stdlib/FreeBSD/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  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #if defined(LIBC_SCCS) && !defined(lint)
  35 static char sccsid[] = "@(#)exit.c      8.1 (Berkeley) 6/4/93";
  36 #endif /* LIBC_SCCS and not lint */
  37 #include <sys/cdefs.h>
  38 __FBSDID("$FreeBSD: src/lib/libc/stdlib/exit.c,v 1.6 2002/03/22 21:53:10 obrien Exp $");
  39
  40 #include "namespace.h"
  41 #include <stdlib.h>
  42 #include <unistd.h>
  43 #include "un-namespace.h"
  44 #include "atexit.h"
  45
  46 void (*__cleanup)();
  47
  48 /*
  49  * This variable is zero until a process has created a thread.
  50  * It is used to avoid calling locking functions in libc when they
  51  * are not required. By default, libc is intended to be(come)
  52  * thread-safe, but without a (significant) penalty to non-threaded
  53  * processes.
  54  */
  55 int     __isthreaded    = 0;
  56
  57 /*
  58  * Exit, flushing stdio buffers if necessary.
  59  */
  60 void
  61 exit(status)
  62         int status;
  63 {
  64         struct atexit *p;
  65         int n;
  66
  67         /* Ensure that the auto-initialization routine is linked in: */
  68         extern int _thread_autoinit_dummy_decl;
  69
  70         _thread_autoinit_dummy_decl = 1;
  71
  72         for (p = __atexit; p; p = p->next)
  73                 for (n = p->ind; --n >= 0;)
  74                         (*p->fns[n])();
  75         if (__cleanup)
  76                 (*__cleanup)();
  77         _exit(status);
  78 }