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CURLOPT_BUFFERSIZE

Section: curl_easy_setopt options (3)
Updated: May 13, 2017
Index Return to Main Contents

 

NAME

CURLOPT_BUFFERSIZE - set preferred receive buffer size  

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_BUFFERSIZE, long size);  

DESCRIPTION

Pass a long specifying your preferred size (in bytes) for the receive buffer in libcurl. The main point of this would be that the write callback gets called more often and with smaller chunks. Secondly, for some protocols, there's a benefit of having a larger buffer for performance.

This is just treated as a request, not an order. You cannot be guaranteed to actually get the given size.

This buffer size is by default CURL_MAX_WRITE_SIZE (16kB). The maximum buffer size allowed to be set is CURL_MAX_READ_SIZE (512kB). The minimum buffer size allowed to be set is 1024.  

DEFAULT

CURL_MAX_WRITE_SIZE (16kB)  

PROTOCOLS

All  

EXAMPLE

CURL *curl = curl_easy_init();
if(curl) {
  curl_easy_setopt(curl, CURLOPT_URL, "sftp://example.com/foo.bin");

  /* ask libcurl to allocate a larger receive buffer */
  curl_easy_setopt(curl, CURLOPT_BUFFERSIZE, 120000L);

  ret = curl_easy_perform(curl);

  curl_easy_cleanup(curl);
}
 

AVAILABILITY

Added in 7.10. Growing the buffer was added in 7.53.0.  

RETURN VALUE

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.  

SEE ALSO

CURLOPT_MAX_RECV_SPEED_LARGE(3), CURLOPT_WRITEFUNCTION(3),


 

Index

NAME
SYNOPSIS
DESCRIPTION
DEFAULT
PROTOCOLS
EXAMPLE
AVAILABILITY
RETURN VALUE
SEE ALSO


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