mirror of
https://github.com/sheumann/hush.git
synced 2024-11-05 06:07:00 +00:00
43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* tty implementation for busybox
|
|
*
|
|
* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
|
*/
|
|
|
|
/* BB_AUDIT SUSv3 compliant */
|
|
/* http://www.opengroup.org/onlinepubs/007904975/utilities/tty.html */
|
|
|
|
#include "libbb.h"
|
|
|
|
int tty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int tty_main(int argc, char **argv)
|
|
{
|
|
const char *s;
|
|
USE_INCLUDE_SUSv2(int silent;) /* Note: No longer relevant in SUSv3. */
|
|
int retval;
|
|
|
|
xfunc_error_retval = 2; /* SUSv3 requires > 1 for error. */
|
|
|
|
USE_INCLUDE_SUSv2(silent = getopt32(argv, "s");)
|
|
|
|
/* gnu tty outputs a warning that it is ignoring all args. */
|
|
bb_warn_ignoring_args(argc - optind);
|
|
|
|
retval = 0;
|
|
|
|
s = ttyname(0);
|
|
if (s == 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;
|
|
}
|
|
USE_INCLUDE_SUSv2(if (!silent) puts(s);)
|
|
SKIP_INCLUDE_SUSv2(puts(s);)
|
|
|
|
fflush_stdout_and_exit(retval);
|
|
}
|