[lxc-devel] 回复 :Re: 回复 :Re: How to change to lxc internal PID to system wide PID

[yinxb at neusoft.com]

Hi 
   Thanks,It is exactly what I want.

----- 原邮件 -----
从: Cedric Le Goater <legoater at free.fr>
日期: 星期二, 十二月 13日, 2011 下午4:10
主题: Re: [lxc-devel] 回复 :Re:  How to change to lxc internal PID to 
system wide PID

> On 12/13/2011 02:49 AM, yinxb at neusoft.com wrote:
> > Hi Gregory Kurz
> > 
> >    From the google search,SCM_CREDENTIALS contains the PID of 
> the 
> > sender process,in the sender's
> > PID namespace.
> >    So if the lxc App acts as the sender, the PID is 2 which is 
> also 
> > invalid for the host. 
> > (lxc has its own PID namesapce)
> >    Correct me if wrong,thanks.
> 
> the pid in 'struct ucred' will be translated in the pid namespace of
> the receiving side.
> 
> on the host, run the receiving side  : 
> 
> 
	http://man7.org/tlpi/code/online/dist/sockets/scm_cred_recv.c
.html
> 
> 	$ ./scm_cred_recv 
> 	Receiving via stream socket
> 	recvmsg() returned 4
> 	Received data = 12345
> 	Received credentials pid=20333, uid=1017, gid=100
> 	Credentials from SO_PEERCRED: pid=20333, euid=1017, egid=100
> 
> 
> and in an lxc (application) container, run the sending side : 
> 
> 
	http://man7.org/tlpi/code/online/dist/sockets/scm_cred_send.c
.html
> 
> 	$ lxc-execute -n foo -- ./scm_cred_send
> 	Send credentials pid=2, uid=1017, gid=100
> 	sendmsg() returned 4
> 
> Regards,
> 
> C.
> 
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