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/* tty.c - Show stdin's terminal name
*
* Copyright 2011 Rob Landley <rob@landley.net>
*
* See http://opengroup.org/onlinepubs/9699919799/utilities/tty.html
USE_TTY(NEWTOY(tty, "s", TOYFLAG_USR|TOYFLAG_BIN))
config TTY
bool "tty"
default y
help
usage: tty [-s]
Show filename of terminal connected to stdin.
Prints "not a tty" and exits with nonzero status if no terminal
is connected to stdin.
-s silent, exit code only
*/
#include "toys.h"
void tty_main(void)
{
char *tty = ttyname(0);
if (!toys.optflags) puts(tty ? tty : "not a tty");
toys.exitval = !tty;
}