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Copy pathusdt.py
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45 lines (38 loc) · 1.7 KB
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# Copyright 2016 Sasha Goldshtein
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from .libbcc import lib, _USDT_CB
class USDT(object):
def __init__(self, pid=None, path=None):
if pid:
self.pid = pid
self.context = lib.bcc_usdt_new_frompid(pid)
if self.context == None:
raise Exception("USDT failed to instrument PID %d" % pid)
elif path:
self.path = path
self.context = lib.bcc_usdt_new_frompath(path)
if self.context == None:
raise Exception("USDT failed to instrument path %s" % path)
def enable_probe(self, probe, fn_name):
if lib.bcc_usdt_enable_probe(self.context, probe, fn_name) != 0:
raise Exception("failed to enable probe '%s'" % probe)
def get_text(self):
return lib.bcc_usdt_genargs(self.context)
def attach_uprobes(self, bpf):
probes = []
def _add_probe(binpath, fn_name, addr, pid):
probes.append((binpath, fn_name, addr, pid))
lib.bcc_usdt_foreach_uprobe(self.context, _USDT_CB(_add_probe))
for (binpath, fn_name, addr, pid) in probes:
bpf.attach_uprobe(name=binpath, fn_name=fn_name, addr=addr, pid=pid)