mirror of
https://github.com/topjohnwu/ndk-busybox.git
synced 2024-11-30 07:00:48 +00:00
51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Mini tty implementation for busybox
|
|
*
|
|
* Copyright (C) 2000 Edward Betts <edward@debian.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
|
|
*
|
|
*/
|
|
|
|
#include "internal.h"
|
|
#include <stdio.h>
|
|
#include <sys/types.h>
|
|
|
|
static const char tty_usage[] = "tty\n"
|
|
#ifndef BB_FEATURE_TRIVIAL_HELP
|
|
"\nPrint the file name of the terminal connected to standard input.\n\n"
|
|
"Options:\n"
|
|
"\t-s\tprint nothing, only return an exit status\n"
|
|
#endif
|
|
;
|
|
|
|
extern int tty_main(int argc, char **argv)
|
|
{
|
|
char *tty;
|
|
|
|
if (argc > 1) {
|
|
if (argv[1][0] != '-' || argv[1][1] != 's')
|
|
usage(tty_usage);
|
|
} else {
|
|
tty = ttyname(0);
|
|
if (tty)
|
|
puts(tty);
|
|
else
|
|
puts("not a tty");
|
|
}
|
|
return(isatty(0) ? TRUE : FALSE);
|
|
}
|