# HG changeset patch
# User Rob Landley <rob@landley.net>
# Date 1321340265 21600
# Node ID 782859fadd206a6d9e1dc00a5dcf076a9a89730e
# Parent  74526fc22c256e9be91e18a5779aadc9337cdb93
Implement tty command.

diff -r 74526fc22c25 -r 782859fadd20 toys/tty.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toys/tty.c	Tue Nov 15 00:57:45 2011 -0600
@@ -0,0 +1,32 @@
+/* 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;
+}