From 680124933e519458ac5063c6026293d1695b0a09 Mon Sep 17 00:00:00 2001
From: weitengchen <weitengchen@microsoft.com>
Date: Tue, 23 Sep 2025 12:51:09 -0700
Subject: [PATCH] ignore MAP_SHARED

---
 litebox_shim_linux/src/syscalls/mm.rs | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/litebox_shim_linux/src/syscalls/mm.rs b/litebox_shim_linux/src/syscalls/mm.rs
index 03a12e502..02bb21f90 100644
--- a/litebox_shim_linux/src/syscalls/mm.rs
+++ b/litebox_shim_linux/src/syscalls/mm.rs
@@ -114,8 +114,7 @@ pub(crate) fn sys_mmap(
         return Err(Errno::EINVAL);
     }
     if flags.intersects(
-        MapFlags::MAP_SHARED
-            | MapFlags::MAP_32BIT
+        MapFlags::MAP_32BIT
             | MapFlags::MAP_GROWSDOWN
             | MapFlags::MAP_LOCKED
             | MapFlags::MAP_NONBLOCK
@@ -128,6 +127,15 @@ pub(crate) fn sys_mmap(
         todo!("Unsupported flags {:?}", flags);
     }
 
+    if flags.contains(MapFlags::MAP_SHARED) {
+        #[cfg(debug_assertions)]
+        litebox::log_println!(
+            litebox_platform_multiplex::platform(),
+            "Warning: MAP_SHARED is not fully supported yet, changes are not reflected to the underlying file.",
+        );
+    }
+    let flags = flags - MapFlags::MAP_SHARED;
+
     let aligned_len = align_up(len, PAGE_SIZE);
     if aligned_len == 0 {
         return Err(Errno::ENOMEM);