Merge pull request rust-lang#4014 from tgross35/backport-swiss-chard

[0.2] Backports

Author: tgross35

libc-test/build.rs

@@ -4260,6 +4260,10 @@ fn test_linux(target: &str) {
             // FIXME: Requires >= 6.11 kernel headers.
             "MAP_DROPPABLE" => true,
 
+            // FIXME: Requires >= 6.9 kernel headers.
+            "EPIOCSPARAMS"
+            | "EPIOCGPARAMS" => true,
+
             _ => false,
         }
     });

src/unix/linux_like/linux/mod.rs

@@ -1486,6 +1486,15 @@ cfg_if! {
             }
         }
     }
+
+    // #include <linux/eventpoll.h>
+
+    pub struct epoll_params {
+        pub busy_poll_usecs: u32,
+        pub busy_poll_budget: u16,
+        pub prefer_busy_poll: u8,
+        pub __pad: u8, // Must be zero
+    }
 }
 
 s_no_extra_traits! {