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/******************************************************************
** File: serial.c
** Description: the serial part for microcom project
**
** Copyright (C)1999 Anca and Lucian Jurubita <ljurubita@hotmail.com>.
** All rights reserved.
****************************************************************************
** 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 at www.gnu.org
****************************************************************************
** Rev. 1.0 - Feb. 2000
** Rev. 1.01 - March 2000
** Rev. 1.02 - June 2000
****************************************************************************/
#include <limits.h>
#include <arpa/telnet.h>
#include "microcom.h"
static struct termios pots; /* old port termios settings to restore */
static char *lockfile;
static void init_comm(struct termios *pts)
{
/* some things we want to set arbitrarily */
pts->c_lflag &= ~ICANON;
pts->c_lflag &= ~(ECHO | ECHOCTL | ECHONL);
pts->c_cflag |= HUPCL;
pts->c_iflag |= IGNBRK;
pts->c_cc[VMIN] = 1;
pts->c_cc[VTIME] = 0;
/* Standard CR/LF handling: this is a dumb terminal.
* Do no translation:
* no NL -> CR/NL mapping on output, and
* no CR -> NL mapping on input.
*/
pts->c_oflag &= ~ONLCR;
pts->c_iflag &= ~ICRNL;
}
static int serial_set_speed(struct ios_ops *ios, speed_t speed)
{
struct termios pts; /* termios settings on port */
tcgetattr(ios->fd, &pts);
cfsetospeed(&pts, speed);
cfsetispeed(&pts, speed);
tcsetattr(ios->fd, TCSANOW, &pts);
return 0;
}
static int serial_set_flow(struct ios_ops *ios, int flow)
{
struct termios pts; /* termios settings on port */
tcgetattr(ios->fd, &pts);
switch (flow) {
case FLOW_NONE:
/* no flow control */
pts.c_cflag &= ~CRTSCTS;
pts.c_iflag &= ~(IXON | IXOFF | IXANY);
break;
case FLOW_HARD:
/* hardware flow control */
pts.c_cflag |= CRTSCTS;
pts.c_iflag &= ~(IXON | IXOFF | IXANY);
break;
case FLOW_SOFT:
/* software flow control */
pts.c_cflag &= ~CRTSCTS;
pts.c_iflag |= IXON | IXOFF | IXANY;
break;
}
tcsetattr(ios->fd, TCSANOW, &pts);
return 0;
}
static int serial_send_break(struct ios_ops *ios)
{
tcsendbreak(ios->fd, 0);
return 0;
}
/* unlink the lockfile */
static void serial_unlock()
{
if (lockfile)
unlink(lockfile);
}
/* restore original terminal settings on exit */
static void serial_exit(struct ios_ops *ios)
{
tcsetattr(ios->fd, TCSANOW, &pots);
close(ios->fd);
free(ios);
serial_unlock();
}
struct ios_ops * serial_init(char *device)
{
struct termios pts; /* termios settings on port */
struct ios_ops *ops;
int fd;
char *substring;
long pid;
ops = malloc(sizeof(*ops));
if (!ops)
return NULL;
lockfile = malloc(PATH_MAX);
if (!lockfile)
return NULL;
ops->set_speed = serial_set_speed;
ops->set_flow = serial_set_flow;
ops->send_break = serial_send_break;
ops->exit = serial_exit;
/* check lockfile */
substring = strrchr(device, '/');
if (substring)
substring++;
else
substring = device;
sprintf(lockfile, "/var/lock/LCK..%s", substring);
fd = open(lockfile, O_RDONLY);
if (fd >= 0 && !opt_force) {
close(fd);
main_usage(3, "lockfile for port exists", device);
}
if (fd >= 0 && opt_force) {
close(fd);
printf("lockfile for port exists, ignoring\n");
serial_unlock();
}
fd = open(lockfile, O_RDWR | O_CREAT, 0444);
if (fd < 0 && opt_force) {
printf("cannot create lockfile. ignoring\n");
lockfile = NULL;
goto force;
}
if (fd < 0)
main_usage(3, "cannot create lockfile", device);
/* Kermit wants binary pid */
pid = getpid();
write(fd, &pid, sizeof(long));
close(fd);
force:
/* open the device */
fd = open(device, O_RDWR);
ops->fd = fd;
if (fd < 0) {
serial_unlock();
main_usage(2, "cannot open device", device);
}
/* modify the port configuration */
tcgetattr(fd, &pts);
memcpy(&pots, &pts, sizeof (pots));
init_comm(&pts);
tcsetattr(fd, TCSANOW, &pts);
printf("connected to %s\n", device);
return ops;
}
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