ABORT(P) POSIX Programmer's Manual ABORT(P)
abort - generate an abnormal process abort
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() or waitpid() by abort() shall be that of a process
terminated by the SIGABRT signal. The abort() function shall override blocking or ignor-
ing 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 writer with a portable means to
abort processing, free from possible interference from any implementation-defined func-
The ISO/IEC 9899:1999 standard requires the abort() function to be async-signal-safe.
Since IEEE Std 1003.1-2001 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
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 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 IEEE Std 1003.1-2001 of a message catalog descriptor using a
standard I/O stream FILE object as would be expected by fclose().
exit() , kill() , raise() , signal() , wait() , waitpid() , the Base Definitions volume of
IEEE Std 1003.1-2001, <stdlib.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 ABORT(P)