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CURLOPT_TCP_KEEPINTVL(3) Library Functions Manual CURLOPT_TCP_KEEPINTVL(3) 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. 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) { CURLcode result; 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); result = curl_easy_perform(curl); curl_easy_cleanup(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) libcurl 2026-06-11 CURLOPT_TCP_KEEPINTVL(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | AVAILABILITY | RETURN VALUE | SEE ALSO
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