |
| 122 | EDQUOT | Disk quota exceeded (POSIX.1) |
| 123 | ENOMEDIUM | No medium found |
| 124 | EMEDIUMTYPE | Wrong medium type |
| 125 | ECANCELED | Operation canceled (POSIX.1) |
| 126 | ENOKEY | Required key not available |
| 127 | EKEYEXPIRED | Key has expired |
| 128 | EKEYREVOKED | Key has been revoked |
| 129 | EKEYREJECTED | Key was rejected by service |
エラーが起きたときにreturnされる値(-1など)と，errnoって違うんですね．
知らなかったです．
参考ページ：
PC覚え書き | Unix系errno一覧
