Fb Curl Multi Fdset

:::info[Note] This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information. :::

extracts file descriptor information from a multi handle

function fb_curl_multi_fdset(
  resource $mh,
  inout array& $read_fd_set,
  inout array& $write_fd_set,
  inout array& $exc_fd_set,
  inout int& $max_fd,
): mixed;

Parameters

• resource $mh - A cURL multi handle returned by curl_multi_init().
• inout array& $read_fd_set - read set
• inout array& $write_fd_set - write set
• inout array& $exc_fd_set - exception set
• inout int& $max_fd - If no file descriptors are set, $max_fd will contain -1. Otherwise it will contain the higher descriptor number.

Returns

• mixed - - Returns 0 on success, or one of the CURLM_XXX errors code.