write not buffered with custom configuration

[Andy Valencia]

On Saturday, 28 February 2026 at 16:43:27 UTC, H. S. Teoh wrote:
> In general, stderr is unbuffered, whereas stdout is buffered.

POSIX has some implied fflush'ing of stdout, mostly having to do 
with cases where stdin is a terminal.  Modern best practices have 
converged on flushing for yourself at the point where you want 
the output to be seen.

Andy