Hugs wish-list item:
> > What's the appropriate forum for this? I can make up a suggested mapping
> > if it's helpful. But I know little about Haskell. Does ghc have some
> > mapping already in place?
>
> It must do since they have an implementation - just a question of
> finding the (unpublished) docs (or the source).
>
> Or, we can wait for the great Hugs-GHC library merger to happen and
> Hugs automatically inherits GHC's mapping.
OK, the relevant info is in the following files in the GHC distro:
ghc/lib/std/PrelIOBase.lhs has a function constructErrorMsg which
calls C functions getErrType__ and getErrStr__ to get the error code
and error string. It then converts the error type to an IOError. For
example, ERR_RESOURCEEXHAUSTED goes to ResourceExhausted.
ghc/lib/std/cbits/errno.c is where these functions live. They simply
read ghc_errtype and ghc_errstr, respectively.
In errno.c, the errno global is converted to ghc_errno by cvtErrno().
This contains mappings like E2BIG -> GHC_E2BIG . Next, stdErrno()
converts ghc_errno to ghc_errtype and ghc_errstr. For example,
GHC_E2BIG goes to ERR_RESOURCEEXHAUSTED and "argument list too long".
Do we agree that this is a reasonable spec for the Hugs mapping?
HTH.
--KW 8-)
