ATEXIT(3) NEWLIB ATEXIT(3)NAME
2.6 `atexit'--request execution of functions at program exit
SYNOPSIS
#include <stdlib.h>
int atexit (void (*FUNCTION)(void));
DESCRIPTION
You can use `atexit' 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 must not require arguments
and must not return a result).
The functions are kept in a LIFO stack; that is, the last function
enrolled by `atexit' will be the first to execute when your program
exits.
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' 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
`atexit' 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
`atexit' is required by the ANSI standard, which also specifies that
implementations must support enrolling at least 32 functions.
Supporting OS subroutines required: `close', `fstat', `isatty',
`lseek', `read', `sbrk', `write'.
SEE ALSOatexit 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 ATEXIT(3)
