linux-kernel - Re: Attaching PID 0 to a cgroup

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Date:	Thu, 3 Jul 2008 15:03:05 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	"Matt Helsley" <matthltc@...ibm.com>
Cc:	"Dhaval Giani" <dhaval@...ux.vnet.ibm.com>,
	"Andrea Righi" <righi.andrea@...il.com>,
	"Li Zefan" <lizf@...fujitsu.com>,
	lkml <linux-kernel@...r.kernel.org>,
	"Sudhir Kumar" <skumar@...ux.vnet.ibm.com>,
	containers@...ts.osdl.org,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: Attaching PID 0 to a cgroup

On Thu, Jul 3, 2008 at 2:59 PM, Matt Helsley <matthltc@...ibm.com> wrote:
> ------------
>        char buffer[16];
>        int fd;
>
>        fd = open("/some/cgroup/tasks", O_WRONLY);
>
>        /*
>         * These two writes produce the same effect: adding this process
>         * to /some/cgroup.
>         */
>        if (the_slightly_shorter_way)
>                write(fd, "0", 2);
>        else {
>                /* The slightly-less-short way */
>                snprintf(buffer, 16, "%u", getpid());
>                write(fd, buffer, strlen(buffer));

If it's a threaded application, then you'd need gettid() rather than
getpid() for the two to be equivalent.

Paul
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