aboutsummaryrefslogtreecommitdiff
path: root/toys/posix/tty.c
diff options
context:
space:
mode:
Diffstat (limited to 'toys/posix/tty.c')
-rw-r--r--toys/posix/tty.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/toys/posix/tty.c b/toys/posix/tty.c
new file mode 100644
index 00000000..661e919a
--- /dev/null
+++ b/toys/posix/tty.c
@@ -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;
+}