Popular Errno Codes by Platform

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Popular Errno Codes by Platform

An identifier is defined for platforms that have a numeric value listed (even though there may not be an associated message shown). Column 2 is a score that indicates the fraction of platforms on which the identifier is found (1 meaning all).

	SUSv3		AIX 4.3,5.1		HP-UX 11.22		Solaris 9,10
EPERM	1	0	Operation not permitted.	1	Operation not permitted	1	Not super-user	1
ENOENT	1	0	No such file or directory.	2	No such file or directory	2	No such file or directory	2
ESRCH	1	0	No such process.	3	No such process	3	No such process	3
EINTR	1	0	Interrupted function.	4	interrupted system call	4	interrupted system call	4
EIO	1	0	I/O error.	5	I/O error	5	I/O error	5
ENXIO	1	0	No such device or address.	6	No such device or address	6	No such device or address	6
E2BIG	1	0	Argument list too long.	7	Arg list too long	7	Arg list too long	7
ENOEXEC	1	0	Executable file format error.	8	Exec format error	8	Exec format error	8
EBADF	1	0	Bad file descriptor.	9	Bad file descriptor	9	Bad file number	9
ECHILD	1	0	No child processes.	10	No child processes	10	No children	10
EAGAIN	1	0	Resource unavailable, try again [3]	11	Resource temporarily unavailable	11	No more processes	11
ENOMEM	1	0	Not enough space.	12	Not enough space	12	Not enough core	12
EACCES	1	0	Permission denied.	13	Permission denied	13	Permission denied	13
EFAULT	1	0	Bad address.	14	Bad address	14	Bad address	14
ENOTBLK	0.9			15	Block device required	15	Block device required	15
EBUSY	1	0	Device or resource busy.	16	Resource busy	16	Mount device busy	16
EEXIST	1	0	File exists.	17	File exists	17	File exists	17
EXDEV	1	0	Cross-device link.	18	Improper link	18	Cross-device link	18
ENODEV	1	0	No such device.	19	No such device	19	No such device	19
ENOTDIR	1	0	Not a directory.	20	Not a directory	20	Not a directory	20
EISDIR	1	0	Is a directory.	21	Is a directory	21	Is a directory	21
EINVAL	1	0	Invalid argument.	22	Invalid argument	22	Invalid argument	22
ENFILE	1	0	Too many files open in system.	23	Too many open files in system	23	File table overflow	23
EMFILE	1	0	Too many open files.	24	Too many open files	24	Too many open files	24
ENOTTY	1	0	Inappropriate I/O control operation.	25	Inappropriate I/O control operation	25	Not a typewriter	25
ETXTBSY	1	0	Text file busy.	26	Text file busy	26	Text file busy	26
EFBIG	1	0	File too large.	27	File too large	27	File too large	27
ENOSPC	1	0	No space left on device.	28	No space left on device	28	No space left on device	28
ESPIPE	1	0	Invalid seek.	29	Invalid seek	29	Illegal seek	29
EROFS	1	0	Read-only file system.	30	Read only file system	30	Read only file system	30
EMLINK	1	0	Too many links.	31	Too many links	31	Too many links	31
EPIPE	1	0	Broken pipe.	32	Broken pipe	32	Broken pipe	32
EDOM	0.9	0	Mathematics argument out of domain of function.	33	Domain error within math function			33
ERANGE	0.9	0	Result too large.	34	Result too large			34
ENOMSG	0.9	0	No message of the desired type.	35	No message of desired type	35	No message of desired type	35
EIDRM	0.9	0	Identifier removed.	36	Identifier removed	36	Identifier removed	36
EDEADLK	1	0	Resource deadlock would occur.	45	Resource deadlock avoided	45	A deadlock would occur	45
ENOLCK	1	0	No locks available.	49	No locks available	46	System record lock table was full	46
ESTALE	0.9	0	Reserved.	52	no filesystem	70	Stale NFS file handle	151
EINPROGRESS	0.9	0	Operation in progress.	55	Operation now in progress	245	Operation now in progress	150
EALREADY	0.9	0	Connection already in progress.	56	Operation already in progress	244	Operation already in progress	149
ENOTSOCK	0.9	0	Not a socket.	57	Socket operation on non-socket	216	Socket operation on non-socket	95
EDESTADDRREQ	0.9	0	Destination address required.	58	Destination address required	217	Destination address required	96
EMSGSIZE	0.9	0	Message too large.	59	Message too long	218	Message too long	97
EPROTOTYPE	0.9	0	Protocol wrong type for socket.	60	Protocol wrong type for socket	219	Protocol wrong type for socket	98
ENOPROTOOPT	0.9	0	Protocol not available.	61	Protocol not available	220	Protocol not available	99
EPROTONOSUPPORT	0.9	0	Protocol not supported.	62	Protocol not supported	221	Protocol not supported	120
EOPNOTSUPP	0.9	0	Operation not supported on socket.	64	Operation not supported on socket	223	Operation not supported	122
EAFNOSUPPORT	0.9	0	Address family not supported.	66	Address family not supported by protocol family	225	Address family not supported by protocol family	124
EADDRINUSE	0.9	0	Address in use.	67	Address already in use	226	Address already in use	125
EADDRNOTAVAIL	0.9	0	Address not available.	68	Can't assign requested address	227	Can't assign requested address	126
ENETDOWN	0.9	0	Network is down.	69	Network is down	228	Network is down	127
ENETUNREACH	0.9	0	Network unreachable.	70	Network is unreachable	229	Network is unreachable	128
ENETRESET	0.9	0	Connection aborted by network.	71	Network dropped connection on reset	230	Network dropped connection on reset	129
ECONNABORTED	0.9	0	Connection aborted.	72	Software caused connection abort	231	Software caused connection abort	130
ECONNRESET	0.9	0	Connection reset.	73	Connection reset by peer	232	Connection reset by peer	131
ENOBUFS	0.9	0	No buffer space available.	74	No buffer space available	233	No buffer space available	132
EISCONN	0.9	0	Socket is connected.	75	Socket is already connected	234	Socket is already connected	133
ENOTCONN	0.9	0	The socket is not connected.	76	Socket is not connected	235	Socket is not connected	134
ETIMEDOUT	0.9	0	Connection timed out.	78	Connection timed out	238	Connection timed out	145
ECONNREFUSED	0.9	0	Connection refused.	79	Connection refused	239	Connection refused	146
EHOSTUNREACH	0.9	0	Host is unreachable.	81	No route to host	242	No route to host	148
ELOOP	0.9	0	Too many levels of symbolic links.	85	Too many levels of symbolic links	249	Too many levels of symbolic links	90
ENAMETOOLONG	1	0	Filename too long.	86	File name too long	248	File name too long	78
ENOTEMPTY	1	0	Directory not empty.	87	Directory not empty [1]	247	Directory not empty	93
ENOSYS	1	0	Function not supported.	109	Function not implemented POSIX	251	Function not implemented	89
EILSEQ	1	0	Illegal byte sequence.	116	Invalid wide character	47	Illegal byte sequence	88
EOVERFLOW	0.9	0	Value too large to be stored in data type.	127	value too large to be stored in data type	72	Value too large to be stored in data type	79

	Linux 2.4.28,2.6.9		IRIX 6.5[4]		OSF1		FreeBSD 5.2.1
EPERM	Not super-user	1	Operation not permitted	1	Operation not permitted	1	Not owner	1
ENOENT	No such file or directory	2	No such file or directory	2	No such file or directory	2	No such file or directory	2
ESRCH	No such process	3	No such process	3	No such process	3	No such process	3
EINTR	interrupted system call	4	Interrupted system call	4	Interrupted function call	4	Interrupted system call	4
EIO	I/O error	5	I/O error	5	I/O error	5	I/O error	5
ENXIO	No such device or address	6	No such device or address	6	No such device or address	6	No such device or address	6
E2BIG	Arg list too long	7	Arg list too long	7	Arg list too long	7	Arg list too long	7
ENOEXEC	Exec format error	8	Exec format error	8	Exec format error	8	Exec format error	8
EBADF	Bad file number	9	Bad file number	9	Bad file number	9	Bad file number	9
ECHILD	No children	10	No child processes	10	No child processes	10	No children	10
EAGAIN	Resource temporarily unavailable	11	Try again	11	Resource temporarily unavailable	11	ditto	35
ENOMEM	Not enough core	12	Out of memory	12	Not enough space	12	Not enough core	12
EACCES	Permission denied	13	Permission denied	13	Permission denied	13	Permission denied	13
EFAULT	Bad address	14	Bad address	14	Bad address	14	Bad address	14
ENOTBLK	Block device required	15	Block device required	15	Block device required	15	Block device required	15
EBUSY	Mount device busy	16	Device or resource busy	16	Resource busy	16	Mount device busy	16
EEXIST	File exists	17	File exists	17	File exists	17	File exists	17
EXDEV	Cross-device link	18	Cross-device link	18	Improper link	18	Cross-device link	18
ENODEV	No such device	19	No such device	19	No such device	19	No such device	19
ENOTDIR	Not a directory	20	Not a directory	20	Not a directory	20	Not a directory	20
EISDIR	Is a directory	21	Is a directory	21	Is a directory	21	Is a directory	21
EINVAL	Invalid argument	22	Invalid argument	22	Invalid argument	22	Invalid argument	22
ENFILE	File table overflow	23	File table overflow	23	File table overflow	23	File table overflow	23
EMFILE	Too many open files	24	Too many open files	24	Too many open files	24	Too many open files	24
ENOTTY	Inappropriate ioctl for device	25	Not a typewriter	25	Inappropriate I/O control operation	25	Not a typewriter	25
ETXTBSY	Text file busy	26	Text file busy	26	Text file busy	26	Text file busy	26
EFBIG	File too large	27	File too large	27	File too large	27	File too large	27
ENOSPC	No space left on device	28	No space left on device	28	No space left on device	28	No space left on device	28
ESPIPE	Illegal seek	29	Illegal seek	29	Illegal seek	29	Illegal seek	29
EROFS	Read only file system	30	Read-only file system	30	Read only file system	30	Read-only file system	30
EMLINK	Too many links	31	Too many links	31	Too many links	31	Too many links	31
EPIPE	Broken pipe	32	Broken pipe	32	Broken pipe	32	Broken pipe	32
EDOM	Math arg out of domain of func	33	Math argument out of domain of func	33	Domain error	33	Argument too large	33
ERANGE	Math result not representable	34	Math result not representable	34	Result too large	34	Result too large	34
ENOMSG	No message of desired type	42	No message of desired type	35	No message of desired type	80	No msg matches receive request	83
EIDRM	Identifier removed	43	Identifier removed	36	Identifier removed	81	Msg queue id has been removed	82
EDEADLK	Deadlock condition.	35	Resource deadlock would occur	45	Resource deadlock avoided	11	Operation would cause deadlock	11
ENOLCK	No record locks available.	37	No record locks available	46	No locks available	77	No locks available	77
ESTALE	Stale NFS file handle	116	Stale NFS file handle	151	Stale NFS file handle	70	Stale NFS file handle	70
EINPROGRESS	operation now in progress	115	Operation now in progress	150	operation now in progress	36	Operation now in progress	36
EALREADY	operation already in progress	114	Operation already in progress	149	operation already in progress	37	Operation already in progress	37
ENOTSOCK	Socket operation on non-socket	88	Socket operation on non-socket	95	Socket operation on non-socket	38	Socket operation on non-socket	38
EDESTADDRREQ	Destination address required	89	Destination address required	96	Destination address required	39	Destination address required	39
EMSGSIZE	Message too long	90	Message too long	97	Inappropriate message buffer length	40	Message too long	40
EPROTOTYPE	Protocol wrong type for socket	91	Protocol wrong type for socket	98	Protocol wrong type for socket	41	Protocol wrong type for socket	41
ENOPROTOOPT	Protocol not available	92	Protocol not available	99	Protocol not available	42	Protocol not available	42
EPROTONOSUPPORT	Protocol not supported	93	Protocol not supported	120	Protocol not supported	43	Protocol not supported	43
EOPNOTSUPP	Operation not supported on socket	95	Operation not supported on transport endpoint	122	Operation not supported on socket	45	Operation not supported on socket	45
EAFNOSUPPORT	Address family not supported by	97	Address family not supported by protocol	124	Address family not supported by	47	Address family not supported by protocol family	47
EADDRINUSE	Address already in use	98	Address already in use	125	Address already in use	48	Address already in use	48
EADDRNOTAVAIL	Can't assign requested address	99	Cannot assign requested address	126	Can't assign requested address	49	Can't assign requested address	49
ENETDOWN	Network is down	100	Network is down	127	Network is down	50	Network is down	50
ENETUNREACH	Network is unreachable	101	Network is unreachable	128	Network is unreachable	51	Network is unreachable	51
ENETRESET	Network dropped connection because	102	Network dropped connection because of reset	129	Network dropped connection because	52	Network dropped connection on reset	52
ECONNABORTED	Software caused connection abort	103	Software caused connection abort	130	Software caused connection abort	53	Software caused connection abort	53
ECONNRESET	Connection reset by peer	104	Connection reset by peer	131	Connection reset by peer	54	Connection reset by peer	54
ENOBUFS	No buffer space available	105	No buffer space available	132	No buffer space available	55	No buffer space available	55
EISCONN	Socket is already connected	106	Transport endpoint is already connected	133	Socket is already connected	56	Socket is already connected	56
ENOTCONN	Socket is not connected	107	Transport endpoint is not connected	134	Socket is not connected	57	Socket is not connected	57
ETIMEDOUT	Connection timed out	110	Connection timed out	145	Connection timed out	60	Connection timed out	60
ECONNREFUSED	Connection refused	111	Connection refused	146	Connection refused	61	Connection refused	61
EHOSTUNREACH	No route to host	113	No route to host	148	No route to host	65	No route to host	65
ELOOP	Symbolic link loop	40	Too many symbolic links encountered	90	Symbolic link loop	62	Too many levels of symbolic links	62
ENAMETOOLONG	path name is too long	36	File name too long	78	Filename too long	63	File name too long	63
ENOTEMPTY	directory not empty	39	Directory not empty	93	Directory not empty	66	Directory not empty	66
ENOSYS	Unsupported file system operation	38	Function not implemented	89	Function not implemented	78	Function not implemented	78
EILSEQ	Illegal byte sequence.	84	Illegal byte sequence	88	Illegal byte sequence.	116	Invalid wide character	86
EOVERFLOW	value too large to be stored in data type	75	Value too large for defined data type	79	value too large to be stored in data type	103	Value too large to be stored in data type [5]	84

	OSX 10.3.8		MSVC6
EPERM	Operation not permitted	1	Operation not permitted	1	Operation not permitted
ENOENT	No such file or directory	2	No such file or directory	2	No such file or directory
ESRCH	No such process	3	No such process	3	No such process
EINTR	Interrupted system call	4	Interrupted system call	4	Interrupted function call
EIO	Input/output error	5	Input/output error	5	Input/output error
ENXIO	Device not configured	6	Device not configured	6	No such device or address
E2BIG	Argument list too long	7	Argument list too long	7	Arg list too long
ENOEXEC	Exec format error	8	Exec format error	8	Exec format error
EBADF	Bad file descriptor	9	Bad file descriptor	9	Bad file descriptor
ECHILD	No child processes	10	No child processes	10	No child processes
EAGAIN	Resource temporarily unavailable	35	Resource temporarily unavailable	11	Resource temporarily unavailable
ENOMEM	Cannot allocate memory	12	Cannot allocate memory	12	Not enough space
EACCES	Permission denied	13	Permission denied	13	Permission denied
EFAULT	Bad address	14	Bad address	14	Bad address
ENOTBLK	Block device required	15	Block device required	15	Unknown error
EBUSY	Device busy	16	Device busy	16	Resource device
EEXIST	File exists	17	File exists	17	File exists
EXDEV	Cross-device link	18	Cross-device link	18	Improper link
ENODEV	Operation not supported by device	19	Operation not supported by device	19	No such device
ENOTDIR	Not a directory	20	Not a directory	20	Not a directory
EISDIR	Is a directory	21	Is a directory	21	Is a directory
EINVAL	Invalid argument	22	Invalid argument	22	Invalid argument
ENFILE	Too many open files in system	23	Too many open files in system	23	Too many open files in system
EMFILE	Too many open files	24	Too many open files	24	Too many open files
ENOTTY	Inappropriate ioctl for device	25	Inappropriate ioctl for device	25	Inappropriate I/O control operation
ETXTBSY	Text file busy	26	Text file busy	26	Unknown error
EFBIG	File too large	27	File too large	27	File too large
ENOSPC	No space left on device	28	No space left on device	28	No space left on device
ESPIPE	Illegal seek	29	Illegal seek	29	Invalid seek
EROFS	Read-only filesystem	30	Read-only file system	30	Read-only file system
EMLINK	Too many links	31	Too many links	31	Too many links
EPIPE	Broken pipe	32	Broken pipe	32	Broken pipe
EDOM	Numerical argument out of domain	33	Numerical argument out of domain	33	Domain error
ERANGE	Result too large	34	Result too large	34	Result too large
ENOMSG	No message of desired type	91	No message of desired type
EIDRM	Identifier removed	90	Identifier removed
EDEADLK	Resource deadlock avoided [5]	11	Resource deadlock avoided	36	Resource deadlock avoided
ENOLCK	No locks available	77	No locks available	39	No locks available
ESTALE	Stale NFS file handle	70	Stale NFS file handle
EINPROGRESS	Operation now in progress	36	Operation now in progress
EALREADY	Operation already in progress	37	Operation already in progress
ENOTSOCK	Socket operation on non-socket	38	Socket operation on non-socket
EDESTADDRREQ	Destination address required	39	Destination address required
EMSGSIZE	Message too long	40	Message too long
EPROTOTYPE	Protocol wrong type for socket	41	Protocol wrong type for socket
ENOPROTOOPT	Protocol not available	42	Protocol not available
EPROTONOSUPPORT	Protocol not supported	43	Protocol not supported
EOPNOTSUPP	Operation not supported	45	Operation not supported
EAFNOSUPPORT	Address family not supported by protocol family	47	Address family not supported by protocol family
EADDRINUSE	Address already in use	48	Address already in use
EADDRNOTAVAIL	Can't assign requested address	49	Can't assign requested address
ENETDOWN	Network is down	50	Network is down
ENETUNREACH	Network is unreachable	51	Network is unreachable
ENETRESET	Network dropped connection on reset	52	Network dropped connection on reset
ECONNABORTED	Software caused connection abort	53	Software caused connection abort
ECONNRESET	Connection reset by peer	54	Connection reset by peer
ENOBUFS	No buffer space available	55	No buffer space available
EISCONN	Socket is already connected	56	Socket is already connected
ENOTCONN	Socket is not connected	57	Socket is not connected
ETIMEDOUT	Operation timed out	60	Operation timed out
ECONNREFUSED	Connection refused	61	Connection refused
EHOSTUNREACH	No route to host	65	No route to host
ELOOP	Too many levels of symbolic links	62	Too many levels of symbolic links
ENAMETOOLONG	File name too long	63	File name too long	38	Filename too long
ENOTEMPTY	Directory not empty	66	Directory not empty	41	Directory not empty
ENOSYS	Function not implemented	78	Function not implemented	40	Function not implemented
EILSEQ	Illegal byte sequence	92	Illegal byte sequence	42	Illegal byte sequence
EOVERFLOW	Value too large to be stored in data type	84	Value too large to be stored in data type

[2] AIX EWOULDBLOCK is 11 "Operation would block" if _XOPEN_SOURCE_EXTENDED is 1 meaning SUS UNIX95
[3] SUSv3 states EAGAIN "Resource unavailable, try again" may be the same value as EWOULDBLOCK and indeed many of the platforms listed here have the same value.
[4] IRIX error codes > 256 omitted
[5] FreeBSD EDEADLK 11 "Resource deadlock avoided" used to be EAGAIN
[6] Linux does not have ECANCELED so it is defined to the invlid code 125
[*] HP-UX must define EDOM and ERANGE somewhere as they are ANSI C. I have to investigate why they weren't defined in the main errno header

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