.\" Copyright (c) 1990 The Regents of the University of California.
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.\" This code is derived from software contributed to Berkeley by
.\" Chris Torek.
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.\"	@(#)atexit.3	5.1 (Berkeley) 5/15/90
.\"
.TH ATEXIT 3 "May 15, 1990"
.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'').