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/* uartcount: (linux) display the modem input interrupt counters */
#include <stdio.h>
#include <termios.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <linux/serial.h>
int main(int argc, char **argv)
{
int fd;
struct serial_icounter_struct c;
if ((fd = open(argc == 2 ? argv[1] : "/dev/modem",
O_RDONLY | O_NONBLOCK | O_NOCTTY)) < 0) {
perror("cannot open modem device");
exit(1);
}
while (1) {
if (ioctl(fd, TIOCGICOUNT, &c) != 0)
exit(1);
printf("Count: RI=%6d # CD=%6d # CTS=%6d # DSR=%6d\n",
c.rng, c.dcd, c.cts, c.dsr);
ioctl(fd, TIOCMIWAIT, TIOCM_RNG | TIOCM_CTS | TIOCM_DSR | TIOCM_CD);
}
}
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