From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <4A116EA1.6050303@domain.hid>
Date: Mon, 18 May 2009 16:20:17 +0200
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
MIME-Version: 1.0
References: <abaf774b0905180656y4eddca23h6241c9dc031a3ba4@domain.hid>
	<4A116AC5.7010704@domain.hid> <4A116D6D.7020105@domain.hid>
In-Reply-To: <4A116D6D.7020105@domain.hid>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Subject: Re: [Xenomai-help] select(2) generates EFAULT
List-Id: Help regarding installation and common use of Xenomai
	<xenomai.xenomai.org>
List-Unsubscribe: <https://mail.gna.org/listinfo/xenomai-help>,
	<mailto:xenomai-help-request@domain.hid>
List-Archive: </public/xenomai-help>
List-Post: <mailto:xenomai@xenomai.org>
List-Help: <mailto:xenomai-help-request@domain.hid>
List-Subscribe: <https://mail.gna.org/listinfo/xenomai-help>,
	<mailto:xenomai-help-request@domain.hid>
To: Jan Kiszka <jan.kiszka@domain.hid>
Cc: xenomai@xenomai.org

Jan Kiszka wrote:
> Gilles Chanteperdrix wrote:
>> Steve wrote:
>>> First, thank you for the help on my previous query.
>>>
>>> I am still working on porting a c++ application from RTAI to Xenomai,
>>> and have encountered a problem with sockets, specifically the select
>>> function.
>>>
>>> When Xenomai is not being used the code runs as expected.  Once the
>>> Xenomai headers, compile options, etc, are used the select function
>>> fails with the error EFAULT.  I have reproduced the error (works
>>> without Xenomai, EFAULTs with Xenomai) using the following program:
>>>
>>> #include <stdio.h>
>>> #include <arpa/inet.h>
>>> #include <errno.h>
>>>
>>> int handleError(char *msg, int err);
>>>
>>> int main(void)
>>> {
>>>    int sfd;
>>>    struct sockaddr_in sai;
>>>    fd_set SockSet;
>>>    struct timeval tv;
>>>    tv.tv_sec = 2;
>>>    tv.tv_usec = 0;
>>>
>>>    sai.sin_family = AF_INET;
>>>    sai.sin_port = htons(1025);
>>>    sai.sin_addr.s_addr = htonl(INADDR_ANY);
>>>
>>>    if((sfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
>>>    { return handleError("creation error", errno); }
>>>
>>>    if(bind(sfd, (struct sockaddr*)&sai, sizeof(sai)) == -1)
>>>    { return handleError("bind error", errno); }
>>>
>>>    if(listen(sfd, 5) == -1)
>>>    { return handleError("listen error", errno); }
>>>
>>>    FD_ZERO(&SockSet);
>>>    FD_SET(sfd, &SockSet);
>>>
>>>    if(select(sfd+1, &SockSet, 0, 0, &tv) == -1)
>>>    { return handleError("select error", errno); }
>>>
>>>    printf("success\n");
>>>
>>>    return 0;
>>> }
>>>
>>> I am using Xenomai 2.4.6.1 on a vanilla 2.6.24.6 Linux kernel, and
>>> running on Ubuntu 8.04.
>> Could you try 2.4.7, to see if you are not having a bug which has
>> already been fixed?
>>
>> What you are trying should work, even though you are not really using
>> Xenomai's select but Linux plain select.
> 
> This should have been fixed in 2.4.x.git - if my patch were applied. See
> git://git.xenomai.org/xenomai-jki.git for-2.4.x
> 
> Did I missed to post some correction of that version, or what delays
> this? Sorry, lost track of it.

Sorry, I do not see what patch you are refering to. Is it:
http://git.xenomai.org/?p=xenomai-jki.git;a=commitdiff;h=86333965a4362f8439822ec9d22b0a84b5701141;hp=a219c4a71b381f4662df45bac5508c3ae64ab924

In this commit, I only see things which should return more -EFAULT. Or
did I miss something?

-- 
                                                 Gilles.