How to properly do a httpdaemon shutdown?

[pottendo]

Hi fellow-circlers,
I'm using the class CWebServer and my webserver is working quite well in my project.

How do I shutdown the webserver properly?

I've modified the 21-webserver example:

[...]
TShutdownMode CKernel::Run (void)
{
	m_Logger.Write (FromKernel, LogNotice, "Compile time: " __DATE__ " " __TIME__);

	CString IPString;
	m_Net.GetConfig ()->GetIPAddress ()->Format (&IPString);
	m_Logger.Write (FromKernel, LogNotice, "Open \"http://%s/\" in your web browser!",
			(const char *) IPString);

	{
	    CWebServer ws (&m_Net, &m_ActLED);

	    for (unsigned nCount = 0; nCount < 100000; nCount++)
	    {
		m_Scheduler.Yield ();
		m_Screen.Rotor (0, nCount);
	    }
	}
	m_Logger.Write (FromKernel, LogNotice, "shutting down...");

	return ShutdownHalt;
}

expecting the log-message "shutting down" after a few seconds.
But I get this:

00:00:09.41 dhcp: IP address is 192.168.1.31
00:00:09.41 kernel: Compile time: Jul 12 2025 16:37:31
00:00:09.42 kernel: Open "http://192.168.1.31/" in your web browser!
00:00:21.95 httpdaemon.cpp(75): stack[1] is 0xA61F4
00:00:21.95 httpdaemon.cpp(75): stack[11] is 0x80C14
00:00:21.96 httpdaemon.cpp(75): stack[15] is 0x80828
00:00:21.96 httpdaemon.cpp(75): assertion failed: m_pSocket == 0

the assertion is trigger in the destructor ~CHTTPDaemon().
m_Net is an Ethernet network, but the same happens for WiFi.

Any hints are much appreciated.
bye, pottendo

[rsta2]

Please start the web server using new CWebServer (&m_Net, &m_ActLED); and don't delete it before the shutdown. This should work for a system shutdown.

[pottendo]

Hi,
thanks for the quick reply!
Normally I do this, but I found some WiFi connection problems (maybe due to bad reception of my Pi4), which weren't recovered. So I thought that I shutdown the server and restart the entire network subsystem.
...however, this strategy turned out to be not working anyways, as I can't detect if a network is 'down'.
I tried:

• m_Net.IsRunning(): never returns 'false', even if WiFi isn't working.
• m_WPASupplicant.IsConnected(): always returns 'false', even if the network is working.

Wanted to file a separate question on those here... but if I can't dismantle the webserver and restart it, this strategy won't work, even if I can detect somehow that the network connection is down, correct?

thx, pottendo

[rsta2]

No, the model is, that the network subsystem (with or without WLAN) is only started once, and is shutdown once before system shutdown. It cannot be restarted. The WLAN should reconnect automatically, if it was disconnected.

m_Net.IsRunning() returns TRUE, when the network device layer is initialized and an IP address has been assigned (DHCP). m_WPASupplicant.IsConnected() returns, if the WPA connection is up. This status may need some time to be updated, because there are timeouts involved.

[pottendo]

hi,
OK understood.
I definitely had cases where the Wifi didn't recover - unfortunately I haven't saved the console log. Will do the next time. There was some indication and a bit of memory dump.
My Pi4 has a passive cooling solution (a larger metal chunk), maybe not optimal for Wifi reception. In general it has sufficient connectivity for my development cycles. I rarely use my own application... sometimes Wifi stops and doesn't recover.
So let's close the subject here and I'll open another one in case I have more information.
thanks for the support, pottendo