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authorScott James Remnant <scott@ubuntu.com>2009-09-22 16:43:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-23 07:39:29 -0700
commit02b51df1b07b4e9ca823c89284e704cadb323cd1 (patch)
treec68de4809f261d742f597c686826cdc9d047fb4a /drivers/connector
parent88e9d34c727883d7d6f02cf1475b3ec98b8480c7 (diff)
downloadkernel-02b51df1b07b4e9ca823c89284e704cadb323cd1.tar.gz
proc connector: add event for process becoming session leader
The act of a process becoming a session leader is a useful signal to a supervising init daemon such as Upstart. While a daemon will normally do this as part of the process of becoming a daemon, it is rare for its children to do so. When the children do, it is nearly always a sign that the child should be considered detached from the parent and not supervised along with it. The poster-child example is OpenSSH; the per-login children call setsid() so that they may control the pty connected to them. If the primary daemon dies or is restarted, we do not want to consider the per-login children and want to respawn the primary daemon without killing the children. This patch adds a new PROC_SID_EVENT and associated structure to the proc_event event_data union, it arranges for this to be emitted when the special PIDTYPE_SID pid is set. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Scott James Remnant <scott@ubuntu.com> Acked-by: Matt Helsley <matthltc@us.ibm.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Acked-by: "David S. Miller" <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/connector')
-rw-r--r--drivers/connector/cn_proc.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/connector/cn_proc.c b/drivers/connector/cn_proc.c
index 85e5dc0431fe..abf4a2529f80 100644
--- a/drivers/connector/cn_proc.c
+++ b/drivers/connector/cn_proc.c
@@ -139,6 +139,31 @@ void proc_id_connector(struct task_struct *task, int which_id)
cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
}
+void proc_sid_connector(struct task_struct *task)
+{
+ struct cn_msg *msg;
+ struct proc_event *ev;
+ struct timespec ts;
+ __u8 buffer[CN_PROC_MSG_SIZE];
+
+ if (atomic_read(&proc_event_num_listeners) < 1)
+ return;
+
+ msg = (struct cn_msg *)buffer;
+ ev = (struct proc_event *)msg->data;
+ get_seq(&msg->seq, &ev->cpu);
+ ktime_get_ts(&ts); /* get high res monotonic timestamp */
+ put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
+ ev->what = PROC_EVENT_SID;
+ ev->event_data.sid.process_pid = task->pid;
+ ev->event_data.sid.process_tgid = task->tgid;
+
+ memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
+ msg->ack = 0; /* not used */
+ msg->len = sizeof(*ev);
+ cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
+}
+
void proc_exit_connector(struct task_struct *task)
{
struct cn_msg *msg;