Changes

=== External TTYs ===

=== External TTYs ===

The format of tty id is <code>tty[''rdev'':''dev'']</code>. Why can we not use a pair of <code>mnt_id</code> and <code>inode</code> here?

The format of tty id is <code>tty[''rdev'':''dev'']</code>. Note that a pair of <code>''mnt_id'':''inode''</code> is not used here, as there can be two device files with the same <code>''rdev''</code> but different inode numbers.

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<pre>

     $ ipython

     # setsid --ctty ipython

     In [1]: import os

     In [1]: import os

     In [2]: st = os.stat("/proc/self/fd/0")

     In [2]: st = os.stat("/proc/self/fd/0")

     In [3]: print "tty[%x:%x]" % (st.st_rdev, st.st_dev)

     In [3]: print("tty[%x:%x]" % (st.st_rdev, st.st_dev))

     tty:[8800:d]

     tty[8802:19]

     # criu dump -t `pgrep ipython` --external 'tty[8802:19]'

     # criu restore --inherit-fd 'fd[1]:tty[8802:19]'

      

    $ ./criu dump --external 'tty[8800:d]' -D imgs -v4 -t 4109

     $ ./criu restore --inherit-fd 'fd[1]:tty[8800:d]' -D imgs -v4

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</pre>