mirror of
https://github.com/sheumann/hush.git
synced 2024-11-05 06:07:00 +00:00
59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
/* 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);
|
|
}
|