/****************************************************************************
* apps/examples/pty_test/pty_test.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <termios.h>
#include <poll.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <nuttx/serial/pty.h>
#include "nshlib/nshlib.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifndef CONFIG_EXAMPLES_PTYTEST_SERIALDEV
# define CONFIG_EXAMPLES_PTYTEST_SERIALDEV "/dev/ttyS1"
#endif
#ifndef CONFIG_EXAMPLES_PTYTEST_DAEMONPRIO
# define CONFIG_EXAMPLES_PTYTEST_DAEMONPRIO SCHED_PRIORITY_DEFAULT
#endif
#ifndef CONFIG_EXAMPLES_PTYTEST_STACKSIZE
# define CONFIG_EXAMPLES_PTYTEST_STACKSIZE 2048
#endif
#define POLL_TIMEOUT 200
/****************************************************************************
* Private Data
****************************************************************************/
struct term_pair_s
{
int fd_uart;
int fd_pty;
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: serial_in
*
* Description:
* Read data from serial and write to pts
*
****************************************************************************/
static void serial_in(struct term_pair_s *tp)
{
#ifdef CONFIG_EXAMPLES_PTYTEST_POLL
struct pollfd fdp;
#endif
char buffer[16];
int ret;
if (!tp)
{
fprintf(stderr, "ERROR: terminal pair struct is NULL!\n");
return;
}
#ifdef CONFIG_EXAMPLES_PTYTEST_POLL
fdp.fd = tp->fd_uart;
fdp.events = POLLIN;
#endif
/* Run forever */
while (true)
{
#ifdef CONFIG_EXAMPLES_PTYTEST_POLL
ret = poll((struct pollfd *)&fdp, 1, POLL_TIMEOUT);
if (ret > 0)
{
if ((fdp.revents & POLLIN) != 0)
#endif
{
ssize_t len;
len = read(tp->fd_uart, buffer, 16);
if (len < 0)
{
fprintf(stderr,
"ERROR Failed to read from serial: %d\n",
errno);
}
else if (len > 0)
{
ret = write(tp->fd_pty, buffer, len);
if (ret < 0)
{
fprintf(stderr,
"Failed to write to serial: %d\n",
errno);
}
}
}
#ifdef CONFIG_EXAMPLES_PTYTEST_POLL
}
/* Timeout */
else if (ret == 0)
{
continue;
}
/* Poll error */
else if (ret < 0)
{
fprintf(stderr, "ERROR: poll failed: %d\n", errno);
continue;
}
#endif
}
}
/****************************************************************************
* Name: serial_out
*
* Description:
* Read data from pts and write to serial
*
****************************************************************************/
static void serial_out(struct term_pair_s *tp)
{
#ifdef CONFIG_EXAMPLES_PTYTEST_POLL
struct pollfd fdp;
#endif
char buffer[16];
int ret;
if (!tp)
{
fprintf(stderr, "Error: terminal pair struct is NULL!\n");
return;
}
#ifdef CONFIG_EXAMPLES_PTYTEST_POLL
fdp.fd = tp->fd_pty;
fdp.events = POLLIN;
#endif
/* Run forever */
while (true)
{
#ifdef CONFIG_EXAMPLES_PTYTEST_POLL
ret = poll((struct pollfd *)&fdp, 1, POLL_TIMEOUT);
if (ret > 0)
{
if ((fdp.revents & POLLIN) != 0)
#endif
{
ssize_t len;
len = read(tp->fd_pty, buffer, 16);
if (len < 0)
{
fprintf(stderr,
"ERROR: Failed to read from pseudo-terminal: %d\n",
errno);
}
else if (len > 0)
{
ret = write(tp->fd_uart, buffer, len);
if (ret < 0)
{
fprintf(stderr,
"ERROR: Failed to write to serial: %d\n",
errno);
}
}
}
#ifdef CONFIG_EXAMPLES_PTYTEST_POLL
}
/* Timeout */
else if (ret == 0)
{
continue;
}
/* poll error */
else if (ret < 0)
{
fprintf(stderr, "ERROR: poll failed: %d\n", errno);
continue;
}
#endif
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: pty_test_main
****************************************************************************/
int main(int argc, FAR char *argv[])
{
struct term_pair_s termpair;
struct termios tio;
pthread_t si_thread;
pthread_t so_thread;
char buffer[16];
pid_t pid;
int fd_pts;
int ret;
printf("Create pseudo-terminal\n");
/* Open pseudo-terminal master (pts factory) */
termpair.fd_pty = open("/dev/ptmx", O_RDWR | O_NOCTTY);
if (termpair.fd_pty < 0)
{
fprintf(stderr, "ERROR: Failed to opening /dev/ptmx: %d\n",
errno);
return EXIT_FAILURE;
}
/* Grant access and unlock the slave PTY */
ret = grantpt(termpair.fd_pty);
if (ret < 0)
{
fprintf(stderr, "ERROR: grantpt() failed: %d\n", errno);
goto error_pts;
}
ret = unlockpt(termpair.fd_pty);
if (ret < 0)
{
fprintf(stderr, "ERROR: unlockpt() failed: %d\n", errno);
goto error_pts;
}
/* Get the create pts file-name */
ret = ptsname_r(termpair.fd_pty, buffer, 16);
if (ret < 0)
{
fprintf(stderr, "ERROR: ptsname_r() failed: %d\n", errno);
goto error_pts;
}
/* Open the created pts */
fd_pts = open(buffer, O_RDWR);
if (fd_pts < 0)
{
fprintf(stderr, "ERROR: Failed to open %s: %d\n", buffer, errno);
goto error_pts;
}
/* Open the second serial port to create a new console there */
termpair.fd_uart = open(CONFIG_EXAMPLES_PTYTEST_SERIALDEV, O_RDWR);
if (termpair.fd_uart < 0)
{
#ifdef CONFIG_EXAMPLES_PTYTEST_WAIT_CONNECTED
/* if ENOTCONN is received, re-attempt to open periodically */
if (errno == ENOTCONN)
{
fprintf(stderr, "ERROR: device not connected, will continue"
" trying\n");
}
while (termpair.fd_uart < 0 && errno == ENOTCONN)
{
sleep(1);
termpair.fd_uart = open(CONFIG_EXAMPLES_PTYTEST_SERIALDEV, O_RDWR);
}
/* if we exited due to an error different than ENOTCONN */
if (termpair.fd_uart < 0)
{
fprintf(stderr, "Failed to open %s: %i\n",
CONFIG_EXAMPLES_PTYTEST_SERIALDEV, errno);
goto error_serial;
}
#else
fprintf(stderr, "Failed to open %s: %i\n",
CONFIG_EXAMPLES_PTYTEST_SERIALDEV, errno);
goto error_serial;
#endif
}
#ifdef CONFIG_SERIAL_TERMIOS
/* Enable \n -> \r\n conversion during write */
ret = tcgetattr(termpair.fd_uart, &tio);
if (ret)
{
fprintf(stderr, "ERROR: tcgetattr() failed: %d\n", errno);
goto error_serial;
}
tio.c_oflag = OPOST | ONLCR;
ret = tcsetattr(termpair.fd_uart, TCSANOW, &tio);
if (ret)
{
fprintf(stderr, "ERROR: tcsetattr() failed: %d\n", errno);
goto error_serial;
}
#endif
printf("Starting a new NSH Session using %s\n", buffer);
/* Close default stdin, stdout and stderr */
close(0);
close(1);
close(2);
/* Use this pts file as stdin, stdout, and stderr */
dup2(fd_pts, 0);
dup2(fd_pts, 1);
dup2(fd_pts, 2);
/* Create a new console using this /dev/pts/N */
pid = task_create("NSH Console", CONFIG_EXAMPLES_PTYTEST_DAEMONPRIO,
CONFIG_EXAMPLES_PTYTEST_STACKSIZE, nsh_consolemain,
&argv[1]);
if (pid < 0)
{
/* Can't do output because stdout and stderr are redirected */
goto error_console;
}
/* Start a thread to read from serial */
ret = pthread_create(&si_thread, NULL,
(pthread_startroutine_t)serial_in,
(pthread_addr_t)&termpair);
if (ret != 0)
{
/* Can't do output because stdout and stderr are redirected */
goto error_thread1;
}
/* Start a thread to write to serial */
ret = pthread_create(&so_thread, NULL,
(pthread_startroutine_t)serial_out,
(pthread_addr_t)&termpair);
if (ret != 0)
{
/* Can't do output because stdout and stderr are redirected */
goto error_thread2;
}
/* Stay here to keep the threads running */
while (true)
{
/* Nothing to do, then sleep to avoid eating all cpu time */
pause();
}
return EXIT_SUCCESS;
error_thread2:
error_thread1:
error_console:
close(termpair.fd_uart);
error_serial:
close(fd_pts);
error_pts:
close(termpair.fd_pty);
return EXIT_FAILURE;
}