1 files changed, 42 insertions, 0 deletions

diff --git a/tty.c b/tty.c
new file mode 100644
index 000000000..83abaffb5
--- /dev/null
+++ b/tty.c
@@ -0,0 +1,42 @@
+/*
+ * Mini tty implementation for busybox
+ *
+ * Copyright (C) 2000  Edward Betts <edward@debian.org>.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include "internal.h"
+#include <stdio.h>
+#include <sys/types.h>
+
+static const char tty_usage[] = "tty\n\n"
+"Print the file name of the terminal connected to standard input.\n"
+"\t-s\tprint nothing, only return an exit status\n";
+
+extern int tty_main(int argc, char **argv) {
+        char *tty;
+
+        if (argc > 1) {
+                if (argv[1][0] != '-' || argv[1][1] != 's') usage (tty_usage);
+        }
+        else {
+                tty = ttyname (0);
+                if (tty) puts (tty);
+                else puts ("not a tty");
+        }
+        exit (isatty (0) ? TRUE : FALSE);
+}