EXIT(3)                    POSIX Programmer's Manual                   EXIT(3)



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

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 .



IEEE/The Open Group                  2017                              EXIT(3)
