libvirt users - Dec 2013 - Re: Question about setns recognising in libvirt autoconf

On 2013-12-09 13:18 , Gao feng wrote:
On 12/09/2013 01:06 PM, hzguanqiang@corp.netease.com
wrote:
> Hi experts,
>  
> When I test lxc container with lxc-enter-namespace command, It reported an
error as
> following:
> root@debian:~/github/libvirt# vir lxc-enter-namespace lxc --noseclabel
/bin/df -hl
> error: Cannot get namespaces for 3145: Function not implemented
>  
> It seems that setns is not supported by my kernel.
>  
> But from the following info, It seemed the reason is just libvirt/autoconf
doesn't
> recgonise setns.
> root@debian:~/github/libvirt# grep setns /proc/kallsyms
> ffffffff8105b78b T SyS_setns
> ffffffff8105b78b T sys_setns
> root@debian:~/github/libvirt# ./configure | grep setns
> checking for setns... no
>  
> What the problem really is ? How can I fix this problem?
What's the result of grep -R "setns" /usr/include/*


Hi Gaofeng,
The result you want is as following:

root@debian:~/github/libvirt# grep -R "setns" /usr/include/*
/usr/include/asm-generic/unistd.h:#define __NR_setns 268
/usr/include/asm-generic/unistd.h:__SYSCALL(__NR_setns, sys_setns)
/usr/include/x86_64-linux-gnu/bits/syscall.h:#define SYS_setns __NR_setns
/usr/include/x86_64-linux-gnu/asm/unistd_64.h:#define __NR_setns                
308
/usr/include/x86_64-linux-gnu/asm/unistd_64.h:__SYSCALL(__NR_setns, sys_setns)
/usr/include/x86_64-linux-gnu/asm/unistd_32.h:#define __NR_setns               
346

------------------     
Best regards!
GuanQiang
13:21:12

Hi Gaofeng,
It seems that I've got the answer.
In manual page about setns, it said that library support was added to glibc
in version 2.14 while my libc version is 2.13.

Thanks for help anyway.

On 2013-12-09 13:22 , hzguanqiang@corp.netease.com wrote:
On 2013-12-09 13:18 , Gao feng wrote:
On 12/09/2013 01:06 PM, hzguanqiang@corp.netease.com
wrote:
> Hi experts,
>  
> When I test lxc container with lxc-enter-namespace command, It reported an
error as
> following:
> root@debian:~/github/libvirt# vir lxc-enter-namespace lxc --noseclabel
/bin/df -hl
> error: Cannot get namespaces for 3145: Function not implemented
>  
> It seems that setns is not supported by my kernel.
>  
> But from the following info, It seemed the reason is just libvirt/autoconf
doesn't
> recgonise setns.
> root@debian:~/github/libvirt# grep setns /proc/kallsyms
> ffffffff8105b78b T SyS_setns
> ffffffff8105b78b T sys_setns
> root@debian:~/github/libvirt# ./configure | grep setns
> checking for setns... no
>  
> What the problem really is ? How can I fix this problem?
What's the result of grep -R "setns" /usr/include/*


Hi Gaofeng,
The result you want is as following:

root@debian:~/github/libvirt# grep -R "setns" /usr/include/*
/usr/include/asm-generic/unistd.h:#define __NR_setns 268
/usr/include/asm-generic/unistd.h:__SYSCALL(__NR_setns, sys_setns)
/usr/include/x86_64-linux-gnu/bits/syscall.h:#define SYS_setns __NR_setns
/usr/include/x86_64-linux-gnu/asm/unistd_64.h:#define __NR_setns                
308
/usr/include/x86_64-linux-gnu/asm/unistd_64.h:__SYSCALL(__NR_setns, sys_setns)
/usr/include/x86_64-linux-gnu/asm/unistd_32.h:#define __NR_setns               
346

------------------     
Best regards!
GuanQiang
13:21:12


------------------     
Best regards!
GuanQiang
14:25:56

On 12/09/2013 02:29 PM, hzguanqiang@corp.netease.com
wrote:
> Hi Gaofeng,
> It seems that I've got the answer.
> In manual page about setns, it said that library support was added to glibc
> in version 2.14 while my libc version is 2.13.
>  
Good news :)
> Thanks for help anyway.
>  
> On 2013-12-09 13:22 , hzguanqiang@corp.netease.com
<mailto:hzguanqiang@corp.netease.com> wrote:
> 
>     On 2013-12-09 13:18 , Gao feng <mailto:gaofeng@cn.fujitsu.com>
wrote:
> 
>         On 12/09/2013 01:06 PM, hzguanqiang@corp.netease.com wrote:
>         > Hi experts,
>         > 
>         > When I test lxc container with lxc-enter-namespace command, It
reported an error as
>         > following:
>         > root@debian:~/github/libvirt# vir lxc-enter-namespace lxc
--noseclabel /bin/df -hl
>         > error: Cannot get namespaces for 3145: Function not
implemented
>         > 
>         > It seems that setns is not supported by my kernel.
>         > 
>         > But from the following info, It seemed the reason is just
libvirt/autoconf doesn't
>         > recgonise setns.
>         > root@debian:~/github/libvirt# grep setns /proc/kallsyms
>         > ffffffff8105b78b T SyS_setns
>         > ffffffff8105b78b T sys_setns
>         > root@debian:~/github/libvirt# ./configure | grep setns
>         > checking for setns... no
>         > 
>         > What the problem really is ? How can I fix this problem?
>          
>         What's the result of grep -R "setns" /usr/include/*
>          
> 
>     Hi Gaofeng,
>     The result you want is as following:
>      
>     root@debian:~/github/libvirt# grep -R "setns" /usr/include/*
>     /usr/include/asm-generic/unistd.h:#define __NR_setns 268
>     /usr/include/asm-generic/unistd.h:__SYSCALL(__NR_setns, sys_setns)
>     /usr/include/x86_64-linux-gnu/bits/syscall.h:#define SYS_setns
__NR_setns
>     /usr/include/x86_64-linux-gnu/asm/unistd_64.h:#define __NR_setns       
308
>     /usr/include/x86_64-linux-gnu/asm/unistd_64.h:__SYSCALL(__NR_setns,
sys_setns)
>     /usr/include/x86_64-linux-gnu/asm/unistd_32.h:#define __NR_setns       
346
>      
>     ------------------    
>     Best regards!
>     GuanQiang
>     13:21:12
> 
>  
> ------------------    
> Best regards!
> GuanQiang
> 14:25:56