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https://github.com/JakeHillion/drgn.git
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a4b9d68a8c
Apparently the latter is deprecated and the former is preferred. Signed-off-by: Omar Sandoval <osandov@osandov.com>
71 lines
1.9 KiB
Python
Executable File
71 lines
1.9 KiB
Python
Executable File
# Copyright (c) Facebook, Inc. and its affiliates.
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# SPDX-License-Identifier: GPL-3.0-or-later
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"""List the paths of all descendants of a cgroup v2"""
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from contextlib import contextmanager
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import os
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import sys
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from drgn import cast
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from drgn.helpers import enum_type_to_class
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from drgn.helpers.linux import (
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cgroup_bpf_prog_for_each,
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cgroup_path,
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css_for_each_descendant_pre,
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fget,
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find_task,
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)
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BpfAttachType = enum_type_to_class(
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prog.type("enum bpf_attach_type"),
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"BpfAttachType",
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exclude=("__MAX_BPF_ATTACH_TYPE",),
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)
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@contextmanager
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def open_dir(*args, **kwds):
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# Built-in open() context manager can't deal with directories.
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fd = os.open(*args, **kwds)
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try:
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yield fd
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finally:
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os.close(fd)
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def get_cgroup():
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if len(sys.argv) == 1:
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return prog["cgrp_dfl_root"].cgrp
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task = find_task(prog, os.getpid())
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with open_dir(sys.argv[1], os.O_RDONLY) as fd:
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file_ = fget(task, fd)
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kn = cast("struct kernfs_node *", file_.f_path.dentry.d_inode.i_private)
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return cast("struct cgroup *", kn.priv)
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def print_cgroup_bpf_progs(cgrp):
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cgroup_printed = False
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for attach_type in BpfAttachType:
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attach_flags = cgrp.bpf.flags[attach_type.value].value_()
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for prog in cgroup_bpf_prog_for_each(cgrp, attach_type.value):
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prog_id = prog.aux.id.value_()
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prog_name = prog.aux.name.string_().decode()
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if not cgroup_printed:
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print(cgroup_path(cgrp).decode())
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cgroup_printed = True
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print(
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" {:<8} {:<30} {:<15} {:<15}".format(
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prog_id, attach_type.name, attach_flags, prog_name
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)
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)
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css = get_cgroup().self.address_of_()
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for pos in css_for_each_descendant_pre(css):
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if sys.argv[-1] == "bpf":
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print_cgroup_bpf_progs(pos.cgroup)
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else:
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print(cgroup_path(pos.cgroup).decode())
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