scripts/gdb: add helper and convenience function to look up tasks
Add the helper task_by_pid that can look up a task by its PID. Also export it as a convenience function. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jason Wessel <jason.wessel@windriver.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Ben Widawsky <ben@bwidawsk.net> Cc: Borislav Petkov <bp@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -44,3 +44,30 @@ class TaskList:
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utils.container_of(t['thread_group']['next'],
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utils.container_of(t['thread_group']['next'],
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self.task_ptr_type, "thread_group")
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self.task_ptr_type, "thread_group")
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return t
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return t
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def get_task_by_pid(pid):
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for task in TaskList():
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if int(task['pid']) == pid:
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return task
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return None
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class LxTaskByPidFunc(gdb.Function):
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"""Find Linux task by PID and return the task_struct variable.
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$lx_task_by_pid(PID): Given PID, iterate over all tasks of the target and
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return that task_struct variable which PID matches."""
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def __init__(self):
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super(LxTaskByPidFunc, self).__init__("lx_task_by_pid")
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def invoke(self, pid):
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task = get_task_by_pid(pid)
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if task:
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return task.dereference()
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else:
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raise gdb.GdbError("No task of PID " + str(pid))
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LxTaskByPidFunc()
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@ -26,3 +26,4 @@ else:
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import linux.symbols
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import linux.symbols
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import linux.modules
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import linux.modules
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import linux.dmesg
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import linux.dmesg
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import linux.tasks
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