newlib/libc/stdlib/quick_exit.c

   1 /*-
   2  * Copyright (c) 2011 David Chisnall
   3  * Copyright (c) 2015 embedded brains GmbH
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  * $FreeBSD$
  28  */
  29
  30 #include <stdlib.h>
  31 #include <unistd.h>
  32 #include <sys/lock.h>
  33
  34 /**
  35  * Linked list of quick exit handlers.  This is simpler than the atexit()
  36  * version, because it is not required to support C++ destructors or
  37  * DSO-specific cleanups.
  38  */
  39 struct quick_exit_handler {
  40         struct quick_exit_handler *next;
  41         void (*cleanup)(void);
  42 };
  43
  44 /**
  45  * Lock protecting the handlers list.
  46  */
  47 #ifndef __SINGLE_THREAD__
  48 __LOCK_INIT(static, __at_quick_exit_mutex);
  49 #endif
  50 /**
  51  * Stack of cleanup handlers.  These will be invoked in reverse order when
  52  */
  53 static struct quick_exit_handler *handlers;
  54
  55 int
  56 at_quick_exit(void (*func)(void))
  57 {
  58         struct quick_exit_handler *h;
  59
  60         h = malloc(sizeof(*h));
  61
  62         if (NULL == h)
  63                 return (1);
  64         h->cleanup = func;
  65 #ifndef __SINGLE_THREAD__
  66         __lock_acquire(__at_quick_exit_mutex);
  67 #endif
  68         h->next = handlers;
  69         handlers = h;
  70 #ifndef __SINGLE_THREAD__
  71         __lock_release(__at_quick_exit_mutex);
  72 #endif
  73         return (0);
  74 }
  75
  76 void
  77 quick_exit(int status)
  78 {
  79         struct quick_exit_handler *h;
  80
  81         /*
  82          * XXX: The C++ spec requires us to call std::terminate if there is an
  83          * exception here.
  84          */
  85         for (h = handlers; NULL != h; h = h->next)
  86                 h->cleanup();
  87         _exit(status);
  88 }