[lxc-devel] Default Namespace

[Maheswara Reddy C - ERS, HCL Tech]

Hi,
How can we create common default namespace which can be communicated with all the other namespaces.
(I mean, all the namespaces will communicate with external system via default namespace)
Main() is considered as a default namespace.

Thanks
Mahesh

-----Original Message-----
From: Daniel Lezcano [mailto:daniel.lezcano at free.fr]
Sent: Tuesday, February 22, 2011 5:26 PM
To: Maheswara Reddy C - ERS, HCL Tech
Cc: lxc-devel at lists.sourceforge.net
Subject: Re: [lxc-devel] do pid1 and pid2 run in the same network namespace

On 02/22/2011 12:22 PM, Maheswara Reddy C - ERS, HCL Tech wrote:
>> Then it is quite easy. You just have to fork ten times the routine in the program I gave you in the previous email.
>   Hi Daniel,
>
> But I want to run two different (fork() run same copy) process/threads in each namespace, that's why I am using clone() which take function pointer of each process/thered to start.

Have fun ;)

#include<errno.h>
#include<sched.h>
#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>
#include<sys/types.h>
#include<sys/wait.h>

#define NRNS 10

int myroutine1(void)
{
        return 0;
}

int myroutine2(void)
{
        return 0;
}

int main(int argc, char *argv[])
{

        int i;
        pid_t pid;

        for (i = 0; i<  NRNS; i++) {

                /* create a new network namespace for my childs */
                if (unshare(CLONE_NEWNET)) {
                        perror("unshare");
                        return 1;
                }

                pid = fork();
                if (pid<  0) {
                        perror("fork");
                        return 1;
                }

                if (!pid)
                        exit(myroutine1());

                pid = fork();
                if (pid<  0) {
                        perror("fork2");
                        return 1;
                }

                if (!pid)
                        exit(myroutine2());

        }

        /* create a new netns to not share with the last one
         * At the end we have 10 netns + 1 this one
         */
        if (unshare(CLONE_NEWNET)) {
                perror("unshare2");
                return 1;
        }

        for (;;) {

                pid = wait(NULL);
                if (pid<  0) {
                        if (errno == ECHILD)
                                return 0;
                        if (errno == EINTR)
                                continue;
                        perror("wait");
                        return 1;
                 }
        }

}



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