413 lines
10 KiB
C
413 lines
10 KiB
C
/****************************************************************************
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* examples/pty_test/pty_test.c
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*
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* Copyright (C) 2016, 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 <nuttx/config.h>
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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 <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <termios.h>
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#include <poll.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/ioctl.h>
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#include <nuttx/serial/pty.h>
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#include "nshlib/nshlib.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifndef CONFIG_EXAMPLES_PTYTEST_SERIALDEV
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# define CONFIG_EXAMPLES_PTYTEST_SERIALDEV "/dev/ttyS1"
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#endif
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#ifndef CONFIG_EXAMPLES_PTYTEST_DAEMONPRIO
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# define CONFIG_EXAMPLES_PTYTEST_DAEMONPRIO SCHED_PRIORITY_DEFAULT
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#endif
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#ifndef CONFIG_EXAMPLES_PTYTEST_STACKSIZE
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# define CONFIG_EXAMPLES_PTYTEST_STACKSIZE 2048
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#endif
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#define POLL_TIMEOUT 200
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/****************************************************************************
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* Private Data
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****************************************************************************/
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struct term_pair_s
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{
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int fd_uart;
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int fd_pty;
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: serial_in
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*
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* Description:
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* Read data from serial and write to pts
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*
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****************************************************************************/
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static void serial_in(struct term_pair_s *tp)
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{
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#ifdef CONFIG_EXAMPLES_PTYTEST_POLL
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struct pollfd fdp;
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#endif
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char buffer[16];
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int ret;
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if (!tp)
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{
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fprintf(stderr, "ERROR: terminal pair struct is NULL!\n");
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return;
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}
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#ifdef CONFIG_EXAMPLES_PTYTEST_POLL
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fdp.fd = tp->fd_uart;
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fdp.events = POLLIN;
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#endif
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/* Run forever */
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for (;;)
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{
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#ifdef CONFIG_EXAMPLES_PTYTEST_POLL
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ret = poll((struct pollfd *)&fdp, 1, POLL_TIMEOUT);
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if (ret > 0)
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{
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if ((fdp.revents & POLLIN) != 0)
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#endif
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{
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ssize_t len;
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len = read(tp->fd_uart, buffer, 16);
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if (len < 0)
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{
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fprintf(stderr,
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"ERROR Failed to read from serial: %d\n",
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errno);
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}
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else if (len > 0)
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{
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ret = write(tp->fd_pty, buffer, len);
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if (ret < 0)
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{
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fprintf(stderr,
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"Failed to write to serial: %d\n",
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errno);
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}
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}
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}
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#ifdef CONFIG_EXAMPLES_PTYTEST_POLL
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}
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/* Timeout */
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else if (ret == 0)
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{
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continue;
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}
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/* Poll error */
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else if (ret < 0)
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{
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fprintf(stderr, "ERROR: poll failed: %d\n", errno);
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continue;
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}
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#endif
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}
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}
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/****************************************************************************
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* Name: serial_out
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*
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* Description:
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* Read data from pts and write to serial
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*
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****************************************************************************/
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static void serial_out(struct term_pair_s *tp)
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{
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#ifdef CONFIG_EXAMPLES_PTYTEST_POLL
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struct pollfd fdp;
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#endif
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char buffer[16];
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int ret;
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if (!tp)
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{
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fprintf(stderr, "Error: terminal pair struct is NULL!\n");
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return;
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}
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#ifdef CONFIG_EXAMPLES_PTYTEST_POLL
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fdp.fd = tp->fd_pty;
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fdp.events = POLLIN;
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#endif
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/* Run forever */
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for (;;)
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{
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#ifdef CONFIG_EXAMPLES_PTYTEST_POLL
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ret = poll((struct pollfd *)&fdp, 1, POLL_TIMEOUT);
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if (ret > 0)
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{
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if ((fdp.revents & POLLIN) != 0)
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#endif
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{
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ssize_t len;
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len = read(tp->fd_pty, buffer, 16);
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if (len < 0)
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{
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fprintf(stderr,
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"ERROR: Failed to read from pseudo-terminal: %d\n",
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errno);
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}
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else if (len > 0)
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{
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ret = write(tp->fd_uart, buffer, len);
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if (ret < 0)
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{
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fprintf(stderr,
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"ERROR: Failed to write to serial: %d\n",
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errno);
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}
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}
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}
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#ifdef CONFIG_EXAMPLES_PTYTEST_POLL
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}
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/* Timeout */
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else if (ret == 0)
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{
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continue;
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}
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/* poll error */
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else if (ret < 0)
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{
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fprintf(stderr, "ERROR: poll failed: %d\n", errno);
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continue;
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}
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#endif
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}
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pty_test_main
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****************************************************************************/
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int main(int argc, FAR char *argv[])
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{
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struct term_pair_s termpair;
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struct termios tio;
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pthread_t si_thread;
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pthread_t so_thread;
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char buffer[16];
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pid_t pid;
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int fd_pts;
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int ret;
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printf("Create pseudo-terminal\n");
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/* Open pseudo-terminal master (pts factory) */
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termpair.fd_pty = open("/dev/ptmx", O_RDWR | O_NOCTTY);
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if (termpair.fd_pty < 0)
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{
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fprintf(stderr, "ERROR: Failed to opening /dev/ptmx: %d\n",
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errno);
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return EXIT_FAILURE;
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}
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/* Grant access and unlock the slave PTY */
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ret = grantpt(termpair.fd_pty);
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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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goto error_pts;
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}
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ret = unlockpt(termpair.fd_pty);
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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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goto error_pts;
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}
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/* Get the create pts file-name */
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ret = ptsname_r(termpair.fd_pty, buffer, 16);
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if (ret < 0)
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{
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fprintf(stderr, "ERROR: ptsname_r() failed: %d\n", errno);
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goto error_pts;
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}
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/* Open the created pts */
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fd_pts = open(buffer, O_RDWR | O_NONBLOCK);
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if (fd_pts < 0)
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{
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fprintf(stderr, "ERROR: Failed to open %s: %d\n", buffer, errno);
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goto error_pts;
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}
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/* Open the second serial port to create a new console there */
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termpair.fd_uart = open(CONFIG_EXAMPLES_PTYTEST_SERIALDEV,
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O_RDWR | O_NONBLOCK);
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if (termpair.fd_uart < 0)
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{
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fprintf(stderr, "Failed to open %s: %\n",
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CONFIG_EXAMPLES_PTYTEST_SERIALDEV, errno);
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goto error_serial;
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}
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#ifdef CONFIG_SERIAL_TERMIOS
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/* Enable \n -> \r\n conversion during write */
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ret = tcgetattr(termpair.fd_uart, &tio);
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if (ret)
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{
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fprintf(stderr, "ERROR: tcgetattr() failed: %d\n", errno);
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goto error_serial;
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}
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tio.c_oflag = OPOST | ONLCR;
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ret = tcsetattr(termpair.fd_uart, TCSANOW, &tio);
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if (ret)
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{
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fprintf(stderr, "ERROR: tcsetattr() failed: %d\n", errno);
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goto error_serial;
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}
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#endif
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printf("Starting a new NSH Session using %s\n", buffer);
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/* Close default stdin, stdout and stderr */
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close(0);
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close(1);
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close(2);
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/* Use this pts file as stdin, stdout, and stderr */
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(void)dup2(fd_pts, 0);
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(void)dup2(fd_pts, 1);
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(void)dup2(fd_pts, 2);
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/* Create a new console using this /dev/pts/N */
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pid = task_create("NSH Console", CONFIG_EXAMPLES_PTYTEST_DAEMONPRIO,
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CONFIG_EXAMPLES_PTYTEST_STACKSIZE, nsh_consolemain, NULL);
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if (pid < 0)
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{
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/* Can't do output because stdout and stderr are redirected */
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goto error_console;
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}
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/* Start a thread to read from serial */
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ret = pthread_create(&si_thread, NULL,
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(pthread_startroutine_t)serial_in,
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(pthread_addr_t)&termpair);
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if (ret != 0)
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{
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/* Can't do output because stdout and stderr are redirected */
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goto error_thread1;
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}
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/* Start a thread to write to serial */
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ret = pthread_create(&so_thread, NULL,
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(pthread_startroutine_t)serial_out,
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(pthread_addr_t)&termpair);
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if (ret != 0)
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{
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/* Can't do output because stdout and stderr are redirected */
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goto error_thread2;
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}
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/* Stay here to keep the threads running */
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for (;;)
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{
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/* Nothing to do, then sleep to avoid eating all cpu time */
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usleep(10000);
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}
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return EXIT_SUCCESS;
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error_thread2:
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error_thread1:
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error_console:
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close(termpair.fd_uart);
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error_serial:
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close(fd_pts);
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error_pts:
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close(termpair.fd_pty);
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return EXIT_FAILURE;
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}
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