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54ded66618
- always assign the curl_easy_perform() return code (and declare the necessary 'result' variable for it) - always call curl_easy_cleanup() on the created easy handles Closes #21364
79 lines
1.6 KiB
Markdown
79 lines
1.6 KiB
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_TCP_KEEPCNT
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_TCP_KEEPALIVE (3)
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- CURLOPT_TCP_KEEPIDLE (3)
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- CURLOPT_TCP_KEEPINTVL (3)
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Protocol:
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- TCP
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Added-in: 8.9.0
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---
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# NAME
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CURLOPT_TCP_KEEPCNT - Maximum number of TCP keep-alive probes
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_KEEPCNT, long cnt);
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~~~
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# DESCRIPTION
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Pass a long. Sets the number of probes to send before dropping
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the connection. Not all operating systems support this option.
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(Added in 8.9.0)
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The maximum value this option accepts is INT_MAX or whatever your
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system allows.
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Any larger value is capped to this amount.
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# DEFAULT
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9
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# %PROTOCOLS%
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# EXAMPLE
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~~~c
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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CURLcode result;
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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/* enable TCP keep-alive for this transfer */
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curl_easy_setopt(curl, CURLOPT_TCP_KEEPALIVE, 1L);
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/* set keep-alive idle time to 120 seconds */
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curl_easy_setopt(curl, CURLOPT_TCP_KEEPIDLE, 120L);
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/* interval time between keep-alive probes: 60 seconds */
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curl_easy_setopt(curl, CURLOPT_TCP_KEEPINTVL, 60L);
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/* maximum number of keep-alive probes: 3 */
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curl_easy_setopt(curl, CURLOPT_TCP_KEEPCNT, 3L);
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result = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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}
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~~~
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# %AVAILABILITY%
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# RETURN VALUE
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curl_easy_setopt(3) returns a CURLcode indicating success or error.
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CURLE_OK (0) means everything was OK, non-zero means an error occurred, see
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libcurl-errors(3).
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