NAME

       curl_multi_timeout - how long to wait for action before proceeding

SYNOPSIS

       #include <curl/curl.h>

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

DESCRIPTION

       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 are 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 moment. If 0, it means you should proceed immediately without waiting  for  anything.
       If it returns -1, there is no timeout at all set.

       An  application  that  uses  the multi_socket API should not use this function.  It should
       instead use the CURLMOPT_TIMERFUNCTION(3) 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(3) again.

PROTOCOLS

       This functionality affects all supported protocols

EXAMPLE

       int main(void)
       {
         struct timeval timeout;
         long timeo;
         fd_set fdread;
         fd_set fdwrite;
         fd_set fdexcep;
         int maxfd;
         CURLM *multi = curl_multi_init();

         curl_multi_timeout(multi, &timeo);
         if(timeo < 0)
           /* no set timeout, use a default */
           timeo = 980;

         timeout.tv_sec = timeo / 1000;
         timeout.tv_usec = (timeo % 1000) * 1000;

         /* wait for activities no longer than the set timeout */
         select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
       }

TYPICAL USAGE

       Call curl_multi_timeout(3), then wait for action on the sockets. Figure out which  sockets
       to wait for by calling curl_multi_fdset(3).

       When  there  is  activity or timeout, call curl_multi_perform(3) and then loop - until all
       transfers are complete.

AVAILABILITY

       Added in curl 7.15.4

RETURN VALUE

       The standard CURLMcode for multi interface error codes.

SEE ALSO

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