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Re: [PATCH] x86: Wire up 32-bit direct socket calls
- From: Arnd Bergmann <arnd at arndb dot de>
- To: Geert Uytterhoeven <geert at linux-m68k dot org>
- Cc: Heiko Carstens <heiko dot carstens at de dot ibm dot com>, "H. Peter Anvin" <hpa at zytor dot com>, Andy Lutomirski <luto at kernel dot org>, X86 ML <x86 at kernel dot org>, Network Development <netdev at vger dot kernel dot org>, Tulio Magno Quites Machado Filho <tuliom at linux dot vnet dot ibm dot com>, Andy Lutomirski <luto at amacapital dot net>, "linux-kernel at vger dot kernel dot org" <linux-kernel at vger dot kernel dot org>, Alexander Larsson <alexl at redhat dot com>, Cosimo Cecchi <cosimo at endlessm dot com>, Dan Nicholson <nicholson at endlessm dot com>, libc-alpha <libc-alpha at sourceware dot org>, Rajalakshmi Srinivasaraghavan <raji at linux dot vnet dot ibm dot com>, Linux-Arch <linux-arch at vger dot kernel dot org>
- Date: Fri, 11 Sep 2015 12:14:13 +0200
- Subject: Re: [PATCH] x86: Wire up 32-bit direct socket calls
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- References: <cb5138299d37d5800e2d135b01a7667fa6115854 dot 1436912629 dot git dot luto at kernel dot org> <49726621 dot LPTnfQXYGz at wuerfel> <CAMuHMdXX31xZ4AS6FbeXLXgDn5UV5=0C3hrihuwDOP_abuJsBg at mail dot gmail dot com>
On Friday 11 September 2015 11:54:50 Geert Uytterhoeven wrote:
> To make sure I don't miss any (it seems I missed recvmmsg and sendmmsg for
> the socketcall case, sigh), this is the list of ipc syscalls to implement?
>
> sys_msgget
> sys_msgctl
> sys_msgrcv
> sys_msgsnd
> sys_semget
> sys_semctl
> sys_semtimedop
> sys_shmget
> sys_shmctl
> sys_shmat
> sys_shmdt
>
> sys_semop() seems to be unneeded because it can be implemented using
> sys_semtimedop()?
>
Yes, that list looks right. IPC also includes a set of six sys_mq_*
call, but I believe that everyone already has those as they are not
covered by sys_ipc.
For y2038 compatibility, we will likely add a new variant of
semtimedop that takes a 64-bit timespec. While the argument passed
there is a relative time that will never need to be longer than 68
years, we need to accommodate user space that defines timespec
in a sane way, and converting the argument in libc would be awkward.
Arnd