[project @ 2001-01-08 12:58:45 by chak]
Revision of Marcin's QError module
* I think, there was a rough consensus that Marcin's module provides the
right kind of interface for handling "errno"s
* Malcolm preferred an enumeration, but Marcin made a convincing argument
that this doesn't go well with architecture-dependent variations of "errno"
* Recoded the hsc magic into autoconf magic
* In hsc files, errno constants can be accessed directly; to provide access
for ordinary Haskell programmer, constants for a range of common symbols are
provided (their values are determined by configure)
* Introduced an `Errno' newtype to increase type safety
* renamed the throwIfXXX functions to throwErrnoIfXXX to have the original
names available in the language independent MarshalError
* FIXME: We need a thread local getErrno in the RTS!
(It all compiles, but is still to be tested.)