20 messages in org.freebsd.freebsd-archRe: short uid/gid| From | Sent On | Attachments |
|---|---|---|
| Vladimir B. Grebenschikov,Moscow,408-7227,123-4567,Some-info | Oct 14, 2002 12:33 am | |
| Robert Watson | Oct 14, 2002 10:27 am | |
| Maxim Sobolev | Oct 14, 2002 12:17 pm | |
| Danny J. Zerkel | Oct 15, 2002 7:47 pm | |
| Terry Lambert | Oct 15, 2002 9:35 pm | |
| Robert Watson | Oct 15, 2002 9:42 pm | |
| Terry Lambert | Oct 16, 2002 2:03 am | |
| Maxim Sobolev | Oct 16, 2002 2:30 am | |
| Robert Watson | Oct 16, 2002 6:03 am | |
| Maxim Sobolev | Oct 16, 2002 8:06 am | |
| Robert Watson | Oct 16, 2002 9:06 am | |
| Terry Lambert | Oct 16, 2002 9:29 am | |
| Terry Lambert | Oct 16, 2002 9:45 am | |
| Robert Watson | Oct 16, 2002 10:01 am | |
| Gary Thorpe | Oct 16, 2002 10:38 am | |
| Terry Lambert | Oct 16, 2002 11:02 am | |
| Terry Lambert | Oct 16, 2002 11:13 am | |
| Danny J. Zerkel | Oct 16, 2002 4:50 pm | |
| Danny J. Zerkel | Oct 16, 2002 8:44 pm | |
| Terry Lambert | Oct 16, 2002 11:06 pm |
| Subject: | Re: short uid/gid | |
|---|---|---|
| From: | Maxim Sobolev (sobo...@FreeBSD.ORG) | |
| Date: | Oct 16, 2002 2:30:26 am | |
| List: | org.freebsd.freebsd-arch | |
On Wed, Oct 16, 2002 at 02:03:53AM -0700, Terry Lambert wrote:
Robert Watson wrote:
While I think support for the IPC_64 flag under emulation is useful, I'd rather make use of compatibility system calls and type improvements for the base FreeBSD implementation of the System V IPC APIs. Most of the work necessary to support those changes is required in order to better support fine-grained locking and MAC (breaking out the user and kernel structures). Also, it means future applications will make use of the improved APIs by default. In addition, other systems, such as Solaris, have already made this change in this way, avoiding the IPC_64 flag design.
You could also simply use non-intersecting cmd parameter values for the new calls, which avaids the special flag, and leaves the backward compatability without adding grundles of new system calls.
What about source-level compatibility, which IMO is a good thing, at least if it doesn't add too much complexity (it clearly doesn't in this case)? Also, handling single flag should be easier from the coding perspective than a load of new values, after all we can do something like:
#define IPC_STAT_OLD 0xXY #define IPC_SET_OLD 0xZW [...]
#define IPC_64 0x100
#define IPC_STAT (IPC_STAT_OLD | IPC_64) #define IPC_SET (IPC_SET_OLD | IPC_64) [...]
Which automagically will bring 64-version of syscalls after recompilation, while retaining ABI compatibility.
-Maxim
I thought that everything was going to 64 bits and we were getting a new system call entry vector in 5.x, anyway... wasn't Matt going to do something like that?
-- Terry
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