Hi Mike, On 10/06/2016 07:23 PM, Mike Frysinger wrote: > If the target process is in a different mount namespace, the root symlink > actually shows that view of the filesystem. As an example: > /* Terminal 1 */ > $ unshare -Urnm > # mount -t tmpfs tmpfs /etc > # mount --bind /bin /dev > # echo $$ > 17168 > > /* Terminal 2 */ > # ls /etc # Normal view of /etc files. > # ls /proc/17168/root/etc # Empty view of the tmpfs. > # ls /dev # Normal view of /dev files. > # ls /proc/17168/root/dev # Contents of /bin files. Thanks for the patch! And thanks for the commit message, which is I think actually useful text for the man page itself, so I added it (in somewhat modified form) to the page itself. Cheers, Michael > Signed-off-by: Mike Frysinger <vapier@xxxxxxxxxx> > --- > v2 > - restore examples > > man5/proc.5 | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/man5/proc.5 b/man5/proc.5 > index 3a5f4407c657..0680902c54a5 100644 > --- a/man5/proc.5 > +++ b/man5/proc.5 > @@ -1513,6 +1513,10 @@ root directory, and behaves in the same way as > and > .IR fd/* . > > +Note however that this file is not merely a symlink. > +It provides the same view of the filesystem (including namespaces and the > +set of per-process mounts) as the process itself. > + > .\" The following was still true as at kernel 2.6.13 > In a multithreaded process, the contents of this symbolic link > are not available if the main thread has already terminated > -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/ -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
