| 1 | // |
|---|---|
| 2 | // detail/posix_signal_blocker.hpp |
| 3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 4 | // |
| 5 | // Copyright (c) 2003-2015 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
| 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(set: &new_mask); |
| 43 | blocked_ = (pthread_sigmask(SIG_BLOCK, newmask: &new_mask, oldmask: &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, newmask: &old_mask_, oldmask: 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(set: &new_mask); |
| 60 | blocked_ = (pthread_sigmask(SIG_BLOCK, newmask: &new_mask, oldmask: &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, newmask: &old_mask_, oldmask: 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 |
| 88 |