Update doc.

Author: moteus

doc/lcurl.ldoc

@@ -24,6 +24,13 @@ function easy() end
 --
 -- @tparam[opt] table options
 -- @treturn[1] multi new curl multi object
+--
+-- @usage
+-- m = curl.multi{
+-- socketfunction = handle_socket;
+-- timerfunction = start_timeout;
+-- }
+--
 function multi() end
 
 --- Create Share object
@@ -433,6 +440,18 @@ function info_read() end
 -- c:setopt{maxconnects = 10}
 function setopt() end
 
+--- Perform socket action.
+--
+-- @tparam[opt=curl.SOCKET_TIMEOUT] number socket
+-- @tparam[opt=0] number mask
+-- @treturn multi self
+--
+-- @usage
+-- c:socket_action()
+-- c:socket_action(sock_fd, curl.CSELECT_IN)
+-- c:socket_action(sock_fd, curl.CSELECT_OUT)
+function socket_action() end
+
 --- Set timer callback.
 --
 -- @tparam function timer timer callback

src/lcmulti.c

@@ -231,7 +231,7 @@ static int lcurl_multi_socket_action(lua_State *L){
  lcurl_multi_t *p = lcurl_getmulti(L);
  curl_socket_t s = lutil_optint64(L, 2, CURL_SOCKET_TIMEOUT);
  CURLMcode code; int n, mask;
- if(s == CURL_SOCKET_TIMEOUT) mask = 0;
+ if(s == CURL_SOCKET_TIMEOUT) mask = lutil_optint64(L, 3, 0);
  else mask = lutil_checkint64(L, 3);
  code = curl_multi_socket_action(p->curl, s, mask, &n);
  if(code != CURLM_OK){