112 lines
3.1 KiB
C
112 lines
3.1 KiB
C
/*-
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* Copyright (c) 2003 David Xu <davidxu@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include <errno.h>
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#include <signal.h>
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#include "un-namespace.h"
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#include "thr_private.h"
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int _sigaltstack(stack_t *_ss, stack_t *_oss);
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__weak_reference(_sigaltstack, sigaltstack);
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int
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_sigaltstack(stack_t *_ss, stack_t *_oss)
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{
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struct pthread *curthread = _get_curthread();
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stack_t ss, oss;
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int oonstack, errsave, ret;
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kse_critical_t crit;
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if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM) {
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crit = _kse_critical_enter();
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ret = __sys_sigaltstack(_ss, _oss);
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errsave = errno;
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/* Get a copy */
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if (ret == 0 && _ss != NULL)
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curthread->sigstk = *_ss;
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_kse_critical_leave(crit);
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errno = errsave;
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return (ret);
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}
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if (_ss)
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ss = *_ss;
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if (_oss)
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oss = *_oss;
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/* Should get and set stack in atomic way */
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crit = _kse_critical_enter();
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oonstack = _thr_sigonstack(&ss);
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if (_oss != NULL) {
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oss = curthread->sigstk;
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oss.ss_flags = (curthread->sigstk.ss_flags & SS_DISABLE)
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? SS_DISABLE : ((oonstack) ? SS_ONSTACK : 0);
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}
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if (_ss != NULL) {
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if (oonstack) {
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_kse_critical_leave(crit);
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errno = EPERM;
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return (-1);
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}
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if ((ss.ss_flags & ~SS_DISABLE) != 0) {
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_kse_critical_leave(crit);
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errno = EINVAL;
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return (-1);
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}
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if (!(ss.ss_flags & SS_DISABLE)) {
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if (ss.ss_size < MINSIGSTKSZ) {
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_kse_critical_leave(crit);
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errno = ENOMEM;
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return (-1);
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}
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curthread->sigstk = ss;
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} else {
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curthread->sigstk.ss_flags |= SS_DISABLE;
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}
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}
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_kse_critical_leave(crit);
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if (_oss != NULL)
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*_oss = oss;
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return (0);
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}
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int
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_thr_sigonstack(void *sp)
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{
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struct pthread *curthread = _get_curthread();
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return ((curthread->sigstk.ss_flags & SS_DISABLE) == 0 ?
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(((size_t)sp - (size_t)curthread->sigstk.ss_sp) < curthread->sigstk.ss_size)
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: 0);
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}
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