view toys/tty.c @ 582:b88bc7dcdb48

Update chgrp so -R works, tweaking DIRTREE_COMEAGAIN design along the way.
author Rob Landley <rob@landley.net>
date Sun, 27 May 2012 00:56:17 -0500
parents 782859fadd20
children
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/* vi: set sw=4 ts=4:
 *
 * 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
	  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 mode
*/

#include "toys.h"

void tty_main(void)
{
	char *tty = ttyname(0);

	if (!toys.optflags) puts(tty ? tty : "not a tty");

	toys.exitval = !tty;
}