Implement user space tool to achieve interactivity

In order to interact with kmldrv device driver, we need an userspace
tool which can performs different operations to "/dev/kmldrv". We
implement kmldrv-user , currently the tool supports displaying the
status of the driver and display the gaming process in kernel space.

Author: vax-r

Makefile

@@ -2,17 +2,24 @@ TARGET = kmldrv
 kmldrv-objs = simrupt.o game.o wyhash.o mcts.o negamax.o zobrist.o
 obj-m := $(TARGET).o
 
+ccflags-y := -std=gnu99 -Wno-declaration-after-statement
 KDIR ?= /lib/modules/$(shell uname -r)/build
 PWD := $(shell pwd)
 
 GIT_HOOKS := .git/hooks/applied
-all: $(GIT_HOOKS) simrupt.c
+all: kmod kmldrv-user
+
+kmod: $(GIT_HOOKS) simrupt.c
 	$(MAKE) -C $(KDIR) M=$(PWD) modules
 
+kmldrv-user: kmldrv-user.c
+	$(CC) $(ccflags-y) -o $@ $<
+
 $(GIT_HOOKS):
 	@scripts/install-git-hooks
 	@echo
 
 
 clean:
 	$(MAKE) -C $(KDIR) M=$(PWD) clean
+	$(RM) kmldrv-user

kmldrv-user.c

@@ -0,0 +1,75 @@
+#include <getopt.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "game.h"
+
+#define KMLDRV_STATUS_FILE "/sys/module/kmldrv/initstate"
+#define KMLDRV_DEVICE_FILE "/dev/kmldrv"
+
+bool kmldrv_status_check(void)
+{
+    FILE *fp = fopen(KMLDRV_STATUS_FILE, "r");
+    if (!fp) {
+        printf("kmldrv status : not loaded\n");
+        return false;
+    }
+
+    char read_buf[20];
+    fgets(read_buf, 20, fp);
+    read_buf[strcspn(read_buf, "\n")] = 0;
+    if (!strcmp("live", read_buf))
+        printf("kmldrv status : live\n");
+    else {
+        printf("kmldrv status : %s\n", read_buf);
+        fclose(fp);
+        return false;
+    }
+    fclose(fp);
+    return true;
+}
+
+
+int main(int argc, char *argv[])
+{
+    int c;
+
+    while ((c = getopt(argc, argv, "d:s:ch")) != -1) {
+        switch (c) {
+        case 'h':
+            printf(
+                "kmldrv-user : A userspace tool which supports interactions "
+                "with kmldrv from user-level\n");
+            printf("Usage:\n\n");
+            printf("\t./kmldrv-user [arguments]\n\n");
+            printf("Arguments:\n\n");
+            printf("\t--start - start a tic-tac-toe game\n");
+            printf("\t--release - release kmldrv\n\n");
+            printf("Control Options:\n\n");
+            printf("\t Ctrl + S - Start a tic-tac-toe game\n");
+            printf("\t Ctrl + P - Pause to show the game\n");
+            printf("\t Ctrl + C - Continue to show the game\n");
+            printf("\t Ctrl + R - Restart a tic-tac-toe game\n");
+            return 0;
+        default:
+            printf("Invalid arguments\n");
+            break;
+        }
+    }
+
+    if (!kmldrv_status_check())
+        exit(1);
+
+    FILE *device_ptr = fopen(KMLDRV_DEVICE_FILE, "r");
+    char display_buf[DRAWBUFFER_SIZE];
+    while (fgets(display_buf, DRAWBUFFER_SIZE, device_ptr)) {
+        printf("%s", display_buf);
+    }
+
+    fclose(device_ptr);
+
+    return 0;
+}