[PATCH] Introduce ActivePid: in /proc/self/status (v2, was Vpid:)
Greg Kurz
gkurz at fr.ibm.com
Thu Jun 16 08:33:32 PDT 2011
On Thu, 2011-06-16 at 08:07 -0700, Eric W. Biederman wrote:
> > Finally, we thought that the 'ActivePid' information was interesting
> > enough to be exposed in /proc and was solving the case we're facing
> > rather easily with some framework (cgroups) in user space.
>
> The pid number by which a process knows itself doesn't seem
> unreasonable. I'm not totally
>
> After having a second look at the code in proc we already have
> a reference to the struct pid we want to print. So simply
> printing
> pid->numbers[pid->level].nr
> seems reasonable, and race free.
>
> Alternatively that could be written.
> pid_nr_ns(pid, ns_of_pid(pid));
>
> Eric
So we end up with the following, since pid is valid:
diff --git a/fs/proc/array.c b/fs/proc/array.c
index 5e4f776..b7316cc 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -183,12 +183,14 @@ static inline void task_state(struct seq_file *m,
struct pid_namespace *ns,
"Pid:\t%d\n"
"PPid:\t%d\n"
"TracerPid:\t%d\n"
+ "ActivePid:\t%d\n"
"Uid:\t%d\t%d\t%d\t%d\n"
"Gid:\t%d\t%d\t%d\t%d\n",
get_task_state(p),
task_tgid_nr_ns(p, ns),
pid_nr_ns(pid, ns),
ppid, tpid,
+ pid_nr_ns(pid, ns_of_pid(pid)),
cred->uid, cred->euid, cred->suid, cred->fsuid,
cred->gid, cred->egid, cred->sgid, cred->fsgid);
--
Gregory Kurz gkurz at fr.ibm.com
Software Engineer @ IBM/Meiosys http://www.ibm.com
Tel +33 (0)534 638 479 Fax +33 (0)561 400 420
"Anarchy is about taking complete responsibility for yourself."
Alan Moore.
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