Add a evkill demo

Usage: evkill <-k, --keys keys> <-d, --device evdev> <programs>
eg: evkill -k 304+305 -d /dev/input/event3 retroarch

Signed-off-by: Ning Bo <n.b@live.com>

tools/test/evkill.c

@@ -0,0 +1,113 @@
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <fcntl.h>
+#include <linux/input.h>
+
+void set_bit(char *mem, int key) {
+	int8_t *byte = (int8_t *)mem + key / 8;
+	*byte |= 1 << key % 8;
+}
+
+void clr_bit(char *mem, int key) {
+	int8_t *byte = (int8_t *)mem + key / 8;
+	*byte &= ~(1 << key % 8);
+}
+
+static const struct option long_options[] = {
+	{"device", required_argument, NULL, 'd'},
+	{"keys", required_argument, NULL, 'k'},
+	{0, 0, 0, 0}
+};
+
+int main(int argc, char* argv[])
+{
+	int ret = 0;
+	int opt = 0;
+	struct input_event ev;
+	char *evdev = NULL, *keys = NULL;
+	char cmd[1024];
+
+	int size = (KEY_CNT - 1) / 8 + 1;
+	char *bitmap0 = (char *)malloc(size);
+	char *bitmap1 = (char *)malloc(size);
+	memset(bitmap0, 0x0, size);
+	memset(bitmap1, 0x0, size);
+
+	while((opt = getopt_long(argc, argv, "d:k:", long_options, NULL)) != -1)
+	{
+		switch(opt)
+		{
+			case 'd':
+				evdev = strdup(optarg);
+				break;
+			case 'k':
+				keys = strdup(optarg);
+				break;
+			default:
+				printf("Usage: %s <-k, --keys keys> <-d, --device evdev> <programe...>\n", argv[0]);
+				exit(1);
+				break;
+		}
+	}
+
+	if (evdev == NULL || keys== NULL || optind == argc) {
+		printf("Usage: %s <-k, --keys keys> <-d, --device evdev> <programe...>\n", argv[0]);
+		exit(1);
+	}
+
+	strcpy(cmd, "killall ");
+	int i;
+	for (i = optind; i < argc; i++) {
+		strcat(cmd, argv[i]);
+	}
+
+	char *str, *saveptr, *key;
+	for (i = 0, str = keys; ; i++, str = NULL) {
+		key = strtok_r(str, ",+", &saveptr);
+		if (key == NULL)
+			break;
+
+		set_bit(bitmap0, atoi(key));
+	}
+
+	while(1) {
+		int fd = open(evdev, O_RDONLY);
+		if (fd < 0) {
+			perror("open");
+			sleep(1);
+			continue;
+		}
+
+		while(1) {
+			ret = read(fd, &ev, sizeof(struct input_event));
+			if (ret < 0) {
+				perror("read");
+				break;
+			}
+
+			if (ev.type == EV_KEY) {
+				if (ev.value == 0) {
+					clr_bit(bitmap1, ev.code);
+					continue;
+				} else {
+					set_bit(bitmap1, ev.code);
+				}
+			}
+
+			if (memcmp(bitmap0, bitmap1, size) == 0) {
+				memset(bitmap1, 0x0, size);
+				printf("execute cmd: %s\n", cmd);
+				system(cmd);
+			}
+		}
+
+		close(fd);
+	}
+
+	return 0;
+}
+