111 lines
4.4 KiB
C
111 lines
4.4 KiB
C
/****************************************************************************
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* sched/pause.c
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*
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* Copyright (C) 2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <unistd.h>
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#include <signal.h>
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/****************************************************************************
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* Preprocessor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Type Definitions
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****************************************************************************/
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/****************************************************************************
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* Global Variables
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****************************************************************************/
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/****************************************************************************
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* Private Variables
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pause
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*
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* Description:
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* The pause() function will suspend the calling thread until delivery of a
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* non-blocked signal.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* Since pause() suspends thread execution indefinitely unless interrupted
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* a signal, there is no successful completion return value. A value of -1
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* will always be returned and errno set to indicate the error (EINTR).
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*
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* POSIX compatibility:
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* In the POSIX description of this function is the pause() function will
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* suspend the calling thread until delivery of a signal whose action is
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* either to execute a signal-catching function or to terminate the
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* process. This implementation only waits for any non-blocked signal
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* to be received.
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*
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****************************************************************************/
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int pause(void)
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{
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sigset_t set;
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struct siginfo value;
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/* Set up for the sleep. Using the empty set means that we are not
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* waiting for any particular signal. However, any unmasked signal
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* can still awaken sigtimedwait().
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*/
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(void)sigemptyset(&set);
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/* sigtwaitinfo() cannot succeed. It should always return error EINTR
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* meaning that some unblocked signal was caught.
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*/
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return sigwaitinfo(&set, &value);
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}
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