86 lines
3.6 KiB
C
86 lines
3.6 KiB
C
/****************************************************************************
|
|
* libc/termios/lib_tcflow.c
|
|
*
|
|
* Copyright (C) 2017 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <sys/ioctl.h>
|
|
|
|
#include <termios.h>
|
|
#include <errno.h>
|
|
|
|
#include <nuttx/serial/tioctl.h>
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: tcflow
|
|
*
|
|
* Description:
|
|
* The tcflow() function will suspend or restart transmission or reception
|
|
* of data on the object referred to by 'fd', depending on the value of
|
|
* 'action'.
|
|
*
|
|
* Input Parameters:
|
|
* fd - An open file descriptor associated with a terminal.
|
|
* action - Describes the action to be performed:
|
|
* TCOOFF - Output will be suspended.
|
|
* TCOON - Suspended output will be restarted.
|
|
* TCIOFF - The system will transmit a STOP character, which is
|
|
* intended to cause the terminal device to stop
|
|
* transmitting data to the system.
|
|
* TCION - The system will transmit a START character, which is
|
|
* intended to cause the terminal device to start
|
|
* transmitting data to the system.
|
|
*
|
|
* The default on the opening of a terminal file is that neither its input nor
|
|
* its output are suspended.
|
|
*
|
|
* Returned Value:
|
|
* Upon successful completion, 0 is returned. Otherwise, -1 is returned and
|
|
* errno is set to indicate the nature of the error.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int tcflow(int fd, int action)
|
|
{
|
|
return ioctl(fd, TCXONC, (unsigned long)action);
|
|
}
|