diff options
| author | Len Brown <len.brown@intel.com> | 2009-01-09 03:39:43 -0500 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2009-01-09 03:39:43 -0500 |
| commit | b2576e1d4408e134e2188c967b1f28af39cd79d4 (patch) | |
| tree | 004f3c82faab760f304ce031d6d2f572e7746a50 /include/linux/pid.h | |
| parent | 3cc8a5f4ba91f67bbdb81a43a99281a26aab8d77 (diff) | |
| parent | 2150edc6c5cf00f7adb54538b9ea2a3e9cedca3f (diff) | |
Merge branch 'linus' into release
Diffstat (limited to 'include/linux/pid.h')
| -rw-r--r-- | include/linux/pid.h | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/include/linux/pid.h b/include/linux/pid.h index d7e98ff8021..49f1c2f66e9 100644 --- a/include/linux/pid.h +++ b/include/linux/pid.h @@ -123,6 +123,24 @@ extern struct pid *alloc_pid(struct pid_namespace *ns); extern void free_pid(struct pid *pid); /* + * ns_of_pid() returns the pid namespace in which the specified pid was + * allocated. + * + * NOTE: + * ns_of_pid() is expected to be called for a process (task) that has + * an attached 'struct pid' (see attach_pid(), detach_pid()) i.e @pid + * is expected to be non-NULL. If @pid is NULL, caller should handle + * the resulting NULL pid-ns. + */ +static inline struct pid_namespace *ns_of_pid(struct pid *pid) +{ + struct pid_namespace *ns = NULL; + if (pid) + ns = pid->numbers[pid->level].ns; + return ns; +} + +/* * 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; @@ -147,9 +165,9 @@ pid_t pid_vnr(struct pid *pid); #define do_each_pid_task(pid, type, task) \ do { \ struct hlist_node *pos___; \ - if (pid != NULL) \ + if ((pid) != NULL) \ hlist_for_each_entry_rcu((task), pos___, \ - &pid->tasks[type], pids[type].node) { + &(pid)->tasks[type], pids[type].node) { /* * Both old and new leaders may be attached to |