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jcs's openbsd hax
openbsd
1/*
2 * Copyright (c) 2014 Philip Guenther <guenther@openbsd.org>
3 *
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17#include <pthread.h>
18#include <signal.h>
19#include <stdio.h>
20#include <string.h>
21#include <unistd.h>
22
23#include "thread_private.h"
24#include "rthread_cb.h"
25
26static __dead void
27_thread_canceled(void)
28{
29 pthread_exit(PTHREAD_CANCELED);
30}
31
32void
33_thread_set_callbacks(const struct thread_callbacks *cb, size_t len)
34{
35 sigset_t allmask, omask;
36
37 if (sizeof(*cb) != len) {
38 fprintf(stderr, "library mismatch: libc expected %zu but"
39 " libpthread gave %zu\n", sizeof(*cb), len);
40 fflush(stderr);
41 _exit(44);
42 }
43
44 sigfillset(&allmask);
45 if (sigprocmask(SIG_BLOCK, &allmask, &omask) == 0) {
46 /* mprotect RW */
47 memcpy(&_thread_cb, cb, sizeof(_thread_cb));
48
49 /*
50 * These are supplied by libc, but only enabled
51 * here when we actually need to prep for doing MT.
52 */
53 _thread_cb.tc_canceled = _thread_canceled;
54 _thread_cb.tc_malloc_lock = _thread_malloc_lock;
55 _thread_cb.tc_malloc_unlock = _thread_malloc_unlock;
56 _thread_cb.tc_atexit_lock = _thread_atexit_lock;
57 _thread_cb.tc_atexit_unlock = _thread_atexit_unlock;
58 _thread_cb.tc_atfork_lock = _thread_atfork_lock;
59 _thread_cb.tc_atfork_unlock = _thread_atfork_unlock;
60 _thread_cb.tc_arc4_lock = _thread_arc4_lock;
61 _thread_cb.tc_arc4_unlock = _thread_arc4_unlock;
62 _thread_cb.tc_mutex_lock = _thread_mutex_lock;
63 _thread_cb.tc_mutex_unlock = _thread_mutex_unlock;
64 _thread_cb.tc_mutex_destroy = _thread_mutex_destroy;
65 _thread_cb.tc_tag_lock = _thread_tag_lock;
66 _thread_cb.tc_tag_unlock = _thread_tag_unlock;
67 _thread_cb.tc_tag_storage = _thread_tag_storage;
68
69 /* mprotect RO | LOCKPERM | NOUNMAP */
70 sigprocmask(SIG_SETMASK, &omask, NULL);
71 }
72}