1#!/usr/bin/env python3 2# Copyright (C) 2019 The Android Open Source Project 3# 4# Licensed under the Apache License, Version 2.0 (the "License"); 5# you may not use this file except in compliance with the License. 6# You may obtain a copy of the License at 7# 8# http://www.apache.org/licenses/LICENSE-2.0 9# 10# Unless required by applicable law or agreed to in writing, software 11# distributed under the License is distributed on an "AS IS" BASIS, 12# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13# See the License for the specific language governing permissions and 14# limitations under the License. 15 16# This synthetic trace tests a short lived process which is forked, performs 17# a rename (to simulate an exec) then dies before the /proc scraper finds the 18# real process name 19 20from os import sys, path 21 22 23from synth_common import CLONE_THREAD 24import synth_common 25 26trace = synth_common.create_trace() 27 28# Create a parent process which will be forked below. 29trace.add_packet(ts=1) 30trace.add_process(10, 0, "parent") 31trace.add_process(11, 0, "short_lived") 32 33# Make the short lived thread emit a begin/end pair then exit. 34trace.add_ftrace_packet(0) 35trace.add_atrace_begin(ts=10, tid=11, pid=11, buf='test') 36trace.add_atrace_end(ts=11, tid=11, pid=11) 37trace.add_process_free(ts=12, tid=11, comm='short_lived', prio=0) 38 39# Now, reuse tid 11 and emit a begin on the parent and an end on the child. 40# This is an abuse of sync events (which technically should always be associated 41# with a single thread) but this happens all the time in places like ART so 42# we should support it. 43trace.add_ftrace_packet(0) 44trace.add_newtask( 45 ts=15, tid=10, new_tid=11, new_comm='child', flags=CLONE_THREAD) 46trace.add_rename( 47 ts=17, tid=11, old_comm='child', new_comm='true_name', oom_score_adj=1000) 48trace.add_atrace_begin(ts=18, tid=10, pid=10, buf='test') 49trace.add_atrace_end(ts=19, tid=11, pid=10) 50 51sys.stdout.buffer.write(trace.trace.SerializeToString()) 52