81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/* tty - return terminal name */
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/* See Makefile for compilation details. */
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/*
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Copyright (C) 1999-2009 Free Software Foundation, Inc.
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This file is part of GNU Bash.
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Bash is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Bash is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Bash. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <stdio.h>
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#include "builtins.h"
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#include "shell.h"
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#include "bashgetopt.h"
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#include "common.h"
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extern char *ttyname ();
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int
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tty_builtin (list)
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WORD_LIST *list;
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{
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int opt, sflag;
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char *t;
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reset_internal_getopt ();
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sflag = 0;
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while ((opt = internal_getopt (list, "s")) != -1)
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{
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switch (opt)
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{
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case 's':
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sflag = 1;
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break;
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default:
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builtin_usage ();
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return (EX_USAGE);
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}
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}
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list = loptend;
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t = ttyname (0);
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if (sflag == 0)
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puts (t ? t : "not a tty");
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return (t ? EXECUTION_SUCCESS : EXECUTION_FAILURE);
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}
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char *tty_doc[] = {
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"Display terminal name.",
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"",
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"tty writes the name of the terminal that is opened for standard",
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"input to standard output. If the `-s' option is supplied, nothing",
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"is written; the exit status determines whether or not the standard",
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"input is connected to a tty.",
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(char *)NULL
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};
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/* The standard structure describing a builtin command. bash keeps an array
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of these structures. */
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struct builtin tty_struct = {
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"tty", /* builtin name */
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tty_builtin, /* function implementing the builtin */
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BUILTIN_ENABLED, /* initial flags for builtin */
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tty_doc, /* array of long documentation strings. */
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"tty [-s]", /* usage synopsis; becomes short_doc */
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0 /* reserved for internal use */
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};
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