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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 registered by the atexit() function
       shall be called, 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. Normal ter‐
       mination 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 original Standard can be obtained online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003			     ATEXIT(P)
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