2000-02-08 19:58:47 +00:00
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/* vi: set sw=4 ts=4: */
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2000-01-15 22:28:50 +00:00
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/*
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2003-03-19 09:13:01 +00:00
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* tty implementation for busybox
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2000-01-15 22:28:50 +00:00
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*
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2003-03-19 09:13:01 +00:00
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* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
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2000-01-15 22:28:50 +00:00
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*
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2006-07-12 07:56:04 +00:00
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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2000-01-15 22:28:50 +00:00
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*/
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2003-03-19 09:13:01 +00:00
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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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2007-05-26 19:00:18 +00:00
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#include "libbb.h"
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2000-01-15 22:28:50 +00:00
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2007-10-11 10:05:36 +00:00
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int tty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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2008-07-05 09:18:54 +00:00
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int tty_main(int argc, char **argv SKIP_INCLUDE_SUSv2(UNUSED_PARAM))
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2000-02-08 19:58:47 +00:00
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{
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2003-03-19 09:13:01 +00:00
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const char *s;
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2007-01-20 21:32:20 +00:00
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USE_INCLUDE_SUSv2(int silent;) /* Note: No longer relevant in SUSv3. */
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2003-03-19 09:13:01 +00:00
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int retval;
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2006-10-03 20:28:06 +00:00
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xfunc_error_retval = 2; /* SUSv3 requires > 1 for error. */
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2003-03-19 09:13:01 +00:00
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2007-08-18 15:32:12 +00:00
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USE_INCLUDE_SUSv2(silent = getopt32(argv, "s");)
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2008-03-17 09:00:54 +00:00
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USE_INCLUDE_SUSv2(argc -= optind;)
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SKIP_INCLUDE_SUSv2(argc -= 1;)
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2003-03-19 09:13:01 +00:00
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/* gnu tty outputs a warning that it is ignoring all args. */
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2008-03-17 09:00:54 +00:00
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bb_warn_ignoring_args(argc);
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2003-03-19 09:13:01 +00:00
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retval = 0;
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2007-04-10 15:43:37 +00:00
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s = ttyname(0);
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if (s == NULL) {
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2008-03-17 09:00:54 +00:00
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/* According to SUSv3, ttyname can fail with EBADF or ENOTTY.
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2003-03-19 09:13:01 +00:00
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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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2007-01-20 21:32:20 +00:00
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USE_INCLUDE_SUSv2(if (!silent) puts(s);)
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SKIP_INCLUDE_SUSv2(puts(s);)
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2003-03-19 09:13:01 +00:00
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2006-10-26 23:21:47 +00:00
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fflush_stdout_and_exit(retval);
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2000-01-15 22:28:50 +00:00
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}
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