Re: ISO/IEC 14519 - Ada POSIX binding

[Florian Weimer <fw@deneb.enyo.de>]

David Emery <demery@cox.net> writes:

> If you read the rationale (one of the best parts of the document,
> IMHO), you'll see that the primary consideration for this decision
> is the fact that the set of errors for any given POSIX system call
> is NOT fixed.  POSIX defines a minimum set of error conditions,
> implementations may add additional errors (and most have, particularly
> as network-based computing has expanded.) Any error handling technique
> must accomodate extension.

And the POSIX.5 mechanism gives us this extensibility?  I don't think
so.

If a POSIX.5 implementation raises an exception not expected by the
application, it won't be able to attribute it to the POSIX subsystem
at all (unless the application jumps through hoops and uses the Ada 95
feature that yields the full expanded name of the exception).