🆕 lseek系统调用

kernel/common/stdio.h

@@ -0,0 +1,7 @@
+#pragma once
+
+#define	SEEK_SET	0	/* Seek relative to start-of-file */
+#define	SEEK_CUR	1	/* Seek relative to current position */
+#define	SEEK_END	2	/* Seek relative to end-of-file */
+
+#define SEEK_MAX	3