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Date: Sun, 11 Jun 2006 19:33:00 -0000
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From: Eli Zaretskii <eliz@gnu.org>
To: gdb-patches@sourceware.org
In-reply-to: <20060610234357.GB10491@nevyn.them.org> (message from Daniel 	Jacobowitz on Sat, 10 Jun 2006 19:43:57 -0400)
Subject: Re: Windows semihosting (remote-fileio) fix for console reads
Reply-to: Eli Zaretskii <eliz@gnu.org>
References: <20060610182130.GA3527@nevyn.them.org> <uwtbopuny.fsf@gnu.org> <20060610234357.GB10491@nevyn.them.org>
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> Date: Sat, 10 Jun 2006 19:43:57 -0400
> From: Daniel Jacobowitz <drow@false.org>
> 
> #include <unistd.h>
> #include <stdio.h>
> #include <errno.h>
> #include <string.h>
> 
> static char buf[32768];
> 
> int
> main (int argc, char **argv)
> {
>   int ret, err;
> 
>   sprintf (buf, "Type something:\n");
>   write (1, buf, strlen (buf));
>   errno = 0;
>   ret = read (0, buf, 26609);
>   err = errno;
> 
>   sprintf (buf, "read returned %d, errno %d\n", ret, err);
>   write (1, buf, strlen (buf));
>   return 0;
> }

I tried this on two XP boxes: on one, 26609 was the smallest value
that failed, on the other it started to fail with 31005.  Go figure.

Anyway, I suggest to go for 16K; 8K sounds too conservative.