1 files changed, 83 insertions, 0 deletions
diff --git a/examples/loadables/tty.c b/examples/loadables/tty.c
new file mode 100644
index 0000000..381df25
--- /dev/null
+++ b/examples/loadables/tty.c
@@ -0,0 +1,83 @@
+/* tty - return terminal name */
+
+/* See Makefile for compilation details. */
+
+/*
+   Copyright (C) 1999-2021 Free Software Foundation, Inc.
+
+   This file is part of GNU Bash.
+   Bash 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 3 of the License, or
+   (at your option) any later version.
+
+   Bash 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 Bash.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "config.h"
+
+#include <stdio.h>
+#include "builtins.h"
+#include "shell.h"
+#include "bashgetopt.h"
+#include "common.h"
+
+extern char *ttyname ();
+
+int
+tty_builtin (list)
+     WORD_LIST *list;
+{
+  int opt, sflag;
+  char *t;
+
+  reset_internal_getopt ();
+  sflag = 0;
+  while ((opt = internal_getopt (list, "s")) != -1)
+    {
+      switch (opt)
+	{
+	case 's':
+	  sflag = 1;
+	  break;
+	CASE_HELPOPT;
+	default:
+	  builtin_usage ();
+	  return (EX_USAGE);
+	}
+    }
+  list = loptend;
+
+  t = ttyname (0);
+  QUIT;
+  if (sflag == 0)
+    puts (t ? t : "not a tty");
+  return (t ? EXECUTION_SUCCESS : EXECUTION_FAILURE);
+}
+
+char *tty_doc[] = {
+	"Display terminal name.",
+	"",
+	"tty writes the name of the terminal that is opened for standard",
+	"input to standard output.  If the `-s' option is supplied, nothing",
+	"is written; the exit status determines whether or not the standard",
+	"input is connected to a tty.",
+	(char *)NULL
+};
+
+/* The standard structure describing a builtin command.  bash keeps an array
+   of these structures. */
+struct builtin tty_struct = {
+	"tty",			/* builtin name */
+	tty_builtin,		/* function implementing the builtin */
+	BUILTIN_ENABLED,	/* initial flags for builtin */
+	tty_doc,		/* array of long documentation strings. */
+	"tty [-s]",		/* usage synopsis; becomes short_doc */
+	0			/* reserved for internal use */
+};