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From: Laurent Vivier <laurent@vivier.eu>
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Date: Sat, 2 Jul 2016 23:28:18 +0200
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Subject: Re: [Qemu-devel] [PATCH] linux-user: fix signal() syscall on x86_64
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To: Peter Maydell <peter.maydell@linaro.org>
Cc: "Wirth, Allan" <awirth@akamai.com>, "qemu-trivial@nongnu.org" <qemu-trivial@nongnu.org>, Riku Voipio <riku.voipio@iki.fi>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, Timothy Pearson <tpearson@raptorengineering.com>



Le 02/07/2016 à 23:20, Peter Maydell a écrit :
> On 2 July 2016 at 22:17, Laurent Vivier <laurent@vivier.eu> wrote:
>> Le 02/07/2016 à 22:12, Peter Maydell a écrit :
>>> (1) Define neither NR_select nor NR__newselect
>>>  (and use pselect6 syscall for select):
>>>  aarch64, openrisc, tilegx, unicore32, presumably any future arch
>>
>> They use:
>>
>> kernel/sys.c:
>>
>> #undef __SYSCALL
>> #define __SYSCALL(nr, call) [nr] = (call),
>>
>> void *sys_call_table[__NR_syscalls] = {
>> #include <asm/unistd.h>
>> };
>>
>> It's not very clear, but I think they use NR_select with sys_select:
>>
>> include/uapi/asm-generic/unistd.h
>>
>> #define __ARCH_WANT_SYS_SELECT
>> __SYSCALL(__NR_select, sys_select)
> 
> This is inside an #ifdef __ARCH_WANT_SYSCALL_DEPRECATED.
> Only arch/score defines that; most architectures using
> the asm-generic syscall numbers don't want these
> obsolete syscalls to exist.

I've missed that... so you're right on everything.

Thanks,
Laurent