1 files changed, 23 insertions, 0 deletions
diff --git a/test/test_resource.rs b/test/test_resource.rs
new file mode 100644
index 00000000..59697500
--- /dev/null
+++ b/test/test_resource.rs
@@ -0,0 +1,23 @@
+#[cfg(not(any(target_os = "redox", target_os = "fuchsia", target_os = "illumos")))]
+use nix::sys::resource::{getrlimit, setrlimit, Resource};
+
+/// Tests the RLIMIT_NOFILE functionality of getrlimit(), where the resource RLIMIT_NOFILE refers
+/// to the maximum file descriptor number that can be opened by the process (aka the maximum number
+/// of file descriptors that the process can open, since Linux 4.5).
+///
+/// We first fetch the existing file descriptor maximum values using getrlimit(), then edit the
+/// soft limit to make sure it has a new and distinct value to the hard limit. We then setrlimit()
+/// to put the new soft limit in effect, and then getrlimit() once more to ensure the limits have
+/// been updated.
+#[test]
+#[cfg(not(any(target_os = "redox", target_os = "fuchsia", target_os = "illumos")))]
+pub fn test_resource_limits_nofile() {
+    let (soft_limit, hard_limit) = getrlimit(Resource::RLIMIT_NOFILE).unwrap();
+
+    let soft_limit = Some(soft_limit.map_or(1024, |v| v - 1));
+    assert_ne!(soft_limit, hard_limit);
+    setrlimit(Resource::RLIMIT_NOFILE, soft_limit, hard_limit).unwrap();
+
+    let (new_soft_limit, _) = getrlimit(Resource::RLIMIT_NOFILE).unwrap();
+    assert_eq!(new_soft_limit, soft_limit);
+}