Got it, thanks.

Serge E. Hallyn wrote:
> otherwise glibc caches getpid() result and we put the parent
> process in the new cgroup, in the case of 'nsexec -cg /bin/sleep 10'
> 
> Signed-off-by: Serge Hallyn <[email protected]>
> ---
>  nsexec.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/nsexec.c b/nsexec.c
> index 3a825f1..79fcc70 100644
> --- a/nsexec.c
> +++ b/nsexec.c
> @@ -154,7 +154,7 @@ int move_to_new_cgroup(int newcgroup)
>       fout = fopen(tasksfname, "w");
>       if (!fout)
>               return 0;
> -     fprintf(fout, "%d\n", getpid());
> +     fprintf(fout, "%d\n", syscall(__NR_getpid));
>       fclose(fout);
>       return 1;
>  }
> @@ -193,7 +193,7 @@ int do_child(void *vargv)
>  
>       /* if pid == 1 then remount /proc */
>       /* But if the container has no /proc don't fret */
> -     if (getpid() == 1) {
> +     if (syscall(__NR_getpid) == 1) {
>               umount2("/proc", MNT_DETACH);
>               mount("proc", "/proc", "proc", 0, NULL);
>       }
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