Tribblix: manual page: CURLOPT_TCP

CURLOPT_TCP_KEEPIDLE(3) Introduction to Library Functions

NAME

CURLOPT_TCP_KEEPIDLE - TCP keep-alive idle time wait

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_KEEPIDLE, long delay);

DESCRIPTION

Pass a long. Sets the delay, in seconds, to wait while the connection
is idle before sending keepalive probes. Not all operating systems
support this option.

The maximum value this accepts is 2147483648. Any larger value is
capped to this amount.

DEFAULT

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

curl_easy_setopt(3) returns a CURLcode indicating success or error.

CURLE_OK (0) means everything was OK, non-zero means an error
occurred, see libcurl-errors(3).