1*afd81535Swiz.\" $NetBSD: atexit.3,v 1.11 2013/04/26 19:37:04 wiz Exp $ 26dda330eSthorpej.\" 35f8a6c06Sperry.\" Copyright (c) 1990, 1991, 1993 45f8a6c06Sperry.\" The Regents of the University of California. All rights reserved. 561f28255Scgd.\" 661f28255Scgd.\" This code is derived from software contributed to Berkeley by 761f28255Scgd.\" Chris Torek and the American National Standards Committee X3, 861f28255Scgd.\" on Information Processing Systems. 961f28255Scgd.\" 1061f28255Scgd.\" Redistribution and use in source and binary forms, with or without 1161f28255Scgd.\" modification, are permitted provided that the following conditions 1261f28255Scgd.\" are met: 1361f28255Scgd.\" 1. Redistributions of source code must retain the above copyright 1461f28255Scgd.\" notice, this list of conditions and the following disclaimer. 1561f28255Scgd.\" 2. Redistributions in binary form must reproduce the above copyright 1661f28255Scgd.\" notice, this list of conditions and the following disclaimer in the 1761f28255Scgd.\" documentation and/or other materials provided with the distribution. 18eb7c1594Sagc.\" 3. Neither the name of the University nor the names of its contributors 1961f28255Scgd.\" may be used to endorse or promote products derived from this software 2061f28255Scgd.\" without specific prior written permission. 2161f28255Scgd.\" 2261f28255Scgd.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2361f28255Scgd.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2461f28255Scgd.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2561f28255Scgd.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2661f28255Scgd.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2761f28255Scgd.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2861f28255Scgd.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2961f28255Scgd.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3061f28255Scgd.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3161f28255Scgd.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3261f28255Scgd.\" SUCH DAMAGE. 3361f28255Scgd.\" 345f8a6c06Sperry.\" from: @(#)atexit.3 8.1 (Berkeley) 6/4/93 3561f28255Scgd.\" 365f8a6c06Sperry.Dd June 4, 1993 3761f28255Scgd.Dt ATEXIT 3 3861f28255Scgd.Os 3961f28255Scgd.Sh NAME 4061f28255Scgd.Nm atexit 4161f28255Scgd.Nd register a function to be called on exit 42312aca53Sperry.Sh LIBRARY 43312aca53Sperry.Lb libc 4461f28255Scgd.Sh SYNOPSIS 45472351e1Swiz.In stdlib.h 4661f28255Scgd.Ft int 4761f28255Scgd.Fn atexit "void (*function)(void)" 4861f28255Scgd.Sh DESCRIPTION 4961f28255ScgdThe 5061f28255Scgd.Fn atexit 5161f28255Scgdfunction 5261f28255Scgdregisters the given 5361f28255Scgd.Ar function 5461f28255Scgdto be called at program exit, whether via 5561f28255Scgd.Xr exit 3 5661f28255Scgdor via return from the program's 5761f28255Scgd.Em main . 5861f28255ScgdFunctions so registered are called in reverse order; 5961f28255Scgdno arguments are passed. 6061f28255ScgdAt least 32 functions can always be registered, 6161f28255Scgdand more are allowed as long as sufficient memory can be allocated. 6261f28255Scgd.Sh RETURN VALUES 6361f28255Scgd.Rv -std atexit 6461f28255Scgd.Sh ERRORS 65a66bb899Sjtc.Bl -tag -width Er 6661f28255Scgd.It Bq Er ENOMEM 6761f28255ScgdNo memory was available to add the function to the list. 6861f28255ScgdThe existing list of functions is unmodified. 6961f28255Scgd.El 7061f28255Scgd.Sh SEE ALSO 71*afd81535Swiz.Xr at_quick_exit 3 , 72*afd81535Swiz.Xr exit 3 , 73f5c1f214Schristos.Xr quick_exit 3 7461f28255Scgd.Sh STANDARDS 7561f28255ScgdThe 7661f28255Scgd.Fn atexit 7761f28255Scgdfunction 7861f28255Scgdconforms to 7961f28255Scgd.St -ansiC . 80