bug#22344: 25.0.50 (and 24.5.1, 24.4); Sending 4097 bytes to a subprocess hangs Emacs on Windows 8 and 10

[Eli Zaretskii]

> Cc: 22344@debbugs.gnu.org
> From: Clément Pit--Claudel <clement.pit@gmail.com>
> Date: Mon, 11 Jan 2016 13:02:47 -0500
> 
> > Thanks.  Are all the affected programs written in JavaScript?  Do they
> > all set stdin encoding to UTF-8?  If so, does the problem go away if
> > you remove the line that sets the encoding?
> 
> No, the following javascript implementation of cat also reproduces the issue:
> 
> function blackhole() {
>     process.stdin.resume();
>     process.stdin.setEncoding("ascii");
>     process.stdin.on('data', function (chunk) { process.stdout.write(chunk); 
> });
> }
> blackhole();

Could it be that the script exits as soon as it processed the first 4K
chunk, without waiting for the next one, or without waiting long
enough?