1/**
2 * Copyright (c) 2010-2012 Broadcom. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions, and the following disclaimer,
9 *    without modification.
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.
13 * 3. The names of the above-listed copyright holders may not be used
14 *    to endorse or promote products derived from this software without
15 *    specific prior written permission.
16 *
17 * ALTERNATIVELY, this software may be distributed under the terms of the
18 * GNU General Public License ("GPL") version 2, as published by the Free
19 * Software Foundation.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
22 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
23 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
25 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
28 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34#ifndef VCHIQ_KILLABLE_H
35#define VCHIQ_KILLABLE_H
36
37#ifdef notyet
38#include <linux/mutex.h>
39#include <linux/semaphore.h>
40
41#define SHUTDOWN_SIGS   (sigmask(SIGKILL) | sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGTRAP) | sigmask(SIGSTOP) | sigmask(SIGCONT))
42
43static inline int __must_check down_interruptible_killable(struct semaphore *sem)
44{
45	/* Allow interception of killable signals only. We don't want to be interrupted by harmless signals like SIGALRM */
46	int ret;
47	sigset_t blocked, oldset;
48	siginitsetinv(&blocked, SHUTDOWN_SIGS);
49	sigprocmask(SIG_SETMASK, &blocked, &oldset);
50	ret = down_interruptible(sem);
51	sigprocmask(SIG_SETMASK, &oldset, NULL);
52	return ret;
53}
54#define down_interruptible down_interruptible_killable
55
56
57static inline int __must_check mutex_lock_interruptible_killable(struct mutex *lock)
58{
59	/* Allow interception of killable signals only. We don't want to be interrupted by harmless signals like SIGALRM */
60	int ret;
61	sigset_t blocked, oldset;
62	siginitsetinv(&blocked, SHUTDOWN_SIGS);
63	sigprocmask(SIG_SETMASK, &blocked, &oldset);
64	ret = mutex_lock_interruptible(lock);
65	sigprocmask(SIG_SETMASK, &oldset, NULL);
66	return ret;
67}
68#define mutex_lock_interruptible mutex_lock_interruptible_killable
69
70#endif
71
72#endif
73