86 lines
3.6 KiB
C
86 lines
3.6 KiB
C
/****************************************************************************
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* libc/termios/lib_tcflow.c
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*
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* Copyright (C) 2017 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/ioctl.h>
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#include <termios.h>
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#include <errno.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: tcflow
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*
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* Descripton:
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* The tcflow() function will suspend or restart transmission or reception
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* of data on the object referred to by 'fd', depending on the value of
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* 'action'.
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*
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* Input Parameters:
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* fd - An open file descriptor associated with a terminal.
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* action - Describes the action to be performed:
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* TCOOFF - Output will be suspended.
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* TCOON - Suspended output will be restarted.
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* TCIOFF - The system will transmit a STOP character, which is
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* intended to cause the terminal device to stop
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* transmitting data to the system.
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* TCION - The system will transmit a START character, which is
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* intended to cause the terminal device to start
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* transmitting data to the system.
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*
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* The default on the opening of a terminal file is that neither its input nor
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* its output are suspended.
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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 nature of the error.
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*
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****************************************************************************/
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int tcflow(int fd, int action)
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{
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return ioctl(fd, TCXONC, (unsigned long)action);
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}
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