unix socket: Add setsockopt() method.

unix/socket.c

@@ -162,6 +162,29 @@ static mp_obj_t socket_send(uint n_args, const mp_obj_t *args) {
 }
 static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(socket_send_obj, 2, 3, socket_send);
 
+static mp_obj_t socket_setsockopt(uint n_args, const mp_obj_t *args) {
+    mp_obj_socket_t *self = args[0];
+    int level = MP_OBJ_SMALL_INT_VALUE(args[1]);
+    int option = mp_obj_get_int(args[2]);
+
+    const void *optval;
+    socklen_t optlen;
+    if (MP_OBJ_IS_INT(args[3])) {
+        int val = mp_obj_int_get(args[3]);
+        optval = &val;
+        optlen = sizeof(val);
+    } else {
+        buffer_info_t bufinfo;
+        get_buffer(args[3], &bufinfo);
+        optval = bufinfo.buf;
+        optlen = bufinfo.len;
+    }
+    int r = setsockopt(self->fd, level, option, optval, optlen);
+    RAISE_ERRNO(r, errno);
+    return mp_const_none;
+}
+static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(socket_setsockopt_obj, 4, 4, socket_setsockopt);
+
 static mp_obj_t socket_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args) {
     int family = AF_INET;
     int type = SOCK_STREAM;
@@ -196,6 +219,7 @@ static const mp_method_t rawsocket_type_methods[] = {
         { "accept", &socket_accept_obj },
         { "recv", &socket_recv_obj },
         { "send", &socket_send_obj },
+        { "setsockopt", &socket_setsockopt_obj },
         { "close", &socket_close_obj },
 #if MICROPY_SOCKET_EXTRA
         { "recv", &mp_stream_read_obj },