diff options
Diffstat (limited to 'console-tools')
| -rw-r--r-- | console-tools/Config.in | 6 | ||||
| -rw-r--r-- | console-tools/Kbuild | 1 | ||||
| -rw-r--r-- | console-tools/showkey.c | 138 |
3 files changed, 145 insertions, 0 deletions
diff --git a/console-tools/Config.in b/console-tools/Config.in index efba9cd09..a08ee42f7 100644 --- a/console-tools/Config.in +++ b/console-tools/Config.in @@ -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 diff --git a/console-tools/Kbuild b/console-tools/Kbuild index 0a182500e..df5ffdb96 100644 --- a/console-tools/Kbuild +++ b/console-tools/Kbuild @@ -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 diff --git a/console-tools/showkey.c b/console-tools/showkey.c new file mode 100644 index 000000000..e4603e2d3 --- /dev/null +++ b/console-tools/showkey.c @@ -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; +} |