romenskiy2012/curl

mirror of https://github.com/curl/curl.git synced 2026-05-14 09:26:19 +03:00

Daniel Stenberg d7d32ad9b9

docs/libcurl: remove ancient version references

To make the texts easier on the eye.

- Remove most free text references to curl versions before 7.60.0 (May
  2018)
- Leave those present in a HISTORY section

Most of them are already documented in symbols-in-versions anyway.

Closes #18530

2025-09-12 08:27:38 +02:00

1.5 KiB

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SPDX-License-Identifier

Title

Section

Source

See-also

Protocol

Added-in

curl

CURLOPT_TCP_KEEPINTVL

libcurl

CURLOPT_TCP_KEEPALIVE (3)

CURLOPT_TCP_KEEPIDLE (3)

CURLOPT_TCP_KEEPCNT (3)

TCP

7.25.0

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

%PROTOCOLS%

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%

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).

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