modified some syscall code in rlibc, fs stuff

kernel/scheduler.c

@@ -137,6 +137,13 @@ int create_task(uint32_t entry_point, uint32_t cr3) {
     return 1;
 }
 
+process_t* current_task() {
+    lock_scheduler();
+    process_t* rtn = &process_table[current_process];
+    unlock_scheduler();
+    return rtn;
+}
+
 void sleep(uint32_t ms) {
     if (ms == 0) return;
     lock_scheduler();