--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/doc/src/snippets/code/doc_src_unix-signal-handlers.qdoc	Wed Mar 31 11:06:36 2010 +0300
@@ -0,0 +1,151 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//! [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]