| .\" Copyright 2007 (C) Michael Kerrisk <mtk.manpages@gmail.com> |
| .\" some parts Copyright 1993 David Metcalfe (david@prism.demon.co.uk) |
| .\" |
| .\" %%%LICENSE_START(VERBATIM) |
| .\" Permission is granted to make and distribute verbatim copies of this |
| .\" manual provided the copyright notice and this permission notice are |
| .\" preserved on all copies. |
| .\" |
| .\" Permission is granted to copy and distribute modified versions of this |
| .\" manual under the conditions for verbatim copying, provided that the |
| .\" entire resulting derived work is distributed under the terms of a |
| .\" permission notice identical to this one. |
| .\" |
| .\" Since the Linux kernel and libraries are constantly changing, this |
| .\" manual page may be incorrect or out-of-date. The author(s) assume no |
| .\" responsibility for errors or omissions, or for damages resulting from |
| .\" the use of the information contained herein. The author(s) may not |
| .\" have taken the same level of care in the production of this manual, |
| .\" which is licensed free of charge, as they might when working |
| .\" professionally. |
| .\" |
| .\" Formatted or processed versions of this manual, if unaccompanied by |
| .\" the source, must acknowledge the copyright and authors of this work. |
| .\" %%%LICENSE_END |
| .\" |
| .\" 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 2021-03-22 "GNU" "Linux Programmer's Manual" |
| .SH NAME |
| abort \- cause abnormal process termination |
| .SH SYNOPSIS |
| .nf |
| .B #include <stdlib.h> |
| .PP |
| .B noreturn void abort(void); |
| .fi |
| .SH DESCRIPTION |
| The |
| .BR abort () |
| function 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). |
| .ad l |
| .nh |
| .TS |
| allbox; |
| lbx lb lb |
| l l l. |
| Interface Attribute Value |
| T{ |
| .BR abort () |
| T} Thread safety MT-Safe |
| .TE |
| .hy |
| .ad |
| .sp 1 |
| .SH CONFORMING TO |
| SVr4, POSIX.1-2001, POSIX.1-2008, 4.3BSD, C89, C99. |
| .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 SEE ALSO |
| .BR gdb (1), |
| .BR sigaction (2), |
| .BR assert (3), |
| .BR exit (3), |
| .BR longjmp (3), |
| .BR raise (3) |