-0, what does it refer to?

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curlopt_tcp_keepintvl

CURLOPT_TCP_KEEPINTVL(3)				     curl_easy_setopt options					  CURLOPT_TCP_KEEPINTVL(3)

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

       60

PROTOCOLS

       All

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);

	 /* 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),

libcurl 7.54.0							 January 02, 2017					  CURLOPT_TCP_KEEPINTVL(3)

UNIX for Dummies Questions & Answers