GNetworkMonitor

typedef struct _GNetworkMonitor GNetworkMonitor;

GNetworkMonitor monitors the status of network connections and indicates when a possibly-user-visible change has occurred.

Since 2.32

struct GNetworkMonitorInterface

struct GNetworkMonitorInterface {
  GTypeInterface g_iface;

  void     (*network_changed)  (GNetworkMonitor      *monitor,
				gboolean              available);

  gboolean (*can_reach)        (GNetworkMonitor      *monitor,
				GSocketConnectable   *connectable,
				GCancellable         *cancellable,
				GError              **error);
  void     (*can_reach_async)  (GNetworkMonitor      *monitor,
				GSocketConnectable   *connectable,
				GCancellable         *cancellable,
				GAsyncReadyCallback   callback,
				gpointer              user_data);
  gboolean (*can_reach_finish) (GNetworkMonitor      *monitor,
				GAsyncResult         *result,
				GError              **error);
};

G_NETWORK_MONITOR_EXTENSION_POINT_NAME

#define G_NETWORK_MONITOR_EXTENSION_POINT_NAME "gio-network-monitor"

Extension point for network status monitoring functionality. See Extending GIO.

Since 2.30

g_network_monitor_get_default ()

GNetworkMonitor *   g_network_monitor_get_default       (void);

Gets the default GNetworkMonitor for the system.

Since 2.32

g_network_monitor_get_network_available ()

gboolean            g_network_monitor_get_network_available
                                                        (GNetworkMonitor *monitor);

Checks if the network is available. "Available" here means that the system has a default route available for at least one of IPv4 or IPv6. It does not necessarily imply that the public Internet is reachable. See "network-available" for more details.

Since 2.32

g_network_monitor_can_reach ()

gboolean            g_network_monitor_can_reach         (GNetworkMonitor *monitor,
                                                         GSocketConnectable *connectable,
                                                         GCancellable *cancellable,
                                                         GError **error);

Attempts to determine whether or not the host pointed to by connectable can be reached, without actually trying to connect to it.

This may return TRUE even when "network-available" is FALSE, if, for example, monitor can determine that connectable refers to a host on a local network.

If monitor believes that an attempt to connect to connectable will succeed, it will return TRUE. Otherwise, it will return FALSE and set error to an appropriate error (such as G_IO_ERROR_HOST_UNREACHABLE).

Note that although this does not attempt to connect to connectable, it may still block for a brief period of time (eg, trying to do multicast DNS on the local network), so if you do not want to block, you should use g_network_monitor_can_reach_async().

Since 2.32

g_network_monitor_can_reach_async ()

void                g_network_monitor_can_reach_async   (GNetworkMonitor *monitor,
                                                         GSocketConnectable *connectable,
                                                         GCancellable *cancellable,
                                                         GAsyncReadyCallback callback,
                                                         gpointer user_data);

Asynchronously attempts to determine whether or not the host pointed to by connectable can be reached, without actually trying to connect to it.

For more details, see g_network_monitor_can_reach().

When the operation is finished, callback will be called. You can then call g_network_monitor_can_reach_finish() to get the result of the operation.

g_network_monitor_can_reach_finish ()

gboolean            g_network_monitor_can_reach_finish  (GNetworkMonitor *monitor,
                                                         GAsyncResult *result,
                                                         GError **error);

Finishes an async network connectivity test. See g_network_monitor_can_reach_async().

The "network-available" property

  "network-available"        gboolean              : Read

Whether the network is considered available. That is, whether the system has a default route for at least one of IPv4 or IPv6.

Real-world networks are of course much more complicated than this; the machine may be connected to a wifi hotspot that requires payment before allowing traffic through, or may be connected to a functioning router that has lost its own upstream connectivity. Some hosts might only be accessible when a VPN is active. Other hosts might only be accessible when the VPN is not active. Thus, it is best to use g_network_monitor_can_reach() or g_network_monitor_can_reach_async() to test for reachability on a host-by-host basis. (On the other hand, when the property is FALSE, the application can reasonably expect that no remote hosts at all are reachable, and should indicate this to the user in its UI.)

See also "network-changed".

Default value: FALSE

Since 2.32

The "network-changed" signal

void                user_function                      (GNetworkMonitor *monitor,
                                                        gboolean         available,
                                                        gpointer         user_data)      : Run Last

Emitted when the network configuration changes. If available is TRUE, then some hosts may be reachable that were not reachable before, while others that were reachable before may no longer be reachable. If available is FALSE, then no remote hosts are reachable.

Since 2.32