[CRIU] [PATCH 3/3] parasite-syscall: Provide unified parasite_execute[_by_pid]() helpers

[Cyrill Gorcunov]

Once we have parasite_ctl::state initialized we can choose
which way to use for message delivery to a parasite code
automatically.

Thus get rid of parasite_execute_trap, parasite_execute_trap,
parasite_execute_daemon_by_pid, parasite_execute_daemon helpers
but instead provide unified parasite_execute procedure. This
hides internal details from caller, and caller don't need to
worry how exactly message is delivered to a parasite code.

Still there are a couple of commands which are exceptions from
general rule: parasite_init_threads_seized() and parasite_fini_seized()
simply because they are changing an internal behaviour of a daemon.

This approach allows to do a proper rollback in case if parasite
infection failed, or some error happens during main crtools module
lifetime.

Note the whole "daemon approach" do not implies "self-cure" mechanism
implemented (via rt-sigreturn and such in daemon code), this is
another task to be done.

Signed-off-by: Cyrill Gorcunov <gorcunov at openvz.org>
---
 parasite-syscall.c | 73 +++++++++++++++++++++++++++---------------------------
 1 file changed, 37 insertions(+), 36 deletions(-)

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