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-rw-r--r--console-tools/showkey.c73
1 files changed, 33 insertions, 40 deletions
diff --git a/console-tools/showkey.c b/console-tools/showkey.c
index 149ea6465..b29c84d6a 100644
--- a/console-tools/showkey.c
+++ b/console-tools/showkey.c
@@ -10,27 +10,7 @@
#include "libbb.h"
#include <linux/kd.h>
-// set raw tty mode
-// also used by microcom
-// libbb candidates?
-static void xget1(struct termios *t, struct termios *oldt)
-{
- tcgetattr(STDIN_FILENO, oldt);
- *t = *oldt;
- cfmakeraw(t);
-}
-
-static void xset1(struct termios *tio)
-{
- int ret = tcsetattr(STDIN_FILENO, TCSAFLUSH, tio);
- if (ret) {
- bb_perror_msg("can't tcsetattr for stdin");
- }
-}
-/*
- * GLOBALS
- */
struct globals {
int kbmode;
struct termios tio, tio0;
@@ -44,13 +24,22 @@ struct globals {
} while (0)
-static void signal_handler(int signo)
+// set raw tty mode
+// also used by microcom
+// libbb candidates?
+static void xget1(struct termios *t, struct termios *oldt)
{
- // restore keyboard and console settings
- xset1(&tio0);
- xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)kbmode);
- // alarmed? -> exit 0
- exit(SIGALRM == signo);
+ tcgetattr(STDIN_FILENO, oldt);
+ *t = *oldt;
+ cfmakeraw(t);
+}
+
+static void xset1(struct termios *t)
+{
+ int ret = tcsetattr(STDIN_FILENO, TCSAFLUSH, t);
+ if (ret) {
+ bb_perror_msg("can't tcsetattr for stdin");
+ }
}
int showkey_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
@@ -62,20 +51,21 @@ int showkey_main(int argc UNUSED_PARAM, char **argv)
OPT_s = (1<<2), // display only the raw scan-codes
};
+ INIT_G();
+
// 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"
+ (kbmode == K_UNICODE ? "UNICODE" : "UNKNOWN")))
+ , (option_mask32 & OPT_a) ? "on EOF (ctrl-D)" : "10s after last keypress"
);
+
// prepare for raw mode
xget1(&tio, &tio0);
// put stdin in raw mode
@@ -83,34 +73,37 @@ int showkey_main(int argc UNUSED_PARAM, char **argv)
if (option_mask32 & OPT_a) {
unsigned char c;
+
// just read stdin char by char
- while (1 == safe_read(STDIN_FILENO, &c, 1)) {
+ while (1 == read(STDIN_FILENO, &c, 1)) {
printf("%3u 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 *)(ptrdiff_t)((option_mask32 & OPT_k) ? K_MEDIUMRAW : K_RAW));
+ // we should exit on any signal; signals should interrupt read
+ bb_signals_recursive_norestart(BB_FATAL_SIGS, record_signo);
+
// read and show scancodes
- while (1) {
+ while (!bb_got_signal) {
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) {
+ // show raw scancodes
printf("0x%02x ", buf[i++]);
- // show interpreted scancodes (default) ? ->
} else {
+ // show interpreted scancodes (default)
+ char c = buf[i];
int kc;
if (i+2 < n
&& (c & 0x7f) == 0
@@ -130,9 +123,9 @@ int showkey_main(int argc UNUSED_PARAM, char **argv)
}
}
- // cleanup
- signal_handler(SIGALRM);
+ // restore keyboard and console settings
+ xset1(&tio0);
+ xioctl(STDIN_FILENO, KDSKBMODE, (void *)(ptrdiff_t)kbmode);
- // should never be here!
return EXIT_SUCCESS;
}