1 files changed, 58 insertions, 0 deletions

diff --git a/busybox/coreutils/tty.c b/busybox/coreutils/tty.c
new file mode 100644
index 000000000..cd2c784fd
--- /dev/null
+++ b/busybox/coreutils/tty.c
@@ -0,0 +1,58 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * tty implementation for busybox
+ *
+ * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.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
+ *
+ */
+
+/* BB_AUDIT SUSv3 compliant */
+/* http://www.opengroup.org/onlinepubs/007904975/utilities/tty.html */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "busybox.h"
+
+extern int tty_main(int argc, char **argv)
+{
+        const char *s;
+        int silent;             /* Note: No longer relevant in SUSv3. */
+        int retval;
+
+        bb_default_error_retval = 2;    /* SUSv3 requires > 1 for error. */
+
+        silent = bb_getopt_ulflags(argc, argv, "s");
+
+        /* gnu tty outputs a warning that it is ignoring all args. */
+        bb_warn_ignoring_args(argc - optind);
+
+        retval = 0;
+
+        if ((s = ttyname(0)) == NULL) {
+        /* According to SUSv3, ttyname can on fail with EBADF or ENOTTY.
+         * We know the file descriptor is good, so failure means not a tty. */
+                s = "not a tty";
+                retval = 1;
+        }
+
+        if (!silent) {
+                puts(s);
+        }
+
+        bb_fflush_stdout_and_exit(retval);
+}