HOW TO get TTY id from a c programm

dinob · 05-23-2009, 09:55 AM

Hi experts,

I am new to linux/c programming and I am trying to get TTY id from my c program. Something like this:

int TTYID = get_ttyid();

How do I do that?

Regards,
_dino_

harry edwards · 05-23-2009, 02:10 PM

See man ttyname. Sample follows:

Code:

#include <stdio.h>
#include <sys/types.h>


static const char tty_usage[] = "tty\n"
#ifndef BB_FEATURE_TRIVIAL_HELP
	"\nPrint the file name of the terminal connected to standard input.\n\n"
	"Options:\n"
	"\t-s\tprint nothing, only return an exit status\n"
#endif
	;

extern int tty_main(int argc, char **argv)
{
	char *tty;

	if (argc > 1) {
		if (argv[1][0] != '-' || argv[1][1] != 's')
			usage(tty_usage);
	} else {
		tty = ttyname(0);
		if (tty)
			puts(tty);
		else
			puts("not a tty");
	}
	return(isatty(0) ? TRUE : FALSE);
}