OpenGrok

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CURLOPT_TCP_KEEPINTVL - set TCP keep-alive interval #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_KEEPINTVL, long interval); Pass a long. Sets the interval, in seconds, that the operating system will wait between sending keepalive probes. Not all operating systems support this option. (Added in 7.25.0)

CURL *curl = curl_easy_init();
if(curl) {
 curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");

 /* enable TCP keep-alive for this transfer */
 curl_easy_setopt(curl, CURLOPT_TCP_KEEPALIVE, 1L);

 /* keep-alive idle time to 120 seconds */
 curl_easy_setopt(curl, CURLOPT_TCP_KEEPIDLE, 120L);

 /* interval time between keep-alive probes: 60 seconds */
 curl_easy_setopt(curl, CURLOPT_TCP_KEEPINTVL, 60L);

 curl_easy_perform(curl);
}

Always Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. CURLOPT_TCP_KEEPALIVE "(3), " CURLOPT_TCP_KEEPIDLE "(3), "