X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=coreutils%2Ftty.c;h=18ad7c566240590fc94a32c1b6b4e42bdcc90959;hb=00bd76728d44901a260f2dcdbeed52b3c85d6b6b;hp=bbc051f6b6ffe8395b157a756206d8191e709ac2;hpb=bf181b9338152759fd56c8009e9a962a84808e7c;p=oweals%2Fbusybox.git

diff --git a/coreutils/tty.c b/coreutils/tty.c
index bbc051f6b..18ad7c566 100644
--- a/coreutils/tty.c
+++ b/coreutils/tty.c
@@ -1,42 +1,66 @@
 /* vi: set sw=4 ts=4: */
 /*
- * Mini tty implementation for busybox
+ * 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
+ * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
  *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
+//config:config TTY
+//config:	bool "tty (3.3 kb)"
+//config:	default y
+//config:	help
+//config:	tty is used to print the name of the current terminal to
+//config:	standard output.
+
+//applet:IF_TTY(APPLET_NOFORK(tty, tty, BB_DIR_USR_BIN, BB_SUID_DROP, tty))
+
+//kbuild:lib-$(CONFIG_TTY) += tty.o
+
+/* BB_AUDIT SUSv4 compliant */
+/* http://www.opengroup.org/onlinepubs/9699919799/utilities/tty.html */
+
+//usage:#define tty_trivial_usage
+//usage:       ""
+//usage:#define tty_full_usage "\n\n"
+//usage:       "Print file name of stdin's terminal"
+//usage:	IF_INCLUDE_SUSv2( "\n"
+//usage:     "\n	-s	Print nothing, only return exit status"
+//usage:	)
+//usage:
+//usage:#define tty_example_usage
+//usage:       "$ tty\n"
+//usage:       "/dev/tty2\n"
 
-#include "internal.h"
-#include <stdio.h>
-#include <sys/types.h>
+#include "libbb.h"
 
-extern int tty_main(int argc, char **argv)
+int tty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int tty_main(int argc UNUSED_PARAM, 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");
+	const char *s;
+	IF_INCLUDE_SUSv2(int silent;)  /* Note: No longer relevant in SUSv3. */
+	int retval;
+
+	xfunc_error_retval = 2;  /* SUSv3 requires > 1 for error. */
+
+	IF_INCLUDE_SUSv2(silent = getopt32(argv, "s");)
+	IF_INCLUDE_SUSv2(argv += optind;)
+	IF_NOT_INCLUDE_SUSv2(argv += 1;)
+
+	/* gnu tty outputs a warning that it is ignoring all args. */
+	bb_warn_ignoring_args(argv[0]);
+
+	retval = EXIT_SUCCESS;
+
+	s = xmalloc_ttyname(STDIN_FILENO);
+	if (s == NULL) {
+	/* According to SUSv3, ttyname can fail with EBADF or ENOTTY.
+	 * We know the file descriptor is good, so failure means not a tty. */
+		s = "not a tty";
+		retval = EXIT_FAILURE;
 	}
-	return(isatty(0) ? TRUE : FALSE);
+	IF_INCLUDE_SUSv2(if (!silent) puts(s);)
+	IF_NOT_INCLUDE_SUSv2(puts(s);)
+
+	fflush_stdout_and_exit(retval);
 }