/* * rpc_serial.c * ------------ * Remote procedure call transport over serial line with SLIP framing. * * Copyright (c) 2016, NORDUnet A/S All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * - Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * - 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. * * - Neither the name of the NORDUnet 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 * HOLDER 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. */ #include #include #include #include #include #include #include #include #include "hal.h" #include "hal_internal.h" #include "slip_internal.h" /* * Not thrilled about having OS-specific conditionals, but as such things * go, this seems relatively safe: gcc and clang both define it on Mac OS X, * and anything *not* on Mac OS X which defines it is begging for trouble. */ #ifndef HAL_RPC_SERIAL_USE_MACOSX_IOCTL #define HAL_RPC_SERIAL_USE_MACOSX_IOCTL (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__)) #endif #if HAL_RPC_SERIAL_USE_MACOSX_IOCTL #include #include #endif static int fd = -1; hal_error_t hal_serial_init(const char * const device, const uint32_t speed) { struct termios tty; speed_t termios_speed; /* * Apparently Linux is too cool to need an atomic mechanism for * locking an existing file, so we can't uses O_EXLOCK. Sigh. */ fd = open(device, O_RDWR | O_NOCTTY | O_SYNC); if (fd == -1) return perror(device), HAL_ERROR_RPC_TRANSPORT; if (flock(fd, LOCK_EX) < 0) return perror(device), HAL_ERROR_RPC_TRANSPORT; if (tcgetattr (fd, &tty) != 0) return perror("tcgetattr"), HAL_ERROR_RPC_TRANSPORT; #if !HAL_RPC_SERIAL_USE_MACOSX_IOCTL switch (speed) { case 115200: termios_speed = B115200; break; case 921600: termios_speed = B921600; break; default: fprintf(stderr, "invalid line speed %lu\n", (unsigned long) speed); return HAL_ERROR_RPC_TRANSPORT; } cfsetospeed (&tty, termios_speed); cfsetispeed (&tty, termios_speed); #endif tty.c_cflag &= ~CSIZE; tty.c_cflag |= (CS8 | CLOCAL | CREAD); tty.c_iflag = 0; tty.c_oflag = 0; tty.c_lflag = 0; tty.c_cc[VMIN] = 1; tty.c_cc[VTIME] = 0; if (tcsetattr (fd, TCSANOW, &tty) != 0) return perror("tcsetattr"), HAL_ERROR_RPC_TRANSPORT; #if HAL_RPC_SERIAL_USE_MACOSX_IOCTL termios_speed = speed; if (ioctl(fd, IOSSIOSPEED, &speed) < 0) return perror("ioctl(IOSSIOSPEED)"), HAL_ERROR_RPC_TRANSPORT; #endif return HAL_OK; } hal_error_t hal_serial_close(void) { int ret = close(fd); fd = -1; if (ret != 0) return perror("close"), HAL_ERROR_RPC_TRANSPORT; return HAL_OK; } hal_error_t hal_serial_send_char(const uint8_t c) { if (write(fd, &c, 1) != 1) return perror("write"), HAL_ERROR_RPC_TRANSPORT; return HAL_OK; } hal_error_t hal_serial_recv_char(uint8_t * const c) { if (read(fd, c, 1) != 1) return perror("read"), HAL_ERROR_RPC_TRANSPORT; return HAL_OK; } /* Access routine for the file descriptor, so daemon can poll on it. */ int hal_serial_get_fd(void) { return fd; } 3bbd3dbccef8c499e980490203cd5085dd13a98'>b3bbd3d 
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