.\" Copyright (c) 1990 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" Chris Torek.
.\"
.\" %sccs.include.redist.man%
.\"
.\"	@(#)atexit.3	5.1 (Berkeley) %G%
.\"
.TH ATEXIT 3 ""
.UC 7
.SH NAME
atexit \- register a function to be called on exit
.SH SYNOPSIS
.B #include <stdlib.h>
.PP
.B "atexit(void (*function)())
.SH DESCRIPTION
.B Atexit
registers the given
.I function
to be called at program exit, whether via
.IR exit (3)
or via return from the program's
.BR main .
Functions so registered are called in reverse order;
no arguments are passed.
At least 32 functions can always be registered,
and more are allowed as long as sufficient memory can be allocated.
.SH RETURN VALUE
.B Atexit
returns 0 on success, \-1 on error.
.SH ERRORS
.TP
[ENOMEM]
No memory was available to add the function to the list.
The existing list of functions is unmodified.
.SH SEE ALSO
exit(3)
.SH STANDARDS
.B Atexit
conforms to ANSI X3.159-1989 (``ANSI C'').