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Elliott Hughese27955c2011-08-26 15:21:24 -07001/*
2 * Copyright (C) 2008 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#include "signal_catcher.h"
18
Elliott Hughes94ce37a2011-10-18 15:07:48 -070019#include <fcntl.h>
Elliott Hughese27955c2011-08-26 15:21:24 -070020#include <pthread.h>
21#include <signal.h>
22#include <stdlib.h>
Elliott Hughes94ce37a2011-10-18 15:07:48 -070023#include <sys/stat.h>
Elliott Hughese27955c2011-08-26 15:21:24 -070024#include <sys/time.h>
Elliott Hughes94ce37a2011-10-18 15:07:48 -070025#include <sys/types.h>
Elliott Hughese27955c2011-08-26 15:21:24 -070026#include <unistd.h>
27
Brian Carlstrom24a3c2e2011-10-17 18:07:52 -070028#include "class_linker.h"
Elliott Hughes94ce37a2011-10-18 15:07:48 -070029#include "file.h"
Elliott Hughese27955c2011-08-26 15:21:24 -070030#include "heap.h"
Elliott Hughes94ce37a2011-10-18 15:07:48 -070031#include "os.h"
Brian Carlstrom1f870082011-08-23 16:02:11 -070032#include "runtime.h"
Elliott Hughese27955c2011-08-26 15:21:24 -070033#include "thread.h"
Elliott Hughes8d768a92011-09-14 16:35:25 -070034#include "thread_list.h"
Elliott Hughese27955c2011-08-26 15:21:24 -070035#include "utils.h"
36
37namespace art {
38
Elliott Hughes94ce37a2011-10-18 15:07:48 -070039SignalCatcher::SignalCatcher(const std::string& stack_trace_file)
40 : stack_trace_file_(stack_trace_file),
41 lock_("SignalCatcher lock"),
42 cond_("SignalCatcher::cond_"),
43 thread_(NULL) {
Elliott Hughes5fe594f2011-09-08 12:33:17 -070044 SetHaltFlag(false);
45
Elliott Hughese27955c2011-08-26 15:21:24 -070046 // Create a raw pthread; its start routine will attach to the runtime.
Elliott Hughes8d768a92011-09-14 16:35:25 -070047 CHECK_PTHREAD_CALL(pthread_create, (&pthread_, NULL, &Run, this), "signal catcher thread");
48
Elliott Hughes8d768a92011-09-14 16:35:25 -070049 MutexLock mu(lock_);
50 while (thread_ == NULL) {
Elliott Hughes5f791332011-09-15 17:45:30 -070051 cond_.Wait(lock_);
Elliott Hughese27955c2011-08-26 15:21:24 -070052 }
53}
54
55SignalCatcher::~SignalCatcher() {
56 // Since we know the thread is just sitting around waiting for signals
57 // to arrive, send it one.
Elliott Hughes5fe594f2011-09-08 12:33:17 -070058 SetHaltFlag(true);
Elliott Hughes8d768a92011-09-14 16:35:25 -070059 CHECK_PTHREAD_CALL(pthread_kill, (pthread_, SIGQUIT), "signal catcher shutdown");
60 CHECK_PTHREAD_CALL(pthread_join, (pthread_, NULL), "signal catcher shutdown");
Elliott Hughese27955c2011-08-26 15:21:24 -070061}
62
Elliott Hughes5fe594f2011-09-08 12:33:17 -070063void SignalCatcher::SetHaltFlag(bool new_value) {
64 MutexLock mu(lock_);
65 halt_ = new_value;
66}
67
68bool SignalCatcher::ShouldHalt() {
69 MutexLock mu(lock_);
70 return halt_;
71}
72
Elliott Hughes94ce37a2011-10-18 15:07:48 -070073void SignalCatcher::Output(const std::string& s) {
74 if (stack_trace_file_.empty()) {
75 LOG(INFO) << s;
76 return;
77 }
78
79 ScopedThreadStateChange tsc(Thread::Current(), Thread::kVmWait);
80 int fd = open(stack_trace_file_.c_str(), O_APPEND | O_CREAT | O_WRONLY, 0666);
81 if (fd == -1) {
82 PLOG(ERROR) << "Unable to open stack trace file '" << stack_trace_file_ << "'";
83 return;
84 }
85 UniquePtr<File> file(OS::FileFromFd(stack_trace_file_.c_str(), fd));
86 if (!file->WriteFully(s.data(), s.size())) {
87 PLOG(ERROR) << "Failed to write stack traces to '" << stack_trace_file_ << "'";
88 } else {
89 LOG(INFO) << "Wrote stack traces to '" << stack_trace_file_ << "'";
90 }
91 close(fd);
92}
93
Elliott Hughese27955c2011-08-26 15:21:24 -070094void SignalCatcher::HandleSigQuit() {
Elliott Hughesaccd83d2011-10-17 14:25:58 -070095 Runtime* runtime = Runtime::Current();
96 ThreadList* thread_list = runtime->GetThreadList();
Elliott Hughesaccd83d2011-10-17 14:25:58 -070097
98 thread_list->SuspendAll();
Elliott Hughese27955c2011-08-26 15:21:24 -070099
Elliott Hughes3b6baaa2011-10-14 19:13:56 -0700100 std::ostringstream os;
Elliott Hughesd92bec42011-09-02 17:04:36 -0700101 os << "\n"
Elliott Hughesd92bec42011-09-02 17:04:36 -0700102 << "----- pid " << getpid() << " at " << GetIsoDate() << " -----\n";
Elliott Hughese27955c2011-08-26 15:21:24 -0700103
Elliott Hughesd92bec42011-09-02 17:04:36 -0700104 std::string cmdline;
105 if (ReadFileToString("/proc/self/cmdline", &cmdline)) {
106 std::replace(cmdline.begin(), cmdline.end(), '\0', ' ');
107 os << "Cmd line: " << cmdline << "\n";
108 }
Elliott Hughese27955c2011-08-26 15:21:24 -0700109
Elliott Hughesaccd83d2011-10-17 14:25:58 -0700110 runtime->Dump(os);
Elliott Hughese27955c2011-08-26 15:21:24 -0700111
Brian Carlstrom6b4ef022011-10-23 14:59:04 -0700112 if (false) {
113 std::string maps;
114 if (ReadFileToString("/proc/self/maps", &maps)) {
115 os << "/proc/self/maps:\n" << maps;
116 }
Elliott Hughesd92bec42011-09-02 17:04:36 -0700117 }
118
Elliott Hughes94ce37a2011-10-18 15:07:48 -0700119 os << "----- end " << getpid() << " -----\n";
Elliott Hughese27955c2011-08-26 15:21:24 -0700120
Elliott Hughesaccd83d2011-10-17 14:25:58 -0700121 thread_list->ResumeAll();
Elliott Hughese27955c2011-08-26 15:21:24 -0700122
Elliott Hughes94ce37a2011-10-18 15:07:48 -0700123 Output(os.str());
Elliott Hughese27955c2011-08-26 15:21:24 -0700124}
125
126void SignalCatcher::HandleSigUsr1() {
127 LOG(INFO) << "SIGUSR1 forcing GC (no HPROF)";
128 Heap::CollectGarbage();
129}
130
Elliott Hughesc2f80062011-11-07 11:57:51 -0800131int SignalCatcher::WaitForSignal(sigset_t& mask) {
132 ScopedThreadStateChange tsc(thread_, Thread::kVmWait);
Elliott Hughesad7c2a32011-08-31 11:58:10 -0700133
134 // Signals for sigwait() must be blocked but not ignored. We
135 // block signals like SIGQUIT for all threads, so the condition
136 // is met. When the signal hits, we wake up, without any signal
137 // handlers being invoked.
138
139 // Sleep in sigwait() until a signal arrives. gdb causes EINTR failures.
140 int signal_number;
141 int rc = TEMP_FAILURE_RETRY(sigwait(&mask, &signal_number));
142 if (rc != 0) {
143 PLOG(FATAL) << "sigwait failed";
144 }
145
Elliott Hughesc2f80062011-11-07 11:57:51 -0800146 if (!ShouldHalt()) {
147 // Let the user know we got the signal, just in case the system's too screwed for us to
148 // actually do what they want us to do...
149 LOG(INFO) << *thread_ << ": reacting to signal " << signal_number;
150
151 // If anyone's holding locks (and so we might fail to get back into state Runnable), say so...
152 ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
153 pid_t heap_lock_owner = Heap::GetLockOwner();
154 pid_t thread_list_lock_owner = Runtime::Current()->GetThreadList()->GetLockOwner();
155 pid_t classes_lock_owner = class_linker->GetClassesLockOwner();
156 pid_t dex_lock_owner = class_linker->GetDexLockOwner();
157 if ((heap_lock_owner | thread_list_lock_owner | classes_lock_owner | dex_lock_owner) != 0) {
158 LOG(INFO) << "Heap lock owner tid: " << heap_lock_owner << "\n"
159 << "ThreadList lock owner tid: " << thread_list_lock_owner << "\n"
160 << "ClassLinker classes lock owner tid: " << classes_lock_owner << "\n"
161 << "ClassLinker dex lock owner tid: " << dex_lock_owner << "\n";
162 }
163 }
164
Elliott Hughesad7c2a32011-08-31 11:58:10 -0700165 return signal_number;
166}
167
Elliott Hughes5fe594f2011-09-08 12:33:17 -0700168void* SignalCatcher::Run(void* arg) {
169 SignalCatcher* signal_catcher = reinterpret_cast<SignalCatcher*>(arg);
170 CHECK(signal_catcher != NULL);
171
Elliott Hughes8d768a92011-09-14 16:35:25 -0700172 Runtime* runtime = Runtime::Current();
173 runtime->AttachCurrentThread("Signal Catcher", true);
Brian Carlstromf28bc5b2011-10-26 01:15:03 -0700174 Thread::Current()->SetState(Thread::kRunnable);
Elliott Hughes8d768a92011-09-14 16:35:25 -0700175
176 {
177 MutexLock mu(signal_catcher->lock_);
178 signal_catcher->thread_ = Thread::Current();
Elliott Hughes5f791332011-09-15 17:45:30 -0700179 signal_catcher->cond_.Broadcast();
Elliott Hughes8d768a92011-09-14 16:35:25 -0700180 }
Elliott Hughese27955c2011-08-26 15:21:24 -0700181
Elliott Hughese27955c2011-08-26 15:21:24 -0700182 // Set up mask with signals we want to handle.
183 sigset_t mask;
184 sigemptyset(&mask);
185 sigaddset(&mask, SIGQUIT);
186 sigaddset(&mask, SIGUSR1);
187
188 while (true) {
Elliott Hughesc2f80062011-11-07 11:57:51 -0800189 int signal_number = signal_catcher->WaitForSignal(mask);
Elliott Hughes5fe594f2011-09-08 12:33:17 -0700190 if (signal_catcher->ShouldHalt()) {
Elliott Hughes8d768a92011-09-14 16:35:25 -0700191 runtime->DetachCurrentThread();
Elliott Hughese27955c2011-08-26 15:21:24 -0700192 return NULL;
193 }
194
Elliott Hughese27955c2011-08-26 15:21:24 -0700195 switch (signal_number) {
196 case SIGQUIT:
Elliott Hughes94ce37a2011-10-18 15:07:48 -0700197 signal_catcher->HandleSigQuit();
Elliott Hughese27955c2011-08-26 15:21:24 -0700198 break;
199 case SIGUSR1:
Elliott Hughes94ce37a2011-10-18 15:07:48 -0700200 signal_catcher->HandleSigUsr1();
Elliott Hughese27955c2011-08-26 15:21:24 -0700201 break;
202 default:
203 LOG(ERROR) << "Unexpected signal %d" << signal_number;
204 break;
205 }
206 }
207}
208
209} // namespace art