From 548f7b19415640ad44502ef9ccb42c98bd92b6d1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gustav=20S=C3=B6rn=C3=A4s?= <gustav@sornas.net>
Date: Sun, 14 Mar 2021 14:48:08 +0100
Subject: create empty lab 6 syscalls

---
 src/userprog/syscall.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 53 insertions(+), 1 deletion(-)

(limited to 'src/userprog/syscall.c')

diff --git a/src/userprog/syscall.c b/src/userprog/syscall.c
index ea55cbe..8bdb42b 100644
--- a/src/userprog/syscall.c
+++ b/src/userprog/syscall.c
@@ -35,6 +35,12 @@ create (const char *filename, off_t initial_size)
   return filesys_create (filename, initial_size);
 }
 
+static bool
+remove (const char *filename)
+{
+  return false;
+}
+
 static int
 open (const char *filename)
 {
@@ -60,6 +66,12 @@ open (const char *filename)
   return -1;
 }
 
+static int
+filesize (int fd_i)
+{
+  return 0;
+}
+
 static struct file **
 get_fd (struct thread *thread, int fd_i)
 {
@@ -146,6 +158,19 @@ write (int fd_i, const void *buf, unsigned size)
   }
 }
 
+static void
+seek (int fd_i, unsigned position)
+{
+  return;
+}
+
+static unsigned
+tell (int fd_i)
+{
+  return 0;
+}
+
+
 static void
 close (int fd_i)
 {
@@ -203,7 +228,7 @@ syscall_handler (struct intr_frame *f UNUSED)
   int *status, *fd_i;
   off_t *initial_size;
   tid_t *child_tid;
-  unsigned *size;
+  unsigned *size, *position;
   void **buf;
 
   switch (*syscall_number) {
@@ -239,6 +264,13 @@ syscall_handler (struct intr_frame *f UNUSED)
       CHECK_PTR_AND_MAYBE_EXIT (initial_size);
       f->eax = create (*filename, *initial_size);
       break;
+    case 5:
+      // remove
+      filename = INTR_ESP (1, char *);
+      CHECK_PTR_AND_MAYBE_EXIT (filename);
+      CHECK_PTR_AND_MAYBE_EXIT (*filename);
+      f->eax = remove (*filename);
+      break;
     case 6:
       // open
       filename = INTR_ESP (1, char *);
@@ -246,6 +278,12 @@ syscall_handler (struct intr_frame *f UNUSED)
       CHECK_PTR_AND_MAYBE_EXIT (*filename);
       f->eax = open (*filename);
       break;
+    case 7:
+      // filesize
+      fd_i = INTR_ESP (1, int);
+      CHECK_PTR_AND_MAYBE_EXIT (fd_i);
+      f->eax = filesize (*fd_i);
+      break;
     case 8:
       // read
       fd_i = INTR_ESP (1, int);
@@ -270,6 +308,20 @@ syscall_handler (struct intr_frame *f UNUSED)
       CHECK_PTR_AND_MAYBE_EXIT (*buf + *size);
       f->eax = write (*fd_i, *buf, *size);
       break;
+    case 10:
+      // seek
+      fd_i = INTR_ESP (1, int);
+      position = INTR_ESP (3, unsigned);
+      CHECK_PTR_AND_MAYBE_EXIT (fd_i);
+      CHECK_PTR_AND_MAYBE_EXIT (position);
+      seek (*fd_i, *position);
+      break;
+    case 11:
+      // tell
+      fd_i = INTR_ESP (1, int);
+      CHECK_PTR_AND_MAYBE_EXIT (fd_i);
+      f->eax = tell (*fd_i);
+      break;
     case 12:
       // close
       fd_i = INTR_ESP (1, int);
-- 
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