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ATEXIT(3P)                 POSIX Programmer's Manual                ATEXIT(3P)



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

NAME
       atexit - register a function to run at process termination

SYNOPSIS
       #include <stdlib.h>

       int atexit(void (*func)(void));


DESCRIPTION
       The  atexit() function shall register the function pointed to by func, to be called without arguments at normal
       program termination. At normal program termination, all functions registered by the atexit() function shall  be
       called,  in the reverse order of their registration, except that a function is called after any previously reg-
       istered functions that had already been called at the time it was registered. Normal termination occurs  either
       by a call to exit() or a return from main().

       At least 32 functions can be registered with atexit().

       After  a successful call to any of the exec functions, any functions previously registered by atexit() shall no
       longer be registered.

RETURN VALUE
       Upon successful completion, atexit() shall return 0; otherwise, it shall return a non-zero value.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       The functions registered by a call to atexit() must return to ensure that all registered functions are  called.

       The  application should call sysconf() to obtain the value of {ATEXIT_MAX}, the number of functions that can be
       registered. There is no way for an application to tell how many functions have  already  been  registered  with
       atexit().

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       exit(), sysconf(), the Base Definitions volume of IEEE Std 1003.1-2001, <stdlib.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  Issue  6,  Copyright (C) 2001-2003 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 Stan-
       dard,  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 .



IEEE/The Open Group                  2003                           ATEXIT(3P)