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59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* tty implementation for busybox
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*
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* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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/* BB_AUDIT SUSv3 compliant */
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/* http://www.opengroup.org/onlinepubs/007904975/utilities/tty.html */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "busybox.h"
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int tty_main(int argc, char **argv)
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{
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const char *s;
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int silent; /* Note: No longer relevant in SUSv3. */
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int retval;
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bb_default_error_retval = 2; /* SUSv3 requires > 1 for error. */
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silent = bb_getopt_ulflags(argc, argv, "s");
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/* gnu tty outputs a warning that it is ignoring all args. */
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bb_warn_ignoring_args(argc - optind);
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retval = 0;
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if ((s = ttyname(0)) == NULL) {
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/* According to SUSv3, ttyname can on fail with EBADF or ENOTTY.
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* We know the file descriptor is good, so failure means not a tty. */
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s = "not a tty";
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retval = 1;
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}
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if (!silent) {
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puts(s);
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}
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bb_fflush_stdout_and_exit(retval);
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}
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