1 /* tty.c - Show stdin's terminal name
2  *
3  * Copyright 2011 Rob Landley <rob@landley.net>
4  *
5  * See http://opengroup.org/onlinepubs/9699919799/utilities/tty.html
6 
7 USE_TTY(NEWTOY(tty, "s", TOYFLAG_USR|TOYFLAG_BIN))
8 
9 config TTY
10   bool "tty"
11   default y
12   help
13     usage: tty [-s]
14 
15     Show filename of terminal connected to stdin.
16 
17     Prints "not a tty" and exits with nonzero status if no terminal
18     is connected to stdin.
19 
20     -s	silent, exit code only
21 */
22 
23 #include "toys.h"
24 
tty_main(void)25 void tty_main(void)
26 {
27   char *tty = ttyname(0);
28 
29   if (!toys.optflags) puts(tty ? tty : "not a tty");
30 
31   toys.exitval = !tty;
32 }
33