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4752871081
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>
73 lines
1.9 KiB
Python
73 lines
1.9 KiB
Python
#
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# gdb helper commands and functions for Linux kernel debugging
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#
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# task & thread tools
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#
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# Copyright (c) Siemens AG, 2011-2013
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#
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# Authors:
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# Jan Kiszka <jan.kiszka@siemens.com>
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#
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# This work is licensed under the terms of the GNU GPL version 2.
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#
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import gdb
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from linux import utils
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task_type = utils.CachedType("struct task_struct")
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class TaskList:
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def __init__(self):
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global task_type
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self.task_ptr_type = task_type.get_type().pointer()
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self.init_task = gdb.parse_and_eval("init_task")
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self.curr_group = self.init_task.address
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self.curr_task = None
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def __iter__(self):
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return self
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def next(self):
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t = self.curr_task
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if not t or t == self.curr_group:
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self.curr_group = \
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utils.container_of(self.curr_group['tasks']['next'],
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self.task_ptr_type, "tasks")
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if self.curr_group == self.init_task.address:
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raise StopIteration
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t = self.curr_task = self.curr_group
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else:
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self.curr_task = \
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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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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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