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 #include <linux/mutex.h>
38 #include <linux/semaphore.h>
39
40 #define SHUTDOWN_SIGS (sigmask(SIGKILL) | sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGTRAP) | sigmask(SIGSTOP) | sigmask(SIGCONT))
41
down_interruptible_killable(struct semaphore * sem)42 static inline int __must_check down_interruptible_killable(struct semaphore *sem)
43 {
44 /* Allow interception of killable signals only. We don't want to be interrupted by harmless signals like SIGALRM */
45 int ret;
46 sigset_t blocked, oldset;
47 siginitsetinv(&blocked, SHUTDOWN_SIGS);
48 sigprocmask(SIG_SETMASK, &blocked, &oldset);
49 ret = down_interruptible(sem);
50 sigprocmask(SIG_SETMASK, &oldset, NULL);
51 return ret;
52 }
53 #define down_interruptible down_interruptible_killable
54
55
mutex_lock_interruptible_killable(struct mutex * lock)56 static inline int __must_check mutex_lock_interruptible_killable(struct mutex *lock)
57 {
58 /* Allow interception of killable signals only. We don't want to be interrupted by harmless signals like SIGALRM */
59 int ret;
60 sigset_t blocked, oldset;
61 siginitsetinv(&blocked, SHUTDOWN_SIGS);
62 sigprocmask(SIG_SETMASK, &blocked, &oldset);
63 ret = mutex_lock_interruptible(lock);
64 sigprocmask(SIG_SETMASK, &oldset, NULL);
65 return ret;
66 }
67 #define mutex_lock_interruptible mutex_lock_interruptible_killable
68
69 #endif
70