--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/src/unix/darwin-syscalls.h	Mon Jan 19 18:59:10 2026 -0800
@@ -0,0 +1,17 @@
+#ifndef UV_DARWIN_SYSCALLS_H_
+#define UV_DARWIN_SYSCALLS_H_
+
+#include <sys/types.h>
+#include <sys/socket.h>
+
+/* https://github.com/apple/darwin-xnu/blob/master/bsd/sys/socket.h */
+
+struct mmsghdr {
+    struct msghdr msg_hdr;
+    size_t msg_len;
+};
+
+ssize_t recvmsg_x(int s, const struct mmsghdr* msgp, u_int cnt, int flags);
+ssize_t sendmsg_x(int s, const struct mmsghdr* msgp, u_int cnt, int flags);
+
+#endif /* UV_DARWIN_SYSCALLS_H_ */