]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
proc connector: add event for process becoming session leader
authorScott James Remnant <scott@ubuntu.com>
Tue, 22 Sep 2009 23:43:44 +0000 (16:43 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 23 Sep 2009 14:39:29 +0000 (07:39 -0700)
commit02b51df1b07b4e9ca823c89284e704cadb323cd1
treec68de4809f261d742f597c686826cdc9d047fb4a
parent88e9d34c727883d7d6f02cf1475b3ec98b8480c7
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>
drivers/connector/cn_proc.c
include/linux/cn_proc.h
kernel/exit.c