1 /* tty -- print the path of the terminal connected to standard input
2 Copyright (C) 1990-2003 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18 /* Displays "not a tty" if stdin is not a terminal.
19 Displays nothing if -s option is given.
20 Exit status 0 if stdin is a tty, 1 if not, 2 if usage error,
23 Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
28 #include <sys/types.h>
34 /* The official name of this program (e.g., no `g' prefix). */
35 #define PROGRAM_NAME "tty"
37 #define WRITTEN_BY _("Written by David MacKenzie.")
39 /* The name under which this program was run. */
42 /* If nonzero, return an exit status but produce no output. */
45 static struct option const longopts[] =
47 {"silent", no_argument, NULL, 's'},
48 {"quiet", no_argument, NULL, 's'},
49 {GETOPT_HELP_OPTION_DECL},
50 {GETOPT_VERSION_OPTION_DECL},
58 fprintf (stderr, _("Try `%s --help' for more information.\n"),
62 printf (_("Usage: %s [OPTION]...\n"), program_name);
64 Print the file name of the terminal connected to standard input.\n\
66 -s, --silent, --quiet print nothing, only return an exit status\n\
68 fputs (HELP_OPTION_DESCRIPTION, stdout);
69 fputs (VERSION_OPTION_DESCRIPTION, stdout);
70 printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
76 main (int argc, char **argv)
81 initialize_main (&argc, &argv);
82 program_name = argv[0];
83 setlocale (LC_ALL, "");
84 bindtextdomain (PACKAGE, LOCALEDIR);
88 atexit (close_stdout);
92 while ((optc = getopt_long (argc, argv, "s", longopts, NULL)) != -1)
103 case_GETOPT_HELP_CHAR;
105 case_GETOPT_VERSION_CHAR (PROGRAM_NAME, WRITTEN_BY);
113 error (0, 0, _("ignoring all arguments"));
121 puts (_("not a tty"));
124 exit (isatty (0) ? 0 : 1);