Andrea:
> > linux-ipc.patch
> >
> > Support for 32-bit UIDs in SysVipc: message queues,
> > semaphores, and shared memory.
> > Also fixes the ABI breakage on Alpha.
>
> Your fix is not necessary. In 2.3.36 alpha uses a particular shmctl
> syscall. If somebody need more than 32bit for specifying the size he
> should simply use the new syscall (that recalls the raw ipc/shm.c code).
> So you don't need to touch this issue anymore in your patches. Left it a
> size_t.
>
Manfred already pointed this out, but I just wanted to clarify: my IPC
patches introduce a new API for msgctl(), semctl(), and shmctl(), along
with new msqid_ds, semid_ds, shmid_ds, shminfo, and ipc_perm structures.
The new API removes existing cruft like the way msg_cbytes was increased
in struct msqid_ds, and sensibly enlarges all variables in these
structures. This is necessary so we can fully support 32-bit UIDs. For
uniformity, this new API applies to all architectures, not just those
which are currently stuck with 16-bit UIDs.
I'd rather have the same API for SysVipc across all Linux architectures,
and keep the new code in ipc/, rather than add more architecture-specific
code.
Thanks,
Chris Wing
wingc@engin.umich.edu
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