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]