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<link rel="up" href="pt01.html" title="Part I. GIO Overview">
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Extending GIO
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A lot of the functionality that is accessible through GIO
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is implemented in loadable modules, and modules provide a convenient
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way to extend GIO. In addition to the GIOModule API which supports
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writing such modules, GIO has a mechanism to define extension points,
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and register implementations thereof, see GIOExtensionPoint.
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The following extension points are currently defined by GIO:
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G_VFS_EXTENSION_POINT_NAME.
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Allows to override the functionality of the GVfs class.
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Implementations of this extension point must be derived from GVfs.
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GIO uses the implementation with the highest priority that is active,
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see g_vfs_is_active().
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GIO implements this extension point for local files, gvfs contains
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an implementation that supports all the backends in gvfs.
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G_VOLUME_MONITOR_EXTENSION_POINT_NAME.
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Allows to add more volume monitors.
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Implementations of this extension point must be derived from
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GVolumeMonitor. GIO uses all registered extensions.
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gvfs contains an implementation that works together with the GVfs
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implementation in gvfs.
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G_NATIVE_VOLUME_MONITOR_EXTENSION_POINT_NAME.
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Allows to override the 'native' volume monitor.
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Implementations of this extension point must be derived from
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GNativeVolumeMonitor. GIO uses the implementation with
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the highest priority that is supported, as determined by the
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is_supported() vfunc in GVolumeMonitorClass.
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GIO implements this extension point for local mounts,
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gvfs contains a udisks2-based implementation.
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G_LOCAL_FILE_MONITOR_EXTENSION_POINT_NAME.
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Allows to override the file monitor implementation for
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local files. Implementations of this extension point must
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be derived from GLocalFileMonitor. GIO uses the implementation
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with the highest priority that is supported, as determined by the
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is_supported() vfunc in GLocalFileMonitorClass.
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GIO uses this extension point internally, to switch between
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its fam-based and inotify-based file monitoring implementations.
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G_LOCAL_DIRECTORY_MONITOR_EXTENSION_POINT_NAME.
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Allows to override the directory monitor implementation for
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local files. Implementations of this extension point must be
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derived from GLocalDirectoryMonitor. GIO uses the implementation
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with the highest priority that is supported, as determined by the
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is_supported() vfunc in GLocalDirectoryMonitorClass.
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GIO uses this extension point internally, to switch between
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its fam-based and inotify-based directory monitoring implementations.
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G_DESKTOP_APP_INFO_LOOKUP_EXTENSION_POINT_NAME.
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Unix-only. Allows to provide a way to associate default handlers
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with URI schemes. Implementations of this extension point must
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implement the GDesktopAppInfoLookup interface. GIO uses the
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implementation with the highest priority.
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This extension point has been discontinued in GLib 2.28. It is
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still available to keep API and ABI stability, but GIO is no
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longer using it for default handlers. Instead, the mime handler
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mechanism is used, together with x-scheme-handler pseudo-mimetypes.
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G_SETTINGS_BACKEND_EXTENSION_POINT_NAME.
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Allows to provide an alternative storage for GSettings.
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Implementations of this extension point must derive from the
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GSettingsBackend type. GIO contains a keyfile-based
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implementation of this extension point, another one is provided
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by dconf.
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G_PROXY_EXTENSION_POINT_NAME.
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Allows to provide implementations for network proxying.
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Implementations of this extension point must provide the
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GProxy interface, and must be named after the network
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protocol they are proxying.
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glib-networking contains an implementation of this extension
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point based on libproxy.
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G_TLS_BACKEND_EXTENSION_POINT_NAME.
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Allows to provide implementations for TLS support.
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Implementations of this extension point must implement
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the GTlsBackend interface.
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glib-networking contains an implementation of this extension
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point.
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G_NETWORK_MONITOR_EXTENSION_POINT_NAME.
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Allows to provide implementations for network connectivity
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monitoring.
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Implementations of this extension point must implement
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the GNetworkMonitorInterface interface.
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GIO contains an implementation of this extension point
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that is using the netlink interface of the Linux kernel.
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