created open syscall function

src/userprog/syscall.c

@@ -63,5 +63,31 @@ syscall_handler (struct intr_frame *f UNUSED)
       break;
     }
     */
+
+    case SYS_OPEN: { //calls at point=6
+  // Retrieve the actual file name argument from the user program's stack to be opened
+  // this line of code will not work if our team membre did not finish the stack code
+  const char* file_name = (const char*) get_user((const uint8_t*)f->esp + 4);
+
+  // Check if the file name pointer is valid and accessible
+  if (!file_name || !is_user_vaddr(file_name)) {
+    thread_exit(); // Terminate the thread if the pointer is invalid
+  }
+
+  // Open the file using the file system
+  struct file* file_obj = filesys_open(file_name);
+
+  // Check if the file opening was successful
+  if (!file_obj) {
+    f->eax = -1; // Return -1 to indicate failure
+  } else {
+   
+    int fd = process_add_file(file_obj);
+    // Return the file descriptor to the user program 
+    f->eax = fd;
+  }
+
+  break;
+}
   thread_exit ();
 }