Add Windows impl

sqlx-pool-guard/src/linux.rs

@@ -0,0 +1,34 @@
+// Copyright 2025 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+static PROC_SELF_FD_DIR: &str = "/proc/self/fd/";
+
+/// Check if there are no open file descriptors for the given files.
+///
+/// Linux, Android: uses `/proc/self/fd/` to list open file descriptors
+/// See: https://stackoverflow.com/a/59797198/351305
+pub async fn check_files_closed(file_paths: &[&Path]) -> io::Result<bool> {
+    let mut dir = tokio::fs::read_dir(PROC_SELF_FD_DIR).await?;
+
+    while let Ok(Some(entry)) = dir.next_entry().await {
+        if entry
+            .file_type()
+            .await
+            .inspect_err(|e| log::warn!("entry.file_type() failure: {e}"))
+            .is_ok_and(|entry_type| entry_type.is_symlink())
+        {
+            match tokio::fs::read_link(entry.path()).await {
+                Ok(resolved_path) => {
+                    if file_paths.contains(&resolved_path.as_ref()) {
+                        return Ok(false);
+                    }
+                }
+                Err(e) => {
+                    log::error!("Failed to read symlink: {e}");
+                }
+            }
+        }
+    }
+
+    Ok(true)
+}