On Thu, 25 Feb 2021, Emil Engler via curl-library wrote:
I recently thought about implementing the syscall sendfile(2) into
libcurl to speed up downloads to a file.
An interesting idea, but one full of caveats.
sendfile would only work (effectively) for clear-text downloads using TCP (ie
not TLS nor UDP and HTTP/2 isn't really done for it either and not compressed
or chunked HTTP/1 either) but I still think the "downloads to a file
(descriptor)" is the biggest limiting factor.
The only time libcurl knows that it downloads to a file is when the write
callback is left at default and only CURLOPT_WRITEDATA is set, which not even
the curl tool does...
I'm not dismissing the idea, but it certainly isn't entirely straight-forward.
--
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