[Windows] Setting the capacity of the underline pipe

[PolarGoose]

I have encountered a similar issue to Setting the capacity of the underline pipe. Linux only but on Windows.

My code is the following:

void RunProcess(const std::string& exePath, std::vector<std::string> args) {
  boost::asio::io_context ctx;
  boost::asio::readable_pipe stdOutPipe(ctx), stdErrPipe(ctx);
  boost::process::v2::process proc(ctx, exePath, args, boost::process::v2::process_stdio{ {}, stdOutPipe, stdErrPipe }, boost::process::v2::windows::show_window_hide);
  /* ... */

The readable_pipe gets a native pipe of only 8kb here: connect_pipe.ipp::create_pipe

8kb is very little if we need to get a lot of input from a process because the process will have to get blocked constantly until the pipe is cleared.

Is it possible to increase the pipe buffer size?

[klemens-morgenstern]

Yes, just use stdOutPipe.native_handle() with fcntl.

[PolarGoose]

@klemens-morgenstern,

Thank you for the response. I saw that fcntl can work for Linux.
Is it available on Windows?