Add EPOLL_CTL defines and normalize epoll_event with other systems

Author: jackpot51

src/unix/redox/mod.rs

@@ -64,7 +64,7 @@ s! {
 
     pub struct epoll_event {
         pub events: u32,
-        pub data: u64,
+        pub u64: u64,
         _pad: u64,
     }
 
@@ -406,6 +406,9 @@ extern {
 
 // sys/epoll.h
 pub const EPOLL_CLOEXEC: ::c_int = 0x0100_0000;
+pub const EPOLL_CTL_ADD: ::c_int = 1;
+pub const EPOLL_CTL_DEL: ::c_int = 2;
+pub const EPOLL_CTL_MOD: ::c_int = 3;
 pub const EPOLLIN: ::c_int = 1;
 pub const EPOLLPRI: ::c_int = 0;
 pub const EPOLLOUT: ::c_int = 2;