atexit

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



NAME
       atexit  -  register a function to be called at normal program termina-
       tion

SYNOPSIS
       #include <stdlib.h>

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

DESCRIPTION
       The atexit() function registers the given function  to  be  called  at
       normal  program termination, either via exit(3) or via return from the
       program’s main().  Functions so registered are called in	 the  reverse
       order of their registration; no arguments are passed.

       At  least  ATEXIT_MAX  functions	 can  be registered. This value is at
       least 32. It can be obtained using sysconf(3).

       By a successful call to one of the exec functions,  all	registrations
       are undone.

RETURN VALUE
       The  atexit() function returns the value 0 if successful; otherwise it
       returns a nonzero 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;
       }

CONFORMING TO
       SVID 3, BSD 4.3, ISO 9899, POSIX 1003.1-2001

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



				  2003-11-01			    ATEXIT(3)