scripts/gdb/linux/tasks.py

Source file repositories/reference/linux-study-clean/scripts/gdb/linux/tasks.py

File Facts

System
Linux kernel
Corpus path
scripts/gdb/linux/tasks.py
Extension
.py
Size
3243 bytes
Lines
128
Domain
Support Tooling And Documentation
Bucket
scripts
Inferred role
Support Tooling And Documentation: scripts
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

#
# gdb helper commands and functions for Linux kernel debugging
#
#  task & thread tools
#
# Copyright (c) Siemens AG, 2011-2013
#
# Authors:
#  Jan Kiszka <jan.kiszka@siemens.com>
#
# This work is licensed under the terms of the GNU GPL version 2.
#

import gdb

from linux import utils, lists


task_type = utils.CachedType("struct task_struct")


def task_lists():
    task_ptr_type = task_type.get_type().pointer()
    init_task = gdb.parse_and_eval("init_task").address
    t = init_task

    while True:
        thread_head = t['signal']['thread_head']
        for thread in lists.list_for_each_entry(thread_head, task_ptr_type, 'thread_node'):
            yield thread

        t = utils.container_of(t['tasks']['next'],
                               task_ptr_type, "tasks")
        if t == init_task:
            return


def get_task_by_pid(pid):
    for task in task_lists():
        if int(task['pid']) == pid:
            return task
    return None


class LxTaskByPidFunc(gdb.Function):
    """Find Linux task by PID and return the task_struct variable.

$lx_task_by_pid(PID): Given PID, iterate over all tasks of the target and
return that task_struct variable which PID matches."""

    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()


class LxPs(gdb.Command):
    """Dump Linux tasks."""

    def __init__(self):
        super(LxPs, self).__init__("lx-ps", gdb.COMMAND_DATA)

Annotation

Implementation Notes