redhat man page for on_exit

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

NAME
       on_exit - register a function to be called at normal program termination.

SYNOPSIS
       #include <stdlib.h>

       int on_exit(void (*function)(int , void *), void *arg);

DESCRIPTION
       The  on_exit() function registers the given function to be called at normal program termination, whether via exit(3) or via return from the
       program's main.	The function is passed the argument to exit(3) and the arg argument from on_exit().

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

CONFORMING TO
       This function comes from SunOS, but is also present in libc4, libc5 and glibc.

SEE ALSO
       atexit(3), exit(3)

GNU
								    1993-04-02								ON_EXIT(3)