new file mode 100644
--- /dev/null
+++ b/src/os/unix/ngx_socket.c
@@ -0,0 +1,26 @@
+
+#include <ngx_socket.h>
+
+
+/* ioctl(FIONBIO) set blocking mode with one syscall only while
+   fcntl(F_SETFL, ~O_NONBLOCK) need to know previous state
+   using fcntl(F_GETFL).
+   On FreeBSD both are syscall */
+
+#ifdef __FreeBSD__
+
+int ngx_nonblocking(ngx_socket_t s)
+{
+    unsigned long  nb = 1;
+
+    return ioctl(s, FIONBIO, &nb);
+}
+
+int ngx_blocking(ngx_socket_t s)
+{
+    unsigned long  nb = 0;
+
+    return ioctl(s, FIONBIO, &nb);
+}
+
+#endif