EXIT(3P) POSIX Programmer's Manual EXIT(3P)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.
NAMEexit — terminate a process
void exit(int status);
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.1‐2008
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 to a waiting parent process.
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 ter‐
minate 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
The exit() function does not return.
No errors are defined.
The following sections are informative.
SEE ALSO_Exit(), atexit(), exec, longjmp(), tmpfile()
The Base Definitions volume of POSIX.1‐2008, <stdlib.h>
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 .
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IEEE/The Open Group 2013 EXIT(3P)