1 /*
2 * Copyright (C) 2024 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 "common/libs/utils/signals.h"
18
19 #include <errno.h>
20 #include <signal.h>
21 #include <string.h>
22
23 #include <vector>
24
25 #include <android-base/logging.h>
26
27 namespace cuttlefish {
28
SignalMasker(sigset_t signals)29 SignalMasker::SignalMasker(sigset_t signals) {
30 auto res = sigprocmask(SIG_SETMASK, &signals, &old_mask_);
31 auto err = errno;
32 CHECK(res == 0) << "Failed to set thread's blocked signal mask: "
33 << strerror(err);
34 }
35
~SignalMasker()36 SignalMasker::~SignalMasker() {
37 auto res = sigprocmask(SIG_SETMASK, &old_mask_, NULL);
38 auto err = errno;
39 CHECK(res == 0) << "Failed to reset thread's blocked signal mask: "
40 << strerror(err);
41 }
42
ChangeSignalHandlers(void (* handler)(int),std::vector<int> signals)43 void ChangeSignalHandlers(void (*handler)(int), std::vector<int> signals) {
44 struct sigaction act;
45 act.sa_handler = handler;
46 sigemptyset(&act.sa_mask);
47 for (auto signal: signals) {
48 sigaddset(&act.sa_mask, signal);
49 }
50 act.sa_flags = 0;
51
52 for (auto signal : signals) {
53 sigaction(signal, &act, NULL);
54 }
55 }
56
57 } // namespace cuttlefish
58
59