1 /* Copyright (C) 1992-2014 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
20 #include <hurd/signal.h>
22 /* Run signals handlers on the stack specified by SS (if not NULL).
23 If OSS is not NULL, it is filled in with the old signal stack status. */
25 __sigaltstack (argss, oss)
26 const struct sigaltstack *argss;
27 struct sigaltstack *oss;
29 struct hurd_sigstate *s;
30 struct sigaltstack ss, old;
32 /* Fault before taking any locks. */
36 *(volatile struct sigaltstack *) oss = *oss;
38 s = _hurd_self_sigstate ();
39 __spin_lock (&s->lock);
42 (ss.ss_flags & SS_DISABLE) && (s->sigaltstack.ss_flags & SS_ONSTACK))
44 /* Can't disable a stack that is in use. */
45 __spin_unlock (&s->lock);
55 __spin_unlock (&s->lock);
62 weak_alias (__sigaltstack, sigaltstack)