From ccfafe4a04e454b9952766c2f670b19cdcad765a Mon Sep 17 00:00:00 2001
From: Mathieu Maret <mathieu.maret@gmail.com>
Date: Wed, 7 Feb 2024 23:17:55 +0100
Subject: [PATCH] userspace: mmap test read and write

---
 userspace/main_user.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/userspace/main_user.c b/userspace/main_user.c
index cfdc52c..9502c75 100644
--- a/userspace/main_user.c
+++ b/userspace/main_user.c
@@ -56,11 +56,13 @@ int func_alloc()
         return 0;
 }
 
-int func_mmap()
-{
+int func_mmap() {
 
-        char *path ="/dev/zero";
-        mmap(0, 4096, 0, 0, path);
+        char *path    = "/dev/zero";
+        void *mapAddr = mmap((void *)4096, 4096, PROT_READ | PROT_WRITE, 0, path);
+        printf("Zero mmaped at %p\n", mapAddr);
+        int data        = *(int *)mapAddr;
+        *(int *)mapAddr = data;
 
         return 0;
 }