[m-users.] sleep(3) for the posix library

[Julien Fischer]

Hi Volker,

On Sat, 14 Mar 2020, Volker Wysk wrote:

> Here's another small piece for the posix library: the sleep(3) library
> call.

That doesn't wrap the sleep() function as POSIX describes it:
<https://pubs.opengroup.org/onlinepubs/009695399/functions/sleep.html>

You completely ignore the return value for one thing.  If you're using
Mercury 20.01 or later it would probaby be worth changing the argument
that gives the number seconds to an unsigned type as well.

Julien.