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/*
* statserial - Serial Port Status Utility
*
* Copyright (C) 1994 Jeff Tranter (Jeff_Tranter@Mitel.COM)
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
********************************************************************
*
* See the man page for a description of what this program does and what
* the requirements to run it are.
*
* It was developed using:
* - Linux kernel 1.1.73
* - gcc 2.5.8
* - no-name serial card (16450), FIFO card (16550)
*
* Jeff Tranter (Jeff_Tranter@Mitel.COM)
* Frank Baumgart (godot@uni-paderborn.de)
*/
#include <curses.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>
#include <string.h>
#include <sys/ioctl.h>
/* global variables */
char device[255]; /* name of device to open */
const char *defaultDevice = "/dev/ttyS1"; /* default device if none specified on command line */
int n_option = 0; /* set if -n option is used */
int d_option = 0; /* set if -d option is used */
int x_option = 0; /* set if -x option is used */
/* print command usage and exit */
void usage()
{
fprintf(stderr, "usage: statserial [-n | -d | -x] [device]\n");
fprintf(stderr, " -n option disables looping\n");
fprintf(stderr, " -d option prints modem status as a decimal number\n");
fprintf(stderr, " -x option prints modem status as a hexadecimal number\n");
fprintf(stderr, " Default device is %s\n", device);
exit(1);
}
/* handle command line options */
void parse_args(int argc, char **argv)
{
const char *flags = "ndx";
int c;
while ((c = getopt(argc, argv, flags)) != EOF) {
switch (c) {
case 'n':
n_option = 1;
break;
case 'd':
d_option = 1;
break;
case 'x':
x_option = 1;
break;
case '?':
usage();
break;
}
}
if (n_option + d_option + x_option > 1) {
printf("statserial: options are mutually exclusive\n");
usage();
}
/* check for a single additional argument */
if ((argc - optind) > 1)
usage(); /* too many arguments */
if ((argc - optind) == 1)
strcpy(device, argv[optind]); /* one argument */
}
/* called before exiting */
void cleanup()
{
endwin(); /* required by curses */
}
/* main program */
int main(int argc, char *argv[])
{
int fd; /* for serial device */
int status; /* status of system calls */
unsigned int old_status = 0; /* value of previous call */
unsigned int arg; /* value returned by ioctl */
/* make default the default, use $MODEM if set */
if (getenv("MODEM"))
strcpy(device, getenv("MODEM"));
else
strcpy(device, defaultDevice);
/* parse command line arguments */
parse_args(argc, argv);
/* open port */
fd = open(device, O_RDONLY | O_NONBLOCK | O_NOCTTY);
if (fd == -1) {
char s[255];
sprintf(s, "statserial: can't open device `%s'", device);
perror(s);
exit(1);
}
/* init curses */
if (!d_option && !x_option) {
initscr();
atexit(cleanup);
}
/* loop forever */
for (;;) {
/* get modem status info */
status = ioctl(fd, TIOCMGET, &arg);
if (status != 0) {
perror("statserial: TIOCMGET failed");
exit(1);
}
/* avoid unneccessary screen updates */
if (arg == old_status)
{
sleep(1);
continue;
}
old_status = arg;
/* home cursor */
if (!d_option && !x_option) {
move(0,0);
}
/* print status in decimal */
if (d_option) {
printf("%d\n", arg);
exit(0);
}
/* print status in hex */
if (x_option) {
printf("%x\n", arg);
exit(0);
}
printw("Device: %s\n\n", device);
printw("Signal Pin Pin Direction Status Full\n");
printw("Name (25) (9) (computer) Name\n");
printw("----- --- --- --------- ------ -----\n");
printw("FG 1 - - - Frame Ground\n");
printw("TxD 2 3 out - Transmit Data\n");
printw("RxD 3 2 in - Receive Data\n");
printw("RTS 4 7 out %1d Request To Send\n", !!(arg & TIOCM_RTS));
printw("CTS 5 8 in %1d Clear To Send\n", !!(arg & TIOCM_CTS));
printw("DSR 6 6 in %1d Data Set Ready\n", !!(arg & TIOCM_DSR));
printw("GND 7 5 - - Signal Ground\n");
printw("DCD 8 1 in %1d Data Carrier Detect\n", !!(arg & TIOCM_CAR));
printw("DTR 20 4 out %1d Data Terminal Ready\n", !!(arg & TIOCM_DTR));
printw("RI 22 9 in %1d Ring Indicator\n", !!(arg & TIOCM_RNG));
refresh();
/* break out if -n option was used */
if (n_option)
exit(0);
/* delay 1 second between loops */
sleep(1);
}
return 0;
}
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