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/**
* Copyright (c) 2010-2012 Broadcom. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The names of the above-listed copyright holders may not be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* ALTERNATIVELY, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2, as published by the Free
* Software Foundation.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef VCHIQ_KILLABLE_H
#define VCHIQ_KILLABLE_H
#include <linux/mutex.h>
#include <linux/semaphore.h>
#define SHUTDOWN_SIGS (sigmask(SIGKILL) | sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGTRAP) | sigmask(SIGSTOP) | sigmask(SIGCONT))
static inline int __must_check down_interruptible_killable(struct semaphore *sem)
{
/* Allow interception of killable signals only. We don't want to be interrupted by harmless signals like SIGALRM */
int ret;
sigset_t blocked, oldset;
siginitsetinv(&blocked, SHUTDOWN_SIGS);
sigprocmask(SIG_SETMASK, &blocked, &oldset);
ret = down_interruptible(sem);
sigprocmask(SIG_SETMASK, &oldset, NULL);
return ret;
}
#define down_interruptible down_interruptible_killable
static inline int __must_check mutex_lock_interruptible_killable(struct mutex *lock)
{
/* Allow interception of killable signals only. We don't want to be interrupted by harmless signals like SIGALRM */
int ret;
sigset_t blocked, oldset;
siginitsetinv(&blocked, SHUTDOWN_SIGS);
sigprocmask(SIG_SETMASK, &blocked, &oldset);
ret = mutex_lock_interruptible(lock);
sigprocmask(SIG_SETMASK, &oldset, NULL);
return ret;
}
#define mutex_lock_interruptible mutex_lock_interruptible_killable
#endif
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