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/*
* Copyright (C) 2012 The Android Open Source Project
*
* 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.
*/
#define LOG_TAG "DEBUG"
#include "libdebuggerd/backtrace.h"
#include <errno.h>
#include <dirent.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ptrace.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include <map>
#include <memory>
#include <string>
#include <android-base/unique_fd.h>
#include <log/log.h>
#include <unwindstack/Unwinder.h>
#include "libdebuggerd/types.h"
#include "libdebuggerd/utility.h"
static void dump_process_header(log_t* log, pid_t pid, const char* process_name) {
time_t t = time(NULL);
struct tm tm;
localtime_r(&t, &tm);
char timestr[64];
strftime(timestr, sizeof(timestr), "%F %T", &tm);
_LOG(log, logtype::BACKTRACE, "\n\n----- pid %d at %s -----\n", pid, timestr);
if (process_name) {
_LOG(log, logtype::BACKTRACE, "Cmd line: %s\n", process_name);
}
_LOG(log, logtype::BACKTRACE, "ABI: '%s'\n", ABI_STRING);
}
static void dump_process_footer(log_t* log, pid_t pid) {
_LOG(log, logtype::BACKTRACE, "\n----- end %d -----\n", pid);
}
void dump_backtrace_thread(int output_fd, unwindstack::Unwinder* unwinder,
const ThreadInfo& thread) {
log_t log;
log.tfd = output_fd;
log.amfd_data = nullptr;
_LOG(&log, logtype::BACKTRACE, "\n\"%s\" sysTid=%d\n", thread.thread_name.c_str(), thread.tid);
unwinder->SetRegs(thread.registers.get());
unwinder->Unwind();
if (unwinder->NumFrames() == 0) {
_LOG(&log, logtype::THREAD, "Unwind failed: tid = %d", thread.tid);
return;
}
log_backtrace(&log, unwinder, " ");
}
void dump_backtrace(android::base::unique_fd output_fd, unwindstack::Unwinder* unwinder,
const std::map<pid_t, ThreadInfo>& thread_info, pid_t target_thread) {
log_t log;
log.tfd = output_fd.get();
log.amfd_data = nullptr;
auto target = thread_info.find(target_thread);
if (target == thread_info.end()) {
ALOGE("failed to find target thread in thread info");
return;
}
dump_process_header(&log, target->second.pid, target->second.process_name.c_str());
dump_backtrace_thread(output_fd.get(), unwinder, target->second);
for (const auto& [tid, info] : thread_info) {
if (tid != target_thread) {
dump_backtrace_thread(output_fd.get(), unwinder, info);
}
}
dump_process_footer(&log, target->second.pid);
}
void dump_backtrace_header(int output_fd) {
log_t log;
log.tfd = output_fd;
log.amfd_data = nullptr;
char process_name[128];
read_with_default("/proc/self/cmdline", process_name, sizeof(process_name), "<unknown>");
dump_process_header(&log, getpid(), process_name);
}
void dump_backtrace_footer(int output_fd) {
log_t log;
log.tfd = output_fd;
log.amfd_data = nullptr;
dump_process_footer(&log, getpid());
}
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