Date: Mon, 14 Apr 2008 14:41:50 +0530 From: Manik Taneja <mantanej@ironport.com> To: Roman Divacky <rdivacky@freebsd.org> Cc: freebsd-emulation@freebsd.org Subject: Re: Purify on FreeBSD Message-ID: <C4291DAE.2902%mantanej@ironport.com> In-Reply-To: <20080412094428.GA88981@freebsd.org>
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Hi Roman,
I have installed the linux_base-fc4 on my FreeBSD machine via ports. When
you say that I need to build the linux module with -DDEBUG flag enabled, you
are referring to the Free BSD linux module, correct ?
The problem is the machine is a shared and linux binary compatibility has
been statistically linked into the kernel and there is nothing much I can do
on that front.
[root@curry /usr/ports/emulators/linux_base-fc4]# kldload linux
kldload: can't load linux: File exists
[
root@curry /usr/ports/emulators/linux_base-fc4]# kldstat
Id Refs Address Size Name
1 1 0xc0400000 502154 kernel
The source of the program that failed is nothing but a simple program that
makes use of the fork system call .
#include <stdio.h>
int main (int argc, char *argv[])
{
switch (fork()) {
case -1:
printf ("error");
break;
case 0:
printf ("parent");
break;
default:
printf ("child");
break;
}
return 0;
}
Thanks for your help.
Regards,
Manik
On 12/04/08 3:14 PM, "Roman Divacky" <rdivacky@freebsd.org> wrote:
> On Fri, Apr 11, 2008 at 08:17:28PM +0530, Manik Taneja wrote:
>> Hi,
>>
>> I'm trying to get purify that was built on a linux (RHEL 4) machine to run
>> on a FreeBSD 6.3 system with linux emulation (fc4) installed on it.
>>
>> The first issue that I'm running into is the following. If write a simple C
>> program that uses fork(), build that on a linux system and run that on BSD
>> it fails with the following error.
>>
>> curry:~/rational/hacks 09:37 AM $pwd
>> /home/mantanej/rational/hacks
>> curry:~/rational/hacks 09:37 AM $./a.out
>> fork: Invalid argument
>>
>> However, if use a program that doesn't use fork, but uses system calls such
>> as malloc (sbrk) , open etc, that just works fine without any complaints. So
>> looks like this is probably a bug in the fork emulator on linux. See below
>> for output of truss .
>
> DONT TRUST TRUSS... it does not work with linuxulator.. we should put some big
> fat warning somewhere.... still.. in this case I guess it identified the
> problem
> correctly
>
>
> can you build -DDEBUG linux module and show me what are the parameters passed
> to the clone() ? do you have source of your testing program available?
>
> thnx
>
> roman
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