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                     23: .TH CURLOPT_TCP_KEEPINTVL 3 "March 23, 2020" "libcurl 7.70.0" "curl_easy_setopt options"
                     24: 
                     25: .SH NAME
                     26: CURLOPT_TCP_KEEPINTVL \- set TCP keep-alive interval
                     27: .SH SYNOPSIS
                     28: #include <curl/curl.h>
                     29: 
                     30: CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_KEEPINTVL, long interval);
                     31: .SH DESCRIPTION
                     32: Pass a long. Sets the interval, in seconds, that the operating system will
                     33: wait between sending keepalive probes. Not all operating systems support this
                     34: option. (Added in 7.25.0)
                     35: .SH DEFAULT
                     36: 60
                     37: .SH PROTOCOLS
                     38: All
                     39: .SH EXAMPLE
                     40: .nf
                     41: CURL *curl = curl_easy_init();
                     42: if(curl) {
                     43:   curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
                     44: 
                     45:   /* enable TCP keep-alive for this transfer */
                     46:   curl_easy_setopt(curl, CURLOPT_TCP_KEEPALIVE, 1L);
                     47: 
                     48:   /* set keep-alive idle time to 120 seconds */
                     49:   curl_easy_setopt(curl, CURLOPT_TCP_KEEPIDLE, 120L);
                     50: 
                     51:   /* interval time between keep-alive probes: 60 seconds */
                     52:   curl_easy_setopt(curl, CURLOPT_TCP_KEEPINTVL, 60L);
                     53: 
                     54:   curl_easy_perform(curl);
                     55: }
                     56: .fi
                     57: .SH AVAILABILITY
                     58: Always
                     59: .SH RETURN VALUE
                     60: Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
                     61: .SH "SEE ALSO"
                     62: .BR CURLOPT_TCP_KEEPALIVE "(3), " CURLOPT_TCP_KEEPIDLE "(3), "