[libvirt-users] Question about setns recognising in libvirt autoconf

[Gao feng]

On 12/09/2013 02:29 PM, hzguanqiang at 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 at corp.netease.com <mailto:hzguanqiang at corp.netease.com> wrote:
> 
>     On 2013-12-09 13:18 , Gao feng <mailto:gaofeng at cn.fujitsu.com> wrote:
> 
>         On 12/09/2013 01:06 PM, hzguanqiang at corp.netease.com wrote:
>         > Hi experts,
>         > 
>         > When I test lxc container with lxc-enter-namespace command, It reported an error as
>         > following:
>         > root at 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 at debian:~/github/libvirt# grep setns /proc/kallsyms
>         > ffffffff8105b78b T SyS_setns
>         > ffffffff8105b78b T sys_setns
>         > root at 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 at 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