Provided by:
libcurl4-openssl-dev_7.21.3-1ubuntu1_i386 
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'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.
RETURN VALUE
The standard CURLMcode for multi interface error codes.
TYPICAL USAGE
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).
AVAILABILITY
This function was added in libcurl 7.15.4.
SEE ALSO
curl_multi_fdset(3), curl_multi_info_read(3), curl_multi_socket(3),
curl_multi_setopt(3)