EXIT
Section: POSIX Programmer's Manual (3P)
Updated: 2017
Index
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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
exit
--- terminate a process
SYNOPSIS
#include <stdlib.h>
void exit(int status);
DESCRIPTION
The functionality described on this reference page is aligned with the
ISO C standard. Any conflict between the requirements described here and the
ISO C standard is unintentional. This volume of POSIX.1-2017 defers to the ISO C standard.
The value of
status
may be 0, EXIT_SUCCESS, EXIT_FAILURE,
or any other value, though only the least significant 8 bits (that is,
status
& 0377) shall be available from
wait()
and
waitpid();
the full value shall be available from
waitid()
and in the
siginfo_t
passed to a signal handler for SIGCHLD.
The
exit()
function shall first call all functions registered by
atexit(),
in the reverse order of their registration, except that a function is
called after any previously registered functions that had already been
called at the time it was registered. Each function is called as many
times as it was registered. If, during the call to any such function, a
call to the
longjmp()
function is made that would terminate the call to the registered
function, the behavior is undefined.
If a function registered by a call to
atexit()
fails to return, the remaining registered functions shall not be called
and the rest of the
exit()
processing shall not be completed. If
exit()
is called more than once, the behavior is undefined.
The
exit()
function shall then flush all open streams with unwritten buffered data
and close all open streams. Finally, the process shall be terminated
with the same consequences as described in
Consequences of Process Termination.
RETURN VALUE
The
exit()
function does not return.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
See
_Exit().
FUTURE DIRECTIONS
None.
SEE ALSO
_Exit(),
atexit(),
exec,
longjmp(),
tmpfile(),
wait(),
waitid()
The Base Definitions volume of POSIX.1-2017,
<stdlib.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1-2017, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, 2018 Edition,
Copyright (C) 2018 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.opengroup.org/unix/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.kernel.org/doc/man-pages/reporting_bugs.html .
Index
- PROLOG
-
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- EXAMPLES
-
- APPLICATION USAGE
-
- RATIONALE
-
- FUTURE DIRECTIONS
-
- SEE ALSO
-
- COPYRIGHT
-
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