Messages in this thread Patch in this message | | | Date | Sat, 20 Dec 2008 16:53:54 -0800 | From | Sukadev Bhattiprolu <> | Subject | [RFC][PATCH 3/6][v3] Define/set SIGNAL_UNKILLABLE_FROM_NS |
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From: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Date: Sat, 20 Dec 2008 12:27:47 -0800 Subject: [RFC][PATCH 3/6][v3] Define/set SIGNAL_UNKILLABLE_FROM_NS
Define and set the SIGNAL_UNKILLABLE_FROM_NS flags for container-inits. This flag will be used in follow-on patches to ignore/drop fatal sigals to container-init from within the container but process the signals from an ancestor container.
Based on discussions on earlier version of this patchset: http://lkml.org/lkml/2008/11/25/462
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> --- include/linux/sched.h | 3 +++ kernel/fork.c | 2 ++ 2 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h index 96c6703..19c4311 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -604,6 +604,9 @@ struct signal_struct { #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ +/* for container-init: ignore fatal signals from within container */ +#define SIGNAL_UNKILLABLE_FROM_NS 0x00000080 + /* If true, all threads except ->group_exit_task have pending SIGKILL */ static inline int signal_group_exit(const struct signal_struct *sig) { diff --git a/kernel/fork.c b/kernel/fork.c index dba2d3f..0a959f5 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -812,6 +812,8 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk) atomic_set(&sig->live, 1); init_waitqueue_head(&sig->wait_chldexit); sig->flags = 0; + if (clone_flags & CLONE_NEWPID) + sig->flags |= SIGNAL_UNKILLABLE_FROM_NS; sig->group_exit_code = 0; sig->group_exit_task = NULL; sig->group_stop_count = 0; -- 1.5.2.5
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