279 lines
7.6 KiB
C
279 lines
7.6 KiB
C
/*
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* Copyright (c) 2016, The OpenThread Authors.
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* All rights reserved.
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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 are met:
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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 the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN 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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#include <assert.h>
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#include <fcntl.h>
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#include <poll.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <termios.h>
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#include <unistd.h>
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#include <errno.h>
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#include <signal.h>
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#include <common/code_utils.hpp>
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#include <platform/uart.h>
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#include "platform-posix.h"
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#ifdef OPENTHREAD_TARGET_LINUX
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#include <sys/prctl.h>
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int posix_openpt(int oflag);
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int grantpt(int fildes);
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int unlockpt(int fd);
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char *ptsname(int fd);
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#endif // OPENTHREAD_TARGET_LINUX
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static uint8_t s_receive_buffer[128];
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static const uint8_t *s_write_buffer;
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static uint16_t s_write_length;
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static int s_in_fd;
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static int s_out_fd;
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static struct termios original_stdin_termios;
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static struct termios original_stdout_termios;
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static void restore_stdin_termios(void)
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{
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tcsetattr(s_in_fd, TCSAFLUSH, &original_stdin_termios);
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}
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static void restore_stdout_termios(void)
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{
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tcsetattr(s_out_fd, TCSAFLUSH, &original_stdout_termios);
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}
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ThreadError otPlatUartEnable(void)
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{
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ThreadError error = kThreadError_None;
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struct termios termios;
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#ifdef OPENTHREAD_TARGET_LINUX
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// Ensure we terminate this process if the
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// parent process dies.
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prctl(PR_SET_PDEATHSIG, SIGHUP);
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#endif
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s_in_fd = dup(STDIN_FILENO);
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s_out_fd = dup(STDOUT_FILENO);
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dup2(STDERR_FILENO, STDOUT_FILENO);
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// We need this signal to make sure that this
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// process terminates properly.
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signal(SIGPIPE, SIG_DFL);
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if (isatty(s_in_fd))
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{
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tcgetattr(s_in_fd, &original_stdin_termios);
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atexit(&restore_stdin_termios);
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}
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if (isatty(s_out_fd))
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{
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tcgetattr(s_out_fd, &original_stdout_termios);
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atexit(&restore_stdout_termios);
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}
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if (isatty(s_in_fd))
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{
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// get current configuration
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VerifyOrExit(tcgetattr(s_in_fd, &termios) == 0, perror("tcgetattr"); error = kThreadError_Error);
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// Set up the termios settings for raw mode. This turns
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// off input/output processing, line processing, and character processing.
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cfmakeraw(&termios);
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// Set up our cflags for local use. Turn on hangup-on-close.
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termios.c_cflag |= HUPCL | CREAD | CLOCAL;
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// "Minimum number of characters for noncanonical read"
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termios.c_cc[VMIN] = 1;
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// "Timeout in deciseconds for noncanonical read"
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termios.c_cc[VTIME] = 0;
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// configure baud rate
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VerifyOrExit(cfsetispeed(&termios, B115200) == 0, perror("cfsetispeed"); error = kThreadError_Error);
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// set configuration
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VerifyOrExit(tcsetattr(s_in_fd, TCSANOW, &termios) == 0, perror("tcsetattr"); error = kThreadError_Error);
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}
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if (isatty(s_out_fd))
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{
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// get current configuration
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VerifyOrExit(tcgetattr(s_out_fd, &termios) == 0, perror("tcgetattr"); error = kThreadError_Error);
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// Set up the termios settings for raw mode. This turns
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// off input/output processing, line processing, and character processing.
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cfmakeraw(&termios);
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// Absolutely obliterate all output processing.
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termios.c_oflag = 0;
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// Set up our cflags for local use. Turn on hangup-on-close.
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termios.c_cflag |= HUPCL | CREAD | CLOCAL;
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// configure baud rate
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VerifyOrExit(cfsetospeed(&termios, B115200) == 0, perror("cfsetospeed"); error = kThreadError_Error);
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// set configuration
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VerifyOrExit(tcsetattr(s_out_fd, TCSANOW, &termios) == 0, perror("tcsetattr"); error = kThreadError_Error);
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}
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return error;
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exit:
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close(s_in_fd);
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close(s_out_fd);
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return error;
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}
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ThreadError otPlatUartDisable(void)
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{
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ThreadError error = kThreadError_None;
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close(s_in_fd);
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close(s_out_fd);
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return error;
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}
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ThreadError otPlatUartSend(const uint8_t *aBuf, uint16_t aBufLength)
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{
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ThreadError error = kThreadError_None;
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VerifyOrExit(s_write_length == 0, error = kThreadError_Busy);
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s_write_buffer = aBuf;
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s_write_length = aBufLength;
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exit:
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return error;
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}
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void posixUartUpdateFdSet(fd_set *aReadFdSet, fd_set *aWriteFdSet, fd_set *aErrorFdSet, int *aMaxFd)
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{
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if (aReadFdSet != NULL)
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{
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FD_SET(s_in_fd, aReadFdSet);
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if (aErrorFdSet != NULL)
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{
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FD_SET(s_in_fd, aErrorFdSet);
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}
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if (aMaxFd != NULL && *aMaxFd < s_in_fd)
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{
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*aMaxFd = s_in_fd;
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}
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}
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if ((aWriteFdSet != NULL) && (s_write_length > 0))
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{
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FD_SET(s_out_fd, aWriteFdSet);
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if (aErrorFdSet != NULL)
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{
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FD_SET(s_out_fd, aErrorFdSet);
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}
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if (aMaxFd != NULL && *aMaxFd < s_out_fd)
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{
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*aMaxFd = s_out_fd;
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}
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}
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}
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void posixUartProcess(void)
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{
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ssize_t rval;
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const int error_flags = POLLERR | POLLNVAL | POLLHUP;
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struct pollfd pollfd[] =
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{
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{ s_in_fd, POLLIN | error_flags, 0 },
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{ s_out_fd, POLLOUT | error_flags, 0 },
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};
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errno = 0;
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rval = poll(pollfd, sizeof(pollfd) / sizeof(*pollfd), 0);
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if (rval < 0)
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{
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perror("poll");
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exit(EXIT_FAILURE);
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}
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if (rval > 0)
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{
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if ((pollfd[0].revents & error_flags) != 0)
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{
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perror("s_in_fd");
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exit(EXIT_FAILURE);
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}
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if ((pollfd[1].revents & error_flags) != 0)
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{
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perror("s_out_fd");
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exit(EXIT_FAILURE);
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}
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if (pollfd[0].revents & POLLIN)
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{
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rval = read(s_in_fd, s_receive_buffer, sizeof(s_receive_buffer));
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if (rval <= 0)
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{
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perror("read");
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exit(EXIT_FAILURE);
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}
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otPlatUartReceived(s_receive_buffer, (uint16_t)rval);
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}
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if ((s_write_length > 0) && (pollfd[1].revents & POLLOUT))
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{
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rval = write(s_out_fd, s_write_buffer, s_write_length);
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if (rval <= 0)
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{
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perror("write");
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exit(EXIT_FAILURE);
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}
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s_write_buffer += (uint16_t)rval;
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s_write_length -= (uint16_t)rval;
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if (s_write_length == 0)
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{
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otPlatUartSendDone();
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}
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}
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}
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}
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