std::net: TcpListener shrinks the backlog argument to 32 for Haiku.

library/std/src/sys_common/net.rs

@@ -417,6 +417,10 @@ impl TcpListener {
                 // it allows up to about 37, but other times it doesn't even
                 // accept 32. There may be a global limitation causing this.
                 let backlog = 20;
+            } else if #[cfg(target_os = "haiku")] {
+                // Haiku does not support a queue length > 32
+                // https://github.com/haiku/haiku/blob/979a0bc487864675517fb2fab28f87dc8bf43041/headers/posix/sys/socket.h#L81
+                let backlog = 32;
             } else {
                 // The default for all other platforms
                 let backlog = 128;