[CRIU] [PATCH 1/4] tty: Prepare some members for tty merge

[Cyrill Gorcunov]

This commit introduce some service members
which will be used in future commit. This is
done to simplify overall patching procedure
and bisection.

In particular, we introduce

 - TTY file type, we will need to to describe
   tty file entries

 - CTL_TTY_OFF service fd. This fd will help us
   to create control terminal. We need a special fd
   number for it, because control terminal is to be
   restored in context of a process which sid matches
   the terminal has.

 - ctl_tty_id, this id will carry the control terminal
   id bound to the process which sid matches. The key is
   the following: CTL_TTY_OFF fd stacked on process item
   which has ctl_tty_id set thus file engine will restore
   contol terminal in proper task context.

Signed-off-by: Cyrill Gorcunov <gorcunov at openvz.org>
---
 include/crtools.h     |    1 +
 include/pstree.h      |    1 +
 protobuf/fdinfo.proto |    1 +
 3 files changed, 3 insertions(+), 0 deletions(-)

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