3a6
#include <stdio.h>
#include <curses.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>


/* TIOCM_CAR, TIOCM_RTS, TIOCM_DTR, TIOCM_RNG, TIOCM_DSR, TIOCM_CTS */


main()
{
    unsigned int modem_info;
    int fd;
    char tmp[80];

    initscr();
    noecho();
    keypad(stdscr, TRUE);
    nodelay(stdscr, TRUE);
	
    fd = open("/dev/ttyS3", O_RDWR | O_NONBLOCK);
    if (fd == -1) {
	addstr("Error opening serial port\n");
	refresh();
	endwin();
	exit(1);
    }

    while (1) {
	move(1, 1);
	if (ioctl(fd, TIOCMGET, &modem_info) == -1)
	    sprintf(tmp, "IOCTL error");
	else
	    sprintf(tmp, "CD: %d  DSR: %d  CTS: %d",
		    (modem_info & TIOCM_CD) >> 6,
		    (modem_info & TIOCM_DSR) >> 8,
		    (modem_info & TIOCM_CTS) >> 5);
	addstr(tmp);
	refresh();
	if(getch() != ERR)
	    break;
    }

    close(fd);
    endwin();
    exit(0);
}
.

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