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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)