[Bug nscd/14906] New: inotify failed when /etc/hosts file change

["binli at opensuse dot org" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14906

             Bug #: 14906
           Summary: inotify failed when /etc/hosts file change
           Product: glibc
           Version: 2.11
            Status: NEW
          Severity: normal
          Priority: P2
         Component: nscd
        AssignedTo: unassigned@sourceware.org
        ReportedBy: binli@opensuse.org
                CC: drepper.fsp@gmail.com
    Classification: Unclassified


Created attachment 6770
  --> http://sourceware.org/bugzilla/attachment.cgi?id=6770
The test program

This test program shows the problem.  I'm creating a watch on /etc/hosts
(looking for modification or deletion), and it's catching only changes of 
the type "echo '#bla' >> /etc/hosts".  It doesn't catch changes via copy
to temporary file, do changes, rename temp file back to /etc/hosts.  That's
what sed -i is using to atomically do the in place changes.

I thought that adding IN_MOVE should help when setting up the watch,
but it doesn't (commented out in the test program).  Even if it would have
helped I would claim the kernel to be broken.  If I include IN_MODIFY
in a watch for /etc/hosts, I'm of course also interested if somebody renames
some random file to the watched filename, as it very certainly is a
modification.

Basically as soon as "sed -i" is done on the file the kernel lost track
of the watch and no changes to the "new" /etc/hosts are tracked anymore.

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