sbase/tty.c

31 lines
373 B
C

/* See LICENSE file for copyright and license details. */
#include <stdio.h>
#include <unistd.h>
#include "util.h"
static void
usage(void)
{
eprintf("usage: %s\n", argv0);
}
int
main(int argc, char *argv[])
{
char *tty;
ARGBEGIN {
default:
usage();
} ARGEND;
if (argc)
usage();
tty = ttyname(STDIN_FILENO);
puts(tty ? tty : "not a tty");
return !tty;
}