Re: Question about setns recognising in libvirt autoconf

"hzguanqiang@xxxxxxxxxxxxxxxx" <hzguanqiang@xxxxxxxxxxxxxxxx> · Mon, 9 Dec 2013 14:29:44 +0800

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@xxxxxxxxxxxxxxxx wrote:

        On 2013-12-09 13:18 , Gao feng wrote:

                On 12/09/2013 01:06 PM, hzguanqiang@xxxxxxxxxxxxxxxx 
                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
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