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curl_multi_timeout(3)           libcurl Manual           curl_multi_timeout(3)

       curl_multi_timeout - how long to wait for action before proceeding

       #include <curl/curl.h>

       CURLMcode curl_multi_timeout(CURLM *multi_handle, long *timeout);

       An  application  using  the libcurl multi interface should call curl_multi_timeout(3) to figure out how long it
       should wait for socket actions - at most - before proceeding.

       Proceeding means either doing the socket-style timeout action: call  the  curl_multi_socket_action(3)  function
       with  the sockfd argument set to CURL_SOCKET_TIMEOUT, or call curl_multi_perform(3) if you're using the simpler
       and older multi interface approach.

       The timeout value returned in the long timeout points to, is in number of milliseconds at this very moment.  If
       0,  it  means you should proceed immediately without waiting for anything. If it returns -1, there's no timeout
       at all set.

       An application that  uses  the  multi_socket  API  SHOULD  not  use  this  function,  but  SHOULD  instead  use
       curl_multi_setopt(3) and its CURLMOPT_TIMERFUNCTION option for proper and desired behavior.

       Note:  if  libcurl returns a -1 timeout here, it just means that libcurl currently has no stored timeout value.
       You must not wait too long (more than a few seconds perhaps) before you call curl_multi_perform() again.

       The standard CURLMcode for multi interface error codes.

       Call curl_multi_timeout(3), then wait for action on the sockets. You figure out which sockets to  wait  for  by
       calling curl_multi_fdset(3) or by a previous call to curl_multi_socket(3).

       This function was added in libcurl 7.15.4.

       curl_multi_fdset(3), curl_multi_info_read(3), curl_multi_socket(3), curl_multi_setopt(3)

libcurl 7.16.0                    2 Jan 2006             curl_multi_timeout(3)