On Tue, 2011-12-13 at 09:49 +0800, yi...@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. >
Hi Xiaobiao, What you say was true a long time ago, but the SCM_CREDENTIALS feature is pid namespace aware since 2.6.35: a struct cred in the kernel holds a ref to a struct pid instead of a pid_t. The appropriate numerical pid is returned to the caller of recvmsg() according to the following path: unix_stream_recvmsg()->scm_set_cred()->cred_to_ucred() Unless you run an older kernel, you can safely rely on unix sockets to perform pid translation from the container to the host. Cheers. > Cheers > Xiaobiao > ----- 原邮件 ----- > 从: Greg Kurz <gk...@fr.ibm.com> > 日期: 星期一, 十二月 12日, 2011 下午6:08 > 主题: Re: [lxc-devel] How to change to lxc internal PID to system wide > PID > > > On Mon, 2011-12-12 at 11:01 +0800, yi...@neusoft.com wrote: > > > Hi all > > > > > > These days I encouter a problem. > > > When I use the lxc to running my app,the getpid() system call > > > returns 2.But in my platform, > > > I need the system wide PID instead for some purpose,such as > > > integrade with native app(not running in lxc). > > > (I want to integrade the lxc app in my platform to do > > isolation,and > > > use the dbus for IPC) > > > So how to solve this conflict?Can anyone give me a hint? > > > > > > Thanks for your time. > > > > > > Cheers > > > Xiaobiao > > > > Hi Xiaobiao, > > > > This is a recurring need from the lxc community... For the moment, > the > > only kernel service that provides PID conversions is 'ancillary > > messageson AF_UNIX sockets'. Look for SCM_CREDENTIALS in unix(7). > > All you need > > is connected unix socket between your container and the host system. > > > > Cheers. > > > > -- > > Gregory Kurz gk...@fr.ibm.com > > Software Engineer @ IBM/Meiosys http://www.ibm.com > > Tel +33 (0)534 638 479 Fax +33 (0)561 > > 400 420 > > > > "Anarchy is about taking complete responsibility for yourself." > > Alan Moore. > > > > > --------------------------------------------------------------------------------------------------- > Confidentiality Notice: The information contained in this e-mail and any > accompanying attachment(s) > is intended only for the use of the intended recipient and may be > confidential and/or privileged of > Neusoft Corporation, its subsidiaries and/or its affiliates. If any reader of > this communication is > not the intended recipient, unauthorized use, forwarding, printing, storing, > disclosure or copying > is strictly prohibited, and may be unlawful.If you have received this > communication in error,please > immediately notify the sender by return e-mail, and delete the original > message and all copies from > your system. Thank you. > --------------------------------------------------------------------------------------------------- -- Gregory Kurz gk...@fr.ibm.com Software Engineer @ IBM/Meiosys http://www.ibm.com Tel +33 (0)534 638 479 Fax +33 (0)561 400 420 "Anarchy is about taking complete responsibility for yourself." Alan Moore. ------------------------------------------------------------------------------ Systems Optimization Self Assessment Improve efficiency and utilization of IT resources. Drive out cost and improve service delivery. Take 5 minutes to use this Systems Optimization Self Assessment. http://www.accelacomm.com/jaw/sdnl/114/51450054/ _______________________________________________ Lxc-devel mailing list Lxc-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lxc-devel
