libc: Add a copyright to quick_exit.c
[dragonfly.git] / lib / libc / stdlib / quick_exit.c
CommitLineData
a329a283
SW
1/*-
2* Copyright (c) 2012
3* The DragonFly Project. 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*
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
13* the documentation and/or other materials provided with the
14* distribution.
15* 3. Neither the name of The DragonFly Project nor the names of its
16* contributors may be used to endorse or promote products derived
17* from this software without specific, prior written permission.
18*
19* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
22* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
23* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
24* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
25* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
26* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
27* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
28* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
29* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30* SUCH DAMAGE.
31*/
22ab97ca
VS
32
33#include <stdlib.h>
34#include <unistd.h>
35
36#include "libc_private.h"
37#include "spinlock.h"
38
39
40struct quick_exit_fn {
41 struct quick_exit_fn *next;
42 void (*func)(void);
43};
44
45static struct quick_exit_fn *quick_exit_fns;
46static spinlock_t quick_exit_spinlock;
47
48/*
49 * at_quick_exit:
50 *
51 * Register a function to be called at quick_exit.
52 */
53int
54at_quick_exit(void (*func)(void))
55{
56 struct quick_exit_fn *fn;
57
58 fn = malloc(sizeof(struct quick_exit_fn));
59 if (!fn)
60 return (-1);
61
62 fn->func = func;
63
64 if (__isthreaded)
65 _SPINLOCK(&quick_exit_spinlock);
66
67 fn->next = quick_exit_fns;
68 quick_exit_fns = fn;
69
70 if (__isthreaded)
71 _SPINUNLOCK(&quick_exit_spinlock);
72
73 return (0);
74}
75
76/*
77 * quick_exit:
78 *
79 * Abandon a process. Execute all quick_exit handlers.
80 */
81void
82quick_exit(int status)
83{
84 struct quick_exit_fn *fn;
85
86 if (__isthreaded)
87 _SPINLOCK(&quick_exit_spinlock);
88 for (fn = quick_exit_fns; fn != NULL; fn = fn->next) {
89 fn->func();
90 }
91 if (__isthreaded)
92 _SPINUNLOCK(&quick_exit_spinlock);
93
94 _exit(status);
95}