[m-users.] Error handling in io module

[Julien Fischer]

Hi,

On Sat, 11 Feb 2023, Volker Wysk wrote:

> I suggest to add a test to the io module, for an error being zero. Meaning
> no error / success. This could be a constant, say "error_success", or a
> predicate "error_is_success/1".

We can add the predicate "system_error_is_success/1" which will succeed
when the value matches the success condition for the system_error/0 type
(i.e. zero for errno or Windows errors and null for the Java or C#
backends).

Julien.