Date: Thu, 6 Nov 2003 16:10:17 -0800 (PST) From: Eric Anholt <eta@lclark.edu> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/55835: Linux IPC emulation missing SETALL syscall Message-ID: <200311070010.hA70AH7H046247@freefall.freebsd.org>
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The following reply was made to PR kern/55835; it has been noted by GNATS.
From: Eric Anholt <eta@lclark.edu>
To: gnats <freebsd-gnats-submit@FreeBSD.ORG>
Cc: martin@gneto.com
Subject: Re: kern/55835: Linux IPC emulation missing SETALL syscall
Date: Thu, 06 Nov 2003 16:04:42 -0800
On Thu, 2003-11-06 at 07:19, Martin Nilsson wrote:
> Hi,
>
> While in the linuxulator can you please take a look at kern/55835
> it is a very simple patch that makes it possible to run the Pervasive
> database (btrieve) on FreeBSD.
>
> Thanks,
>
> Martin
I compared the linux and FreeBSD SETALL ioctls, and there was one
difference I saw. On linux SETALL updates sem_ctime, while the FreeBSD
version doesn't. Since I don't actually understand how this code works
and how correct we demand our linux compat to be, or if updating
sem_ctime would be valuable for FreeBSD, I don't think I'll commit it
unless another committer chimes in.
>From a linux semctl manpage:
SETALL Set semval for all semaphores of the set using arg.array,
updating also the sem_ctime member of the semid_ds struc-
ture associated to the set. Undo entries are cleared for
altered semaphores in all processes. Processes sleeping on
the wait queue are awakened if some semval becomes 0 or
increases. The argument semnum is ignored. The calling
process must have alter access privileges on the semaphore
set.
--
Eric Anholt eta@lclark.edu
http://people.freebsd.org/~anholt/ anholt@FreeBSD.org
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