CURLOPT_TCP_KEEPINTVL - TCP keep-alive interval
NAME SYNOPSIS DESCRIPTION DEFAULT PROTOCOLS EXAMPLE AVAILABILITY RETURN VALUE SEE ALSONAME
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.
The maximum value this accepts is 2147483648. Any larger value is capped to this amount.
DEFAULT
60
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).
SEE ALSO
CURLOPT_TCP_KEEPALIVE(3), CURLOPT_TCP_KEEPCNT(3), CURLOPT_TCP_KEEPIDLE(3)