Hi Corinna, On Fri, 24 Jan 2020 12:07:30 +0100 Corinna Vinschen wrote: > Too bad. It's pretty strange that CreatePseudoConsole returns a > valid HPCON but then isn't ready to take input immediately. > > > I do not come up with other implementation so far. > > > > Let me consider a while. > > I wonder how others solve this problem. I see that the native OpenSSH > is using Sleeps, too, in their start_with_pty() function, calling > AttachConsole in a loop, but I'm not sure if these are related to pseudo > console usage. The commit message don't explain anything there :(
The essence of the difficulty is that we have to support both cygwin programs and native console apps. If we consider only of native console apps, any time we can use pseudo console. However, pseudo console is not transparent at all, so it cannot be used for cygwin programs. Therefore, current cygwin is switching handles to be used between named-pipe and pseudo console. However, because pseudo console has relatively long latency, if pipe is switched just after writing to pseudo console, the forwarding does not get in time. So the "wait" is needed before switching. I had tried WriteFile(), ReadFile() and DeviceIoControl() for HANDLE hConDrvReference, however, all atempts of them failed. -- Takashi Yano <takashi.y...@nifty.ne.jp>
