ATEXIT man page on Oracle

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

       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.

       atexit - register a function to run at process termination

       #include <stdlib.h>

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

       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.

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

       No errors are defined.

       The following sections are informative.


       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().



       exit(), sysconf(), the Base Definitions volume of IEEE Std 1003.1-2001,

       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 .

IEEE/The Open Group		     2003			    ATEXIT(3P)

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