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

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

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 requirements described here
       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2008
       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  or  definition  for
       errno.	The  symbol  errno shall expand to a modifiable lvalue of type
       int.  It is unspecified whether errno  is  a  macro  or	an  identifier
       declared	 with external linkage. If a macro definition is suppressed in
       order to access an actual object, or a program  defines	an  identifier
       with the name errno, the behavior is undefined.

       The  <errno.h>  header  shall  define  the following macros which shall
       expand to integer constant expressions with type int, distinct positive
       values  (except as noted below), and which shall be suitable for use in
       #if preprocessing directives:

       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 File descriptor value too large.

       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 or a symbolic link to a directory.

       ENOTEMPTY
	      Directory not empty.

       ENOTRECOVERABLE
	      State not recoverable.

       ENOTSOCK
	      Not a socket.

       ENOTSUP
	      Not supported (may be the same value as [EOPNOTSUPP]).

       ENOTTY Inappropriate I/O control operation.

       ENXIO  No such device or address.

       EOPNOTSUPP
	      Operation	 not  supported	 on  socket  (may be the same value as
	      [ENOTSUP]).

       EOVERFLOW
	      Value too large to be stored in data type.

       EOWNERDEAD
	      Previous owner died.

       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 POSIX.1‐2008.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       The  System  Interfaces volume of POSIX.1‐2008, Section 2.3, Error Num‐
       bers

COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),	The  Open  Group  Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
       cal and Electronics Engineers,  Inc  and	 The  Open  Group.   (This  is
       POSIX.1-2008  with  the	2013  Technical Corrigendum 1 applied.) 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.unix.org/online.html .

       Any  typographical  or  formatting  errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files  to  man page format. To report such errors, see https://www.ker‐
       nel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2013			   errno.h(0P)
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