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view toys/posix/tty.c @ 674:7e846e281e38

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New build infrastructure to generate FLAG_ macros and TT alias, #define FOR_commandname before #including toys.h to trigger it. Rename DEFINE_GLOBALS() to just GLOBALS() (because I could never remember if it was DECLARE_GLOBALS). Convert existing commands to use new infrastructure, and replace optflag constants with FLAG_ macros where appropriate.
author Rob Landley <rob@landley.net>
date Mon, 08 Oct 2012 00:02:30 -0500
parents 2986aa63a021
children 786841fdb1e0
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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;
}