Fix windows.

tests/event/main.rs

@@ -12,3 +12,32 @@ mod eventfd;
 mod poll;
 #[cfg(any(bsd, linux_kernel, windows, target_os = "wasi"))]
 mod select;
+
+#[cfg(windows)]
+mod windows {
+    use std::sync::OnceLock;
+
+    pub struct Thing;
+
+    impl Thing {
+        pub fn new() -> Self {
+            let _ = rustix::net::wsa_startup().unwrap();
+            Self
+        }
+    }
+
+    impl Drop for Thing {
+        fn drop(&mut self) {
+            rustix::net::wsa_cleanup().unwrap();
+        }
+    }
+
+    pub static CLEANUP: OnceLock<Thing> = OnceLock::new();
+}
+
+/// Checks whether the Windows socket interface has been started already, and
+/// if not, starts it.
+pub fn init() {
+    #[cfg(windows)]
+    let _ = windows::CLEANUP.get_or_init(|| windows::Thing::new());
+}

tests/event/select.rs

@@ -182,6 +182,8 @@ fn test_select_with_sockets() {
     use rustix::net::{recv, send, AddressFamily, RecvFlags, SendFlags, SocketType};
     use std::net::{IpAddr, Ipv4Addr, SocketAddr};
 
+    crate::init();
+
     // Create a socket pair (but don't use `socketpair` because we want this
     // to work on Windows too).
 
@@ -277,6 +279,8 @@ fn test_select_with_maxfd_sockets() {
     use rustix::process::{getrlimit, setrlimit, Resource};
     use std::net::{IpAddr, Ipv4Addr, SocketAddr};
 
+    crate::init();
+
     let localhost = IpAddr::V4(Ipv4Addr::LOCALHOST);
     let addr = SocketAddr::new(localhost, 0);
     let listener = rustix::net::socket(AddressFamily::INET, SocketType::STREAM, None).unwrap();