7c89f9e955
Previously, we weren't PTRACE_ATTACHing to all of the threads of a process, and we were also trying to do it after forking and dropping privileges. This patch ensures that all ptrace attaching/detaching happens in one place, before forking/exiting respectively. Bug: http://b/26443860 Bug: http://b/26436605 Bug: http://b/26436486 Change-Id: Id94e0c1d9d56c051d0dd281d895aaa3285079198
118 lines
3.2 KiB
C++
118 lines
3.2 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "DEBUG"
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <time.h>
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#include <errno.h>
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#include <limits.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/ptrace.h>
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#include <memory>
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#include <backtrace/Backtrace.h>
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#include <log/log.h>
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#include "backtrace.h"
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#include "utility.h"
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static void dump_process_header(log_t* log, pid_t pid) {
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char path[PATH_MAX];
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char procnamebuf[1024];
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char* procname = NULL;
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FILE* fp;
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snprintf(path, sizeof(path), "/proc/%d/cmdline", pid);
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if ((fp = fopen(path, "r"))) {
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procname = fgets(procnamebuf, sizeof(procnamebuf), fp);
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fclose(fp);
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}
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time_t t = time(NULL);
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struct tm tm;
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localtime_r(&t, &tm);
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char timestr[64];
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strftime(timestr, sizeof(timestr), "%F %T", &tm);
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_LOG(log, logtype::BACKTRACE, "\n\n----- pid %d at %s -----\n", pid, timestr);
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if (procname) {
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_LOG(log, logtype::BACKTRACE, "Cmd line: %s\n", procname);
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}
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_LOG(log, logtype::BACKTRACE, "ABI: '%s'\n", ABI_STRING);
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}
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static void dump_process_footer(log_t* log, pid_t pid) {
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_LOG(log, logtype::BACKTRACE, "\n----- end %d -----\n", pid);
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}
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static void dump_thread(log_t* log, BacktraceMap* map, pid_t pid, pid_t tid) {
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char path[PATH_MAX];
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char threadnamebuf[1024];
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char* threadname = NULL;
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FILE* fp;
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snprintf(path, sizeof(path), "/proc/%d/comm", tid);
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if ((fp = fopen(path, "r"))) {
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threadname = fgets(threadnamebuf, sizeof(threadnamebuf), fp);
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fclose(fp);
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if (threadname) {
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size_t len = strlen(threadname);
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if (len && threadname[len - 1] == '\n') {
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threadname[len - 1] = '\0';
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}
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}
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}
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_LOG(log, logtype::BACKTRACE, "\n\"%s\" sysTid=%d\n", threadname ? threadname : "<unknown>", tid);
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std::unique_ptr<Backtrace> backtrace(Backtrace::Create(pid, tid, map));
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if (backtrace->Unwind(0)) {
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dump_backtrace_to_log(backtrace.get(), log, " ");
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} else {
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ALOGE("Unwind failed: tid = %d", tid);
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}
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}
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void dump_backtrace(int fd, int amfd, BacktraceMap* map, pid_t pid, pid_t tid,
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const std::set<pid_t>& siblings) {
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log_t log;
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log.tfd = fd;
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log.amfd = amfd;
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dump_process_header(&log, pid);
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dump_thread(&log, map, pid, tid);
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for (pid_t sibling : siblings) {
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dump_thread(&log, map, pid, sibling);
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}
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dump_process_footer(&log, pid);
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}
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void dump_backtrace_to_log(Backtrace* backtrace, log_t* log, const char* prefix) {
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for (size_t i = 0; i < backtrace->NumFrames(); i++) {
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_LOG(log, logtype::BACKTRACE, "%s%s\n", prefix, backtrace->FormatFrameData(i).c_str());
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}
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}
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