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23 .TH CURLOPT_BUFFERSIZE 3 "May 13, 2017" "libcurl 7.59.0" "curl_easy_setopt options"
26 CURLOPT_BUFFERSIZE \- set preferred receive buffer size
28 #include <curl/curl.h>
30 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_BUFFERSIZE, long size);
32 Pass a long specifying your preferred \fIsize\fP (in bytes) for the receive
33 buffer in libcurl. The main point of this would be that the write callback
34 gets called more often and with smaller chunks. Secondly, for some protocols,
35 there's a benefit of having a larger buffer for performance.
37 This is just treated as a request, not an order. You cannot be guaranteed to
38 actually get the given size.
40 This buffer size is by default \fICURL_MAX_WRITE_SIZE\fP (16kB). The maximum
41 buffer size allowed to be set is \fICURL_MAX_READ_SIZE\fP (512kB). The minimum
42 buffer size allowed to be set is 1024.
44 CURL_MAX_WRITE_SIZE (16kB)
49 CURL *curl = curl_easy_init();
51 curl_easy_setopt(curl, CURLOPT_URL, "sftp://example.com/foo.bin");
53 /* ask libcurl to allocate a larger receive buffer */
54 curl_easy_setopt(curl, CURLOPT_BUFFERSIZE, 120000L);
56 ret = curl_easy_perform(curl);
58 curl_easy_cleanup(curl);
62 Added in 7.10. Growing the buffer was added in 7.53.0.
64 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
66 .BR CURLOPT_MAX_RECV_SPEED_LARGE "(3), " CURLOPT_WRITEFUNCTION "(3), "