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1 | // |
2 | // detail/posix_signal_blocker.hpp | |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
92f5a8d4 | 5 | // Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
7c673cae FG |
6 | // |
7 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
8 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
9 | // | |
10 | ||
11 | #ifndef BOOST_ASIO_DETAIL_POSIX_SIGNAL_BLOCKER_HPP | |
12 | #define BOOST_ASIO_DETAIL_POSIX_SIGNAL_BLOCKER_HPP | |
13 | ||
14 | #if defined(_MSC_VER) && (_MSC_VER >= 1200) | |
15 | # pragma once | |
16 | #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) | |
17 | ||
18 | #include <boost/asio/detail/config.hpp> | |
19 | ||
20 | #if defined(BOOST_ASIO_HAS_PTHREADS) | |
21 | ||
22 | #include <csignal> | |
23 | #include <pthread.h> | |
24 | #include <signal.h> | |
25 | #include <boost/asio/detail/noncopyable.hpp> | |
26 | ||
27 | #include <boost/asio/detail/push_options.hpp> | |
28 | ||
29 | namespace boost { | |
30 | namespace asio { | |
31 | namespace detail { | |
32 | ||
33 | class posix_signal_blocker | |
34 | : private noncopyable | |
35 | { | |
36 | public: | |
37 | // Constructor blocks all signals for the calling thread. | |
38 | posix_signal_blocker() | |
39 | : blocked_(false) | |
40 | { | |
41 | sigset_t new_mask; | |
42 | sigfillset(&new_mask); | |
43 | blocked_ = (pthread_sigmask(SIG_BLOCK, &new_mask, &old_mask_) == 0); | |
44 | } | |
45 | ||
46 | // Destructor restores the previous signal mask. | |
47 | ~posix_signal_blocker() | |
48 | { | |
49 | if (blocked_) | |
50 | pthread_sigmask(SIG_SETMASK, &old_mask_, 0); | |
51 | } | |
52 | ||
53 | // Block all signals for the calling thread. | |
54 | void block() | |
55 | { | |
56 | if (!blocked_) | |
57 | { | |
58 | sigset_t new_mask; | |
59 | sigfillset(&new_mask); | |
60 | blocked_ = (pthread_sigmask(SIG_BLOCK, &new_mask, &old_mask_) == 0); | |
61 | } | |
62 | } | |
63 | ||
64 | // Restore the previous signal mask. | |
65 | void unblock() | |
66 | { | |
67 | if (blocked_) | |
68 | blocked_ = (pthread_sigmask(SIG_SETMASK, &old_mask_, 0) != 0); | |
69 | } | |
70 | ||
71 | private: | |
72 | // Have signals been blocked. | |
73 | bool blocked_; | |
74 | ||
75 | // The previous signal mask. | |
76 | sigset_t old_mask_; | |
77 | }; | |
78 | ||
79 | } // namespace detail | |
80 | } // namespace asio | |
81 | } // namespace boost | |
82 | ||
83 | #include <boost/asio/detail/pop_options.hpp> | |
84 | ||
85 | #endif // defined(BOOST_ASIO_HAS_PTHREADS) | |
86 | ||
87 | #endif // BOOST_ASIO_DETAIL_POSIX_SIGNAL_BLOCKER_HPP |