Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Mon, 9 Jul 2018 22:11:42 -0700
From:   Andrei Vagin <avagin@virtuozzo.com>
To:     Christoph Hellwig <hch@lst.de>
Cc:     Adrian Reber <adrian@lisas.de>, viro@zeniv.linux.org.uk,
        Avi Kivity <avi@scylladb.com>, linux-aio@kvack.org,
        linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 7/7] aio: implement io_pgetevents
Message-ID: <20180710051141.GB21096@outlook.office365.com>
References: <20180502211448.18276-1-hch@lst.de>
 <20180502211448.18276-8-hch@lst.de>
 <20180704142116.GM17048@lisas.de>
 <20180708204359.GA19198@lst.de>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <20180708204359.GA19198@lst.de>
User-Agent: Mutt/1.9.3 (2018-01-21)
Received-SPF: None (protection.outlook.com: virtuozzo.com does not designate
 permitted sender hosts)
SpamDiagnosticOutput: 1:99
SpamDiagnosticMetadata: NSPM
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Jul 2018 05:11:55.6849 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: 06e2031e-0464-46c0-3826-08d5e623a90f
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 0bc7f26d-0264-416e-a6fc-8352af79c58f
X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM6PR08MB3255
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Sun, Jul 08, 2018 at 10:44:00PM +0200, Christoph Hellwig wrote:
> On Wed, Jul 04, 2018 at 04:21:16PM +0200, Adrian Reber wrote:
> > In file included from /usr/include/linux/signal.h:5,
> >                  from /usr/include/linux/aio_abi.h:32,
> >                  from include.c:2:
> > /usr/include/asm/signal.h:16:23: error: conflicting types for ‘sigset_t’
> >  typedef unsigned long sigset_t;
> >                        ^~~~~~~~
> > In file included from /usr/include/signal.h:35,
> >                  from include.c:1:
> > /usr/include/bits/types/sigset_t.h:7:20: note: previous declaration of ‘sigset_t’ was here
> >  typedef __sigset_t sigset_t;
> 
> I guess we could do something like the patch below, although it is
> rather ugly:
> 
> diff --git a/include/uapi/linux/aio_abi.h b/include/uapi/linux/aio_abi.h
> index 75846164290e..b7705ad66d78 100644
> --- a/include/uapi/linux/aio_abi.h
> +++ b/include/uapi/linux/aio_abi.h
> @@ -29,7 +29,11 @@
>  
>  #include <linux/types.h>
>  #include <linux/fs.h>
> +#ifdef __KERNEL__
>  #include <linux/signal.h>
> +#else
> +#include <signal.h>
> +#endif

I think we can not do this because this header specifies the kernel
API, but signal.h is provided by libc and sigset_t can be defined
differently there:

[avagin@laptop ~]$ cat test.c 
#ifdef TEST_LINUX_SIGNAL
#  include <glob.h>
#  include <linux/signal.h>
#else
#  include <signal.h>
#endif
#include <stdio.h>
int main()
{
	printf("sizeof(sigset_t) = %d\n", sizeof(sigset_t));
	return 0;
}
[avagin@laptop ~]$ gcc -DTEST_LINUX_SIGNAL test.c && ./a.out
sizeof(sigset_t) = 8
[avagin@laptop ~]$ gcc test.c && ./a.out
sizeof(sigset_t) = 128

[avagin@laptop include]$ rpm -qf /usr/include/signal.h 
glibc-headers-2.27-8.fc28.i686
glibc-headers-2.27-8.fc28.x86_64
[avagin@laptop include]$ rpm -qf /usr/include/linux/signal.h 
kernel-headers-4.16.5-300.fc28.x86_64

>  #include <asm/byteorder.h>
>  
>  typedef __kernel_ulong_t aio_context_t;