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:
quoted
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
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