add stub for read

kernel/syscall/stub.h

@@ -8,6 +8,7 @@ namespace Syscall {
 enum class ID : size_t {
 	TEST = 0,
 	WRITE = 1,
+	READ = 2,
 };
 }  // namespace Syscall
 
@@ -27,3 +28,7 @@ extern "C" ssize_t sys_safe_call(Syscall::ID id, size_t p1, size_t p2,
 [[gnu::always_inline]] static inline int write(int fd, const void *buf, size_t len, int x = -1, int y = -1) {
 	return sys_call(Syscall::ID::WRITE, fd, (size_t)buf, len, x, y);
 }
+
+[[gnu::always_inline]] static inline int read(int fd, void *buf, size_t len){
+	return sys_call(Syscall::ID::READ, fd, (size_t)buf, len, 0, 0);
+}