72089cf6b4
Those two spaces after tab have no effect, and always a nuisance when editing. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* tty implementation for busybox
|
|
*
|
|
* 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(tty, BB_DIR_USR_BIN, BB_SUID_DROP))
|
|
|
|
//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 UNUSED_PARAM, char **argv)
|
|
{
|
|
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;
|
|
}
|
|
IF_INCLUDE_SUSv2(if (!silent) puts(s);)
|
|
IF_NOT_INCLUDE_SUSv2(puts(s);)
|
|
|
|
fflush_stdout_and_exit(retval);
|
|
}
|