bug#44320: [PATH] [27.1] Make sure send-string-to-terminal send all contents

[Eli Zaretskii]

> From: Andreas Schwab <schwab@linux-m68k.org>
> Cc: lin.sun@zoom.us,  larsi@gnus.org,  sunlin7@yahoo.com,
>   44320@debbugs.gnu.org
> Date: Mon, 02 Nov 2020 17:41:56 +0100
> 
> On Nov 02 2020, Eli Zaretskii wrote:
> 
> > So you are saying that the call to 'write' issued by 'fwrite' or
> > 'fflush' was interrupted by SIGIO, and that is why it didn't write all
> > of its data?
> 
> It wrote none of it.

I see in the trace a series of 'write' calls that write chunks of up
to 4K bytes:

  write(6, "!9?C...", 16384) = 4096
  write(6, "O??@...", 12288) = 4096
  write(6, "49!6...", 8192) = 4096
  write(6, "15!9...", 4096) = 2048
  write(6, "~~{F...", 2048) = 1792
  write(6, "D@b@...", 256) = ? ERESTARTSYS (To be restarted if SA_RESTART is 
set)

So it looks like only the last call didn't write anything?  Or is my
interpretation wrong?