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| author | Tejun Heo <tj@kernel.org> | 2011-06-17 16:50:40 +0200 |
|---|---|---|
| committer | Oleg Nesterov <oleg@redhat.com> | 2011-06-22 19:26:29 +0200 |
| commit | 06d984737bac0545fe20bb5447ee488b95adb531 (patch) | |
| tree | b8d89d21a53c28a025dd42598bc3406e25db5ba8 /include/linux/ptrace.h | |
| parent | 4b9d33e6d83cc05a8005a8f9a8b9677fa0f53626 (diff) | |
| download | lwn-06d984737bac0545fe20bb5447ee488b95adb531.tar.gz lwn-06d984737bac0545fe20bb5447ee488b95adb531.zip | |
ptrace: s/tracehook_tracer_task()/ptrace_parent()/
tracehook.h is on the way out. Rename tracehook_tracer_task() to
ptrace_parent() and move it from tracehook.h to ptrace.h.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: John Johansen <john.johansen@canonical.com>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Diffstat (limited to 'include/linux/ptrace.h')
| -rw-r--r-- | include/linux/ptrace.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h index b546fd6c3506..bb157bdd0c55 100644 --- a/include/linux/ptrace.h +++ b/include/linux/ptrace.h @@ -151,6 +151,24 @@ int generic_ptrace_pokedata(struct task_struct *tsk, unsigned long addr, unsigned long data); /** + * ptrace_parent - return the task that is tracing the given task + * @task: task to consider + * + * Returns %NULL if no one is tracing @task, or the &struct task_struct + * pointer to its tracer. + * + * Must called under rcu_read_lock(). The pointer returned might be kept + * live only by RCU. During exec, this may be called with task_lock() held + * on @task, still held from when check_unsafe_exec() was called. + */ +static inline struct task_struct *ptrace_parent(struct task_struct *task) +{ + if (unlikely(task->ptrace)) + return rcu_dereference(task->parent); + return NULL; +} + +/** * ptrace_event_enabled - test whether a ptrace event is enabled * @task: ptracee of interest * @event: %PTRACE_EVENT_* to test |