--- a/src/os/unix/ngx_socket.h
+++ b/src/os/unix/ngx_socket.h
@@ -4,6 +4,11 @@
 
 #include <ngx_config.h>
 
+#ifdef __FreeBSD__
+#include <sys/ioctl.h>
+#endif
+
+
 #define NGX_WRITE_SHUTDOWN SHUT_WR
 
 typedef int  ngx_socket_t;
@@ -11,9 +16,23 @@ typedef int  ngx_socket_t;
 #define ngx_socket(af, type, proto, flags)   socket(af, type, proto)
 #define ngx_socket_n        "socket()"
 
+
+#ifdef __FreeBSD__
+
+int ngx_nonblocking(ngx_socket_t s);
+int ngx_blocking(ngx_socket_t s);
+
+#define ngx_nonblocking_n   "ioctl(FIONBIO)"
+#define ngx_blocking_n      "ioctl(!FIONBIO)"
+
+#else
+
 #define ngx_nonblocking(s)  fcntl(s, F_SETFL, O_NONBLOCK)
 #define ngx_nonblocking_n   "fcntl(O_NONBLOCK)"
 
+#endif
+
+
 #define ngx_shutdown_socket    shutdown
 #define ngx_shutdown_socket_n  "shutdown()"