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#ifndef ART_RUNTIME_SIGNAL_SET_H_
18#define ART_RUNTIME_SIGNAL_SET_H_
19
20#include <signal.h>
21
22#include "base/logging.h"
23
24namespace art {
25
26class SignalSet {
27 public:
28  SignalSet() {
29    if (sigemptyset(&set_) == -1) {
30      PLOG(FATAL) << "sigemptyset failed";
31    }
32  }
33
34  void Add(int signal) {
35    if (sigaddset(&set_, signal) == -1) {
36      PLOG(FATAL) << "sigaddset " << signal << " failed";
37    }
38  }
39
40  void Block() {
41    if (sigprocmask(SIG_BLOCK, &set_, NULL) == -1) {
42      PLOG(FATAL) << "sigprocmask failed";
43    }
44  }
45
46  int Wait() {
47    // Sleep in sigwait() until a signal arrives. gdb causes EINTR failures.
48    int signal_number;
49    int rc = TEMP_FAILURE_RETRY(sigwait(&set_, &signal_number));
50    if (rc != 0) {
51      PLOG(FATAL) << "sigwait failed";
52    }
53    return signal_number;
54  }
55
56 private:
57  sigset_t set_;
58};
59
60}  // namespace art
61
62#endif  // ART_RUNTIME_SIGNAL_SET_H_
63