PosixSignalWatcher
This commit is contained in:
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83
examples/qt/02_posix-signal-watcher/CMakeLists.txt
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83
examples/qt/02_posix-signal-watcher/CMakeLists.txt
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@ -0,0 +1,83 @@
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# Название основной цели в текущем каталоге
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set(TRGT example-qt-posix-signal-watcher)
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# Список файлов исходных текстов
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set(TRGT_cpp ${CMAKE_CURRENT_SOURCE_DIR}/posix_signal_watcher.cpp)
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if(MYXLIB_BUILD_EXAMPLES)
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# Путь поиска библиотек внутри проекта
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link_directories(${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR})
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# Цель для создания исполняемого файла
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add_executable(${TRGT} ${TRGT_cpp})
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common_target_properties(${TRGT})
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# Создание цели для проверки утилитой clang-tidy
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add_clang_tidy_check(${TRGT} ${TRGT_cpp})
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# Создание цели для проверки утилитой clang-analyze
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add_clang_analyze_check(${TRGT} ${TRGT_cpp})
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# Создание цели для проверки утилитой clazy
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add_clazy_check(${TRGT} ${TRGT_cpp})
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# Создание цели для проверки утилитой pvs-studio
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add_pvs_check(${TRGT})
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# Создание цели для автоматического форматирования кода
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add_format_sources(${TRGT} ${TRGT_cpp})
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# Qt5
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target_include_directories(${TRGT} PRIVATE ${CMAKE_SOURCE_DIR}/src)
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target_include_directories(${TRGT} SYSTEM PUBLIC ${Qt5Core_INCLUDE_DIRS})
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target_include_directories(${TRGT} SYSTEM PRIVATE ${CMAKE_SOURCE_DIR}/src)
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add_dependencies(${TRGT} base qt)
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target_link_libraries(${TRGT} base_static qt_static)
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target_link_libraries(${TRGT} Qt5::Core)
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target_link_libraries(${TRGT} Threads::Threads)
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# Имя выходного файла для цели
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set_target_properties(${TRGT} PROPERTIES OUTPUT_NAME qt-posix-signal-watcher)
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add_sanitizers(${TRGT})
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cotire(${TRGT})
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add_dependencies(${TRGT} create_auxilary_symlinks)
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# Правила для установки
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install(TARGETS ${TRGT} COMPONENT examples RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
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endif()
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if(MYXLIB_BUILD_EXAMPLES_HO)
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set(TRGT_moc_hpp
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${CMAKE_SOURCE_DIR}/src/myx/qt/posix_signal_watcher.hpp
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${CMAKE_SOURCE_DIR}/src/myx/qt/posix_signal_watcher_p.hpp)
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qt5_wrap_cpp(TRGT_moc_cpp ${TRGT_moc_hpp})
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# Цель для создания исполняемого файла
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add_executable(${TRGT}-ho ${TRGT_cpp} ${TRGT_moc_cpp})
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common_target_properties(${TRGT}-ho)
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target_include_directories(${TRGT}-ho PRIVATE ${CMAKE_SOURCE_DIR}/src)
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target_include_directories(${TRGT}-ho SYSTEM PUBLIC ${Qt5Core_INCLUDE_DIRS})
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add_dependencies(${TRGT}-ho base-header-only qt-header-only)
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target_link_libraries(${TRGT}-ho Qt5::Core)
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target_link_libraries(${TRGT}-ho Threads::Threads)
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# Имя выходного файла для цели
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set_target_properties(${TRGT}-ho PROPERTIES OUTPUT_NAME qt-posix-signal-watcher-ho)
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add_sanitizers(${TRGT}-ho)
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cotire(${TRGT}-ho)
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add_dependencies(${TRGT}-ho create_auxilary_symlinks)
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# Правила для установки
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install(TARGETS ${TRGT}-ho COMPONENT examples RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
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endif()
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21
examples/qt/02_posix-signal-watcher/posix_signal_watcher.cpp
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21
examples/qt/02_posix-signal-watcher/posix_signal_watcher.cpp
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#include <myx/qt/posix_signal_watcher.hpp>
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#include <QCoreApplication>
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#include <QDebug>
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namespace MQ = myx::qt;
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int main( int argc, char* argv[] )
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{
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QCoreApplication app( argc, argv );
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qDebug() << "Hello from process" << QCoreApplication::applicationPid();
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MQ::PosixSignalWatcher sigwatch;
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sigwatch.watchForSignal( SIGINT );
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sigwatch.watchForSignal( SIGTERM );
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QObject::connect( &sigwatch, &MQ::PosixSignalWatcher::posixSignal, &app, &QCoreApplication::quit );
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int exitcode = app.exec();
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qDebug() << "Goodbye";
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return( exitcode );
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}
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@ -1 +1,2 @@
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add_subdirectory(01_translators)
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add_subdirectory(02_posix-signal-watcher)
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@ -4,23 +4,36 @@ set(TRGT qt)
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# cmake-format: off
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# Список файлов исходных текстов
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set(TRGT_cpp
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${CMAKE_CURRENT_SOURCE_DIR}/translators.cpp)
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${CMAKE_CURRENT_SOURCE_DIR}/posix_signal_watcher.cpp
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${CMAKE_CURRENT_SOURCE_DIR}/translators.cpp
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)
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set(TRGT_moc_hpp
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${CMAKE_CURRENT_SOURCE_DIR}/posix_signal_watcher.hpp
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)
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set(TRGT_moc_private_hpp
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${CMAKE_CURRENT_SOURCE_DIR}/posix_signal_watcher_p.hpp
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)
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# Список заголовочных файлов (используется для установки)
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set(TRGT_hpp
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${CMAKE_CURRENT_SOURCE_DIR}/backports.hpp
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${CMAKE_CURRENT_SOURCE_DIR}/translators.hpp)
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${CMAKE_CURRENT_SOURCE_DIR}/translators.hpp
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)
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set(TRGT_headers ${TRGT_hpp})
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set(TRGT_headers ${TRGT_moc_hpp} ${TRGT_hpp})
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# cmake-format: on
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qt5_wrap_cpp(TRGT_moc_cpp ${TRGT_moc_private_hpp} ${TRGT_moc_hpp})
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add_library(${TRGT}-header-only INTERFACE)
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target_include_directories(
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${TRGT}-header-only SYSTEM INTERFACE "$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include>"
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"$<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>"
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"$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>")
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if(MYXLIB_BUILD_LIBRARIES)
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add_common_library(${TRGT} OUTPUT_NAME myx-${TRGT} SOURCES ${TRGT_cpp} ${TRGT_headers})
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add_common_library(${TRGT} OUTPUT_NAME myx-${TRGT} SOURCES ${TRGT_cpp} ${TRGT_moc_cpp} ${TRGT_moc_private_hpp} ${TRGT_headers})
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common_target_properties(${TRGT})
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# Создание цели для проверки утилитой clang-tidy
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@ -36,11 +49,12 @@ if(MYXLIB_BUILD_LIBRARIES)
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add_pvs_check(${TRGT})
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# Создание цели для автоматического форматирования кода
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add_format_sources(${TRGT} ${TRGT_cpp} ${TRGT_headers})
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add_format_sources(${TRGT} ${TRGT_cpp} ${TRGT_headers} ${TRGT_moc_private_hpp})
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target_compile_definitions(${TRGT} PUBLIC MYXLIB_BUILD_LIBRARIES)
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target_include_directories(${TRGT} SYSTEM PUBLIC ${Qt5Core_INCLUDE_DIRS})
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target_include_directories(${TRGT} SYSTEM PRIVATE ${CMAKE_SOURCE_DIR}/src)
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target_include_directories(${TRGT} PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
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cotire(${TRGT})
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install(TARGETS ${TRGT}_static COMPONENT libs-dev ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
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136
src/myx/qt/posix_signal_watcher.cpp
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136
src/myx/qt/posix_signal_watcher.cpp
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@ -0,0 +1,136 @@
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#ifndef MYX_QT_POSIX_SIGNAL_WATCHER_CPP_
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#define MYX_QT_POSIX_SIGNAL_WATCHER_CPP_
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#include <myx/base/config.hpp>
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#ifndef MYXLIB_HEADER_ONLY
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#include <myx/qt/posix_signal_watcher_p.hpp>
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#include <myx/qt/posix_signal_watcher.hpp>
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#else
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#pragma once
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#endif
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namespace myx {
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namespace qt {
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int PosixSignalWatcherPrivate::m_sockpair[2] = {0, 0};
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PosixSignalWatcherPrivate::~PosixSignalWatcherPrivate() = default;
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PosixSignalWatcherPrivate::PosixSignalWatcherPrivate( PosixSignalWatcher* q ) :
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q_ptr( q )
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{
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#if MYX_QT_HAS_POSIX_SIGNALS
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// Create socket pair
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if ( ::socketpair( AF_UNIX, SOCK_STREAM, 0, m_sockpair ) )
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{
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qDebug() << "PosixSignalWatcher: socketpair: " << ::strerror( errno );
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return;
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}
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#endif
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// Create a notifier for the read end of the pair
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m_notifier.reset( new QSocketNotifier( m_sockpair[1], QSocketNotifier::Read ) );
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// Called when the signal handler has written to the socket pair.
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// Emits the Posix signal as a Qt signal.
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connect( m_notifier.get(), &QSocketNotifier::activated, q, [this]( int sockfd ) {
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Q_Q( PosixSignalWatcher );
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int signal = 0;
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(void)::read( sockfd, &signal, sizeof( signal ) );
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qDebug() << "Caught signal: " << ::strsignal( signal );
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Q_EMIT q->posixSignal( signal );
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} );
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m_notifier->setEnabled( true );
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}
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/*!
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* Registers a handler for the given Posix \a signal. The handler will write to
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* a socket pair, the other end of which is connected to a QSocketNotifier.
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* This provides a way to break out of the asynchronous context from which the
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* signal handler is called and back into the Qt event loop.
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*/
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void PosixSignalWatcherPrivate::watchForSignal( int signal )
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{
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if ( m_watchedSignals.contains( signal ) )
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{
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qDebug() << "Already watching for signal " << signal;
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return;
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}
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#if MYX_QT_HAS_POSIX_SIGNALS
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// Register a sigaction which will write to the socket pair
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struct sigaction sigact;
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sigact.sa_handler = PosixSignalWatcherPrivate::signalHandler;
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sigact.sa_flags = 0;
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sigemptyset( &sigact.sa_mask );
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sigact.sa_flags |= SA_RESTART;
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if ( ::sigaction( signal, &sigact, nullptr ) )
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{
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qDebug() << "PosixSignalWatcher: sigaction: " << ::strerror( errno );
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return;
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}
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#endif
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m_watchedSignals.append( signal );
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} // PosixSignalWatcherPrivate::watchForSignal
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/*!
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* Called when a Posix \a signal is received. Write to the socket to wake up the
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* QSocketNotifier.
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*/
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MYXLIB_INLINE void PosixSignalWatcherPrivate::signalHandler( int signal )
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{
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(void)::write( m_sockpair[0], &signal, sizeof( signal ) );
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}
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/*!
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* Create a new PosixSignalWatcher as a child of the given \a parent.
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*/
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MYXLIB_INLINE PosixSignalWatcher::PosixSignalWatcher( QObject* parent ) :
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QObject( parent ),
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d_ptr ( new PosixSignalWatcherPrivate( this ) )
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{
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}
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MYXLIB_INLINE PosixSignalWatcher::~PosixSignalWatcher() = default;
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/*!
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* Register a signal handler for the given \a signal.
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*
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* After calling this method you can \c connect() to the POSIXSignal() Qt signal
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* to be notified when the Posix signal is received.
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*/
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MYXLIB_INLINE void PosixSignalWatcher::watchForSignal( int signal )
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{
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Q_D( PosixSignalWatcher );
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d->watchForSignal( signal );
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}
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/*!
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* \fn void PosixSignalWatcher::posixSignal(int signal)
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* Emitted when the given Posix \a signal is received.
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*
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* watchForSignal() must be called for each Posix signal that you want to receive
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* via the POSIXSignal() Qt signal. If a watcher is watching multiple signals,
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* POSIXSignal() will be emitted whenever *any* of the watched Posix signals are
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* received, and the \a signal argument can be inspected to find out which one
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* was actually received.
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*/
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} // namespace qt
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} // namespace myx
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#endif // ifndef MYX_QT_POSIX_SIGNAL_WATCHER_CPP_
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55
src/myx/qt/posix_signal_watcher.hpp
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55
src/myx/qt/posix_signal_watcher.hpp
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#ifndef MYX_QT_POSIX_SIGNAL_WATCHER_HPP_
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#define MYX_QT_POSIX_SIGNAL_WATCHER_HPP_
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#pragma once
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#include <myx/base/config.hpp>
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#include <QObject>
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#include <csignal>
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namespace myx {
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namespace qt {
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class PosixSignalWatcherPrivate;
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#if defined( Q_OS_WIN )
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const int SIGINT = 2;
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const int SIGTERM = 15;
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#endif
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/*!
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* \brief The PosixSignalWatcher class converts Posix signals to Qt signals.
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*
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* To watch for a given signal, e.g. \c SIGINT, call \c watchForSignal(SIGINT)
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* and \c connect() your handler to posixSignal().
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*/
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class PosixSignalWatcher : public QObject
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{
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Q_OBJECT
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public:
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explicit PosixSignalWatcher( QObject* parent = nullptr );
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~PosixSignalWatcher();
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void watchForSignal( int signal );
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Q_SIGNAL void posixSignal( int signal );
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private:
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PosixSignalWatcherPrivate* const d_ptr = nullptr;
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Q_DECLARE_PRIVATE( PosixSignalWatcher )
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}; // class PosixSignalWatcher
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} // namespace qt
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} // namespace myx
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#ifdef MYXLIB_HEADER_ONLY
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#include "posix_signal_watcher_p.hpp"
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#include "posix_signal_watcher.cpp"
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#endif
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#endif // ifndef MYX_QT_POSIX_SIGNAL_WATCHER_HPP_
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62
src/myx/qt/posix_signal_watcher_p.hpp
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62
src/myx/qt/posix_signal_watcher_p.hpp
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#ifndef MYX_QT_POSIX_SIGNAL_WATCHER_P_HPP_
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#define MYX_QT_POSIX_SIGNAL_WATCHER_P_HPP_
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#include <myx/base/config.hpp>
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#include <myx/qt/posix_signal_watcher.hpp>
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#include <QObject>
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#include <QMap>
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#include <QSocketNotifier>
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#include <QtDebug>
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#include <memory>
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#ifdef Q_OS_WIN
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#define MYX_QT_HAS_POSIX_SIGNALS 0
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#else
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#define MYX_QT_HAS_POSIX_SIGNALS 1
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#endif
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#if MYX_QT_HAS_POSIX_SIGNALS
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#include <csignal>
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#include <sys/socket.h>
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#include <unistd.h>
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#include <cerrno>
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#endif
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namespace myx {
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namespace qt {
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/*!
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* \brief The PosixSignalWatcherPrivate class implements the back-end signal
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* handling for the PosixSignalWatcher.
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*
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* \see http://qt-project.org/doc/qt-5.0/qtdoc/POSIX-signals.html
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*/
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class PosixSignalWatcherPrivate : public QObject
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{
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Q_OBJECT
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public:
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PosixSignalWatcherPrivate( PosixSignalWatcher* q );
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~PosixSignalWatcherPrivate();
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void watchForSignal( int signal );
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static void signalHandler( int signal );
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private:
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PosixSignalWatcher* const q_ptr = nullptr;
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Q_DECLARE_PUBLIC( PosixSignalWatcher )
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static int m_sockpair[2];
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std::unique_ptr< QSocketNotifier > m_notifier;
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QList< int > m_watchedSignals;
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}; // class PosixSignalWatcherPrivate
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} // namespace qt
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} // namespace myx
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#endif // ifndef MYX_QT_POSIX_SIGNAL_WATCHER_P_HPP_
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