152 lines
4.6 KiB
C
152 lines
4.6 KiB
C
/****************************************************************************
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* fs/aio/aio_signal.c
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*
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* Copyright (C) 2014-2015 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 <sys/types.h>
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#include <sched.h>
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#include <signal.h>
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#include <aio.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include "aio/aio.h"
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#ifdef CONFIG_FS_AIO
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: aio_signal
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*
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* Description:
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* Signal the client that an I/O has completed.
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*
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* Input Parameters:
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* pid - ID of the task to signal
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* aiocbp - Pointer to the asynchronous I/O state structure that includes
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* information about how to signal the client
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*
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* Returned Value:
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* Zero (OK) if the client was successfully signalled. Otherwise, a
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* negated errno value is returned.
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*
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* Assumptions:
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* This function runs only in the context of the worker thread.
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*
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****************************************************************************/
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int aio_signal(pid_t pid, FAR struct aiocb *aiocbp)
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{
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#ifdef CONFIG_CAN_PASS_STRUCTS
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union sigval value;
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#endif
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int errcode;
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int status;
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int ret;
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DEBUGASSERT(aiocbp);
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ret = OK; /* Assume success */
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/* Signal the client */
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if (aiocbp->aio_sigevent.sigev_notify == SIGEV_SIGNAL)
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{
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#ifdef CONFIG_CAN_PASS_STRUCTS
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status = sigqueue(pid, aiocbp->aio_sigevent.sigev_signo,
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aiocbp->aio_sigevent.sigev_value);
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#else
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status = sigqueue(pid, aiocbp->aio_sigevent.sigev_sign,
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aiocbp->aio_sigevent.sigev_value.sival_ptr);
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#endif
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if (status < 0)
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{
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errcode = get_errno();
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ferr("ERROR: sigqueue #1 failed: %d\n", errcode);
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ret = ERROR;
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}
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}
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#ifdef CONFIG_SIG_EVTHREAD
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/* Notify the client via a function call */
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else if (aiocbp->aio_sigevent.sigev_notify == SIGEV_THREAD)
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{
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ret = sig_notification(pid, &aiocbp->aio_sigevent);
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if (ret < 0)
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{
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ferr("ERROR: sig_notification failed: %d\n", ret);
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}
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}
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#endif
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/* Send the poll signal in any event in case the caller is waiting
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* on sig_suspend();
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*/
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#ifdef CONFIG_CAN_PASS_STRUCTS
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value.sival_ptr = aiocbp;
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status = sigqueue(pid, SIGPOLL, value);
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#else
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status = sigqueue(pid, SIGPOLL, aiocbp);
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#endif
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if (status && ret == OK)
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{
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errcode = get_errno();
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ferr("ERROR: sigqueue #2 failed: %d\n", errcode);
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ret = ERROR;
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}
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/* Make sure that errno is set correctly on return */
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if (ret < 0)
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{
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set_errno(errcode);
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return ERROR;
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}
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return OK;
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}
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#endif /* CONFIG_FS_AIO */
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