freebsd: use accept4, introduced in version 10

src/unix/core.c

@@ -61,6 +61,12 @@
 # include <sys/wait.h>
 #endif
 
+#if __FreeBSD__ >= 10
+# define uv__accept4 accept4
+# define UV__SOCK_NONBLOCK SOCK_NONBLOCK
+# define UV__SOCK_CLOEXEC  SOCK_CLOEXEC
+#endif
+
 static void uv__run_pending(uv_loop_t* loop);
 
 /* Verify that uv_buf_t is ABI-compatible with struct iovec. */
@@ -371,7 +377,7 @@ int uv__accept(int sockfd) {
   assert(sockfd >= 0);
 
   while (1) {
-#if defined(__linux__)
+#if defined(__linux__) || __FreeBSD__ >= 10
     static int no_accept4;
 
     if (no_accept4)