abort(3) [opendarwin man page]

ABORT(3)						     Linux Programmer's Manual							  ABORT(3)

NAME

       abort - cause abnormal process termination

SYNOPSIS

       #include <stdlib.h>

       void abort(void);

DESCRIPTION

       The  abort()  first unblocks the SIGABRT signal, and then raises that signal for the calling process (as though raise(3) was called).  This
       results in the abnormal termination of the process unless the SIGABRT signal is	caught	and  the  signal  handler  does  not  return  (see
       longjmp(3)).

       If the SIGABRT signal is ignored, or caught by a handler that returns, the abort() function will still terminate the process.  It does this
       by restoring the default disposition for SIGABRT and then raising the signal for a second time.

RETURN VALUE

       The abort() function never returns.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +----------+---------------+---------+
       |Interface | Attribute	  | Value   |
       +----------+---------------+---------+
       |abort()   | Thread safety | MT-Safe |
       +----------+---------------+---------+
NOTES

       Up until glibc 2.26, if the abort() function caused process termination, all open streams were closed  and  flushed  (as  with  fclose(3)).
       However,  in  some  cases  this could result in deadlocks and data corruption.  Therefore, starting with glibc 2.27, abort() terminates the
       process without flushing streams.  POSIX.1 permits either possible behavior, saying that abort() "may include an attempt to effect fclose()
       on all open streams".

CONFORMING TO

       SVr4, POSIX.1-2001, POSIX.1-2008, 4.3BSD, C89, C99.

SEE ALSO

       gdb(1), sigaction(2), assert(3), exit(3), longjmp(3), raise(3)

COLOPHON

       This  page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

GNU
								    2017-11-26								  ABORT(3)

ABORT(3P)						     POSIX Programmer's Manual							 ABORT(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing 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 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() or waitpid() by abort() shall be that of a process terminated by the SIGABRT signal.  The abort() func-
       tion 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 writer with a portable means to abort processing, free from possible interfer-
       ence from any implementation-defined functions.

RATIONALE

       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  stan-
       dard,  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 IEEE Std 1003.1-2001 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(), waitpid(), the Base Definitions volume of IEEE Std 1003.1-2001, <stdlib.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- 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 original Standard can be obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003								 ABORT(3P)