CURLOPT_TCP_KEEPINTVL.md

c	SPDX-License-Identifier	Title	Section	Source	See-also	Protocol
Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.	curl	CURLOPT_TCP_KEEPINTVL	3	libcurl	CURLOPT_TCP_KEEPALIVE (3) CURLOPT_TCP_KEEPIDLE (3)	All

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

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);

    curl_easy_perform(curl);
  }
}

AVAILABILITY

Always

RETURN VALUE

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