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    Subject[PATCH v4 08/13] scripts/gdb: Add helper and convenience function to look up tasks
    Date
    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>
    ---
    scripts/gdb/task.py | 29 +++++++++++++++++++++++++++++
    scripts/gdb/vmlinux-gdb.py | 1 +
    2 files changed, 30 insertions(+), 0 deletions(-)

    diff --git a/scripts/gdb/task.py b/scripts/gdb/task.py
    index ff05aa5..93e6c0c 100644
    --- a/scripts/gdb/task.py
    +++ b/scripts/gdb/task.py
    @@ -38,3 +38,32 @@ def for_each_task(func, arg = None):
    get_task_ptr_type(), "thread_group")
    if t == g:
    break
    +
    +def get_task_by_pid(pid):
    + def match_pid(t, arg):
    + if int(t['pid']) == arg['pid']:
    + arg['task'] = t
    +
    + arg = { 'pid': pid, 'task': None }
    + for_each_task(match_pid, arg)
    +
    + return arg['task']
    +
    +
    +class LxTaskByPidFunc(gdb.Function):
    + __doc__ = "Find Linux task by PID and return the task_struct variable.\n" \
    + "\n" \
    + "$lx_task_by_pid(PID): Given PID, iterate over all tasks of the target and\n" \
    + "return that task_struct variable which PID matches.\n"
    +
    + def __init__(self):
    + super(LxTaskByPidFunc, self).__init__("lx_task_by_pid")
    +
    + def invoke(self, pid):
    + task = get_task_by_pid(pid)
    + if task:
    + return task.dereference()
    + else:
    + raise gdb.GdbError("No task of PID " + str(pid))
    +
    +LxTaskByPidFunc()
    diff --git a/scripts/gdb/vmlinux-gdb.py b/scripts/gdb/vmlinux-gdb.py
    index 47f296d..e78b353 100644
    --- a/scripts/gdb/vmlinux-gdb.py
    +++ b/scripts/gdb/vmlinux-gdb.py
    @@ -24,3 +24,4 @@ else:
    import utils
    import symbols
    import dmesg
    + import task
    --
    1.7.3.4


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