/Users/deen/code/yugabyte-db/src/yb/util/signal_util.cc
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1 | | // Copyright (c) YugaByte, Inc. |
2 | | // |
3 | | // Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except |
4 | | // in compliance with the License. You may obtain a copy of the License at |
5 | | // |
6 | | // http://www.apache.org/licenses/LICENSE-2.0 |
7 | | // |
8 | | // Unless required by applicable law or agreed to in writing, software distributed under the License |
9 | | // is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express |
10 | | // or implied. See the License for the specific language governing permissions and limitations |
11 | | // under the License. |
12 | | |
13 | | #include "yb/util/signal_util.h" |
14 | | |
15 | | #include <signal.h> |
16 | | #include "yb/util/errno.h" |
17 | | |
18 | | namespace yb { |
19 | | |
20 | 902 | Result<sigset_t> ThreadSignalMaskBlock(const std::vector<int>& signals_to_block) { |
21 | | // Note that in case of an error sigaddset sets errno and returns -1 |
22 | | // while pthread_sigmask returns errno directly. |
23 | | |
24 | 902 | sigset_t mask; |
25 | 902 | sigemptyset(&mask); |
26 | 4.51k | for (int sig : signals_to_block) { |
27 | 4.51k | int err = sigaddset(&mask, sig); |
28 | 4.51k | if (err != 0) { |
29 | 0 | return STATUS(InternalError, "sigaddset failed", Errno(errno)); |
30 | 0 | } |
31 | 4.51k | } |
32 | | |
33 | 902 | sigset_t old_mask; |
34 | 902 | int err = pthread_sigmask(SIG_BLOCK, &mask, &old_mask); |
35 | 902 | return (err == 0 |
36 | 902 | ? Result<sigset_t>(old_mask) |
37 | 0 | : STATUS(InternalError, "SIG_BLOCK failed", Errno(err))); |
38 | 902 | } |
39 | | |
40 | 902 | Status ThreadSignalMaskRestore(sigset_t old_mask) { |
41 | 902 | int err = pthread_sigmask(SIG_SETMASK, &old_mask, NULL /* oldset */); |
42 | 902 | return (err == 0 |
43 | 902 | ? Status::OK() |
44 | 0 | : STATUS(InternalError, "SIG_SETMASK failed", Errno(err))); |
45 | 902 | } |
46 | | |
47 | | const std::vector<int> kYsqlHandledSignals{ |
48 | | // Following handlers are installed in StartBackgroundWorker: |
49 | | SIGINT, // StatementCancelHandler |
50 | | SIGUSR1, // procsignal_sigusr1_handler |
51 | | SIGFPE, // FloatExceptionHandler |
52 | | SIGTERM, // bgworker_die |
53 | | SIGQUIT // bgworker_quickdie |
54 | | }; |
55 | | |
56 | 902 | Result<sigset_t> ThreadYsqlSignalMaskBlock() { |
57 | 902 | return ThreadSignalMaskBlock(kYsqlHandledSignals); |
58 | 902 | } |
59 | | |
60 | | } // namespace yb |