man3/abort.3

   1 .\" Copyright 2007 (C) Michael Kerrisk <mtk.manpages@gmail.com>
   2 .\" some parts Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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  26 .\" References consulted:
  27 .\"     Linux libc source code
  28 .\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
  29 .\"     386BSD man pages
  30 .\" Modified Sat Jul 24 21:46:21 1993 by Rik Faith (faith@cs.unc.edu)
  31 .\" Modified Fri Aug  4 10:51:53 2000 - patch from Joseph S. Myers
  32 .\" 2007-12-15, mtk, Mostly rewritten
  33 .\"
  34 .TH ABORT 3  2017-11-26 "GNU" "Linux Programmer's Manual"
  35 .SH NAME
  36 abort \- cause abnormal process termination
  37 .SH SYNOPSIS
  38 .nf
  39 .B #include <stdlib.h>
  40 .PP
  41 .B void abort(void);
  42 .fi
  43 .SH DESCRIPTION
  44 The
  45 .BR abort ()
  46 first unblocks the
  47 .B SIGABRT
  48 signal, and then raises that signal for the calling process
  49 (as though
  50 .BR raise (3)
  51 was called).
  52 This results in the abnormal termination of the process unless the
  53 .B SIGABRT
  54 signal is caught and the signal handler does not return
  55 (see
  56 .BR longjmp (3)).
  57 .PP
  58 If the
  59 .B SIGABRT
  60 signal is ignored, or caught by a handler that returns, the
  61 .BR abort ()
  62 function will still terminate the process.
  63 It does this by restoring the default disposition for
  64 .B SIGABRT
  65 and then raising the signal for a second time.
  66 .SH RETURN VALUE
  67 The
  68 .BR abort ()
  69 function never returns.
  70 .SH ATTRIBUTES
  71 For an explanation of the terms used in this section, see
  72 .BR attributes (7).
  73 .TS
  74 allbox;
  75 lb lb lb
  76 l l l.
  77 Interface       Attribute       Value
  78 T{
  79 .BR abort ()
  80 T}      Thread safety   MT-Safe
  81 .TE
  82 .SH NOTES
  83 Up until glibc 2.26,
  84 if the
  85 .BR abort ()
  86 function caused process termination,
  87 all open streams were closed and flushed (as with
  88 .BR fclose (3)).
  89 However, in some cases this could result in deadlocks and data corruption.
  90 Therefore, starting with glibc 2.27,
  91 .\" glibc commit 91e7cf982d0104f0e71770f5ae8e3faf352dea9f
  92 .BR abort ()
  93 terminates the process without flushing streams.
  94 POSIX.1 permits either possible behavior, saying that
  95 .BR abort ()
  96 "may include an attempt to effect fclose() on all open streams".
  97 .SH CONFORMING TO
  98 SVr4, POSIX.1-2001, POSIX.1-2008, 4.3BSD, C89, C99.
  99 .SH SEE ALSO
 100 .BR gdb (1),
 101 .BR sigaction (2),
 102 .BR assert (3),
 103 .BR exit (3),
 104 .BR longjmp (3),
 105 .BR raise (3)