busybox/console-tools/reset.c
Denys Vlasenko 5c527dc57e make 17 state-changing execing applets (ex: "nice PROG ARGS") noexec
The applets with "<applet> [opts] PROG ARGS" API very quickly exec
another program, noexec is okay for them:

 chpst/envdir/envuidgid/softlimit/setuidgid
 chroot
 chrt
 ionice
 nice
 nohup
 setarch/linux32/linux64
 taskset
 cttyhack

"reset" and "sulogin" applets don't have this form, but also exec
another program at once, thus made noexec too.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-04 19:55:01 +02:00

66 lines
1.8 KiB
C

/* vi: set sw=4 ts=4: */
/*
* Mini reset implementation for busybox
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
* Written by Erik Andersen and Kent Robotti <robotti@metconnect.com>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
/* "Standard" version of this tool is in ncurses package */
//config:config RESET
//config: bool "reset (275 bytes)"
//config: default y
//config: help
//config: This program is used to reset the terminal screen, if it
//config: gets messed up.
//applet:IF_RESET(APPLET_NOEXEC(reset, reset, BB_DIR_USR_BIN, BB_SUID_DROP, reset))
//kbuild:lib-$(CONFIG_RESET) += reset.o
//usage:#define reset_trivial_usage
//usage: ""
//usage:#define reset_full_usage "\n\n"
//usage: "Reset the screen"
#include "libbb.h"
#define ESC "\033"
#if ENABLE_STTY
int stty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
#endif
int reset_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int reset_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
static const char *const args[] = {
"stty", "sane", NULL
};
/* no options, no getopt */
if (/*isatty(STDIN_FILENO) &&*/ isatty(STDOUT_FILENO)) {
/* See 'man 4 console_codes' for details:
* "ESC c" -- Reset
* "ESC ( B" -- Select G0 Character Set (B = US)
* "ESC [ 0 m" -- Reset all display attributes
* "ESC [ J" -- Erase to the end of screen
* "ESC [ ? 25 h" -- Make cursor visible
*/
printf(ESC"c" ESC"(B" ESC"[0m" ESC"[J" ESC"[?25h");
/* http://bugs.busybox.net/view.php?id=1414:
* people want it to reset echo etc: */
#if ENABLE_STTY
return stty_main(2, (char**)args);
#else
/* Make sure stdout gets drained before we execvp */
fflush_all();
execvp("stty", (char**)args);
#endif
}
return EXIT_SUCCESS;
}