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 43 static 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 57 static 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