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)