PROLOG

       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of this interface
       may differ (consult the corresponding Linux manual page for details of Linux behavior), or the  interface
       may not be implemented on Linux.

NAME

       abort — generate an abnormal process abort

SYNOPSIS

       #include <stdlib.h>

       void abort(void);

DESCRIPTION

       The  functionality  described  on  this  reference  page is aligned with the ISO C standard. Any conflict
       between the requirements described  here  and  the  ISO C  standard  is  unintentional.  This  volume  of
       POSIX.1‐2008 defers to the ISO C standard.

       The  abort()  function  shall  cause  abnormal process termination to occur, unless the signal SIGABRT is
       being caught and the signal handler does not return.

       The abnormal termination processing shall include the default actions defined for SIGABRT and may include
       an attempt to effect fclose() on all open streams.

       The  SIGABRT  signal  shall  be  sent  to the calling process as if by means of raise() with the argument
       SIGABRT.

       The status made available to wait(), waitid(), or waitpid()  by  abort()  shall  be  that  of  a  process
       terminated  by  the SIGABRT signal.  The abort() function shall override blocking or ignoring the SIGABRT
       signal.

RETURN VALUE

       The abort() function shall not return.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       Catching the signal is intended to provide the application developer  with  a  portable  means  to  abort
       processing, free from possible interference from any implementation-supplied functions.

RATIONALE

       The  ISO/IEC 9899:1999 standard requires the abort() function to be async-signal-safe. Since POSIX.1‐2008
       defers to the ISO C standard, this required a change to the DESCRIPTION from ``shall include  the  effect
       of fclose()'' to ``may include an attempt to effect fclose().''

       The revised wording permits some backwards-compatibility and avoids a potential deadlock situation.

       The  Open  Group Base Resolution bwg2002‐003 is applied, removing the following XSI shaded paragraph from
       the DESCRIPTION:

       ``On XSI-conformant systems, in addition the abnormal termination processing shall include the effect  of
       fclose() on message catalog descriptors.''

       There were several reasons to remove this paragraph:

        *  No  special  processing  of  open  message  catalogs  needs to be performed prior to abnormal process
           termination.

        *  The main reason to specifically mention that abort() includes the effect of fclose() on open  streams
           is  to  flush  output  queued  on  the  stream.  Message  catalogs in this context are read-only and,
           therefore, do not need to be flushed.

        *  The effect of fclose() on a message catalog descriptor is unspecified.  Message  catalog  descriptors
           are  allowed,  but not required to be implemented using a file descriptor, but there is no mention in
           POSIX.1‐2008 of a message catalog descriptor using a standard I/O stream  FILE  object  as  would  be
           expected by fclose().

FUTURE DIRECTIONS

       None.

SEE ALSO

       exit(), kill(), raise(), signal(), wait(), waitid()

       The Base Definitions volume of POSIX.1‐2008, <stdlib.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition,
       Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open  Group  Base
       Specifications  Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers, Inc
       and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In  the  event
       of  any  discrepancy between this version and the original IEEE and The Open Group Standard, the original
       IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at
       http://www.unix.org/online.html .

       Any  typographical  or formatting errors that appear in this page are most likely to have been introduced
       during  the  conversion  of  the  source  files  to  man  page  format.  To  report  such   errors,   see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .