.\" Copyright 2007 (C) Michael Kerrisk <mtk.manpages@gmail.com>

.\" some parts Copyright 1993 David Metcalfe (david@prism.demon.co.uk)

.\"

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.\" References consulted:

.\"     Linux libc source code

.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)

.\"     386BSD man pages

.\" Modified Sat Jul 24 21:46:21 1993 by Rik Faith (faith@cs.unc.edu)

.\" Modified Fri Aug  4 10:51:53 2000 - patch from Joseph S. Myers

.\" 2007-12-15, mtk, Mostly rewritten

.\"

.TH ABORT 3  2017-11-26 "GNU" "Linux Programmer's Manual"

.SH NAME

abort \- cause abnormal process termination

.SH SYNOPSIS

.nf

.B #include <stdlib.h>

.PP

.B void abort(void);

.fi

.SH DESCRIPTION

The

.BR abort ()

first unblocks the

.B SIGABRT

signal, and then raises that signal for the calling process

(as though

.BR raise (3)

was called).

This results in the abnormal termination of the process unless the

.B SIGABRT

signal is caught and the signal handler does not return

(see

.BR longjmp (3)).

.PP

If the

.B SIGABRT

signal is ignored, or caught by a handler that returns, the

.BR abort ()

function will still terminate the process.

It does this by restoring the default disposition for

.B SIGABRT

and then raising the signal for a second time.

.SH RETURN VALUE

The

.BR abort ()

function never returns.

.SH ATTRIBUTES

For an explanation of the terms used in this section, see

.BR attributes (7).

.TS

allbox;

lb lb lb

l l l.

Interface	Attribute	Value

T{

.BR abort ()

T}	Thread safety	MT-Safe

.TE

.SH NOTES

Up until glibc 2.26,

if the

.BR abort ()

function caused process termination,

all open streams were closed and flushed (as with

.BR fclose (3)).

However, in some cases this could result in deadlocks and data corruption.

Therefore, starting with glibc 2.27,

.\" glibc commit 91e7cf982d0104f0e71770f5ae8e3faf352dea9f

.BR abort ()

terminates the process without flushing streams.

POSIX.1 permits either possible behavior, saying that

.BR abort ()

"may include an attempt to effect fclose() on all open streams".

.SH CONFORMING TO

SVr4, POSIX.1-2001, POSIX.1-2008, 4.3BSD, C89, C99.

.SH SEE ALSO

.BR gdb (1),

.BR sigaction (2),

.BR assert (3),

.BR exit (3),

.BR longjmp (3),

.BR raise (3)

.SH COLOPHON

This page is part of release 4.15 of the Linux

.I man-pages

project.

A description of the project,

information about reporting bugs,

and the latest version of this page,

can be found at

\%https://www.kernel.org/doc/man\-pages/.