Are you tired of grepping /usr/include to figure out what that system error number means? Here's a handy guide to all the errno values for your system. Use your browser search functionality to find the one you're looking for or just scroll down the table.
You are viewing the error codes for Mac OS X; if you want to view the error codes for a different operating system, select it from the dropdown menu.
# #define Description1 EPERM Operation not permitted2 ENOENT No such file or directory3 ESRCH No such process4 EINTR Interrupted system call5 EIO Input/output error6 ENXIO Device not configured8 ENOEXEC Exec format error9 EBADF Bad file descriptor10 ECHILD No child processes11 EDEADLK Resource deadlock avoided12 ENOMEM Cannot allocate memory13 EACCES Permission denied14 EFAULT Bad address15 ENOTBLK Block device required16 EBUSY Device / Resource busy17 EEXIST File exists18 EXDEV Cross-device link19 ENODEV Operation not supported by device20 ENOTDIR Not a directory21 EISDIR Is a directory22 EINVAL Invalid argument23 ENFILE Too many open files in system24 EMFILE Too many open files25 ENOTTY Inappropriate ioctl for device26 ETXTBSY Text file busy27 EFBIG File too large28 ENOSPC No space left on device29 ESPIPE Illegal seek30 EROFS Read-only file system31 EMLINK Too many links32 EPIPE Broken pipe33 EDOM Numerical argument out of domain34 ERANGE Result too large35 EAGAIN Resource temporarily unavailable35 EWOULDBLOCK Operation would block36 EINPROGRESS Operation now in progress37 EALREADY Operation already in progress38 ENOTSOCK Socket operation on non-socket39 EDESTADDRREQ Destination address required40 EMSGSIZE Message too long41 EPROTOTYPE Protocol wrong type for socket42 ENOPROTOOPT Protocol not available43 EPROTONOSUPPORT Protocol not supported44 ESOCKTNOSUPPORT Socket type not supported45 ENOTSUP Operation not supported45 EOPNOTSUPP Operation not supported on socket46 EPFNOSUPPORT Protocol family not supported47 EAFNOSUPPORT Address family not supported by protocol family48 EADDRINUSE Address already in use49 EADDRNOTAVAIL Can't assign requested address50 ENETDOWN Network is down51 ENETUNREACH Network is unreachable52 ENETRESET Network dropped connection on reset53 ECONNABORTED Software caused connection abort54 ECONNRESET Connection reset by peer55 ENOBUFS No buffer space available56 EISCONN Socket is already connected57 ENOTCONN Socket is not connected58 ESHUTDOWN Can't send after socket shutdown59 ETOOMANYREFS Too many references: can't splice60 ETIMEDOUT Operation timed out61 ECONNREFUSED Connection refused62 ELOOP Too many levels of symbolic links63 ENAMETOOLONG File name too long64 EHOSTDOWN Host is down65 EHOSTUNREACH No route to host66 ENOTEMPTY Directory not empty67 EPROCLIM Too many processes68 EUSERS Too many users69 EDQUOT Disc quota exceeded70 ESTALE Stale NFS file handle71 EREMOTE Too many levels of remote in path72 EBADRPC RPC struct is bad73 ERPCMISMATCH RPC version wrong74 EPROGUNAVAIL RPC prog. not avail75 EPROGMISMATCH Program version wrong76 EPROCUNAVAIL Bad procedure for program77 ENOLCK No locks available78 ENOSYS Function not implemented79 EFTYPE Inappropriate file type or format80 EAUTH Authentication error81 ENEEDAUTH Need authenticator82 EPWROFF Device power is off83 EDEVERR Device error, e.g. paper out84 EOVERFLOW Value too large to be stored in data type85 EBADEXEC Bad executable86 EBADARCH Bad CPU type in executable87 ESHLIBVERS Shared library version mismatch88 EBADMACHO Malformed Macho file89 ECANCELED Operation canceled90 EIDRM Identifier removed91 ENOMSG No message of desired type92 EILSEQ Illegal byte sequence93 ENOATTR Attribute not found94 EBADMSG Bad message95 EMULTIHOP Reserved96 ENODATA No message available on STREAM97 ENOLINK Reserved98 ENOSR No STREAM resources99 ENOSTR Not a STREAM100 EPROTO Protocol error101 ETIME STREAM ioctl timeout102 EOPNOTSUPP Operation not supported on socket103 ENOPOLICY No such policy registered104 ENOTRECOVERABLE State not recoverable105 EOWNERDEAD Previous owner died106 EQFULL Interface output queue is full106 ELAST Must be equal largest errno
To load the error information as JSON, use:
/api/errno/macosx/json
[
{
"const" : "EPERM",
"desc" : "Operation not permitted",
"errno" : 1
},
{
"const" : "ENOENT",
"errno" : 2,
"desc" : "No such file or directory"
},
{
"const" : "ESRCH",
"desc" : "No such process",
"errno" : 3
},
{
"errno" : 4,
"desc" : "Interrupted system call",
"const" : "EINTR"
},
{
"errno" : 5,
"desc" : "Input/output error",
"const" : "EIO"
},
{
"const" : "ENXIO",
"desc" : "Device not configured",
"errno" : 6
},
{
"desc" : "Exec format error",
"errno" : 8,
"const" : "ENOEXEC"
},
{
"const" : "EBADF",
"desc" : "Bad file descriptor",
"errno" : 9
},
{
"const" : "ECHILD",
"desc" : "No child processes",
"errno" : 10
},
{
"errno" : 11,
"desc" : "Resource deadlock avoided",
"const" : "EDEADLK"
},
{
"const" : "ENOMEM",
"desc" : "Cannot allocate memory",
"errno" : 12
},
{
"const" : "EACCES",
"errno" : 13,
"desc" : "Permission denied"
},
{
"const" : "EFAULT",
"errno" : 14,
"desc" : "Bad address"
},
{
"desc" : "Block device required",
"errno" : 15,
"const" : "ENOTBLK"
},
{
"errno" : 16,
"desc" : "Device / Resource busy",
"const" : "EBUSY"
},
{
"const" : "EEXIST",
"errno" : 17,
"desc" : "File exists"
},
{
"const" : "EXDEV",
"errno" : 18,
"desc" : "Cross-device link"
},
{
"desc" : "Operation not supported by device",
"errno" : 19,
"const" : "ENODEV"
},
{
"const" : "ENOTDIR",
"errno" : 20,
"desc" : "Not a directory"
},
{
"desc" : "Is a directory",
"errno" : 21,
"const" : "EISDIR"
},
{
"errno" : 22,
"desc" : "Invalid argument",
"const" : "EINVAL"
},
{
"errno" : 23,
"desc" : "Too many open files in system",
"const" : "ENFILE"
},
{
"const" : "EMFILE",
"errno" : 24,
"desc" : "Too many open files"
},
{
"desc" : "Inappropriate ioctl for device",
"errno" : 25,
"const" : "ENOTTY"
},
{
"desc" : "Text file busy",
"errno" : 26,
"const" : "ETXTBSY"
},
{
"const" : "EFBIG",
"desc" : "File too large",
"errno" : 27
},
{
"const" : "ENOSPC",
"errno" : 28,
"desc" : "No space left on device"
},
{
"errno" : 29,
"desc" : "Illegal seek",
"const" : "ESPIPE"
},
{
"desc" : "Read-only file system",
"errno" : 30,
"const" : "EROFS"
},
{
"const" : "EMLINK",
"errno" : 31,
"desc" : "Too many links"
},
{
"const" : "EPIPE",
"errno" : 32,
"desc" : "Broken pipe"
},
{
"errno" : 33,
"desc" : "Numerical argument out of domain",
"const" : "EDOM"
},
{
"const" : "ERANGE",
"errno" : 34,
"desc" : "Result too large"
},
{
"errno" : 35,
"desc" : "Resource temporarily unavailable",
"const" : "EAGAIN"
},
{
"const" : "EWOULDBLOCK",
"desc" : "Operation would block",
"errno" : 35
},
{
"const" : "EINPROGRESS",
"errno" : 36,
"desc" : "Operation now in progress"
},
{
"desc" : "Operation already in progress",
"errno" : 37,
"const" : "EALREADY"
},
{
"errno" : 38,
"desc" : "Socket operation on non-socket",
"const" : "ENOTSOCK"
},
{
"const" : "EDESTADDRREQ",
"desc" : "Destination address required",
"errno" : 39
},
{
"desc" : "Message too long",
"errno" : 40,
"const" : "EMSGSIZE"
},
{
"const" : "EPROTOTYPE",
"desc" : "Protocol wrong type for socket",
"errno" : 41
},
{
"errno" : 42,
"desc" : "Protocol not available",
"const" : "ENOPROTOOPT"
},
{
"desc" : "Protocol not supported",
"errno" : 43,
"const" : "EPROTONOSUPPORT"
},
{
"errno" : 44,
"desc" : "Socket type not supported",
"const" : "ESOCKTNOSUPPORT"
},
{
"errno" : 45,
"desc" : "Operation not supported",
"const" : "ENOTSUP"
},
{
"desc" : "Operation not supported on socket",
"errno" : 45,
"const" : "EOPNOTSUPP"
},
{
"const" : "EPFNOSUPPORT",
"errno" : 46,
"desc" : "Protocol family not supported"
},
{
"const" : "EAFNOSUPPORT",
"desc" : "Address family not supported by protocol family",
"errno" : 47
},
{
"desc" : "Address already in use",
"errno" : 48,
"const" : "EADDRINUSE"
},
{
"errno" : 49,
"desc" : "Can't assign requested address",
"const" : "EADDRNOTAVAIL"
},
{
"desc" : "Network is down",
"errno" : 50,
"const" : "ENETDOWN"
},
{
"const" : "ENETUNREACH",
"errno" : 51,
"desc" : "Network is unreachable"
},
{
"desc" : "Network dropped connection on reset",
"errno" : 52,
"const" : "ENETRESET"
},
{
"errno" : 53,
"desc" : "Software caused connection abort",
"const" : "ECONNABORTED"
},
{
"const" : "ECONNRESET",
"errno" : 54,
"desc" : "Connection reset by peer"
},
{
"desc" : "No buffer space available",
"errno" : 55,
"const" : "ENOBUFS"
},
{
"desc" : "Socket is already connected",
"errno" : 56,
"const" : "EISCONN"
},
{
"const" : "ENOTCONN",
"errno" : 57,
"desc" : "Socket is not connected"
},
{
"desc" : "Can't send after socket shutdown",
"errno" : 58,
"const" : "ESHUTDOWN"
},
{
"errno" : 59,
"desc" : "Too many references: can't splice",
"const" : "ETOOMANYREFS"
},
{
"const" : "ETIMEDOUT",
"desc" : "Operation timed out",
"errno" : 60
},
{
"const" : "ECONNREFUSED",
"desc" : "Connection refused",
"errno" : 61
},
{
"errno" : 62,
"desc" : "Too many levels of symbolic links",
"const" : "ELOOP"
},
{
"errno" : 63,
"desc" : "File name too long",
"const" : "ENAMETOOLONG"
},
{
"const" : "EHOSTDOWN",
"desc" : "Host is down",
"errno" : 64
},
{
"errno" : 65,
"desc" : "No route to host",
"const" : "EHOSTUNREACH"
},
{
"const" : "ENOTEMPTY",
"errno" : 66,
"desc" : "Directory not empty"
},
{
"const" : "EPROCLIM",
"desc" : "Too many processes",
"errno" : 67
},
{
"desc" : "Too many users",
"errno" : 68,
"const" : "EUSERS"
},
{
"const" : "EDQUOT",
"desc" : "Disc quota exceeded",
"errno" : 69
},
{
"const" : "ESTALE",
"errno" : 70,
"desc" : "Stale NFS file handle"
},
{
"const" : "EREMOTE",
"desc" : "Too many levels of remote in path",
"errno" : 71
},
{
"const" : "EBADRPC",
"errno" : 72,
"desc" : "RPC struct is bad"
},
{
"desc" : "RPC version wrong",
"errno" : 73,
"const" : "ERPCMISMATCH"
},
{
"errno" : 74,
"desc" : "RPC prog. not avail",
"const" : "EPROGUNAVAIL"
},
{
"desc" : "Program version wrong",
"errno" : 75,
"const" : "EPROGMISMATCH"
},
{
"const" : "EPROCUNAVAIL",
"desc" : "Bad procedure for program",
"errno" : 76
},
{
"errno" : 77,
"desc" : "No locks available",
"const" : "ENOLCK"
},
{
"const" : "ENOSYS",
"errno" : 78,
"desc" : "Function not implemented"
},
{
"errno" : 79,
"desc" : "Inappropriate file type or format",
"const" : "EFTYPE"
},
{
"desc" : "Authentication error",
"errno" : 80,
"const" : "EAUTH"
},
{
"errno" : 81,
"desc" : "Need authenticator",
"const" : "ENEEDAUTH"
},
{
"desc" : "Device power is off",
"errno" : 82,
"const" : "EPWROFF"
},
{
"errno" : 83,
"desc" : "Device error, e.g. paper out",
"const" : "EDEVERR"
},
{
"desc" : "Value too large to be stored in data type",
"errno" : 84,
"const" : "EOVERFLOW"
},
{
"desc" : "Bad executable",
"errno" : 85,
"const" : "EBADEXEC"
},
{
"const" : "EBADARCH",
"errno" : 86,
"desc" : "Bad CPU type in executable"
},
{
"errno" : 87,
"desc" : "Shared library version mismatch",
"const" : "ESHLIBVERS"
},
{
"const" : "EBADMACHO",
"errno" : 88,
"desc" : "Malformed Macho file"
},
{
"const" : "ECANCELED",
"desc" : "Operation canceled",
"errno" : 89
},
{
"desc" : "Identifier removed",
"errno" : 90,
"const" : "EIDRM"
},
{
"const" : "ENOMSG",
"errno" : 91,
"desc" : "No message of desired type"
},
{
"desc" : "Illegal byte sequence",
"errno" : 92,
"const" : "EILSEQ"
},
{
"errno" : 93,
"desc" : "Attribute not found",
"const" : "ENOATTR"
},
{
"desc" : "Bad message",
"errno" : 94,
"const" : "EBADMSG"
},
{
"errno" : 95,
"desc" : "Reserved",
"const" : "EMULTIHOP"
},
{
"const" : "ENODATA",
"errno" : 96,
"desc" : "No message available on STREAM"
},
{
"desc" : "Reserved",
"errno" : 97,
"const" : "ENOLINK"
},
{
"const" : "ENOSR",
"errno" : 98,
"desc" : "No STREAM resources"
},
{
"const" : "ENOSTR",
"errno" : 99,
"desc" : "Not a STREAM"
},
{
"const" : "EPROTO",
"desc" : "Protocol error",
"errno" : 100
},
{
"desc" : "STREAM ioctl timeout",
"errno" : 101,
"const" : "ETIME"
},
{
"const" : "EOPNOTSUPP",
"desc" : "Operation not supported on socket",
"errno" : 102
},
{
"const" : "ENOPOLICY",
"errno" : 103,
"desc" : "No such policy registered"
},
{
"const" : "ENOTRECOVERABLE",
"errno" : 104,
"desc" : "State not recoverable"
},
{
"errno" : 105,
"desc" : "Previous owner died",
"const" : "EOWNERDEAD"
},
{
"errno" : 106,
"desc" : "Interface output queue is full",
"const" : "EQFULL"
},
{
"desc" : "Must be equal largest errno",
"errno" : 106,
"const" : "ELAST"
}
]
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