centos man page for atexit

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 differ (consult the correspond-
       ing 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 nor-
       mal  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. Nor-
       mal 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 Technol-
       ogy -- 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(3P)