1 /* 2 * Copyright (C) 2012 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 17 #define LOG_TAG "DEBUG" 18 19 #include <errno.h> 20 #include <dirent.h> 21 #include <limits.h> 22 #include <stddef.h> 23 #include <stdio.h> 24 #include <stdlib.h> 25 #include <string.h> 26 #include <sys/ptrace.h> 27 #include <sys/types.h> 28 #include <time.h> 29 #include <unistd.h> 30 31 #include <memory> 32 #include <string> 33 34 #include <backtrace/Backtrace.h> 35 #include <log/log.h> 36 37 #include "backtrace.h" 38 39 #include "utility.h" 40 41 static void dump_process_header(log_t* log, pid_t pid, const char* process_name) { 42 time_t t = time(NULL); 43 struct tm tm; 44 localtime_r(&t, &tm); 45 char timestr[64]; 46 strftime(timestr, sizeof(timestr), "%F %T", &tm); 47 _LOG(log, logtype::BACKTRACE, "\n\n----- pid %d at %s -----\n", pid, timestr); 48 49 if (process_name) { 50 _LOG(log, logtype::BACKTRACE, "Cmd line: %s\n", process_name); 51 } 52 _LOG(log, logtype::BACKTRACE, "ABI: '%s'\n", ABI_STRING); 53 } 54 55 static void dump_process_footer(log_t* log, pid_t pid) { 56 _LOG(log, logtype::BACKTRACE, "\n----- end %d -----\n", pid); 57 } 58 59 static void log_thread_name(log_t* log, pid_t tid, const char* thread_name) { 60 _LOG(log, logtype::BACKTRACE, "\n\"%s\" sysTid=%d\n", thread_name, tid); 61 } 62 63 static void dump_thread(log_t* log, BacktraceMap* map, pid_t pid, pid_t tid, 64 const std::string& thread_name) { 65 log_thread_name(log, tid, thread_name.c_str()); 66 67 std::unique_ptr<Backtrace> backtrace(Backtrace::Create(pid, tid, map)); 68 if (backtrace->Unwind(0)) { 69 dump_backtrace_to_log(backtrace.get(), log, " "); 70 } else { 71 ALOGE("Unwind failed: tid = %d: %s", tid, 72 backtrace->GetErrorString(backtrace->GetError()).c_str()); 73 } 74 } 75 76 void dump_backtrace(int fd, BacktraceMap* map, pid_t pid, pid_t tid, const std::string& process_name, 77 const std::map<pid_t, std::string>& threads, std::string* amfd_data) { 78 log_t log; 79 log.tfd = fd; 80 log.amfd_data = amfd_data; 81 82 dump_process_header(&log, pid, process_name.c_str()); 83 dump_thread(&log, map, pid, tid, threads.find(tid)->second.c_str()); 84 85 for (const auto& it : threads) { 86 pid_t thread_tid = it.first; 87 const std::string& thread_name = it.second; 88 if (thread_tid != tid) { 89 dump_thread(&log, map, pid, thread_tid, thread_name.c_str()); 90 } 91 } 92 93 dump_process_footer(&log, pid); 94 } 95 96 void dump_backtrace_ucontext(int output_fd, ucontext_t* ucontext) { 97 pid_t pid = getpid(); 98 pid_t tid = gettid(); 99 100 log_t log; 101 log.tfd = output_fd; 102 log.amfd_data = nullptr; 103 104 char thread_name[16]; 105 read_with_default("/proc/self/comm", thread_name, sizeof(thread_name), "<unknown>"); 106 log_thread_name(&log, tid, thread_name); 107 108 std::unique_ptr<Backtrace> backtrace(Backtrace::Create(pid, tid)); 109 if (backtrace->Unwind(0, ucontext)) { 110 dump_backtrace_to_log(backtrace.get(), &log, " "); 111 } else { 112 ALOGE("Unwind failed: tid = %d: %s", tid, 113 backtrace->GetErrorString(backtrace->GetError()).c_str()); 114 } 115 } 116 117 void dump_backtrace_header(int output_fd) { 118 log_t log; 119 log.tfd = output_fd; 120 log.amfd_data = nullptr; 121 122 char process_name[128]; 123 read_with_default("/proc/self/cmdline", process_name, sizeof(process_name), "<unknown>"); 124 dump_process_header(&log, getpid(), process_name); 125 } 126 127 void dump_backtrace_footer(int output_fd) { 128 log_t log; 129 log.tfd = output_fd; 130 log.amfd_data = nullptr; 131 132 dump_process_footer(&log, getpid()); 133 } 134 135 void dump_backtrace_to_log(Backtrace* backtrace, log_t* log, const char* prefix) { 136 for (size_t i = 0; i < backtrace->NumFrames(); i++) { 137 _LOG(log, logtype::BACKTRACE, "%s%s\n", prefix, backtrace->FormatFrameData(i).c_str()); 138 } 139 } 140
