*
* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * 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.
-/* BB_AUDIT SUSv3 compliant */
-/* http://www.opengroup.org/onlinepubs/007904975/utilities/tty.html */
+//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 "libbb.h"
int tty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int tty_main(int argc, char **argv SKIP_INCLUDE_SUSv2(UNUSED_PARAM))
+int tty_main(int argc UNUSED_PARAM, char **argv)
{
const char *s;
- USE_INCLUDE_SUSv2(int silent;) /* Note: No longer relevant in SUSv3. */
+ IF_INCLUDE_SUSv2(int silent;) /* Note: No longer relevant in SUSv3. */
int retval;
- xfunc_error_retval = 2; /* SUSv3 requires > 1 for error. */
+ xfunc_error_retval = 2; /* SUSv3 requires > 1 for error. */
- USE_INCLUDE_SUSv2(silent = getopt32(argv, "s");)
- USE_INCLUDE_SUSv2(argc -= optind;)
- SKIP_INCLUDE_SUSv2(argc -= 1;)
+ 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(argc);
+ bb_warn_ignoring_args(argv[0]);
- retval = 0;
+ retval = EXIT_SUCCESS;
- s = xmalloc_ttyname(0);
+ 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 = 1;
+ retval = EXIT_FAILURE;
}
- USE_INCLUDE_SUSv2(if (!silent) puts(s);)
- SKIP_INCLUDE_SUSv2(puts(s);)
+ IF_INCLUDE_SUSv2(if (!silent) puts(s);)
+ IF_NOT_INCLUDE_SUSv2(puts(s);)
fflush_stdout_and_exit(retval);
}