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.1‐2017 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.1‐2017, <stdlib.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard
       for Information  Technology  --  Portable  Operating  System  Interface  (POSIX),  The  Open  Group  Base
       Specifications  Issue  7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics
       Engineers, Inc and The Open Group.  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.opengroup.org/unix/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 .

IEEE/The Open Group                                   2017                                         ABORT(3POSIX)