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authorRob Landley <rob@landley.net>2011-11-15 00:57:45 -0600
committerRob Landley <rob@landley.net>2011-11-15 00:57:45 -0600
commit9e061712b8098eae9d75b7ff9c6d445f8454ab94 (patch)
tree7fc58343ac358f5b774bb0f9ac8619ad36afd888 /toys/tty.c
parent8d43d913f977e7dd4d6a2a9177a4f303bf60c1c5 (diff)
downloadtoybox-9e061712b8098eae9d75b7ff9c6d445f8454ab94.tar.gz
Implement tty command.
Diffstat (limited to 'toys/tty.c')
-rw-r--r--toys/tty.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/toys/tty.c b/toys/tty.c
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--- /dev/null
+++ b/toys/tty.c
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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;
+}