<errno.h>(0P)                                       POSIX Programmer's Manual                                      <errno.h>(0P)



NAME
       errno.h - system error numbers

SYNOPSIS
       #include <errno.h>

DESCRIPTION
       Some  of the functionality described on this reference page extends the ISO C standard. Any conflict between the require-
       ments described here and the ISO C standard is unintentional.  This volume of IEEE Std 1003.1-2001 defers  to  the  ISO C
       standard.

       The ISO C standard only requires the symbols [EDOM], [EILSEQ], and [ERANGE] to be defined.

       The <errno.h> header shall provide a declaration for errno and give positive values for the following symbolic constants.
       Their values shall be 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.

       ENETRESET
              Connection aborted by network.

       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
              Protocol wrong type for socket.

       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.


       The following sections are informative.

APPLICATION USAGE
       Additional error numbers may be defined on conforming systems; see the System Interfaces volume of IEEE Std 1003.1-2001.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       The System Interfaces volume of IEEE Std 1003.1-2001, Section 2.3, Error Numbers

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003  Edition,  Standard  for
       Information  Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copy-
       right (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any
       discrepancy  between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group
       Standard  is  the  referee   document.   The   original   Standard   can   be   obtained   online   at   http://www.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                 <errno.h>(0P)