ntdll: Implement NtOpenMutant().

dlls/ntdll/unix/esync.c

@@ -479,6 +479,14 @@ NTSTATUS esync_create_mutex( HANDLE *handle, ACCESS_MASK access,
     return create_esync( ESYNC_MUTEX, handle, access, attr, initial ? 0 : 1, 0 );
 }
 
+NTSTATUS esync_open_mutex( HANDLE *handle, ACCESS_MASK access,
+    const OBJECT_ATTRIBUTES *attr )
+{
+    TRACE("name %s.\n", debugstr_us(attr->ObjectName));
+
+    return open_esync( ESYNC_MUTEX, handle, access, attr );
+}
+
 NTSTATUS esync_release_mutex( HANDLE *handle, LONG *prev )
 {
     struct esync *obj;

dlls/ntdll/unix/esync.h

@@ -37,6 +37,8 @@ extern NTSTATUS esync_set_event( HANDLE handle ) DECLSPEC_HIDDEN;
 
 extern NTSTATUS esync_create_mutex( HANDLE *handle, ACCESS_MASK access,
     const OBJECT_ATTRIBUTES *attr, BOOLEAN initial ) DECLSPEC_HIDDEN;
+extern NTSTATUS esync_open_mutex( HANDLE *handle, ACCESS_MASK access,
+    const OBJECT_ATTRIBUTES *attr ) DECLSPEC_HIDDEN;
 extern NTSTATUS esync_release_mutex( HANDLE *handle, LONG *prev ) DECLSPEC_HIDDEN;
 
 extern NTSTATUS esync_wait_objects( DWORD count, const HANDLE *handles, BOOLEAN wait_any,

dlls/ntdll/unix/sync.c

@@ -594,6 +594,9 @@ NTSTATUS WINAPI NtOpenMutant( HANDLE *handle, ACCESS_MASK access, const OBJECT_A
     *handle = 0;
     if ((ret = validate_open_object_attributes( attr ))) return ret;
 
+    if (do_esync())
+        return esync_open_mutex( handle, access, attr );
+
     SERVER_START_REQ( open_mutex )
     {
         req->access  = access;