lib/libc/stdlib/exit.c

   1 /*-
   2  * Copyright (c) 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)exit.c   8.1 (Berkeley) 6/4/93
  30  * $FreeBSD: src/lib/libc/stdlib/exit.c,v 1.9 2007/01/09 00:28:09 imp Exp $
  31  * $DragonFly: src/lib/libc/stdlib/exit.c,v 1.8 2005/11/20 12:37:48 swildner Exp $
  32  */
  33
  34 #include "namespace.h"
  35 #include <stdlib.h>
  36 #include <unistd.h>
  37 #include "un-namespace.h"
  38
  39 #include "atexit.h"
  40 #include "libc_private.h"
  41
  42 void (*__cleanup)(void);
  43
  44 /*
  45  * This variable is zero until a process has created a thread.
  46  * It is used to avoid calling locking functions in libc when they
  47  * are not required. By default, libc is intended to be(come)
  48  * thread-safe, but without a (significant) penalty to non-threaded
  49  * processes.
  50  */
  51 int     __isthreaded    = 0;
  52
  53 /*
  54  * Exit, flushing stdio buffers if necessary.
  55  */
  56 void
  57 exit(int status)
  58 {
  59         /* Ensure that the auto-initialization routine is linked in: */
  60         extern int _thread_autoinit_dummy_decl;
  61
  62         _thread_autoinit_dummy_decl = 1;
  63
  64         __cxa_finalize(NULL);
  65         if (__cleanup)
  66                 (*__cleanup)();
  67         _exit(status);
  68 }
  69
  70 /*
  71  * ISO C99 added the _Exit() function that results in immediate program
  72  * termination without triggering signals or atexit()-registered functions.
  73  * In POSIX this is equivalent to the _exit() function.
  74  */
  75 void
  76 _Exit(int status)
  77 {
  78         _exit(status);
  79 }