Fix AsyncFd::listen

Forgotten to commit this in the previous commit.

Fixes: 907141c

Author: Thomasdezeeuw

src/io_uring/net.rs

@@ -80,7 +80,7 @@ pub(crate) struct ListenOp;
 impl FdOp for ListenOp {
     type Output = ();
     type Resources = ();
-    type Args = libc::c_int; // backlog.
+    type Args = u32; // backlog.
 
     #[allow(clippy::cast_sign_loss)]
     fn fill_submission(
@@ -91,7 +91,7 @@ impl FdOp for ListenOp {
     ) {
         submission.0.opcode = libc::IORING_OP_LISTEN as u8;
         submission.0.fd = fd.fd();
-        submission.0.len = *backlog as u32;
+        submission.0.len = *backlog;
     }
 
     fn map_ok(_: &AsyncFd, (): Self::Resources, (_, n): OpReturn) -> Self::Output {

src/kqueue/net.rs

@@ -95,10 +95,10 @@ pub(crate) struct ListenOp;
 impl DirectFdOp for ListenOp {
     type Output = ();
     type Resources = ();
-    type Args = libc::c_int; // backlog.
+    type Args = u32; // backlog.
 
     fn run(fd: &AsyncFd, (): Self::Resources, backlog: Self::Args) -> io::Result<Self::Output> {
-        syscall!(listen(fd.fd(), backlog))?;
+        syscall!(listen(fd.fd(), backlog.cast_signed()))?;
         Ok(())
     }
 }

tests/util/mod.rs

@@ -474,7 +474,7 @@ pub(crate) async fn bind_and_listen_ipv4(socket: &AsyncFd) -> SocketAddr {
         Err(ref err) if is_unsupported(err) => {
             // IORING_OP_LISTEN is only available since 6.11, fall back to a
             // blocking system call.
-            syscall!(listen(fd, backlog)).map(|_| ())
+            syscall!(listen(fd, backlog.cast_signed())).map(|_| ())
         }
         Err(err) => Err(err),
     }