added test folder

tests/ioctl.c

@@ -0,0 +1,67 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <linux/input.h>
+
+#define test_bit(yalv, abs_b) ((((char *)abs_b)[yalv/8] & (1<<yalv%8)) > 0)
+
+const char ev_root[] = "/dev/input/";
+
+int main (void)
+{
+	/* Open the event directory */
+	DIR *ev_dir = opendir(ev_root);
+	if (!ev_dir) 
+		exit(-1);
+
+	for (;;) {
+		struct dirent *file_ent;
+		char ev_path[sizeof(ev_root) + NAME_MAX + 1];
+		int tmp_fd;
+		unsigned char evtype_b[EV_MAX];
+		
+		if ((file_ent = readdir(ev_dir)) == NULL)
+			break;
+		/* Filter out non character devices */
+		if (file_ent->d_type != DT_CHR)
+			continue;
+			
+		/* Compose absolute path from relative */
+		memset(ev_path, 0, sizeof(ev_path));
+		strncpy(ev_path, ev_root, sizeof(ev_root) + NAME_MAX);
+	   	strncat(ev_path, file_ent->d_name, sizeof(ev_root) + NAME_MAX);
+	   	fprintf(stderr, "%s\n", ev_path);
+
+		/* Open device and check if it can give key events otherwise ignore it */
+		tmp_fd = open(ev_path, O_RDONLY | O_NONBLOCK);
+		if (tmp_fd < 0) {
+			fprintf(stdout, "Could not open device %s\n", ev_path);
+			continue;
+		}
+	   	fprintf(stderr, "%s\n", ev_path);
+
+		memset(evtype_b, 0, sizeof(evtype_b));
+		if (ioctl(tmp_fd, EVIOCGBIT(0, EV_MAX), evtype_b) < 0) {
+			fprintf(stdout, "Could not read capabilities of device %s\n",
+				ev_path);
+			close(tmp_fd);
+			continue;
+		}
+	   	fprintf(stderr, "%s\n", ev_path);
+	
+		if (test_bit(EV_KEY, evtype_b))
+			fprintf(stdout, "device %s has it!\n", ev_path);
+
+
+		fprintf(stdout, "\n\n\n\n");
+		close(tmp_fd);
+	}
+
+	printf("%d", EV_MAX);
+	closedir(ev_dir);
+}