개요

• 솔라나라에 설명된 어플리케이션에 대해 맨 페이지를 찾아 출력한다.
• MAN 페이지에 대한 설명은 윈디하나의 솔라나라: MAN 페이지을 참고하자.
• svcadm(1M)을 검색하려면 섹션에서 1M 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.

CURLOPT_DNS_CACHE_TIMEOUT(3)

curl_easy_setopt options                          CURLOPT_DNS_CACHE_TIMEOUT(3)



NAME
       CURLOPT_DNS_CACHE_TIMEOUT - 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 do  not  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  does  not  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
       CURL *curl = curl_easy_init();
       if(curl) {
         curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");

         /* only reuse addresses for a short time */
         curl_easy_setopt(curl, CURLOPT_DNS_CACHE_TIMEOUT, 2L);

         ret = curl_easy_perform(curl);

         /* in this second request, the cache will not be used if more than
            two seconds have passed since the previous name resolve */
         ret = curl_easy_perform(curl);

         curl_easy_cleanup(curl);
       }

AVAILABILITY
       Always

RETURN VALUE
       Returns CURLE_OK

SEE ALSO
       CURLOPT_DNS_USE_GLOBAL_CACHE(3),      CURLOPT_DNS_SERVERS(3),      CUR‐
       LOPT_RESOLVE(3),



libcurl 7.86.0                   May 17, 2022
                                                  CURLOPT_DNS_CACHE_TIMEOUT(3)