use a sane method to discover valid device nodes

2 files changed, 43 insertions, 14 deletions

diff --git a/libopie2/opiecore/oinputsystem.cpp b/libopie2/opiecore/oinputsystem.cpp
index d1a28f5..a2306ca 100644
--- a/libopie2/opiecore/oinputsystem.cpp
+++ b/libopie2/opiecore/oinputsystem.cpp
@@ -27,19 +27,21 @@
 */
 
 #include "oinputsystem.h"
 using namespace Opie::Core;
 
 /* QT */
+#include <qdir.h>
 #include <qfile.h>
 
 /* STD */
 #include <errno.h>
 #include <string.h>
 #include <sys/fcntl.h>
 #include <sys/ioctl.h>
+#include <unistd.h>
 
 #define     BUFSIZE 256
 #define     BIT_MASK( name, numbits )                                        \
     unsigned short  name[ ((numbits) - 1) / (sizeof( short ) * 8) + 1 ];    \
     memset( name, 0, sizeof( name ) )
 #define     BIT_TEST( bitmask, bit )    \
@@ -58,17 +60,28 @@ OInputSystem::OInputSystem() : QObject()
 }
 
 
 void OInputSystem::synchronize()
 {
     qDebug( "OInputSystem::synchronize()" );
-    if ( QFile::exists( "/dev/input/event0" ) ) _devices.insert( "0", new OInputDevice( this, "/dev/input/event0" ) );
-    if ( QFile::exists( "/dev/input/event1" ) ) _devices.insert( "1", new OInputDevice( this, "/dev/input/event1" ) );
-    if ( QFile::exists( "/dev/input/event2" ) ) _devices.insert( "2", new OInputDevice( this, "/dev/input/event2" ) );
-    if ( QFile::exists( "/dev/input/event3" ) ) _devices.insert( "3", new OInputDevice( this, "/dev/input/event3" ) );
+    QDir devInput( "/dev/input/" );
+    if ( devInput.exists() )
+    {
+        QStringList devInputFiles = devInput.entryList( QDir::System, QDir::Name );
+        for ( QStringList::Iterator it = devInputFiles.begin(); it != devInputFiles.end(); ++it )
+        {
+            QString absPath = devInput.absFilePath( *it );
+            bool isValid = OInputDevice::isValid( absPath );
+            qDebug( "OInputSystem::synchronize() - checking if '%s' is a valid input system node... '%s'",
+            (const char*) absPath, isValid ? "yes" : "no" );
+            if ( isValid ) _devices.insert( *it, new OInputDevice( this, absPath ) );
+        }
+    }
     qDebug( "OInputSystem::synchronize() done" );
+    if ( !_devices.count() )
+    qWarning( "OInputSystem::no devices found" );
 }
 
 
 OInputSystem::~OInputSystem()
 {
     qDebug( "OInputSystem::~OInputSystem()" );
@@ -103,13 +116,13 @@ OInputSystem::DeviceIterator OInputSystem::iterator() const
  * OInputDevice
  *======================================================================================*/
 
 OInputDevice::OInputDevice( QObject* parent, const char* name ) : QObject( parent, name )
 {
     qDebug( "OInputDevice::OInputDevice( '%s' )", name );
-    
+
     _fd = ::open( name, O_RDONLY );
     if ( _fd == -1 )
     {
         qDebug( "OInputDevice::OInputDevice() - Warning: couldn't open %s (%s)", name, strerror( errno ) );
     }
 }
@@ -145,13 +158,13 @@ QString OInputDevice::uniq() const
 }
 
 
 bool OInputDevice::hasFeature( Feature bit ) const
 {
     BIT_MASK( features, EV_MAX );
-            
+
     if( ioctl( _fd, EVIOCGBIT( 0, EV_MAX ), features) < 0 )
     {
         perror( "EVIOCGBIT" );
         return false;
     }
     else
@@ -188,10 +201,21 @@ QString OInputDevice::globalKeyMask() const
         QString keymask;
         for ( int i = 0; i < KEY_MAX; ++i )
         {
             if ( BIT_TEST( keys, i ) ) keymask.append( QString().sprintf( "%0d, ", i ) );
         }
         return keymask;
-        
+
     }
 }
 
+
+bool OInputDevice::isValid( const QString& path )
+{
+    char buf[BUFSIZE] = "<unknown>";
+    int fd = ::open( (const char*) path, O_RDONLY );
+    if ( fd < 0 ) return false;
+    int res = ::ioctl( fd, EVIOCGNAME(sizeof buf), buf );
+    ::close( fd );
+    return res >= 0;
+}
+
diff --git a/libopie2/opiecore/oinputsystem.h b/libopie2/opiecore/oinputsystem.h
index 7919610..6f822a1 100644
--- a/libopie2/opiecore/oinputsystem.h
+++ b/libopie2/opiecore/oinputsystem.h
@@ -74,31 +74,31 @@ class OInputSystem : public QObject
      * @internal Rebuild the internal interface database
      * @note Sometimes it might be useful to call this from client code,
      */
     void synchronize();
     /**
      * @internal destructor
-     */    
+     */
      ~OInputSystem();
- 
+
  protected:
     OInputSystem();
-    
+
     static OInputSystem* _instance;
     DeviceMap _devices;
 };
 
 
 class OInputDevice : public QObject
-{    
+{
   public:
     OInputDevice( QObject* parent, const char* name = 0 );
     ~OInputDevice();
 
-    #include "oinputsystemenums.h"    
-    
+    #include "oinputsystemenums.h"
+
   public:
     /**
      * @returns the identity string of this input device
      */
     QString identity() const;
     /**
@@ -120,13 +120,18 @@ class OInputDevice : public QObject
     bool isHeld( Key ) const;
     /**
      * @internal
      * @returns a string containing a printable form of the global keymask
      */
     QString globalKeyMask() const;
-    
+    /**
+     * @internal
+     * @returns whether a certain @a path corresponds to an input device
+     */
+    static bool isValid( const QString& path );
+
   private:
     int _fd;
     input_id _id;
 
 };