lib/libc/stdlib/quick_exit.c

   1 /*      $NetBSD: quick_exit.c,v 1.1 2013/04/26 18:29:55 christos Exp $  */
   2
   3 /*-
   4  * Copyright (c) 2011 David Chisnall
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * $FreeBSD: src/lib/libc/stdlib/quick_exit.c,v 1.4 2012/11/17 01:49:41 svnexp Exp $
  29  */
  30 #include <sys/cdefs.h>
  31 __RCSID("$NetBSD: quick_exit.c,v 1.1 2013/04/26 18:29:55 christos Exp $");
  32
  33 #include "namespace.h"
  34 #include "reentrant.h"
  35
  36 #include <stdlib.h>
  37
  38 /**
  39  * Linked list of quick exit handlers.  This is simpler than the atexit()
  40  * version, because it is not required to support C++ destructors or
  41  * DSO-specific cleanups.
  42  */
  43 struct quick_exit_handler {
  44         struct quick_exit_handler *next;
  45         void (*cleanup)(void);
  46 };
  47
  48 /**
  49  * Lock protecting the handlers list.
  50  */
  51 #ifdef _REENTRANT
  52 extern mutex_t __atexit_mutex;
  53 #endif
  54
  55 /**
  56  * Stack of cleanup handlers.  These will be invoked in reverse order when
  57  */
  58 static struct quick_exit_handler *handlers;
  59
  60 int
  61 at_quick_exit(void (*func)(void))
  62 {
  63         struct quick_exit_handler *h;
  64
  65         h = malloc(sizeof(*h));
  66
  67         if (NULL == h)
  68                 return 1;
  69         h->cleanup = func;
  70 #ifdef _REENTRANT
  71         mutex_lock(&__atexit_mutex);
  72 #endif
  73         h->next = handlers;
  74         handlers = h;
  75 #ifdef _REENTRANT
  76         mutex_unlock(&__atexit_mutex);
  77 #endif
  78         return 0;
  79 }
  80
  81 void
  82 quick_exit(int status)
  83 {
  84         struct quick_exit_handler *h;
  85
  86         /*
  87          * XXX: The C++ spec requires us to call std::terminate if there is an
  88          * exception here.
  89          */
  90         for (h = handlers; NULL != h; h = h->next)
  91                 (*h->cleanup)();
  92         _Exit(status);
  93 }