9818bd2bbe
When someone enables wait_for_gdb, activity manager will kill the stopped process before a developer can attach to the process. To allow debugging in this case, change the code to only contact the activity manager right before continuing the process that is crashing. Also, modify the conditions under which to do a gdb attach. The previous code did a partial attach if perform_dump failed. The new version simply allows an attach regardless of whether perform_dump passes or fails. Bug: 28409358 Change-Id: I4fe8d390c212d47e007cbe6543c2d114c3c7aeff
120 lines
3.3 KiB
C++
120 lines
3.3 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 <string>
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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: %s", tid,
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backtrace->GetErrorString(backtrace->GetError()).c_str());
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}
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}
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void dump_backtrace(int fd, BacktraceMap* map, pid_t pid, pid_t tid,
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const std::set<pid_t>& siblings, std::string* amfd_data) {
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log_t log;
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log.tfd = fd;
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log.amfd_data = amfd_data;
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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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