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/* 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 */
};
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