Bump to version 1.22.1

[platform/upstream/busybox.git] / coreutils / tty.c

diff --git a/coreutils/tty.c b/coreutils/tty.c
index 2a64b14..4517505 100644 (file)
--- a/coreutils/tty.c
+++ b/coreutils/tty.c
@@ -1,44 +1,56 @@
 /* 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.
  */
 
-#include "busybox.h"
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <sys/types.h>
+/* BB_AUDIT SUSv4 compliant */
+/* http://www.opengroup.org/onlinepubs/9699919799/utilities/tty.html */
 
-extern int tty_main(int argc, char **argv)
+//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 "libbb.h"
+
+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) ? EXIT_SUCCESS : EXIT_FAILURE);
+       IF_INCLUDE_SUSv2(if (!silent) puts(s);)
+       IF_NOT_INCLUDE_SUSv2(puts(s);)
+
+       fflush_stdout_and_exit(retval);
 }