on_exit - register a function to be called at normal process
int on_exit(void (*function)(int , void *), void *arg);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
on_exit(): _BSD_SOURCE || _SVID_SOURCE
The on_exit() function registers the given function to be called at
normal process termination, whether via exit(3) or via return from the
program’s main(). The function is passed the status argument given to
the last call to exit(3) and the arg argument from on_exit().
The same function may be registered multiple times: it is called once
for each registration.
When a child process is created via fork(2), it inherits copies of its
parent’s registrations. Upon a successful call to one of the exec(3)
functions, all registrations are removed.
The on_exit() function returns the value 0 if successful; otherwise it
returns a nonzero value.
This function comes from SunOS 4, but is also present in libc4, libc5
and glibc. It no longer occurs in Solaris (SunOS 5). Avoid this
function, and use the standard atexit(3) instead.
_exit(2), atexit(3), exit(3)
This page is part of release 3.24 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.