## NAME

CURLOPT_TCP_KEEPINTVL - set 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, that the operating system will wait between sending keepalive probes. Not all operating systems support this option. (Added in 7.25.0)

## DEFAULT

## PROTOCOLS

## EXAMPLE

    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);
    }

## AVAILABILITY

Always

## RETURN VALUE

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

## SEE ALSO

CURLOPT_TCP_KEEPALIVE, CURLOPT_TCP_KEEPIDLE

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