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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