1.\" Copyright (c) 1990, 1991 The Regents of the University of California. 2.\" 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. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" $OpenBSD: abort.3,v 1.11 2014/05/14 21:54:20 tedu Exp $ 33.\" 34.Dd $Mdocdate: May 14 2014 $ 35.Dt ABORT 3 36.Os 37.Sh NAME 38.Nm abort 39.Nd cause abnormal program termination 40.Sh SYNOPSIS 41.In stdlib.h 42.Ft void 43.Fn abort void 44.Sh DESCRIPTION 45The 46.Fn abort 47function causes abnormal program termination to occur, unless the signal 48.Dv SIGABRT 49is being caught and the signal handler does not return. 50.Pp 51Some implementations may flush output streams before terminating. 52This implementation does not. 53.Sh RETURN VALUES 54The 55.Fn abort 56function never returns. 57.Sh SEE ALSO 58.Xr sigaction 2 , 59.Xr exit 3 60.Sh STANDARDS 61The 62.Fn abort 63function conforms to 64.St -p1003.1-90 . 65.Sh HISTORY 66The 67.Fn abort 68function first appeared in 69.At v5 . 70.Pp 71Historically, previous standards required 72.Fn abort 73to flush and close output streams, but this conflicted with the requirement 74that 75.Fn abort 76be async signal safe. 77As a result, the flushing requirement was dropped. 78