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 Linux 2.4.28,2.6.9 IRIX 6.5[4] OSF1 FreeBSD 5.2.1 OSX 10.3.8 MSVC6
EPERM 1 0 Operation not permitted. 1 Operation not permitted 1 Not super-user 1 Not super-user 1 Operation not permitted 1 Operation not permitted 1 Not owner 1 Operation not permitted 1 Operation not permitted 1 Operation not permitted
ENOENT 1 0 No such file or directory. 2 No such file or directory 2 No such file or directory 2 No such file or directory 2 No such file or directory 2 No such file or directory 2 No such file or directory 2 No such file or directory 2 No such file or directory 2 No such file or directory
ESRCH 1 0 No such process. 3 No such process 3 No such process 3 No such process 3 No such process 3 No such process 3 No such process 3 No such process 3 No such process 3 No such process
EINTR 1 0 Interrupted function. 4 interrupted system call 4 interrupted system call 4 interrupted system call 4 Interrupted system call 4 Interrupted function call 4 Interrupted system call 4 Interrupted system call 4 Interrupted system call 4 Interrupted function call
EIO 1 0 I/O error. 5 I/O error 5 I/O error 5 I/O error 5 I/O error 5 I/O error 5 I/O error 5 Input/output error 5 Input/output error 5 Input/output error
ENXIO 1 0 No such device or address. 6 No such device or address 6 No such device or address 6 No such device or address 6 No such device or address 6 No such device or address 6 No such device or address 6 Device not configured 6 Device not configured 6 No such device or address
E2BIG 1 0 Argument list too long. 7 Arg list too long 7 Arg list too long 7 Arg list too long 7 Arg list too long 7 Arg list too long 7 Arg list too long 7 Argument list too long 7 Argument list too long 7 Arg list too long
ENOEXEC 1 0 Executable file format error. 8 Exec format error 8 Exec format error 8 Exec format error 8 Exec format error 8 Exec format error 8 Exec format error 8 Exec format error 8 Exec format error 8 Exec format error
EBADF 1 0 Bad file descriptor. 9 Bad file descriptor 9 Bad file number 9 Bad file number 9 Bad file number 9 Bad file number 9 Bad file number 9 Bad file descriptor 9 Bad file descriptor 9 Bad file descriptor
ECHILD 1 0 No child processes. 10 No child processes 10 No children 10 No children 10 No child processes 10 No child processes 10 No children 10 No child processes 10 No child processes 10 No child processes
EAGAIN 1 0 Resource unavailable, try again [3] 11 Resource temporarily unavailable 11 No more processes 11 Resource temporarily unavailable 11 Try again 11 Resource temporarily unavailable 11 ditto 35 Resource temporarily unavailable 35 Resource temporarily unavailable 11 Resource temporarily unavailable
ENOMEM 1 0 Not enough space. 12 Not enough space 12 Not enough core 12 Not enough core 12 Out of memory 12 Not enough space 12 Not enough core 12 Cannot allocate memory 12 Cannot allocate memory 12 Not enough space
EACCES 1 0 Permission denied. 13 Permission denied 13 Permission denied 13 Permission denied 13 Permission denied 13 Permission denied 13 Permission denied 13 Permission denied 13 Permission denied 13 Permission denied
EFAULT 1 0 Bad address. 14 Bad address 14 Bad address 14 Bad address 14 Bad address 14 Bad address 14 Bad address 14 Bad address 14 Bad address 14 Bad address
ENOTBLK 0.9 15 Block device required 15 Block device required 15 Block device required 15 Block device required 15 Block device required 15 Block device required 15 Block device required 15 Block device required 15 Unknown error
EBUSY 1 0 Device or resource busy. 16 Resource busy 16 Mount device busy 16 Mount device busy 16 Device or resource busy 16 Resource busy 16 Mount device busy 16 Device busy 16 Device busy 16 Resource device
EEXIST 1 0 File exists. 17 File exists 17 File exists 17 File exists 17 File exists 17 File exists 17 File exists 17 File exists 17 File exists 17 File exists
EXDEV 1 0 Cross-device link. 18 Improper link 18 Cross-device link 18 Cross-device link 18 Cross-device link 18 Improper link 18 Cross-device link 18 Cross-device link 18 Cross-device link 18 Improper link
ENODEV 1 0 No such device. 19 No such device 19 No such device 19 No such device 19 No such device 19 No such device 19 No such device 19 Operation not supported by device 19 Operation not supported by device 19 No such device
ENOTDIR 1 0 Not a directory. 20 Not a directory 20 Not a directory 20 Not a directory 20 Not a directory 20 Not a directory 20 Not a directory 20 Not a directory 20 Not a directory 20 Not a directory
EISDIR 1 0 Is a directory. 21 Is a directory 21 Is a directory 21 Is a directory 21 Is a directory 21 Is a directory 21 Is a directory 21 Is a directory 21 Is a directory 21 Is a directory
EINVAL 1 0 Invalid argument. 22 Invalid argument 22 Invalid argument 22 Invalid argument 22 Invalid argument 22 Invalid argument 22 Invalid argument 22 Invalid argument 22 Invalid argument 22 Invalid argument
ENFILE 1 0 Too many files open in system. 23 Too many open files in system 23 File table overflow 23 File table overflow 23 File table overflow 23 File table overflow 23 File table overflow 23 Too many open files in system 23 Too many open files in system 23 Too many open files in system
EMFILE 1 0 Too many open files. 24 Too many open files 24 Too many open files 24 Too many open files 24 Too many open files 24 Too many open files 24 Too many open files 24 Too many open files 24 Too many open files 24 Too many open files
ENOTTY 1 0 Inappropriate I/O control operation. 25 Inappropriate I/O control operation 25 Not a typewriter 25 Inappropriate ioctl for device 25 Not a typewriter 25 Inappropriate I/O control operation 25 Not a typewriter 25 Inappropriate ioctl for device 25 Inappropriate ioctl for device 25 Inappropriate I/O control operation
ETXTBSY 1 0 Text file busy. 26 Text file busy 26 Text file busy 26 Text file busy 26 Text file busy 26 Text file busy 26 Text file busy 26 Text file busy 26 Text file busy 26 Unknown error
EFBIG 1 0 File too large. 27 File too large 27 File too large 27 File too large 27 File too large 27 File too large 27 File too large 27 File too large 27 File too large 27 File too large
ENOSPC 1 0 No space left on device. 28 No space left on device 28 No space left on device 28 No space left on device 28 No space left on device 28 No space left on device 28 No space left on device 28 No space left on device 28 No space left on device 28 No space left on device
ESPIPE 1 0 Invalid seek. 29 Invalid seek 29 Illegal seek 29 Illegal seek 29 Illegal seek 29 Illegal seek 29 Illegal seek 29 Illegal seek 29 Illegal seek 29 Invalid seek
EROFS 1 0 Read-only file system. 30 Read only file system 30 Read only file system 30 Read only file system 30 Read-only file system 30 Read only file system 30 Read-only file system 30 Read-only filesystem 30 Read-only file system 30 Read-only file system
EMLINK 1 0 Too many links. 31 Too many links 31 Too many links 31 Too many links 31 Too many links 31 Too many links 31 Too many links 31 Too many links 31 Too many links 31 Too many links
EPIPE 1 0 Broken pipe. 32 Broken pipe 32 Broken pipe 32 Broken pipe 32 Broken pipe 32 Broken pipe 32 Broken pipe 32 Broken pipe 32 Broken pipe 32 Broken pipe
EDOM 0.9 0 Mathematics argument out of domain of function. 33 Domain error within math function 33 Math arg out of domain of func 33 Math argument out of domain of func 33 Domain error 33 Argument too large 33 Numerical argument out of domain 33 Numerical argument out of domain 33 Domain error
ERANGE 0.9 0 Result too large. 34 Result too large 34 Math result not representable 34 Math result not representable 34 Result too large 34 Result too large 34 Result too large 34 Result too large 34 Result too large
ENOMSG 0.9 0 No message of the desired type. 35 No message of desired type 35 No message of desired type 35 No message of desired type 42 No message of desired type 35 No message of desired type 80 No msg matches receive request 83 No message of desired type 91 No message of desired type
EIDRM 0.9 0 Identifier removed. 36 Identifier removed 36 Identifier removed 36 Identifier removed 43 Identifier removed 36 Identifier removed 81 Msg queue id has been removed 82 Identifier removed 90 Identifier removed
EDEADLK 1 0 Resource deadlock would occur. 45 Resource deadlock avoided 45 A deadlock would occur 45 Deadlock condition. 35 Resource deadlock would occur 45 Resource deadlock avoided 11 Operation would cause deadlock 11 Resource deadlock avoided [5] 11 Resource deadlock avoided 36 Resource deadlock avoided
ENOLCK 1 0 No locks available. 49 No locks available 46 System record lock table was full 46 No record locks available. 37 No record locks available 46 No locks available 77 No locks available 77 No locks available 77 No locks available 39 No locks available
ESTALE 0.9 0 Reserved. 52 no filesystem 70 Stale NFS file handle 151 Stale NFS file handle 116 Stale NFS file handle 151 Stale NFS file handle 70 Stale NFS file handle 70 Stale NFS file handle 70 Stale NFS file handle
EINPROGRESS 0.9 0 Operation in progress. 55 Operation now in progress 245 Operation now in progress 150 operation now in progress 115 Operation now in progress 150 operation now in progress 36 Operation now in progress 36 Operation now in progress 36 Operation now in progress
EALREADY 0.9 0 Connection already in progress. 56 Operation already in progress 244 Operation already in progress 149 operation already in progress 114 Operation already in progress 149 operation already in progress 37 Operation already in progress 37 Operation already in progress 37 Operation already in progress
ENOTSOCK 0.9 0 Not a socket. 57 Socket operation on non-socket 216 Socket operation on non-socket 95 Socket operation on non-socket 88 Socket operation on non-socket 95 Socket operation on non-socket 38 Socket operation on non-socket 38 Socket operation on non-socket 38 Socket operation on non-socket
EDESTADDRREQ 0.9 0 Destination address required. 58 Destination address required 217 Destination address required 96 Destination address required 89 Destination address required 96 Destination address required 39 Destination address required 39 Destination address required 39 Destination address required
EMSGSIZE 0.9 0 Message too large. 59 Message too long 218 Message too long 97 Message too long 90 Message too long 97 Inappropriate message buffer length 40 Message too long 40 Message too long 40 Message too long
EPROTOTYPE 0.9 0 Protocol wrong type for socket. 60 Protocol wrong type for socket 219 Protocol wrong type for socket 98 Protocol wrong type for socket 91 Protocol wrong type for socket 98 Protocol wrong type for socket 41 Protocol wrong type for socket 41 Protocol wrong type for socket 41 Protocol wrong type for socket
ENOPROTOOPT 0.9 0 Protocol not available. 61 Protocol not available 220 Protocol not available 99 Protocol not available 92 Protocol not available 99 Protocol not available 42 Protocol not available 42 Protocol not available 42 Protocol not available
EPROTONOSUPPORT 0.9 0 Protocol not supported. 62 Protocol not supported 221 Protocol not supported 120 Protocol not supported 93 Protocol not supported 120 Protocol not supported 43 Protocol not supported 43 Protocol not supported 43 Protocol not supported
EOPNOTSUPP 0.9 0 Operation not supported on socket. 64 Operation not supported on socket 223 Operation not supported 122 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 Operation not supported 45 Operation not supported
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 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 Address family not supported by protocol family 47 Address family not supported by protocol family
EADDRINUSE 0.9 0 Address in use. 67 Address already in use 226 Address already in use 125 Address already in use 98 Address already in use 125 Address already in use 48 Address already in use 48 Address already in use 48 Address already in use
EADDRNOTAVAIL 0.9 0 Address not available. 68 Can't assign requested address 227 Can't assign requested address 126 Can't assign requested address 99 Cannot assign requested address 126 Can't assign requested address 49 Can't assign requested address 49 Can't assign requested address 49 Can't assign requested address
ENETDOWN 0.9 0 Network is down. 69 Network is down 228 Network is down 127 Network is down 100 Network is down 127 Network is down 50 Network is down 50 Network is down 50 Network is down
ENETUNREACH 0.9 0 Network unreachable. 70 Network is unreachable 229 Network is unreachable 128 Network is unreachable 101 Network is unreachable 128 Network is unreachable 51 Network is unreachable 51 Network is unreachable 51 Network is unreachable
ENETRESET 0.9 0 Connection aborted by network. 71 Network dropped connection on reset 230 Network dropped connection on reset 129 Network dropped connection because 102 Network dropped connection because of reset 129 Network dropped connection because 52 Network dropped connection on reset 52 Network dropped connection on reset 52 Network dropped connection on reset
ECONNABORTED 0.9 0 Connection aborted. 72 Software caused connection abort 231 Software caused connection abort 130 Software caused connection abort 103 Software caused connection abort 130 Software caused connection abort 53 Software caused connection abort 53 Software caused connection abort 53 Software caused connection abort
ECONNRESET 0.9 0 Connection reset. 73 Connection reset by peer 232 Connection reset by peer 131 Connection reset by peer 104 Connection reset by peer 131 Connection reset by peer 54 Connection reset by peer 54 Connection reset by peer 54 Connection reset by peer
ENOBUFS 0.9 0 No buffer space available. 74 No buffer space available 233 No buffer space available 132 No buffer space available 105 No buffer space available 132 No buffer space available 55 No buffer space available 55 No buffer space available 55 No buffer space available
EISCONN 0.9 0 Socket is connected. 75 Socket is already connected 234 Socket is already connected 133 Socket is already connected 106 Transport endpoint is already connected 133 Socket is already connected 56 Socket is already connected 56 Socket is already connected 56 Socket is already connected
ENOTCONN 0.9 0 The socket is not connected. 76 Socket is not connected 235 Socket is not connected 134 Socket is not connected 107 Transport endpoint is not connected 134 Socket is not connected 57 Socket is not connected 57 Socket is not connected 57 Socket is not connected
ETIMEDOUT 0.9 0 Connection timed out. 78 Connection timed out 238 Connection timed out 145 Connection timed out 110 Connection timed out 145 Connection timed out 60 Connection timed out 60 Operation timed out 60 Operation timed out
ECONNREFUSED 0.9 0 Connection refused. 79 Connection refused 239 Connection refused 146 Connection refused 111 Connection refused 146 Connection refused 61 Connection refused 61 Connection refused 61 Connection refused
EHOSTUNREACH 0.9 0 Host is unreachable. 81 No route to host 242 No route to host 148 No route to host 113 No route to host 148 No route to host 65 No route to host 65 No route to host 65 No route to host
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 Symbolic link loop 40 Too many symbolic links encountered 90 Symbolic link loop 62 Too many levels of symbolic links 62 Too many levels of symbolic links 62 Too many levels of symbolic links
ENAMETOOLONG 1 0 Filename too long. 86 File name too long 248 File name too long 78 path name is too long 36 File name too long 78 Filename too long 63 File name too long 63 File name too long 63 File name too long 38 Filename too long
ENOTEMPTY 1 0 Directory not empty. 87 Directory not empty [1] 247 Directory not empty 93 directory not empty 39 Directory not empty 93 Directory not empty 66 Directory not empty 66 Directory not empty 66 Directory not empty 41 Directory not empty
ENOSYS 1 0 Function not supported. 109 Function not implemented POSIX 251 Function not implemented 89 Unsupported file system operation 38 Function not implemented 89 Function not implemented 78 Function not implemented 78 Function not implemented 78 Function not implemented 40 Function not implemented
EILSEQ 1 0 Illegal byte sequence. 116 Invalid wide character 47 Illegal byte sequence 88 Illegal byte sequence. 84 Illegal byte sequence 88 Illegal byte sequence. 116 Invalid wide character 86 Illegal byte sequence 92 Illegal byte sequence 42 Illegal byte sequence
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 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 Value too large to be stored in data type 84 Value too large to be stored in data type

		SUSv3	AIX 4.3,5.1	HP-UX 11.22	Solaris 9,10	Linux 2.4.28,2.6.9	IRIX 6.5[4]	OSF1	FreeBSD 5.2.1	OSX 10.3.8	MSVC6
EPERM	1	0	Operation not permitted.	1	Operation not permitted	1	Not super-user	1	Not super-user	1	Operation not permitted	1	Operation not permitted	1	Not owner	1	Operation not permitted	1	Operation not permitted	1	Operation not permitted
ENOENT	1	0	No such file or directory.	2	No such file or directory	2	No such file or directory	2	No such file or directory	2	No such file or directory	2	No such file or directory	2	No such file or directory	2	No such file or directory	2	No such file or directory	2	No such file or directory
ESRCH	1	0	No such process.	3	No such process	3	No such process	3	No such process	3	No such process	3	No such process	3	No such process	3	No such process	3	No such process	3	No such process
EINTR	1	0	Interrupted function.	4	interrupted system call	4	interrupted system call	4	interrupted system call	4	Interrupted system call	4	Interrupted function call	4	Interrupted system call	4	Interrupted system call	4	Interrupted system call	4	Interrupted function call
EIO	1	0	I/O error.	5	I/O error	5	I/O error	5	I/O error	5	I/O error	5	I/O error	5	I/O error	5	Input/output error	5	Input/output error	5	Input/output error
ENXIO	1	0	No such device or address.	6	No such device or address	6	No such device or address	6	No such device or address	6	No such device or address	6	No such device or address	6	No such device or address	6	Device not configured	6	Device not configured	6	No such device or address
E2BIG	1	0	Argument list too long.	7	Arg list too long	7	Arg list too long	7	Arg list too long	7	Arg list too long	7	Arg list too long	7	Arg list too long	7	Argument list too long	7	Argument list too long	7	Arg list too long
ENOEXEC	1	0	Executable file format error.	8	Exec format error	8	Exec format error	8	Exec format error	8	Exec format error	8	Exec format error	8	Exec format error	8	Exec format error	8	Exec format error	8	Exec format error
EBADF	1	0	Bad file descriptor.	9	Bad file descriptor	9	Bad file number	9	Bad file number	9	Bad file number	9	Bad file number	9	Bad file number	9	Bad file descriptor	9	Bad file descriptor	9	Bad file descriptor
ECHILD	1	0	No child processes.	10	No child processes	10	No children	10	No children	10	No child processes	10	No child processes	10	No children	10	No child processes	10	No child processes	10	No child processes
EAGAIN	1	0	Resource unavailable, try again [3]	11	Resource temporarily unavailable	11	No more processes	11	Resource temporarily unavailable	11	Try again	11	Resource temporarily unavailable	11	ditto	35	Resource temporarily unavailable	35	Resource temporarily unavailable	11	Resource temporarily unavailable
ENOMEM	1	0	Not enough space.	12	Not enough space	12	Not enough core	12	Not enough core	12	Out of memory	12	Not enough space	12	Not enough core	12	Cannot allocate memory	12	Cannot allocate memory	12	Not enough space
EACCES	1	0	Permission denied.	13	Permission denied	13	Permission denied	13	Permission denied	13	Permission denied	13	Permission denied	13	Permission denied	13	Permission denied	13	Permission denied	13	Permission denied
EFAULT	1	0	Bad address.	14	Bad address	14	Bad address	14	Bad address	14	Bad address	14	Bad address	14	Bad address	14	Bad address	14	Bad address	14	Bad address
ENOTBLK	0.9			15	Block device required	15	Block device required	15	Block device required	15	Block device required	15	Block device required	15	Block device required	15	Block device required	15	Block device required	15	Unknown error
EBUSY	1	0	Device or resource busy.	16	Resource busy	16	Mount device busy	16	Mount device busy	16	Device or resource busy	16	Resource busy	16	Mount device busy	16	Device busy	16	Device busy	16	Resource device
EEXIST	1	0	File exists.	17	File exists	17	File exists	17	File exists	17	File exists	17	File exists	17	File exists	17	File exists	17	File exists	17	File exists
EXDEV	1	0	Cross-device link.	18	Improper link	18	Cross-device link	18	Cross-device link	18	Cross-device link	18	Improper link	18	Cross-device link	18	Cross-device link	18	Cross-device link	18	Improper link
ENODEV	1	0	No such device.	19	No such device	19	No such device	19	No such device	19	No such device	19	No such device	19	No such device	19	Operation not supported by device	19	Operation not supported by device	19	No such device
ENOTDIR	1	0	Not a directory.	20	Not a directory	20	Not a directory	20	Not a directory	20	Not a directory	20	Not a directory	20	Not a directory	20	Not a directory	20	Not a directory	20	Not a directory
EISDIR	1	0	Is a directory.	21	Is a directory	21	Is a directory	21	Is a directory	21	Is a directory	21	Is a directory	21	Is a directory	21	Is a directory	21	Is a directory	21	Is a directory
EINVAL	1	0	Invalid argument.	22	Invalid argument	22	Invalid argument	22	Invalid argument	22	Invalid argument	22	Invalid argument	22	Invalid argument	22	Invalid argument	22	Invalid argument	22	Invalid argument
ENFILE	1	0	Too many files open in system.	23	Too many open files in system	23	File table overflow	23	File table overflow	23	File table overflow	23	File table overflow	23	File table overflow	23	Too many open files in system	23	Too many open files in system	23	Too many open files in system
EMFILE	1	0	Too many open files.	24	Too many open files	24	Too many open files	24	Too many open files	24	Too many open files	24	Too many open files	24	Too many open files	24	Too many open files	24	Too many open files	24	Too many open files
ENOTTY	1	0	Inappropriate I/O control operation.	25	Inappropriate I/O control operation	25	Not a typewriter	25	Inappropriate ioctl for device	25	Not a typewriter	25	Inappropriate I/O control operation	25	Not a typewriter	25	Inappropriate ioctl for device	25	Inappropriate ioctl for device	25	Inappropriate I/O control operation
ETXTBSY	1	0	Text file busy.	26	Text file busy	26	Text file busy	26	Text file busy	26	Text file busy	26	Text file busy	26	Text file busy	26	Text file busy	26	Text file busy	26	Unknown error
EFBIG	1	0	File too large.	27	File too large	27	File too large	27	File too large	27	File too large	27	File too large	27	File too large	27	File too large	27	File too large	27	File too large
ENOSPC	1	0	No space left on device.	28	No space left on device	28	No space left on device	28	No space left on device	28	No space left on device	28	No space left on device	28	No space left on device	28	No space left on device	28	No space left on device	28	No space left on device
ESPIPE	1	0	Invalid seek.	29	Invalid seek	29	Illegal seek	29	Illegal seek	29	Illegal seek	29	Illegal seek	29	Illegal seek	29	Illegal seek	29	Illegal seek	29	Invalid seek
EROFS	1	0	Read-only file system.	30	Read only file system	30	Read only file system	30	Read only file system	30	Read-only file system	30	Read only file system	30	Read-only file system	30	Read-only filesystem	30	Read-only file system	30	Read-only file system
EMLINK	1	0	Too many links.	31	Too many links	31	Too many links	31	Too many links	31	Too many links	31	Too many links	31	Too many links	31	Too many links	31	Too many links	31	Too many links
EPIPE	1	0	Broken pipe.	32	Broken pipe	32	Broken pipe	32	Broken pipe	32	Broken pipe	32	Broken pipe	32	Broken pipe	32	Broken pipe	32	Broken pipe	32	Broken pipe
EDOM	0.9	0	Mathematics argument out of domain of function.	33	Domain error within math function			33	Math arg out of domain of func	33	Math argument out of domain of func	33	Domain error	33	Argument too large	33	Numerical argument out of domain	33	Numerical argument out of domain	33	Domain error
ERANGE	0.9	0	Result too large.	34	Result too large			34	Math result not representable	34	Math result not representable	34	Result too large	34	Result too large	34	Result too large	34	Result too large	34	Result too large
ENOMSG	0.9	0	No message of the desired type.	35	No message of desired type	35	No message of desired type	35	No message of desired type	42	No message of desired type	35	No message of desired type	80	No msg matches receive request	83	No message of desired type	91	No message of desired type
EIDRM	0.9	0	Identifier removed.	36	Identifier removed	36	Identifier removed	36	Identifier removed	43	Identifier removed	36	Identifier removed	81	Msg queue id has been removed	82	Identifier removed	90	Identifier removed
EDEADLK	1	0	Resource deadlock would occur.	45	Resource deadlock avoided	45	A deadlock would occur	45	Deadlock condition.	35	Resource deadlock would occur	45	Resource deadlock avoided	11	Operation would cause deadlock	11	Resource deadlock avoided [5]	11	Resource deadlock avoided	36	Resource deadlock avoided
ENOLCK	1	0	No locks available.	49	No locks available	46	System record lock table was full	46	No record locks available.	37	No record locks available	46	No locks available	77	No locks available	77	No locks available	77	No locks available	39	No locks available
ESTALE	0.9	0	Reserved.	52	no filesystem	70	Stale NFS file handle	151	Stale NFS file handle	116	Stale NFS file handle	151	Stale NFS file handle	70	Stale NFS file handle	70	Stale NFS file handle	70	Stale NFS file handle
EINPROGRESS	0.9	0	Operation in progress.	55	Operation now in progress	245	Operation now in progress	150	operation now in progress	115	Operation now in progress	150	operation now in progress	36	Operation now in progress	36	Operation now in progress	36	Operation now in progress
EALREADY	0.9	0	Connection already in progress.	56	Operation already in progress	244	Operation already in progress	149	operation already in progress	114	Operation already in progress	149	operation already in progress	37	Operation already in progress	37	Operation already in progress	37	Operation already in progress
ENOTSOCK	0.9	0	Not a socket.	57	Socket operation on non-socket	216	Socket operation on non-socket	95	Socket operation on non-socket	88	Socket operation on non-socket	95	Socket operation on non-socket	38	Socket operation on non-socket	38	Socket operation on non-socket	38	Socket operation on non-socket
EDESTADDRREQ	0.9	0	Destination address required.	58	Destination address required	217	Destination address required	96	Destination address required	89	Destination address required	96	Destination address required	39	Destination address required	39	Destination address required	39	Destination address required
EMSGSIZE	0.9	0	Message too large.	59	Message too long	218	Message too long	97	Message too long	90	Message too long	97	Inappropriate message buffer length	40	Message too long	40	Message too long	40	Message too long
EPROTOTYPE	0.9	0	Protocol wrong type for socket.	60	Protocol wrong type for socket	219	Protocol wrong type for socket	98	Protocol wrong type for socket	91	Protocol wrong type for socket	98	Protocol wrong type for socket	41	Protocol wrong type for socket	41	Protocol wrong type for socket	41	Protocol wrong type for socket
ENOPROTOOPT	0.9	0	Protocol not available.	61	Protocol not available	220	Protocol not available	99	Protocol not available	92	Protocol not available	99	Protocol not available	42	Protocol not available	42	Protocol not available	42	Protocol not available
EPROTONOSUPPORT	0.9	0	Protocol not supported.	62	Protocol not supported	221	Protocol not supported	120	Protocol not supported	93	Protocol not supported	120	Protocol not supported	43	Protocol not supported	43	Protocol not supported	43	Protocol not supported
EOPNOTSUPP	0.9	0	Operation not supported on socket.	64	Operation not supported on socket	223	Operation not supported	122	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	Operation not supported	45	Operation not supported
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	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	Address family not supported by protocol family	47	Address family not supported by protocol family
EADDRINUSE	0.9	0	Address in use.	67	Address already in use	226	Address already in use	125	Address already in use	98	Address already in use	125	Address already in use	48	Address already in use	48	Address already in use	48	Address already in use
EADDRNOTAVAIL	0.9	0	Address not available.	68	Can't assign requested address	227	Can't assign requested address	126	Can't assign requested address	99	Cannot assign requested address	126	Can't assign requested address	49	Can't assign requested address	49	Can't assign requested address	49	Can't assign requested address
ENETDOWN	0.9	0	Network is down.	69	Network is down	228	Network is down	127	Network is down	100	Network is down	127	Network is down	50	Network is down	50	Network is down	50	Network is down
ENETUNREACH	0.9	0	Network unreachable.	70	Network is unreachable	229	Network is unreachable	128	Network is unreachable	101	Network is unreachable	128	Network is unreachable	51	Network is unreachable	51	Network is unreachable	51	Network is unreachable
ENETRESET	0.9	0	Connection aborted by network.	71	Network dropped connection on reset	230	Network dropped connection on reset	129	Network dropped connection because	102	Network dropped connection because of reset	129	Network dropped connection because	52	Network dropped connection on reset	52	Network dropped connection on reset	52	Network dropped connection on reset
ECONNABORTED	0.9	0	Connection aborted.	72	Software caused connection abort	231	Software caused connection abort	130	Software caused connection abort	103	Software caused connection abort	130	Software caused connection abort	53	Software caused connection abort	53	Software caused connection abort	53	Software caused connection abort
ECONNRESET	0.9	0	Connection reset.	73	Connection reset by peer	232	Connection reset by peer	131	Connection reset by peer	104	Connection reset by peer	131	Connection reset by peer	54	Connection reset by peer	54	Connection reset by peer	54	Connection reset by peer
ENOBUFS	0.9	0	No buffer space available.	74	No buffer space available	233	No buffer space available	132	No buffer space available	105	No buffer space available	132	No buffer space available	55	No buffer space available	55	No buffer space available	55	No buffer space available
EISCONN	0.9	0	Socket is connected.	75	Socket is already connected	234	Socket is already connected	133	Socket is already connected	106	Transport endpoint is already connected	133	Socket is already connected	56	Socket is already connected	56	Socket is already connected	56	Socket is already connected
ENOTCONN	0.9	0	The socket is not connected.	76	Socket is not connected	235	Socket is not connected	134	Socket is not connected	107	Transport endpoint is not connected	134	Socket is not connected	57	Socket is not connected	57	Socket is not connected	57	Socket is not connected
ETIMEDOUT	0.9	0	Connection timed out.	78	Connection timed out	238	Connection timed out	145	Connection timed out	110	Connection timed out	145	Connection timed out	60	Connection timed out	60	Operation timed out	60	Operation timed out
ECONNREFUSED	0.9	0	Connection refused.	79	Connection refused	239	Connection refused	146	Connection refused	111	Connection refused	146	Connection refused	61	Connection refused	61	Connection refused	61	Connection refused
EHOSTUNREACH	0.9	0	Host is unreachable.	81	No route to host	242	No route to host	148	No route to host	113	No route to host	148	No route to host	65	No route to host	65	No route to host	65	No route to host
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	Symbolic link loop	40	Too many symbolic links encountered	90	Symbolic link loop	62	Too many levels of symbolic links	62	Too many levels of symbolic links	62	Too many levels of symbolic links
ENAMETOOLONG	1	0	Filename too long.	86	File name too long	248	File name too long	78	path name is too long	36	File name too long	78	Filename too long	63	File name too long	63	File name too long	63	File name too long	38	Filename too long
ENOTEMPTY	1	0	Directory not empty.	87	Directory not empty [1]	247	Directory not empty	93	directory not empty	39	Directory not empty	93	Directory not empty	66	Directory not empty	66	Directory not empty	66	Directory not empty	41	Directory not empty
ENOSYS	1	0	Function not supported.	109	Function not implemented POSIX	251	Function not implemented	89	Unsupported file system operation	38	Function not implemented	89	Function not implemented	78	Function not implemented	78	Function not implemented	78	Function not implemented	40	Function not implemented
EILSEQ	1	0	Illegal byte sequence.	116	Invalid wide character	47	Illegal byte sequence	88	Illegal byte sequence.	84	Illegal byte sequence	88	Illegal byte sequence.	116	Invalid wide character	86	Illegal byte sequence	92	Illegal byte sequence	42	Illegal byte sequence
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	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	Value too large to be stored in data type	84	Value too large to be stored in data type

[1] AIX ENOTEMPTY is 17 "Directory not empty" if _ALL_SOURCE and !_LINUX_SOURCE_COMPAT
[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