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70 lines
1.6 KiB
Markdown
70 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_NODELAY
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_BUFFERSIZE (3)
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- CURLOPT_SOCKOPTFUNCTION (3)
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- CURLOPT_TCP_KEEPALIVE (3)
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Protocol:
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- TCP
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---
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# NAME
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CURLOPT_TCP_NODELAY - the TCP_NODELAY option
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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_NODELAY, long nodelay);
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~~~
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# DESCRIPTION
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Pass a long specifying whether the *TCP_NODELAY* option is to be set or
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cleared (1L = set, 0 = clear). The option is set by default. This has no
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effect after the connection has been established.
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Setting this option to 1L disables the Nagle algorithm on connections created
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using this handle. The purpose of this algorithm is to minimize the number of
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small packets on the network (where "small packets" means TCP segments less
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than the Maximum Segment Size for the network).
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Maximizing the amount of data sent per TCP segment is good because it
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amortizes the overhead of the send. However, in some cases small segments may
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need to be sent without delay. This is less efficient than sending larger
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amounts of data at a time, and can contribute to congestion on the network if
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overdone.
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# DEFAULT
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1
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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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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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/* leave Nagle enabled */
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curl_easy_setopt(curl, CURLOPT_TCP_NODELAY, 0);
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curl_easy_perform(curl);
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}
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}
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~~~
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# AVAILABILITY
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Always. The default was changed to 1 from 0 in 7.50.2.
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# RETURN VALUE
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Returns CURLE_OK
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