id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
3150	boost.asio: async_copy(in, out, ...) for POSIX sendfile() support	trapni@…	chris_kohlhoff	"hey guys,

i wanted to use boost and boost.asio in order to implement a web service, however, when transmitting static files, i feel not welcome in just memcpy'ing the file into RAM and copying back into kernel space for transmission over TCP/IP.
that's where POSIX sendfile() comes into play.

it takes an input file descriptor (local file e.g.), an output file descriptor (socket e.g.), offset and count, and transfers data directly from input to output *without* leaving kernel space, this is highly recommented e.g. when sending local files to sockets in HA software.

just like async_read/async_write, i imagine that it could be possible in providing an
  return_type async_copy(input, output, count, finish_callback, ...);

would you mind?"	Feature Requests	new	To Be Determined	asio	Boost 1.39.0	Optimization		sendfile posix asio	trapni@…