atexit man page on CentOS

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ATEXIT(3)		   Linux Programmer's Manual		     ATEXIT(3)

NAME
       atexit - register a function to be called at normal process termination

SYNOPSIS
       #include <stdlib.h>

       int atexit(void (*function)(void));

DESCRIPTION
       The atexit() function registers the given function to be called at nor‐
       mal process termination, either via exit(3) or via return from the pro‐
       gram's main().  Functions so registered are called in the reverse order
       of their registration; no arguments are passed.

       POSIX.1-2001 requires that an implementation allow at least  ATEXIT_MAX
       (32) such functions to be registered.  The actual limit supported by an
       implementation can be obtained using sysconf(3).

       When a child process is created via fork(), it inherits copies  of  the
       its parents registrations.  Upon a successful call to one of the exec()
       functions, all registrations are removed.

RETURN VALUE
       The atexit() function returns the value 0 if successful;	 otherwise  it
       returns a non-zero value.

EXAMPLE
       #include <stdio.h>
       #include <stdlib.h>
       #include <unistd.h>

       void bye(void) {
	       printf("That was all, folks\n");
       }

       int main(){
	       long a;
	       int i;

	       a = sysconf(_SC_ATEXIT_MAX);
	       printf("ATEXIT_MAX = %ld\n", a);

	       i = atexit(bye);
	       if (i != 0) {
		       fprintf(stderr, "cannot set exit function\n");
		       return EXIT_FAILURE;
	       }
	       return EXIT_SUCCESS;
       }

NOTES
       Since  glibc  2.2.3,  atexit()  (and on_exit()) can be used to within a
       shared library to establish functions that are called when  the	shared
       library is unloaded.

       Functions registered using atexit() (and on_exit()) are not called if a
       process terminates abnormally because of the delivery of a signal.

CONFORMING TO
       SVr4, 4.3BSD, C89, C99, POSIX.1-2001.

SEE ALSO
       _exit(3), exit(3), on_exit(3)

				  2003-11-01			     ATEXIT(3)
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