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/*
* 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 <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <netinet/in.h>
#include <termios.h>
#include <unistd.h>
#include <fcntl.h>
#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 <IOKit/serial/ioss.h>
#include <sys/ioctl.h>
#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;
}
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