92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
/****************************************************************************
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* sched/signal/sig_pause.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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#include <errno.h>
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#include <nuttx/signal.h>
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#include <nuttx/cancelpt.h>
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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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int ret;
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/* pause() is a cancellation point */
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enter_cancellation_point();
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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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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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ret = nxsig_waitinfo(&set, NULL);
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if (ret < 0)
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{
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set_errno(-ret);
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ret = ERROR;
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}
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leave_cancellation_point();
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return ret;
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}
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