1.\" Copyright (c) 1990, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" the American National Standards Committee X3, on Information 6.\" Processing Systems. 7.\" 8.\" Redistribution and use in source and binary forms, with or without 9.\" modification, are permitted provided that the following conditions 10.\" are met: 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 2. Redistributions in binary form must reproduce the above copyright 14.\" notice, this list of conditions and the following disclaimer in the 15.\" documentation and/or other materials provided with the distribution. 16.\" 3. All advertising materials mentioning features or use of this software 17.\" must display the following acknowledgement: 18.\" This product includes software developed by the University of 19.\" California, Berkeley and its contributors. 20.\" 4. Neither the name of the University nor the names of its contributors 21.\" may be used to endorse or promote products derived from this software 22.\" without specific prior written permission. 23.\" 24.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34.\" SUCH DAMAGE. 35.\" 36.\" @(#)exit.3 8.1 (Berkeley) 6/4/93 37.\" $FreeBSD: src/lib/libc/stdlib/exit.3,v 1.6.2.4 2001/12/14 18:33:58 ru Exp $ 38.\" $DragonFly: src/lib/libc/stdlib/exit.3,v 1.3 2007/06/15 19:36:33 swildner Exp $ 39.\" 40.Dd June 15, 2007 41.Dt EXIT 3 42.Os 43.Sh NAME 44.Nm exit , 45.Nm _Exit 46.Nd perform normal program termination 47.Sh LIBRARY 48.Lb libc 49.Sh SYNOPSIS 50.In stdlib.h 51.Ft void 52.Fn exit "int status" 53.Ft void 54.Fn _Exit "int status" 55.Sh DESCRIPTION 56The 57.Fn exit 58and 59.Fn _Exit 60functions terminate a process. 61.Pp 62Before termination, 63.Fn exit 64performs the following functions in the order listed: 65.Bl -enum -offset indent 66.It 67Call the functions registered with the 68.Xr atexit 3 69function, in the reverse order of their registration. 70.It 71Flush all open output streams. 72.It 73Close all open streams. 74.It 75Unlink all files created with the 76.Xr tmpfile 3 77function. 78.El 79.Pp 80The C99 function 81.Fn _Exit 82terminates without calling the functions registered with 83.Xr atexit 3 84by just calling 85.Xr _exit 2 . 86Code intended to be portable should always use 87.Xr _exit 2 88directly as it is defined by 89.St -susv2 90as well. 91.Pp 92Passing arbitrary values back to the environment as 93.Ar status 94is considered bad style; 95you should use the values 96.Dv EXIT_SUCCESS 97and 98.Dv EXIT_FAILURE . 99If portability is not a concern, you may 100use the values described in 101.Xr sysexits 3 . 102.Sh RETURN VALUES 103The 104.Fn exit 105and 106.Fn _Exit 107functions never return. 108.Sh SEE ALSO 109.Xr _exit 2 , 110.Xr atexit 3 , 111.Xr intro 3 , 112.Xr sysexits 3 , 113.Xr tmpfile 3 114.Sh STANDARDS 115The 116.Fn exit 117and 118.Fn _Exit 119functions conform to 120.St -isoC-99 . 121