x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
CURLOPT_BUFFERSIZE(3) libcurl CURLOPT_BUFFERSIZE(3)
NAME
CURLOPT_BUFFERSIZE - 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 is a benefit of having a larger buffer for per-
formance.
This is just treated as a request, not an order. You cannot be guaran-
teed 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 (10MB). The minimum
buffer size allowed to be set is 1024.
DO NOT set this option on a handle that is currently used for an active
transfer as that may lead to unintended consequences.
The maximum size was 512kB until 7.88.0.
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_MAXFILESIZE(3), CUR-
LOPT_UPLOAD_BUFFERSIZE(3), CURLOPT_WRITEFUNCTION(3)
ibcurl 8.4.0 September 26, 2023 CURLOPT_BUFFERSIZE(3)
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