[m-users.] Yet another piece for the posix library: strerror(3)

[Julien Fischer]

On Mon, 28 Oct 2019, Volker Wysk wrote:

> Am Montag, den 28.10.2019, 16:12 +1100 schrieb Peter Wang:
>> On Mon, 28 Oct 2019 16:06:47 +1100 (AEDT), Julien Fischer <
>> jfischer at opturion.com> wrote:
>> > Hi Volker
>> > 
>> > On Sun, 27 Oct 2019, Volker Wysk wrote:
>> > 
>> > > I've extended the posix library again, this time with the
>> > > strerror(3)
>> > > call. I had to modify posix.m in order to do it.
>> > 
>> > That's not referentially transparent as the error message returned
>> > will
>> > be affected by the current locale setting.  This can be fixed by
>> > making
>> > the interface into:
>> > 
>> >     :- pred strerror(posix.error::in, string::out, io::di, io::uo)
>> > is det.
>> > 
>> 
>> The standard library makes the same mistake :P
>
> It's included in the standard library? What standard library?

Mercury's standard library; it's what the predicate io.make_err_msg
ultimately calls.

>> Also, you should consider using MR_strerror() from the runtime
>> directory
>> instead of strerror_r() directly.
>
> What is the "runtime directory"?

The runtime directory in the Mercury source tree.

Julien.