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author | Qt Continuous Integration System <qt-info@nokia.com> | 2011-06-20 12:29:01 (GMT) |
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committer | Qt Continuous Integration System <qt-info@nokia.com> | 2011-06-20 12:29:01 (GMT) |
commit | 59de8f1c2aa210dcbbaed49666719bdb3d1d0e86 (patch) | |
tree | 6d06d471e775e8a0634c0c2ee299351cf0ea3aa5 /doc/src/snippets/code/doc_src_unix-signal-handlers.cpp | |
parent | 65b50fe8ad59c8f68fbe56286c2d5a99687ea545 (diff) | |
parent | 73d32fe11943ba710f73a10676a8f3999a8f9104 (diff) | |
download | Qt-59de8f1c2aa210dcbbaed49666719bdb3d1d0e86.zip Qt-59de8f1c2aa210dcbbaed49666719bdb3d1d0e86.tar.gz Qt-59de8f1c2aa210dcbbaed49666719bdb3d1d0e86.tar.bz2 |
Merge branch 'master' of git://scm.dev.nokia.troll.no/qt/qt-doc-team
* 'master' of git://scm.dev.nokia.troll.no/qt/qt-doc-team: (1968 commits)
Doc: Fixed spelling errors that were blocking the CI system.
Added missing license headers.
DEF file updates for Symbian
QTBUG-19883 Adding top level TRAP for QThreads on Symbian
Added missing license headers.
Revert "QFileInfoGatherer: call QFileSystemWatcher addPaths from proper thread"
Fix alignment value not handled in ODF
Silence a compiler warning about unhandled enum in switch
Silence the "array out of bounds" warning in GCC 4.6.
Silence the callgrind warnings in our source code when using gcc 4.6
Create a function that merges the SSE common code
Improve toLatin1 x86 SIMD by using a new SSE4.1 instruction
Revert "Fix compilation of lrelease on Windows"
QFileInfoGatherer: call QFileSystemWatcher addPaths from proper thread
Also test http proxy in the QTcpServer benchmark
Symbian QFileSystemWatcher: fix potential crash
Enable QTcpServer benchmark on symbian
Fix building the OpenVG graphicssystem on Linux with static libs
fix build on windows 7
Fix compilation of lrelease on Windows
...
Diffstat (limited to 'doc/src/snippets/code/doc_src_unix-signal-handlers.cpp')
-rw-r--r-- | doc/src/snippets/code/doc_src_unix-signal-handlers.cpp | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/doc/src/snippets/code/doc_src_unix-signal-handlers.cpp b/doc/src/snippets/code/doc_src_unix-signal-handlers.cpp new file mode 100644 index 0000000..fd5f386 --- /dev/null +++ b/doc/src/snippets/code/doc_src_unix-signal-handlers.cpp @@ -0,0 +1,150 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the documentation of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** You may use this file under the terms of the BSD license as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor +** the names of its contributors may be used to endorse or promote +** products derived from this software without specific prior written +** permission. +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** $QT_END_LICENSE$ +** +****************************************************************************/ + +//! [0] +class MyDaemon : public QObject +{ + Q_OBJECT + + public: + MyDaemon(QObject *parent = 0, const char *name = 0); + ~MyDaemon(); + + // Unix signal handlers. + static void hupSignalHandler(int unused); + static void termSignalHandler(int unused); + + public slots: + // Qt signal handlers. + void handleSigHup(); + void handleSigTerm(); + + private: + static int sighupFd[2]; + static int sigtermFd[2]; + + QSocketNotifier *snHup; + QSocketNotifier *snTerm; +}; +//! [0] + + +//! [1] +MyDaemon::MyDaemon(QObject *parent, const char *name) + : QObject(parent,name) +{ + if (::socketpair(AF_UNIX, SOCK_STREAM, 0, sighupFd)) + qFatal("Couldn't create HUP socketpair"); + + if (::socketpair(AF_UNIX, SOCK_STREAM, 0, sigtermFd)) + qFatal("Couldn't create TERM socketpair"); + snHup = new QSocketNotifier(sighupFd[1], QSocketNotifier::Read, this); + connect(snHup, SIGNAL(activated(int)), this, SLOT(handleSigHup())); + snTerm = new QSocketNotifier(sigtermFd[1], QSocketNotifier::Read, this); + connect(snTerm, SIGNAL(activated(int)), this, SLOT(handleSigTerm())); + + ... +} +//! [1] + + +//! [2] +static int setup_unix_signal_handlers() +{ + struct sigaction hup, term; + + hup.sa_handler = MyDaemon::hupSignalHandler; + sigemptyset(&hup.sa_mask); + hup.sa_flags = 0; + hup.sa_flags |= SA_RESTART; + + if (sigaction(SIGHUP, &hup, 0) > 0) + return 1; + + term.sa_handler = MyDaemon::termSignalHandler; + sigemptyset(&term.sa_mask); + term.sa_flags |= SA_RESTART; + + if (sigaction(SIGTERM, &term, 0) > 0) + return 2; + + return 0; +} +//! [2] + + +//! [3] +void MyDaemon::hupSignalHandler(int) +{ + char a = 1; + ::write(sighupFd[0], &a, sizeof(a)); +} + +void MyDaemon::termSignalHandler(int) +{ + char a = 1; + ::write(sigtermFd[0], &a, sizeof(a)); +} +//! [3] + + +//! [4] +void MyDaemon::handleSigTerm() +{ + snTerm->setEnabled(false); + char tmp; + ::read(sigtermFd[1], &tmp, sizeof(tmp)); + + // do Qt stuff + + snTerm->setEnabled(true); +} + +void MyDaemon::handleSigHup() +{ + snHup->setEnabled(false); + char tmp; + ::read(sighupFd[1], &tmp, sizeof(tmp)); + + // do Qt stuff + + snHup->setEnabled(true); +} +//! [4] |