plucky (3) CURLOPT_TCP_NODELAY.3.gz

NAME

       CURLOPT_TCP_NODELAY - the TCP_NODELAY option

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_NODELAY, long nodelay);

DESCRIPTION

       Pass  a long specifying whether the TCP_NODELAY option is to be set or cleared (1L = set, 0 = clear). The
       option is set by default. This has no effect after the connection has been established.

       Setting this option to 1L disables the Nagle algorithm on connections  created  using  this  handle.  The
       purpose  of  this  algorithm  is  to  minimize  the  number of small packets on the network (where "small
       packets" means TCP segments less than the Maximum Segment Size for the network).

       Maximizing the amount of data sent per TCP segment is good because it amortizes the overhead of the send.
       However,  in  some  cases  small  segments may need to be sent without delay. This is less efficient than
       sending larger amounts of data at a time, and can contribute to congestion on the network if overdone.

DEFAULT

       1

PROTOCOLS

       This functionality affects tcp only

EXAMPLE

       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
           /* leave Nagle enabled */
           curl_easy_setopt(curl, CURLOPT_TCP_NODELAY, 0);
           curl_easy_perform(curl);
         }
       }

HISTORY

       The default was changed to 1 from 0 in 7.50.2.

AVAILABILITY

       Added in curl 7.11.2

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).

SEE ALSO

       CURLOPT_BUFFERSIZE(3), CURLOPT_SOCKOPTFUNCTION(3), CURLOPT_TCP_KEEPALIVE(3)