NAME

       CURLOPT_TCP_KEEPINTVL - TCP keep-alive interval

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_KEEPINTVL, long interval);

DESCRIPTION

       Pass  a long. Sets the interval, in seconds, to wait between sending keepalive probes. Not
       all operating systems support this option. (Added in 7.25.0)

       The maximum value this accepts is 2147483648. Any larger value is capped to this amount.

DEFAULT

       60

PROTOCOLS

       This functionality affects tcp only

EXAMPLE

       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

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

           /* set 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);

           /* maximum number of keep-alive probes: 3 */
           curl_easy_setopt(curl, CURLOPT_TCP_KEEPCNT, 3L);

           curl_easy_perform(curl);
         }
       }

AVAILABILITY

       Added in curl 7.25.0

RETURN VALUE

       Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

SEE ALSO

       CURLOPT_TCP_KEEPALIVE(3), CURLOPT_TCP_KEEPCNT(3), CURLOPT_TCP_KEEPIDLE(3)