From 7c88e2cf4b68cbb4ffd86b848a3265cea9419c14 Mon Sep 17 00:00:00 2001
From: y2-binyahya <yasser2.binyahya@live.uwe.ac.uk>
Date: Sun, 9 Jul 2023 17:06:02 +0000
Subject: [PATCH] created open syscall function
---
src/userprog/syscall.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/src/userprog/syscall.c b/src/userprog/syscall.c
index 1e17a78..7980ce5 100644
--- a/src/userprog/syscall.c
+++ b/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 ();
}
--
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