On Tue, Jul 26, 2016 at 11:32:25AM -0700, W. Trevor King wrote: > On Tue, Jul 26, 2016 at 11:25:24AM -0700, Andrew Vagin wrote: > > Sure. If a process wants to compare two namespaces, it needs to get file > > descriptors for them (open /proc/PID/ns/XXX, use new ioctl-s, find a > > process which has them), > > and then it calls kcmp(pid1, pid2, KCMP_NSFD, ns_fd1, ns_fd2) > > If you use the new ioctl-s to get ns_fd2, do you walk your local /proc > to find pid2? If you use the new ioctl-s to get nf_fd2, you will have it in the current process, so pid2 will be getpid(). pidX identifies a process where to find fdX. man 2 kcmp: The kcmp() system call can be used to check whether the two processes identified by pid1 and pid2 share a kernel resource such as virtual memory, file descriptors, and so on. > > Cheers, > Trevor > > -- > This email may be signed or encrypted with GnuPG (http://www.gnupg.org). > For more information, see http://en.wikipedia.org/wiki/Pretty_Good_Privacy -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
