1 /*
2 * Copyright (C) 2011 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 "runtime.h"
18
19 #include <signal.h>
20
21 #include <iostream>
22
23 #include "base/memory_tool.h"
24 #include "runtime_common.h"
25
26 namespace art {
27
HandleUnexpectedSignalLinux(int signal_number,siginfo_t * info,void * raw_context)28 void HandleUnexpectedSignalLinux(int signal_number, siginfo_t* info, void* raw_context) {
29 // Linux is mainly used for host testing. Under those conditions, react to the timeout signal,
30 // and dump to stderr to avoid missing output on double-faults.
31 HandleUnexpectedSignalCommon(signal_number,
32 info,
33 raw_context,
34 /* handle_timeout_signal= */ true,
35 /* dump_on_stderr= */ true);
36
37 if (getenv("debug_db_uid") != nullptr || getenv("art_wait_for_gdb_on_crash") != nullptr) {
38 pid_t tid = GetTid();
39 std::string thread_name(GetThreadName(tid));
40 std::cerr << "********************************************************\n"
41 << "* Process " << getpid() << " thread " << tid << " \"" << thread_name
42 << "\""
43 << " has been suspended while crashing.\n"
44 << "* Attach gdb:\n"
45 << "* gdb -p " << tid << "\n"
46 << "********************************************************"
47 << std::endl;
48 // Wait for debugger to attach.
49 while (true) {
50 }
51 }
52 #ifdef __linux__
53 // Remove our signal handler for this signal...
54 struct sigaction action;
55 memset(&action, 0, sizeof(action));
56 sigemptyset(&action.sa_mask);
57 action.sa_handler = SIG_DFL;
58 sigaction(signal_number, &action, nullptr);
59 // ...and re-raise so we die with the appropriate status.
60 kill(getpid(), signal_number);
61 #else
62 exit(EXIT_FAILURE);
63 #endif
64 }
65
InitPlatformSignalHandlers()66 void Runtime::InitPlatformSignalHandlers() {
67 constexpr bool kIsASAN =
68 #ifdef ADDRESS_SANITIZER
69 true;
70 #else
71 false;
72 #endif
73 if (!kIsTargetBuild && kIsASAN) {
74 // (Temporarily) try and let ASAN print abort stacks, as our code sometimes fails. b/31098551
75 return;
76 }
77 // On the host, we don't have debuggerd to dump a stack for us when something unexpected happens.
78 InitPlatformSignalHandlersCommon(HandleUnexpectedSignalLinux,
79 nullptr,
80 /* handle_timeout_signal= */ true);
81 }
82
83 } // namespace art
84