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authorAlexis Menard <alexis.menard@nokia.com>2009-04-17 14:06:06 (GMT)
committerAlexis Menard <alexis.menard@nokia.com>2009-04-17 14:06:06 (GMT)
commitf15b8a83e2e51955776a3f07cb85ebfc342dd8ef (patch)
treec5dc684986051654898db11ce73e03b9fec8db99 /doc/src/snippets/code/doc_src_unix-signal-handlers.qdoc
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Initial import of statemachine branch from the old kinetic repository
Diffstat (limited to 'doc/src/snippets/code/doc_src_unix-signal-handlers.qdoc')
-rw-r--r--doc/src/snippets/code/doc_src_unix-signal-handlers.qdoc110
1 files changed, 110 insertions, 0 deletions
diff --git a/doc/src/snippets/code/doc_src_unix-signal-handlers.qdoc b/doc/src/snippets/code/doc_src_unix-signal-handlers.qdoc
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+++ b/doc/src/snippets/code/doc_src_unix-signal-handlers.qdoc
@@ -0,0 +1,110 @@
+//! [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]