110 lines
3.3 KiB
C
110 lines
3.3 KiB
C
/****************************************************************************
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* examples/nxhello/nxhello_bkgd.c
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*
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* Copyright (C) Gregory Nutt. All rights reserved.
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* Author: Alan Carvalho de Assisi <acassis@gmail.com>
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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 <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <nuttx/serial/pty.h>
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/****************************************************************************
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* pty_test_main
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****************************************************************************/
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#ifdef CONFIG_BUILD_KERNEL
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int main(int argc, FAR char *argv[])
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#else
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int pty_test_main(int argc, char *argv[])
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#endif
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{
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char buffer[16];
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int ret;
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int fd;
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/* Open the pseudo-terminal master multiplexor (pmtx) */
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fd = open("/dev/ptmx", O_RDWR | O_NOCTTY);
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if (fd < 0)
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{
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fprintf(stderr, "ERROR: Failed to open /dev/ptmx: %d\n", errno);
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return -1;
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}
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/* Grant access and unlock the slave device */
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ret = grantpt(fd);
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if (ret < 0)
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{
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fprintf(stderr, "ERROR: grantpt() failed: %d\n", errno);
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close(fd);
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return -1;
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}
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ret = unlockpt(fd);
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if (ret < 0)
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{
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fprintf(stderr, "ERROR: unlockpt() failed: %d\n", errno);
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close(fd);
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return -1;
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}
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/* Get the slave device path */
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ptsname_r(fd, buffer, 16);
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printf("Slave device: %s\n", buffer);
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/* Loop forever, echoing anything received from the slave */
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for (; ; )
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{
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ssize_t nread;
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char ch;
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nread = read(fd, &ch, 1);
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UNUSED(nread);
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putchar(ch);
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ch = '\0';
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}
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return 0;
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}
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