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- .\" generated by cd2nroff 0.1 from CURLOPT_TCP_KEEPINTVL.md
- .TH CURLOPT_TCP_KEEPINTVL 3 "2025-01-17" libcurl
- .SH NAME
- CURLOPT_TCP_KEEPINTVL \- TCP keep\-alive interval
- .SH SYNOPSIS
- .nf
- #include <curl/curl.h>
- CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_KEEPINTVL, long interval);
- .fi
- .SH 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.
- .SH DEFAULT
- 60
- .SH PROTOCOLS
- This functionality affects tcp only
- .SH EXAMPLE
- .nf
- 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);
- }
- }
- .fi
- .SH AVAILABILITY
- Added in curl 7.25.0
- .SH RETURN VALUE
- Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
- .SH SEE ALSO
- .BR CURLOPT_TCP_KEEPALIVE (3),
- .BR CURLOPT_TCP_KEEPCNT (3),
- .BR CURLOPT_TCP_KEEPIDLE (3)
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