Messages in this thread | ![/](/images/icornerl.gif) | | From | msmail@colorful ... | Subject | Re: [RFC] proposed IPC changes to support 32-bit UIDs | Date | Wed, 1 Dec 1999 08:11:48 -0500 (EST) |
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> > Hello. In my latest set of 32-bit UID support patches, I've changed the > msgctl(), semctl(), and shmctl() functions to no longer use the same > structures for both kernel and user space (for IPC_STAT, IPC_SET, > MSG_STAT, SEM_STAT, and SHM_STAT). Instead, the msg_queue, semid_ds, and > shmid_ds structures are considered private to the kernel, and there are > now 2 sets of structures for communicating with user space: > > user_msqid_ds, user_semid_ds, user_shmid_ds > and > old_user_msqid_ds, old_user_semid_ds, old_user_shmid_ds > we cannot rename the user space structures: msqid_ds,... are predefined names from the SUS standard, we must rename the kernel structures.
and: I don't know if the new version or the old version should be the default: Many applications don't care about the uid field, but with your patch applied, all recompiled programs would fail on 2.2 kernels.
But I agree that we must change something (the user space code that I use to increase the message queue size > 64 kB is "interesting")
> rather than toss all the new code into the already hairy msgctl(), > semctl(), and shmctl() functions.
or: we could replace the "copy_to_user()" functions. ie. "copy_semid_ds_to_user(src,dest,version)" version=0 -> automatically convert version=1 -> normal copy_to_user
-- Manfred
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