sort: fix test_tmp_files_deleted_on_sigint, wait for signal handling at

the end of the program

src/uu/sort/src/sort.rs

@@ -1267,7 +1267,9 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
 
     settings.init_precomputed();
 
-    exec(&mut files, &settings, output, &mut tmp_dir)
+    let result = exec(&mut files, &settings, output, &mut tmp_dir);
+    tmp_dir.wait_if_signal();
+    result
 }
 
 pub fn uu_app<'a>() -> Command<'a> {

src/uu/sort/src/tmp_dir.rs

@@ -69,6 +69,10 @@ impl TmpDirWrapper {
             path,
         ))
     }
+
+    pub fn wait_if_signal(&self) {
+        let _ = self.lock.lock().unwrap();
+    }
 }
 
 /// Remove the directory at `path` by deleting its child files and then itself.