feat: add function to get fd of memfd

src/bump_allocator.rs

@@ -91,6 +91,10 @@ impl BumpAllocator {
 
         offset as usize
     }
+
+    pub(crate) fn get_fd(&self) -> i32 {
+        self.backing_fd
+    }
 }
 
 #[cfg(test)]

src/lib.rs

@@ -1,6 +1,14 @@
 #![feature(test)]
 #![feature(lazy_cell)]
 
+use bump_allocator::BUMP_ALLOCATOR;
+
 mod allocator;
 mod bump_allocator;
 pub mod sharedptr;
+
+pub fn get_shared_mem_fd() -> i32 {
+    let allocator = BUMP_ALLOCATOR.lock().unwrap();
+
+    allocator.get_fd()
+}