The Single UNIX ® Specification, Version 2
Copyright © 1997 The Open Group

 NAME

errno.h - system error numbers

 SYNOPSIS



#include <errno.h>

 DESCRIPTION

The <errno.h> header provides a declaration for errno and gives non-zero values for the following symbolic constants. Their values are unique  except as noted below:
E2BIG
Argument list too long.
EACCES
Permission denied.
EADDRINUSE
Address in use.
EADDRNOTAVAIL
Address not available.
EAFNOSUPPORT
Address family not supported.
EAGAIN
Resource unavailable, try again (may be the same value as EWOULDBLOCK).
EALREADY
Connection already in progress.
EBADF
Bad file descriptor.
EBADMSG
Bad message.
EBUSY
Device or resource busy.
ECANCELED
Operation canceled.
ECHILD
No child processes.
ECONNABORTED
Connection aborted.
ECONNREFUSED
Connection refused.
ECONNRESET
Connection reset.
EDEADLK
Resource deadlock would occur.
EDESTADDRREQ
Destination address required.
EDOM
Mathematics argument out of domain of function.
EDQUOT
Reserved.
EEXIST
File exists.
EFAULT
Bad address.
EFBIG
File too large.
EHOSTUNREACH
Host is unreachable.
EIDRM
Identifier removed.
EILSEQ
Illegal byte sequence.
EINPROGRESS
Operation in progress.
EINTR
Interrupted function.
EINVAL
Invalid argument.
EIO
I/O error.
EISCONN
Socket is connected.
EISDIR
Is a directory.
ELOOP
Too many levels of symbolic links.
EMFILE
Too many open files.
EMLINK
Too many links.
EMSGSIZE
Message too large.
EMULTIHOP
Reserved.
ENAMETOOLONG
Filename too long.
ENETDOWN
Network is down.
ENETUNREACH
Network unreachable.
ENFILE
Too many files open in system.
ENOBUFS
No buffer space available.
ENODATA
No message is available on the STREAM head read queue.
ENODEV
No such device.
ENOENT
No such file or directory.
ENOEXEC
Executable file format error.
ENOLCK
No locks available.
ENOLINK
Reserved.
ENOMEM
Not enough space.
ENOMSG
No message of the desired type.
ENOPROTOOPT
Protocol not available.
ENOSPC
No space left on device.
ENOSR
No STREAM resources.
ENOSTR
Not a STREAM.
ENOSYS
Function not supported.
ENOTCONN
The socket is not connected.
ENOTDIR
Not a directory.
ENOTEMPTY
Directory not empty.
ENOTSOCK
Not a socket.
ENOTSUP
Not supported.
ENOTTY
Inappropriate I/O control operation.
ENXIO
No such device or address.
EOPNOTSUPP
Operation not supported on socket.
EOVERFLOW
Value too large to be stored in data type.
EPERM
Operation not permitted.
EPIPE
Broken pipe.
EPROTO
Protocol error.
EPROTONOSUPPORT
Protocol not supported.
EPROTOTYPE
Socket type not supported.
ERANGE
Result too large.
EROFS
Read-only file system.
ESPIPE
Invalid seek.
ESRCH
No such process.
ESTALE
Reserved.
ETIME
Stream ioctl() timeout.
ETIMEDOUT
Connection timed out.
ETXTBSY
Text file busy.
EWOULDBLOCK
Operation would block (may be the same value as [EAGAIN]).
EXDEV
Cross-device link.

 APPLICATION USAGE

Additional error numbers may be defined on XSI-conformant systems. See Additional Error Numbers .

 FUTURE DIRECTIONS

None.

 SEE ALSO

errors.

UNIX ® is a registered Trademark of The Open Group.
Copyright © 1997 The Open Group
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