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System: Arch Linux + Cinnamon + Network Manager GLib version: 2.58.0-1

Take the following code:

#include <gio/gio.h>
#include <iostream>

int main ()
{
    GNetworkMonitor* monitor = g_network_monitor_get_default();
    std::cout << std::boolalpha << static_cast<bool>(g_network_monitor_get_network_available(monitor)) << std::endl;
    std::cout << g_network_monitor_get_connectivity(monitor) << std::endl;

    return 0;
}

Compiled with

g++ $(pkg-config --libs --cflags gio-2.0) main.cpp -o main

Then the result of this program is always

true
4

no matter if the WLAN connection (the only active connection) is turned on or off via the Cinnamon Network Manager applet. ip a confirms that the connection gets down.

Similarly, this Python code:

import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gio, Gtk
 
 
def network_status_changed(monitor, connected):
    print(f"xD {connected}")
 
 
network_monitor = Gio.NetworkMonitor.get_default()
network_monitor.connect('network-changed', network_status_changed)
print(network_monitor.get_connectivity())
 
Gtk.main()

always shows G_NETWORK_CONNECTIVITY_FULL and never executes the callback for the network-changed signal.

There are three interfaces in the system: lo, enpXsY (always down) and wlpXsY (down or up, depending on the case)

journalctl-xe shows no relevant errors