Paul Gofman : ntdll: Support MEM_REPLACE_PLACEHOLDER in map_view().

[Alexandre Julliard]

Module: wine
Branch: master
Commit: b7ea896fdbba5ea23ceec23b71626537d0091c0c
URL:    https://gitlab.winehq.org/wine/wine/-/commit/b7ea896fdbba5ea23ceec23b7162653...

Author: Paul Gofman 
Date:   Thu May 18 20:42:05 2023 -0600

ntdll: Support MEM_REPLACE_PLACEHOLDER in map_view().

---

dlls/ntdll/unix/virtual.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/dlls/ntdll/unix/virtual.c b/dlls/ntdll/unix/virtual.c
index 959ac67694f..6a6fce6436a 100644
--- a/dlls/ntdll/unix/virtual.c
+++ b/dlls/ntdll/unix/virtual.c
@@ -1980,6 +1980,23 @@ static NTSTATUS map_view( struct file_view **view_ret, void *base, size_t size,
     void *ptr;
     NTSTATUS status;

+    if (alloc_type & MEM_REPLACE_PLACEHOLDER)
+    {
+        struct file_view *view;
+
+        if (!(view = find_view( base, 0 ))) return STATUS_INVALID_PARAMETER;
+        if (view->base != base || view->size != size) return STATUS_CONFLICTING_ADDRESSES;
+        if (!(view->protect & VPROT_FREE_PLACEHOLDER)) return STATUS_INVALID_PARAMETER;
+
+        TRACE( "found view %p, size %p, protect %#x.\n", view->base, (void *)view->size, view->protect );
+
+        view->protect = vprot | VPROT_PLACEHOLDER;
+        set_vprot( view, base, size, vprot );
+        if (vprot & VPROT_WRITEWATCH) reset_write_watches( base, size );
+        *view_ret = view;
+        return STATUS_SUCCESS;
+    }
+
     if (base)
     {
         if (is_beyond_limit( base, size, address_space_limit ))