2 * Copyright (c) 2003 David Xu <davidxu@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
32 #include "thr_private.h"
34 __weak_reference(_sigaltstack, sigaltstack);
37 _sigaltstack(stack_t *_ss, stack_t *_oss)
39 struct pthread *curthread = _get_curthread();
41 int oonstack, errsave, ret;
44 if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM) {
45 crit = _kse_critical_enter();
46 ret = __sys_sigaltstack(_ss, _oss);
49 if (ret == 0 && _ss != NULL)
50 curthread->sigstk = *_ss;
51 _kse_critical_leave(crit);
61 /* Should get and set stack in atomic way */
62 crit = _kse_critical_enter();
63 oonstack = _thr_sigonstack(&ss);
65 oss = curthread->sigstk;
66 oss.ss_flags = (curthread->sigstk.ss_flags & SS_DISABLE)
67 ? SS_DISABLE : ((oonstack) ? SS_ONSTACK : 0);
72 _kse_critical_leave(crit);
76 if ((ss.ss_flags & ~SS_DISABLE) != 0) {
77 _kse_critical_leave(crit);
81 if (!(ss.ss_flags & SS_DISABLE)) {
82 if (ss.ss_size < MINSIGSTKSZ) {
83 _kse_critical_leave(crit);
87 curthread->sigstk = ss;
89 curthread->sigstk.ss_flags |= SS_DISABLE;
92 _kse_critical_leave(crit);
99 _thr_sigonstack(void *sp)
101 struct pthread *curthread = _get_curthread();
103 return ((curthread->sigstk.ss_flags & SS_DISABLE) == 0 ?
104 (((size_t)sp - (size_t)curthread->sigstk.ss_sp) < curthread->sigstk.ss_size)