fd from NewConnection always zero

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Hi,

I'm trying to connect to an SPP profile with Device1.ConnectProfile. I have registered my side of the Profile (client role) with ProfileManager1.RegisterProfile. That all works fine and my NewConnection callback is invoked.

However, NewConnection is always getting an fd with value 0. I know the socket is actually correctly set up because I can see it in /proc/<pid>/fd and the remote device also shows the connection established. And if I hard code the fd to what is shown in /proc/<pid>/fd (it usually doesn't change between runs) I can successfully use it in a read call to get what the other end is sending.

Any ideas what I might be doing wrong? I'm on 5.33.

Below is a simplified version of my NewConnection handler. The debug statement prints out:

device = /org/bluez/hci0/dev_18_E2_C2_71_1B_5F, fd = 0

static void
profile_handle_new_connection (GDBusConnection       *connection,
                          const gchar           *sender,
                          const gchar           *object_path,
                          const gchar           *interface_name,
                          const gchar           *method_name,
                          GVariant              *parameters,
                          GDBusMethodInvocation *invocation,
                          gpointer               user_data)
{
    gint32 fd = -1;
    char *device = "";

    g_variant_get(parameters, "(&oh*)", &device, &fd, NULL);
    dbg("device = %s, fd = %d\n", device, fd);

    g_dbus_method_invocation_return_value(invocation, NULL);
}

Thanks!

Alan

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