browser/external/curl-8.3.0/docs/libcurl/opts/CURLOPT_TCP_KEEPALIVE.3
2023-09-27 13:43:06 -04:00

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.TH CURLOPT_TCP_KEEPALIVE 3 "August 22, 2023" "ibcurl 8.3.0" libcurl
.SH NAME
CURLOPT_TCP_KEEPALIVE \- TCP keep-alive probing
.SH SYNOPSIS
.nf
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_KEEPALIVE, long probe);
.fi
.SH DESCRIPTION
Pass a long. If set to 1, TCP keepalive probes are used. The delay and
frequency of these probes can be controlled by the
\fICURLOPT_TCP_KEEPIDLE(3)\fP and \fICURLOPT_TCP_KEEPINTVL(3)\fP options,
provided the operating system supports them. Set to 0 (default behavior) to
disable keepalive probes
.SH DEFAULT
0
.SH PROTOCOLS
All
.SH EXAMPLE
.nf
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);
/* 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);
curl_easy_perform(curl);
}
.fi
.SH AVAILABILITY
Added in 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_KEEPIDLE "(3), " CURLOPT_TCP_KEEPINTVL "(3), "