LXR linux/drivers/staging/vc04_services/interface/vchiq_arm/vchiq

   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
  42static 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#endif
  56