From 71b24a42daccd45fe80b2a669c3a88cfc5dcf608 Mon Sep 17 00:00:00 2001
From: mickeyl <mickeyl>
Date: Fri, 16 Apr 2004 18:09:45 +0000
Subject: initial checkin of file and directory notifying classes

this is work in progress. don't look to close yet
---
(limited to 'libopie2/opiecore/ofilenotify.cpp')

diff --git a/libopie2/opiecore/ofilenotify.cpp b/libopie2/opiecore/ofilenotify.cpp
new file mode 100644
index 0000000..2242570
--- a/dev/null
+++ b/libopie2/opiecore/ofilenotify.cpp
@@ -0,0 +1,159 @@
+/*
+                            This file is part of the Opie Project
+             =.             Copyright (C) 2004 Michael 'Mickey' Lauer <mickey@Vanille.de>
+           .=l.             Copyright (C) The Opie Team <opie-devel@handhelds.org>
+          .>+-=
+_;:,     .>    :=|.         This program is free software; you can
+.> <`_,   >  .   <=         redistribute it and/or  modify it under
+:`=1 )Y*s>-.--   :          the terms of the GNU Library General Public
+.="- .-=="i,     .._        License as published by the Free Software
+- .   .-<_>     .<>         Foundation; either version 2 of the License,
+    ._= =}       :          or (at your option) any later version.
+   .%`+i>       _;_.
+   .i_,=:_.      -<s.       This program is distributed in the hope that
+    +  .  -:.       =       it will be useful,  but WITHOUT ANY WARRANTY;
+   : ..    .:,     . . .    without even the implied warranty of
+   =_        +     =;=|`    MERCHANTABILITY or FITNESS FOR A
+ _.=:.       :    :=>`:     PARTICULAR PURPOSE. See the GNU
+..}^=.=       =       ;     Library General Public License for more
+++=   -.     .`     .:      details.
+:     =  ...= . :.=-
+-.   .:....=;==+<;          You should have received a copy of the GNU
+ -_. . .   )=.  =           Library General Public License along with
+   --        :-=`           this library; see the file COPYING.LIB.
+                            If not, write to the Free Software Foundation,
+                            Inc., 59 Temple Place - Suite 330,
+                            Boston, MA 02111-1307, USA.
+*/
+
+#include "ofilenotify.h"
+using namespace Opie::Core;
+
+/* OPIE */
+
+/* QT */
+#include <qsignal.h>
+#include <qintdict.h>
+#include <qdir.h>
+
+/* STD */
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+#include <errno.h>
+
+namespace Opie {
+namespace Core {
+
+class OFileNotification
+{
+  public:
+    OFileNotification( QObject* receiver, const char* member, OFileNotificationType type ) : _type( type )
+    {
+        _signal.connect( receiver, member );
+    }
+    ~OFileNotification()
+    {
+    }
+
+    void activate()
+    {
+        _signal.activate();
+    }
+
+    OFileNotificationType type()
+    {
+        return _type;
+    }
+
+  private:
+    OFileNotificationType _type;
+    QSignal _signal;
+};
+
+
+static QIntDict<OFileNotification> notification_list;
+
+
+void OFileNotifier::singleShot( const QString& path, QObject* receiver, const char* member, OFileNotificationType type )
+{
+    int fd = ::open( (const char*) path, O_RDONLY );
+    if ( fd != -1 )
+    {
+        if ( notification_list.isEmpty() )
+        {
+            OFileNotifier::registerSignalHandler();
+        }
+        int result = ::fcntl( fd, F_SETSIG, SIGRTMIN );
+        if ( result == -1 )
+        {
+            qWarning( "OFileNotifier::singleShot(): Can't subscribe to '%s': %s.", (const char*) path, strerror( errno ) );
+            return;
+        }
+        result = ::fcntl( fd, F_NOTIFY, type );
+        if ( result == -1 )
+        {
+            qWarning( "OFileNotifier::singleShot(): Can't subscribe to '%s': %s.", (const char*) path, strerror( errno ) );
+            return;
+        }
+        qDebug( "OFileNotifier::singleShot(): Subscribed for changes to %s (fd = %d)", (const char*) path, fd );
+        notification_list.insert( fd, new OFileNotification( receiver, member, type ) );
+    }
+    else
+    {
+        qWarning( "OFileNotifier::singleShot(): Error with path '%s': %s.", (const char*) path, strerror( errno ) );
+    }
+}
+
+
+void OFileNotifier::__signalHandler( int sig, siginfo_t *si, void *data )
+{
+    qWarning( "OFileNotifier::__signalHandler(): reached." );
+    int fd = si->si_fd;
+    OFileNotification* fn = notification_list[fd];
+    if ( fn )
+    {
+        fn->activate();
+        #if 1
+        if ( !(fn->type() & Multi) )
+        {
+            qDebug( "OFileNotifier::__signalHandler(): '%d' was singleShot. Removing from list.", fd );
+            notification_list.remove( fd );
+            if ( notification_list.isEmpty() )
+            {
+                OFileNotifier::unregisterSignalHandler();
+            }
+        }
+        #endif
+    }
+    else
+    {
+        qWarning( "OFileNotifier::__signalHandler(): D'oh! Called without fd in notification_list. Race condition?" );
+    }
+}
+
+
+void OFileNotifier::registerSignalHandler()
+{
+    struct sigaction act;
+    act.sa_sigaction = OFileNotifier::__signalHandler;
+    ::sigemptyset( &act.sa_mask );
+    act.sa_flags = SA_SIGINFO;
+    ::sigaction( SIGRTMIN, &act, NULL );
+    qDebug( "OFileNotifier::registerSignalHandler(): done" );
+}
+
+
+void OFileNotifier::unregisterSignalHandler()
+{
+    struct sigaction act;
+    act.sa_sigaction = ( void (*)(int, siginfo_t*, void*) ) SIG_DFL;
+    sigemptyset( &act.sa_mask );
+    ::sigaction( SIGRTMIN, &act, NULL );
+    qDebug( "OFileNotifier::unregisterSignalHandler(): done" );
+}
+
+
+}
+}
--
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