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