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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Preview: portable dumper
Date: Mon, 19 Feb 2018 22:18:05 +0200
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> From: Andy Moreton <andrewjmoreton@gmail.com>
> Date: Mon, 19 Feb 2018 20:03:09 +0000
> 
>     int sys_read(int fd, char *buffer, unsigned int count);
> 
> The limit for a chunk should be INT_MAX (not UINT_MAX) so that it
> is representable in the (signed) return value.

We should be able to change sys_read to return ssize_t instead.  Can
you try that?