74 lines
2.4 KiB
Groff
74 lines
2.4 KiB
Groff
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.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" * SPDX-License-Identifier: curl
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.\" *
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.\" **************************************************************************
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.\"
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.TH CURLOPT_TCP_KEEPALIVE 3 "19 Jun 2014" libcurl libcurl
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.SH NAME
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CURLOPT_TCP_KEEPALIVE \- TCP keep-alive probing
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_KEEPALIVE, long probe);
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.fi
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.SH DESCRIPTION
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Pass a long. If set to 1, TCP keepalive probes are used. The delay and
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frequency of these probes can be controlled by the
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\fICURLOPT_TCP_KEEPIDLE(3)\fP and \fICURLOPT_TCP_KEEPINTVL(3)\fP options,
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provided the operating system supports them. Set to 0 (default behavior) to
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disable keepalive probes
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.SH DEFAULT
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0
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.SH PROTOCOLS
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All
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.SH EXAMPLE
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.nf
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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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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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/* 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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curl_easy_perform(curl);
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}
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}
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.fi
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.SH AVAILABILITY
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Added in 7.25.0
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.SH RETURN VALUE
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Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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.SH "SEE ALSO"
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.BR CURLOPT_TCP_KEEPIDLE (3),
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.BR CURLOPT_TCP_KEEPINTVL (3),
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.BR CURLOPT_LOW_SPEED_LIMIT (3),
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.BR CURLOPT_MAX_RECV_SPEED_LARGE (3)
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