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authorPavel Emelyanov <xemul@openvz.org>2007-10-19 10:40:06 +0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-19 22:53:39 +0400
commit7af5729474b5b8ad385adadab78d6e723e7655a3 (patch)
tree197f8da3e7afd65554f0c0a070eb93036b720fa8 /include/linux/pid.h
parent8ef047aaaeb811247a5639c92e2f2ae1221a28dd (diff)
downloadlinux-7af5729474b5b8ad385adadab78d6e723e7655a3.tar.xz
pid namespaces: helpers to obtain pid numbers
When showing pid to user or getting the pid numerical id for in-kernel use the value of this id may differ depending on the namespace. This set of helpers is used to get the global pid nr, the virtual (i.e. seen by task in its namespace) nr and the nr as it is seen from the specified namespace. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com> Cc: Paul Menage <menage@google.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/pid.h')
-rw-r--r--include/linux/pid.h24
1 files changed, 23 insertions, 1 deletions
diff --git a/include/linux/pid.h b/include/linux/pid.h
index 67470ade3212..c5fee61bfb4f 100644
--- a/include/linux/pid.h
+++ b/include/linux/pid.h
@@ -114,11 +114,33 @@ extern struct pid *find_ge_pid(int nr);
extern struct pid *alloc_pid(struct pid_namespace *ns);
extern void FASTCALL(free_pid(struct pid *pid));
+/*
+ * the helpers to get the pid's id seen from different namespaces
+ *
+ * pid_nr() : global id, i.e. the id seen from the init namespace;
+ * pid_vnr() : virtual id, i.e. the id seen from the namespace this pid
+ * belongs to. this only makes sence when called in the
+ * context of the task that belongs to the same namespace;
+ * pid_nr_ns() : id seen from the ns specified.
+ *
+ * see also task_xid_nr() etc in include/linux/sched.h
+ */
+
static inline pid_t pid_nr(struct pid *pid)
{
pid_t nr = 0;
if (pid)
- nr = pid->nr;
+ nr = pid->numbers[0].nr;
+ return nr;
+}
+
+pid_t pid_nr_ns(struct pid *pid, struct pid_namespace *ns);
+
+static inline pid_t pid_vnr(struct pid *pid)
+{
+ pid_t nr = 0;
+ if (pid)
+ nr = pid->numbers[pid->level].nr;
return nr;
}