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| author | Scott James Remnant <scott@ubuntu.com> | 2009-09-22 16:43:44 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-23 07:39:29 -0700 |
| commit | 02b51df1b07b4e9ca823c89284e704cadb323cd1 (patch) | |
| tree | c68de4809f261d742f597c686826cdc9d047fb4a /include/linux | |
| parent | 88e9d34c727883d7d6f02cf1475b3ec98b8480c7 (diff) | |
| download | kernel-common-02b51df1b07b4e9ca823c89284e704cadb323cd1.tar.gz kernel-common-02b51df1b07b4e9ca823c89284e704cadb323cd1.tar.bz2 kernel-common-02b51df1b07b4e9ca823c89284e704cadb323cd1.zip | |
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 'include/linux')
| -rw-r--r-- | include/linux/cn_proc.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/cn_proc.h b/include/linux/cn_proc.h index b8125b2eb665..47dac5ea8d3a 100644 --- a/include/linux/cn_proc.h +++ b/include/linux/cn_proc.h @@ -52,6 +52,7 @@ struct proc_event { PROC_EVENT_EXEC = 0x00000002, PROC_EVENT_UID = 0x00000004, PROC_EVENT_GID = 0x00000040, + PROC_EVENT_SID = 0x00000080, /* "next" should be 0x00000400 */ /* "last" is the last process event: exit */ PROC_EVENT_EXIT = 0x80000000 @@ -89,6 +90,11 @@ struct proc_event { } e; } id; + struct sid_proc_event { + __kernel_pid_t process_pid; + __kernel_pid_t process_tgid; + } sid; + struct exit_proc_event { __kernel_pid_t process_pid; __kernel_pid_t process_tgid; @@ -102,6 +108,7 @@ struct proc_event { void proc_fork_connector(struct task_struct *task); void proc_exec_connector(struct task_struct *task); void proc_id_connector(struct task_struct *task, int which_id); +void proc_sid_connector(struct task_struct *task); void proc_exit_connector(struct task_struct *task); #else static inline void proc_fork_connector(struct task_struct *task) @@ -114,6 +121,9 @@ static inline void proc_id_connector(struct task_struct *task, int which_id) {} +static inline void proc_sid_connector(struct task_struct *task) +{} + static inline void proc_exit_connector(struct task_struct *task) {} #endif /* CONFIG_PROC_EVENTS */ |