Thanks. Committed.
-Alexei
On Sun, Aug 9, 2009 at 7:45 PM, Michael Schmitt<msb2ssdev@me> wrote:
> Attached is a patch to Basilisk II, to fix a problem seen in SheepShaver.
>
> SheepShaver includes the C errno string in many error messages. One case is
> when it calls the memory allocation routines in the Basilisk II vm_alloc.cpp
> program.
>
> This works when the memory allocation routine uses functions that set errno
> (such as mmap or malloc). For example, running SheepShaver on a Linux hosts
> produces meaningful error messages.
>
> The problem is that when run on an OS X host, the memory allocation uses
> Mach routines such as vm_allocate, which do not set errno.
>
> So when SheepShaver reported the error, it used a stale value of errno,
> which happened to be 17. The result was an extremely misleading error
> message: "Cannot map RAM: File already exists".
>
> The fix is to change vm_alloc so that it translates Mac return codes into
> POSIX errno values.
>
> It also initializes errno to 0 at the start of the memory allocation
> routine, so that no matter what path it takes, it won't return a stale
> value.
>
> There are no changes to the calling programs.
>
>
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