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Diffstat (limited to 'docs/libcurl/opts/CURLOPT_DNS_CACHE_TIMEOUT.3')
| -rw-r--r-- | docs/libcurl/opts/CURLOPT_DNS_CACHE_TIMEOUT.3 | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/docs/libcurl/opts/CURLOPT_DNS_CACHE_TIMEOUT.3 b/docs/libcurl/opts/CURLOPT_DNS_CACHE_TIMEOUT.3 new file mode 100644 index 000000000..93327806c --- /dev/null +++ b/docs/libcurl/opts/CURLOPT_DNS_CACHE_TIMEOUT.3 @@ -0,0 +1,56 @@ +.\" ************************************************************************** +.\" * _ _ ____ _ +.\" * Project ___| | | | _ \| | +.\" * / __| | | | |_) | | +.\" * | (__| |_| | _ <| |___ +.\" * \___|\___/|_| \_\_____| +.\" * +.\" * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al. +.\" * +.\" * This software is licensed as described in the file COPYING, which +.\" * you should have received as part of this distribution. The terms +.\" * are also available at http://curl.haxx.se/docs/copyright.html. +.\" * +.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell +.\" * copies of the Software, and permit persons to whom the Software is +.\" * furnished to do so, under the terms of the COPYING file. +.\" * +.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY +.\" * KIND, either express or implied. +.\" * +.\" ************************************************************************** +.\" +.TH CURLOPT_DNS_CACHE_TIMEOUT 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options" +.SH NAME +CURLOPT_DNS_CACHE_TIMEOUT \- set life-time for DNS cache entries +.SH SYNOPSIS +#include <curl/curl.h> + +CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_CACHE_TIMEOUT, long age); +.SH 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 completely 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 +\fIres_init(3)\fP). 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. +.SH DEFAULT +60 +.SH PROTOCOLS +All +.SH EXAMPLE +TODO +.SH AVAILABILITY +Always +.SH RETURN VALUE +Returns CURLE_OK +.SH "SEE ALSO" +.BR CURLOPT_DNS_USE_GLOBAL_CACHE "(3), " CURLOPT_DNS_SERVERS "(3), " |