1 files changed, 69 insertions, 0 deletions
diff --git a/third_party/rust/nix/test/sys/test_timerfd.rs b/third_party/rust/nix/test/sys/test_timerfd.rs
new file mode 100644
index 0000000000..08e292106c
--- /dev/null
+++ b/third_party/rust/nix/test/sys/test_timerfd.rs
@@ -0,0 +1,69 @@
+use nix::sys::time::{TimeSpec, TimeValLike};
+use nix::sys::timerfd::{
+    ClockId, Expiration, TimerFd, TimerFlags, TimerSetTimeFlags,
+};
+use std::time::Instant;
+
+#[test]
+pub fn test_timerfd_oneshot() {
+    let timer =
+        TimerFd::new(ClockId::CLOCK_MONOTONIC, TimerFlags::empty()).unwrap();
+
+    let before = Instant::now();
+
+    timer
+        .set(
+            Expiration::OneShot(TimeSpec::seconds(1)),
+            TimerSetTimeFlags::empty(),
+        )
+        .unwrap();
+
+    timer.wait().unwrap();
+
+    let millis = before.elapsed().as_millis();
+    assert!(millis > 900);
+}
+
+#[test]
+pub fn test_timerfd_interval() {
+    let timer =
+        TimerFd::new(ClockId::CLOCK_MONOTONIC, TimerFlags::empty()).unwrap();
+
+    let before = Instant::now();
+    timer
+        .set(
+            Expiration::IntervalDelayed(
+                TimeSpec::seconds(1),
+                TimeSpec::seconds(2),
+            ),
+            TimerSetTimeFlags::empty(),
+        )
+        .unwrap();
+
+    timer.wait().unwrap();
+
+    let start_delay = before.elapsed().as_millis();
+    assert!(start_delay > 900);
+
+    timer.wait().unwrap();
+
+    let interval_delay = before.elapsed().as_millis();
+    assert!(interval_delay > 2900);
+}
+
+#[test]
+pub fn test_timerfd_unset() {
+    let timer =
+        TimerFd::new(ClockId::CLOCK_MONOTONIC, TimerFlags::empty()).unwrap();
+
+    timer
+        .set(
+            Expiration::OneShot(TimeSpec::seconds(1)),
+            TimerSetTimeFlags::empty(),
+        )
+        .unwrap();
+
+    timer.unset().unwrap();
+
+    assert!(timer.get().unwrap().is_none());
+}