NAME

       CURLOPT_TCP_KEEPIDLE - TCP keep-alive idle time wait

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_KEEPIDLE, long delay);

DESCRIPTION

       Pass  a  long.  Sets  the  delay,  in seconds, to wait while the connection is idle before
       sending keepalive probes. Not all operating systems support this option.

       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_KEEPINTVL(3)