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docs: Document more extension points

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GIO is more extensible than we know! Document more of the existing
extension points, their included implementations and their purpose.
This commit is contained in:
Matthias Clasen 2025-01-20 20:22:06 -05:00 committed by Philip Withnall
parent 26bc1d08ec
commit d760bfef00
1 changed files with 46 additions and 7 deletions
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docs/reference/gio/overview.md
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@ -255,7 +255,7 @@ GIO inspects a few environment variables in addition to the ones used by GLib.
implementation for local files that is included in GIO has the name
"local", the implementation in the gvfs module has the name "gvfs". Most
commonly, system software will set this to "local" to avoid having `GFile`
APIs perform unnecessary D-Bus calls. The special value help can be used
APIs perform unnecessary D-Bus calls. The special value "help" can be used
to print a list of available implementations to standard output.
The following environment variables are only useful for debugging GIO itself
@ -267,19 +267,34 @@ environment.
purposes. The GFileMonitor implementation for local files that is included
in GIO on Linux has the name "inotify", others that are built are built as
modules (depending on the platform) are called "fam" and "fen". The
special value help can be used to print a list of available
special value "help" can be used to print a list of available
implementations to standard output.
- `GIO_USE_VOLUME_MONITOR`. This variable can be set to the name of a
GVolumeMonitor implementation to override the default for debugging
purposes. The GVolumeMonitor implementation for local files that is
included in GIO has the name "unix", the udisks2-based implementation in
the gvfs module has the name "udisks2". The special value help can be used
the gvfs module has the name "udisks2". The special value "help" can be used
to print a list of available implementations to standard output.
- `GIO_USE_MEMORY_MONITOR`. This variable can be set to the name of a
GMemoryMonitory implementation to override the default for debugging
purposes. The available implementations included in GIO have the names
"dbus", "portal" and "win32". The special value "help" can be used
to print a list of available implementations to standard output.
- `GIO_USE_NETWORK_MONITOR`. This variable can be set to the name of a
GNetworkMonitor implementation to override the default for debugging
purposes. The available implementations included in GIO have the names
"netlink", "networkmanager" and "portal". The special value "help" can
be used to print a list of available implementations to standard output.
- `GIO_USE_POWER_PROFILE_MONITOR`. This variable can be set to the name of a
GPowerProfileMonitor implementation to override the default for debugging
purposes. The available implementations included in GIO have the names
"dbus" and "portal". The special value "help" can be used to print a list
of available implementations to standard output.
- `GIO_USE_TLS`. This variable can be set to the name of a GTlsBackend
implementation to override the default for debugging purposes. GIO does
not include a GTlsBackend implementation, the gnutls-based implementation
in the glib-networking module has the name "gnutls". The special value
help can be used to print a list of available implementations to standard
"help" can be used to print a list of available implementations to standard
output.
- `GIO_USE_PORTALS`. This variable can be set to override detection of portals
and force them to be used to provide various bits of GIO functionality, for
@ -292,11 +307,16 @@ environment.
a set of paths separated by a colon, GIO will attempt to load additional
modules from within the path. This environment variable is ignored when
running in a setuid program.
- `GNOTIFICATION_BACKEND`. This variable can be set to the name of a
GNotificationBackend implementation to override the default for debugging
purposes. The implementations that are included in GIO have the names
"freedesktop", "cocoa", "gtk" and "portal". The special value "help" can
be used to print a list of available implementations to standard output.
- `GSETTINGS_BACKEND`. This variable can be set to the name of a
GSettingsBackend implementation to override the default for debugging
purposes. The memory-based implementation that is included in GIO has the
name "memory", the one in dconf has the name "dconf". The special value
help can be used to print a list of available implementations to standard
"help" can be used to print a list of available implementations to standard
output.
- `GSETTINGS_SCHEMA_DIR`. This variable can be set to the names of
directories to consider when looking for compiled schemas for GSettings,
@ -388,6 +408,12 @@ The following extension points are currently defined by GIO:
It is still available to keep API and ABI stability, but GIO is no longer
using it for default handlers. Instead, the mime handler mechanism is
used, together with x-scheme-handler pseudo-mimetypes.
- `G_NOTIFICATION_BACKEND_EXTENSION_POINT_NAME`. Allows to provide an
alternative implementation for sending notifications. Implementations of
this extension point must derive from the GNotificationBackend type. GIO
contains implementations based on the freedesktop notification D-Bus
interface, the macOS Cocoa API, the gnome-shell D-Bus API, and the desktop
portal for this functionality.
- `G_SETTINGS_BACKEND_EXTENSION_POINT_NAME`. Allows to provide an
alternative storage for GSettings. Implementations of this extension point
must derive from the GSettingsBackend type. GIO contains a keyfile-based
@ -404,5 +430,18 @@ The following extension points are currently defined by GIO:
- `G_NETWORK_MONITOR_EXTENSION_POINT_NAME`. Allows to provide
implementations for network connectivity monitoring. Implementations of
this extension point must implement the GNetworkMonitorInterface
interface. GIO contains an implementation of this extension point that is
using the netlink interface of the Linux kernel.
interface. GIO contains implementations of this extension point that use
the netlink interface of the Linux kernel, the NetworkManager D-Bus interface
and the desktop portal for this functionality.
- `G_MEMORY_MONITOR_EXTENSION_POINT_NAME`. Allows to provide
implementations for memory usage monitoring. Implementations of this
extension point must implement the GMemoryMonitorInterface interface.
GIO contains implementations of this extension point that use the
org.freedesktop.LowMemoryMonitor D-Bus interface, the Windows API and
the desktop portal for this functionality.
- `G_POWER_PROFILE_MONITOR_EXTENSION_POINT_NAME`. Allows to provide
implementations for power usage monitoring. Implementations of this
extension point must implement the GPowerProfileMonitorInterface interface.
GIO contains implementations of this extension point that use the
net.hadess.PowerProfiles D-Bus interface and the desktop portal for
this functionality.