php man page for abort

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)