From 8556c8e070c5a8476f1a5131538604e22580a9ef Mon Sep 17 00:00:00 2001
From: CCXXXI <ccxxxi@qq.com>
Date: Mon, 11 Jan 2021 00:10:50 +0800
Subject: [PATCH] syscall seek

---
 src/userprog/syscall.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/userprog/syscall.c b/src/userprog/syscall.c
index f011830..fc8257c 100644
--- a/src/userprog/syscall.c
+++ b/src/userprog/syscall.c
@@ -457,7 +457,13 @@ static int read(int fd, void *buffer, unsigned size)
     system and do not require any special effort in system call implementation. */
 static void seek(int fd, unsigned position)
 {
-    // todo
+    struct open_file *f = get_file_by_fd(fd);
+
+    USER_ASSERT(f != NULL);
+
+    lock_acquire(&file_lock);
+    file_seek(f->file, position);
+    lock_release(&file_lock);
 }
 
 /* Returns the position of the next byte to be read or written in open