1.\" $NetBSD: exit.3,v 1.16 2013/04/26 18:29:55 christos Exp $ 2.\" 3.\" Copyright (c) 1990, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" This code is derived from software contributed to Berkeley by 7.\" the American National Standards Committee X3, on Information 8.\" Processing Systems. 9.\" 10.\" Redistribution and use in source and binary forms, with or without 11.\" modification, are permitted provided that the following conditions 12.\" are met: 13.\" 1. Redistributions of source code must retain the above copyright 14.\" notice, this list of conditions and the following disclaimer. 15.\" 2. Redistributions in binary form must reproduce the above copyright 16.\" notice, this list of conditions and the following disclaimer in the 17.\" documentation and/or other materials provided with the distribution. 18.\" 3. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" from: @(#)exit.3 8.1 (Berkeley) 6/4/93 35.\" 36.Dd January 2, 2012 37.Dt EXIT 3 38.Os 39.Sh NAME 40.Nm exit 41.Nd perform normal program termination 42.Sh LIBRARY 43.Lb libc 44.Sh SYNOPSIS 45.In stdlib.h 46.Ft void 47.Fn exit "int status" 48.Sh DESCRIPTION 49.Fn exit 50terminates a process. 51The 52.Fa status 53values 54.Dv EXIT_SUCCESS 55and 56.Dv EXIT_FAILURE 57can be used to indicate successful and unsuccessful 58termination, respectively. 59.Pp 60Before termination it performs the following functions in the 61order listed: 62.Bl -enum -offset indent 63.It 64Call the functions registered with the 65.Xr atexit 3 66function, in the reverse order of their registration. 67.It 68Flush all open output streams. 69.It 70Close all open streams. 71.It 72Unlink all files created with the 73.Xr tmpfile 3 74function. 75.El 76.Pp 77Following this, 78.Fn exit 79calls 80.Xr _exit 2 . 81.Sh RESTRICTIONS 82Standard C guarantees only that the values zero, 83.Dv EXIT_SUCCESS , 84and 85.Dv EXIT_FAILURE 86produce meaningful results. 87POSIX extends this to guarantee that the 88least significant 8 bits of 89.Fa status 90are preserved and returned to the parent via 91.Xr wait 2 . 92Values outside the supported range 0-255 are bitwise-truncated; therefore, 93negative values should not be used. 94.Sh RETURN VALUES 95The 96.Fn exit 97function 98never returns. 99.Sh SEE ALSO 100.Xr _exit 2 , 101.Xr at_quick_exit 3 , 102.Xr atexit 3 , 103.Xr intro 3 , 104.Xr quick_exit 3 , 105.Xr tmpfile 3 106.Sh STANDARDS 107The 108.Fn exit 109function 110conforms to 111.St -ansiC . 112