mspdebug/util.c

/* MSPDebug - debugging tool for MSP430 MCUs
 * Copyright (C) 2009, 2010 Daniel Beer
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <assert.h>

#include "util.h"

static volatile int ctrlc_flag;

static void sigint_handler(int signum)
{
	ctrlc_flag = 1;
}

void ctrlc_init(void)
{
	const static struct sigaction siga = {
		.sa_handler = sigint_handler,
		.sa_flags = 0
	};

	sigaction(SIGINT, &siga, NULL);
}

void ctrlc_reset(void)
{
	ctrlc_flag = 0;
}

int ctrlc_check(void)
{
	return ctrlc_flag;
}

int read_with_timeout(int fd, u_int8_t *data, int max_len)
{
	int r;

	do {
		struct timeval tv = {
			.tv_sec = 5,
			.tv_usec = 0
		};

		fd_set set;

		FD_ZERO(&set);
		FD_SET(fd, &set);

		r = select(fd + 1, &set, NULL, NULL, &tv);
		if (r > 0)
			r = read(fd, data, max_len);

		if (!r)
			errno = ETIMEDOUT;
		if (r <= 0 && errno != EINTR)
			return -1;
	} while (r <= 0);

	return r;
}

int write_all(int fd, const u_int8_t *data, int len)
{
	while (len) {
		int result = write(fd, data, len);

		if (result < 0) {
			if (errno == EINTR)
				continue;
			return -1;
		}

		data += result;
		len -= result;
	}

	return 0;
}

int open_serial(const char *device, int rate)
{
	int fd = open(device, O_RDWR | O_NOCTTY);
	struct termios attr;

	tcgetattr(fd, &attr);
	cfmakeraw(&attr);
	cfsetspeed(&attr, rate);

	if (tcsetattr(fd, TCSAFLUSH, &attr) < 0)
		return -1;

	return fd;
}