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       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                 :            : 
      42                 :          0 : 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                 :          0 :         sigprocmask(SIG_SETMASK, &blocked, &oldset);
      49                 :          0 :         ret = down_interruptible(sem);
      50                 :          0 :         sigprocmask(SIG_SETMASK, &oldset, NULL);
      51                 :          0 :         return ret;
      52                 :            : }
      53                 :            : #define down_interruptible down_interruptible_killable
      54                 :            : 
      55                 :            : #endif