id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
13581	`basic_stream_socket::read_some` on `non_blocked` socket returns `ec=would_block`	Dmytro Ovdiienko <dmitriyovdienko@…>	chris_kohlhoff	"In the `boost\asio\detail\impl\socket_ops.ipp` file there is `sync_recv` function which should block until some data is received.

Inside this function there is following `if` block


{{{
    if ((state & user_set_non_blocking)
        || (ec != boost::asio::error::would_block
          && ec != boost::asio::error::try_again))
      return 0;
}}}


IMHO condition is wrong here. It should return 0 for all cases except socket is in `non_blocking` mode and ec is one of `[would_block, try_again]`

In fact if socket is in 'non-blocked' mode and ec = would_block, it also returns 0. 

If assumption is correct, code should look like

{{{
    if (0 == (state & user_set_non_blocking)
        || (ec != boost::asio::error::would_block
          && ec != boost::asio::error::try_again))
      return 0;
}}}

"	Bugs	new	To Be Determined	asio	Boost Development Trunk	Problem		non-blocked