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

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 reg-
       istered	by the atexit() function shall be called, in the reverse order of their registra-
       tion, except that a function is called after any previously registered 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, Standard for Information Technology  --  Portable	Operating  System
       Interface  (POSIX), The Open Group Base Specifications 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
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					ATEXIT(P)
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