The HyperNews Linux KHG Discussion Pages


Forum: The Linux Kernel Hackers' Guide
Re: Question Modem bits (Franky)
Date: Sat, 31 Jan 1998 18:57:59 GMT
From: Kostya <>

It's quite simple. I think the code will explain it the best.


#include <termios.h>

int status ;

ioctl (fd,TIOCMGET,&status) ; // fd - already opened device.
if (status & TIOCM_DTR)
       printf ("DTR is asserted\n"); // for example


Info about '#defines' for modem signals in /usr/src/linux/include/asm/termios.h

Best regards.