SM_NOTIFY procedure.
Remove our hand-coded one as it was causing world breakage for
worlds compiled with NOSHARED=yes because the static linker is a
bit less forgiving (or not as broken as) our dynamic linker.
Add $FreeBSD$ while I'm here.
Pointed out by: bde
- Use MAP_FAILED instead of the constant -1 to indicate
failure (required by POSIX).
- Removed flag arguments of '0' (required by POSIX).
- Fixed code which expected an error return of 0.
- Fixed code which thought any address with the high bit set
was an error.
- Check for failure where no checks were present.
Discussed with: bde
