From 87d72418338a9250f70cb4a43c8bea10371f8256 Mon Sep 17 00:00:00 2001
From: Thomas de Zeeuw <thomasdezeeuw@gmail.com>
Date: Fri, 17 May 2019 11:52:42 +0200
Subject: [PATCH] Fix kqueue on platforms where C's long is i32

---
 src/sys/unix/kqueue.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/sys/unix/kqueue.rs b/src/sys/unix/kqueue.rs
index 8269e3207..d64689fe9 100644
--- a/src/sys/unix/kqueue.rs
+++ b/src/sys/unix/kqueue.rs
@@ -74,7 +74,11 @@ impl Selector {
     ) -> io::Result<bool> {
         let timeout = timeout.map(|to| libc::timespec {
             tv_sec: cmp::min(to.as_secs(), time_t::max_value() as u64) as time_t,
-            tv_nsec: libc::c_long::from(to.subsec_nanos()),
+            // `Duration::subsec_nanos` is guaranteed to be less than one
+            // billion (the number of nanoseconds in a second), making the
+            // cast to i32 safe. The cast itself is needed for platforms
+            // where C's long is only 32 bits.
+            tv_nsec: libc::c_long::from(to.subsec_nanos() as i32),
         });
         let timeout = timeout
             .as_ref()