102 lines
3.5 KiB
C
102 lines
3.5 KiB
C
/****************************************************************************
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* drivers/serial/tcdrain.c
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*
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* Copyright (C) 2017 Gregory Nutt. All rights reserved.
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* Copyright (C) 2017 Sebastien Lorquet. All rights reserved.
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* Author: Sebastien Lorquet <sebastien@lorquet.fr>
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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/ioctl.h>
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#include <termios.h>
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#include <errno.h>
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#include <nuttx/cancelpt.h>
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#include <nuttx/serial/tioctl.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: tcdrain
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*
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* Description:
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* Function for draining the output buffer of a terminal/serial device
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*
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* Input Parameters:
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* fd - The 'fd' argument is an open file descriptor associated with a terminal.
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*
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* Returned Value:
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* Upon successful completion, 0 is returned. Otherwise, -1 is returned and
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* errno is set to indicate the error.
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*
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****************************************************************************/
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int tcdrain(int fd)
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{
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int ret;
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/* tcdrain is a cancellation point */
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if (enter_cancellation_point())
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{
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#ifdef CONFIG_CANCELLATION_POINTS
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/* If there is a pending cancellation, then do not perform
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* the wait. Exit now with ECANCELED.
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*/
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set_errno(ECANCELED);
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leave_cancellation_point();
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return ERROR;
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#endif
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}
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/* Perform the TCDRM IOCTL command. It is safe to use the file descriptor
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* in this context because we are executing on the calling application's
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* thread.
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*
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* NOTE: ioctl() will set the errno variable and return ERROR is any error
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* occurs.
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*/
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ret = ioctl(fd, TCDRN, (unsigned long)0);
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leave_cancellation_point();
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return ret;
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}
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