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curl_multi_timeout

Section: libcurl Manual (3)
Updated: 2 Jan 2006
Index Return to Main Contents
 

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)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
TYPICAL USAGE
AVAILABILITY
SEE ALSO


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