[CRIU] [PATCH 4/7] dump: Do save thread blocked signals in a parasite memory

[Cyrill Gorcunov]

Once we seized the thread we need to save a copy of blocked
signals in parasite memory, just like it's done for a thread
leader task.

This patch does exactly that -- we call for parasite_init_threads_seized
helper which tells parasite to save blocked signal mask, then
we fetch the data specific to thread with parasite_dump_thread_seized.

Note since it's not longer just @tid and @tid_addr fetched from the
parasite, I've renamed PARASITE_CMD_DUMP_TID_ADDR to
PARASITE_CMD_DUMP_THREAD, because it's already too many characteristics
we're fetching and likely it'll be extened even more in future.

Use parasite_init_threads_seized helper which walks over
all threads (except a leader, which already saved at infection
time) and saves blocked signals mask in parasite memory.

Signed-off-by: Cyrill Gorcunov <gorcunov at openvz.org>
---
 cr-dump.c                  |   16 +++++++++++++---
 include/parasite-syscall.h |    8 ++++++--
 include/parasite.h         |    8 +++++---
 parasite-syscall.c         |   33 +++++++++++++++++++++++++++++----
 parasite.c                 |   31 ++++++++++++++++++++++++++++---
 5 files changed, 81 insertions(+), 15 deletions(-)

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