CURLOPT_DNS_CACHE_TIMEOUT(3curl_easy_setopt optionCURLOPT_DNS_CACHE_TIMEOUT(3)NAMECURLOPT_DNS_CACHE_TIMEOUT - set life-time for DNS cache entries
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_CACHE_TIMEOUT, long
age);
DESCRIPTION
Pass a long, this sets the timeout in seconds. Name resolves will be
kept in memory and used for this number of seconds. Set to zero to com‐
pletely disable caching, or set to -1 to make the cached entries remain
forever. By default, libcurl caches this info for 60 seconds.
The name resolve functions of various libc implementations don't re-
read name server information unless explicitly told so (for example, by
calling res_init(3)). This may cause libcurl to keep using the older
server even if DHCP has updated the server info, and this may look like
a DNS cache issue to the casual libcurl-app user.
Note that DNS entries have a "TTL" property but libcurl doesn't use
that. This DNS cache timeout is entirely speculative that a name will
resolve to the same address for a certain small amount of time into the
future.
DEFAULT
60
PROTOCOLS
All
EXAMPLE
TODO
AVAILABILITY
Always
RETURN VALUE
Returns CURLE_OK
SEE ALSOCURLOPT_DNS_USE_GLOBAL_CACHE(3), CURLOPT_DNS_SERVERS(3),
libcurl 7.37.0 17 Jun 2014 CURLOPT_DNS_CACHE_TIMEOUT(3)
