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, that the operating system will 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 will be capped to this amount.

DEFAULT¶

60

PROTOCOLS¶

All

EXAMPLE¶

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);


  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(3), CURLOPT_TCP_KEEPIDLE(3),