ON_EXIT(3) NEWLIB ON_EXIT(3)NAME
2.30 `on_exit'--request execution of function with argument at program
exit
SYNOPSIS
#include <stdlib.h>
int on_exit (void (*FUNCTION)(int, void *), void *ARG);
DESCRIPTION
You can use `on_exit' to enroll functions in a list of functions that
will be called when your program terminates normally. The argument is
a pointer to a user-defined function which takes two arguments. The
first is the status code passed to exit and the second argument is of
type pointer to void. The function must not return a result. The
value of ARG is registered and passed as the argument to FUNCTION.
The functions are kept in a LIFO stack; that is, the last function
enrolled by `atexit' or `on_exit' will be the first to execute when
your program exits. You can intermix functions using `atexit' and
`on_exit'.
There is no built-in limit to the number of functions you can enroll
in this list; however, after every group of 32 functions is enrolled,
`atexit'/`on_exit' will call `malloc' to get space for the next part of
the list. The initial list of 32 functions is statically allocated,
so you can always count on at least that many slots available.
RETURNS
`on_exit' returns `0' if it succeeds in enrolling your function, `-1'
if it fails (possible only if no space was available for `malloc' to
extend the list of functions).
PORTABILITY
`on_exit' is a non-standard glibc extension
Supporting OS subroutines required: None
SEE ALSOon_exit is part of the library. The full documentation for is main‐
tained as a Texinfo manual. If info and are properly installed at your
site, the command
info
will give you access to the complete manual.
NEWLIB April 2010 ON_EXIT(3)
