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showkey: new applet by Vladimir

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This commit is contained in:
Denis Vlasenko 2008-08-17 14:17:48 +00:00
parent c8d02aa959
commit d7cc2e601d
5 changed files with 156 additions and 1 deletions
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6
console-tools/Config.in
View File

@ -114,4 +114,10 @@ config SETLOGCONS
help
This program redirects the output console of kernel messages.
config SHOWKEY
bool "showkey"
default n
help
Shows keys presses.
endmenu

1
console-tools/Kbuild
View File

@ -19,3 +19,4 @@ lib-$(CONFIG_RESIZE) += resize.o
lib-$(CONFIG_SETFONT) += loadfont.o
lib-$(CONFIG_SETKEYCODES) += setkeycodes.o
lib-$(CONFIG_SETLOGCONS) += setlogcons.o
lib-$(CONFIG_SHOWKEY) += showkey.o

138
console-tools/showkey.c Normal file
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@ -0,0 +1,138 @@
/* vi: set sw=4 ts=4: */
/*
* shows keys pressed. inspired by kbd package
*
* Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
*
* Licensed under GPLv2, see file LICENSE in this tarball for details.
*/
#include "libbb.h"
#include <linux/kd.h>
// set raw tty mode
// also used by microcom
// libbb candidates?
static void xget1(int fd, struct termios *t, struct termios *oldt)
{
tcgetattr(fd, oldt);
*t = *oldt;
cfmakeraw(t);
}
static int xset1(int fd, struct termios *tio, const char *device)
{
int ret = tcsetattr(fd, TCSAFLUSH, tio);
if (ret) {
bb_perror_msg("can't tcsetattr for %s", device);
}
return ret;
}
/*
* GLOBALS
*/
struct globals {
int kbmode;
struct termios tio, tio0;
};
#define G (*ptr_to_globals)
#define kbmode (G.kbmode)
#define tio (G.tio)
#define tio0 (G.tio0)
#define INIT_G() do { \
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
} while (0)
static void signal_handler(int signo)
{
// restore keyboard and console settings
xset1(STDIN_FILENO, &tio0, "stdin");
xioctl(STDIN_FILENO, KDSKBMODE, (void *)kbmode);
// alarmed? -> exit 0
exit(SIGALRM == signo);
}
int showkey_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int showkey_main(int argc UNUSED_PARAM, char **argv)
{
enum {
OPT_a = (1<<0), // display the decimal/octal/hex values of the keys
OPT_k = (1<<1), // display only the interpreted keycodes (default)
OPT_s = (1<<2), // display only the raw scan-codes
};
// FIXME: aks are all mutually exclusive
getopt32(argv, "aks");
INIT_G();
// get keyboard settings
xioctl(STDIN_FILENO, KDGKBMODE, &kbmode);
printf("kb mode was %s\n\nPress any keys. Program terminates %s\n\n",
kbmode == K_RAW ? "RAW" :
(kbmode == K_XLATE ? "XLATE" :
(kbmode == K_MEDIUMRAW ? "MEDIUMRAW" :
(kbmode == K_UNICODE ? "UNICODE" : "?UNKNOWN?")))
, (option_mask32 & OPT_a) ? "when CTRL+D pressed" : "10s after last keypress"
);
// prepare for raw mode
xget1(STDIN_FILENO, &tio, &tio0);
// put stdin in raw mode
xset1(STDIN_FILENO, &tio, "stdin");
if (option_mask32 & OPT_a) {
char c;
// just read stdin char by char
while (1 == safe_read(STDIN_FILENO, &c, 1)) {
printf("%3d 0%03o 0x%02x\r\n", c, c, c);
if (04 /*CTRL-D*/ == c)
break;
}
} else {
// we should exit on any signal
bb_signals(BB_FATAL_SIGS, signal_handler);
// set raw keyboard mode
xioctl(STDIN_FILENO, KDSKBMODE, (void *)((option_mask32 & OPT_k) ? K_MEDIUMRAW : K_RAW));
// read and show scancodes
while (1) {
char buf[18];
int i, n;
// setup 10s watchdog
alarm(10);
// read scancodes
n = read(STDIN_FILENO, buf, sizeof(buf));
i = 0;
while (i < n) {
char c = buf[i];
// show raw scancodes ordered? ->
if (option_mask32 & OPT_s) {
printf("0x%02x ", buf[i++]);
// show interpreted scancodes (default) ? ->
} else {
int kc;
if (i+2 < n && (c & 0x7f) == 0
&& (buf[i+1] & 0x80) != 0
&& (buf[i+2] & 0x80) != 0) {
kc = ((buf[i+1] & 0x7f) << 7) | (buf[i+2] & 0x7f);
i += 3;
} else {
kc = (c & 0x7f);
i++;
}
printf("keycode %3d %s", kc, (c & 0x80) ? "release" : "press");
}
}
puts("\r");
}
}
// cleanup
signal_handler(SIGALRM);
// should never be here!
return EXIT_SUCCESS;
}

3
include/applets.h
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@ -329,6 +329,7 @@ USE_FEATURE_SH_IS_ASH(APPLET_ODDNAME(sh, ash, _BB_DIR_BIN, _BB_SUID_NEVER, sh))
USE_FEATURE_SH_IS_HUSH(APPLET_ODDNAME(sh, hush, _BB_DIR_BIN, _BB_SUID_NEVER, sh))
USE_FEATURE_SH_IS_MSH(APPLET_ODDNAME(sh, msh, _BB_DIR_BIN, _BB_SUID_NEVER, sh))
USE_SHA1SUM(APPLET_ODDNAME(sha1sum, md5_sha1_sum, _BB_DIR_USR_BIN, _BB_SUID_NEVER, sha1sum))
USE_SHOWKEY(APPLET(showkey, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
USE_SLATTACH(APPLET(slattach, _BB_DIR_SBIN, _BB_SUID_NEVER))
USE_SLEEP(APPLET_NOFORK(sleep, sleep, _BB_DIR_BIN, _BB_SUID_NEVER, sleep))
USE_SOFTLIMIT(APPLET_ODDNAME(softlimit, chpst, _BB_DIR_USR_BIN, _BB_SUID_NEVER, softlimit))
@ -342,7 +343,7 @@ USE_SU(APPLET(su, _BB_DIR_BIN, _BB_SUID_ALWAYS))
USE_SULOGIN(APPLET(sulogin, _BB_DIR_SBIN, _BB_SUID_NEVER))
USE_SUM(APPLET(sum, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
USE_SV(APPLET(sv, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
USE_SVLOGD(APPLET(svlogd, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
USE_SVLOGD(APPLET(svlogd, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
USE_SWAPONOFF(APPLET_ODDNAME(swapoff, swap_on_off, _BB_DIR_SBIN, _BB_SUID_NEVER,swapoff))
USE_SWAPONOFF(APPLET_ODDNAME(swapon, swap_on_off, _BB_DIR_SBIN, _BB_SUID_NEVER, swapon))
USE_SWITCH_ROOT(APPLET(switch_root, _BB_DIR_SBIN, _BB_SUID_NEVER))

9
include/usage.h
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@ -3568,6 +3568,15 @@
"\n -w Warn about improperly formatted SHA1 checksum lines" \
)
#define showkey_trivial_usage \
"[-a | -k | -s]"
#define showkey_full_usage "\n\n" \
"Show keys pressed\n" \
"\nOptions:" \
"\n -a Display decimal/octal/hex values of the keys" \
"\n -k Display interpreted keycodes (default)" \
"\n -s Display raw scan-codes" \
#define slattach_trivial_usage \
"[-cehmLF] [-s speed] [-p protocol] DEVICEs"
#define slattach_full_usage "\n\n" \