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On Feb 6 07:00, Eric Blake wrote: > On 02/06/2015 02:24 AM, Corinna Vinschen wrote: > > On Feb 5 22:57, Achim Gratz wrote: > >> > >> Oh, and while you are so deep in the bowels of setup.exe, would it be > >> possible to somehow fake a pty to shell scripts and a console to cmd so > >> that the scripts run by setup.exe produce their output in line-buffered > >> instead of fully buffered mode? > > > > Er... uh... *cough*... PTC? > > > > For Cygwin processes this would require to duplicate lots of the pty > > code from Cygwin to Setup. For native commands it might be enough to > > play with the process creation flags in the call to CreateProcess, but > > that might lead to a flickering taskbar entry for a hidden console. > > For native commands (.bat, .cmd postinstalls), I have no idea. But for > cygwin processes (.sh postinstalls), it would be neat if we could get > coreutils' stdbuf utility working on cygwin, then we just invoke 'sh -c > "stdbuf script.sh"' instead of 'sh -c "script.sh"'. > > > > > The other problem is that the stdio handles are redirected to a file > > and thus, even if you have a console or pty, the output from the command > > will use fully buffered mode. > > > > The only way around that, afaics, is some sort of global setting (env > > var?) for the buffering mode which is honored by native processes and > > which may be read by the Cygwin DLL as well to enforce line buffering. > > But I'm not aware such a setting exists. > > stdbuf uses LD_PRELOAD to tell a process in main() that it should use > line or no buffering, regardless of whether the output file is a file. > And cygwin supports LD_PRELOAD. So it probably hooks into setbuf, setbuffer, setlinebuf and setvbuf. LD_PRELOADing libc aka cygwin1.dll itself? That sounds a bit tricky. Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Maintainer cygwin AT cygwin DOT com Red Hat
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