ABORT(3POSIX) POSIX Programmer's Manual ABORT(3POSIX)
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.
abort — generate an abnormal process abort
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
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.
The abort() function shall not return.
No errors are defined.
The following sections are informative.
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
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
The revised wording permits some backwards-compatibility and avoids a potential deadlock
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
* 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 con‐
text 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 stan‐
dard I/O stream FILE object as would be expected by fclose().
exit(), kill(), raise(), signal(), wait(), waitid()
The Base Definitions volume of POSIX.1‐2008, <stdlib.h>
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 discrep‐
ancy 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 .
IEEE/The Open Group 2013 ABORT(3POSIX)