Question Linux: Socket.BeginReceiveFrom: Seems not working on Linux ... it doesnt Do anything

[LipkeGu]

Hi,

Im working currently on a project which is running fine on Windows (Compiling and receiving / sending datagrams via UDP).
On Linux the Function Socket.BeginReceiveFrom doesnt Do anything... it seems Async Sockets are not supported on linux.
If anyone has a solution for this problem, it would be nice to know about that. I can track it down to this Line: BaseSocket.cs

 

[JohnH]

Did you see remark in documentation about not using Begin/End-methods and use Async ones instead?

Socket.BeginReceiveFrom Method (System.Net.Sockets)

Begins to asynchronously receive data from a specified network device.

learn.microsoft.com

 

[LipkeGu]

Did you see remark in documentation about not using Begin/End-methods and use Async ones instead?

Socket.BeginReceiveFrom Method (System.Net.Sockets)

Begins to asynchronously receive data from a specified network device.

learn.microsoft.com

Ist there any example how to implement the Task Variant?

 

[JohnH]

Basically you call it like a synchronous method but put await operator in front of the call and async keyword on the method definition.

async keyword - C# reference

async - C# Reference

learn.microsoft.com

await operator - asynchronously wait for a task to complete - C# reference

The C# `await` operator asynchronously suspends evaluation of the enclosing `async` method.

learn.microsoft.com

 

[LipkeGu]

BaseSocket.cs
Ok, i changed it now to ReceiveFromAsync... And remove old clutter from the Socket, which isnt needed anymore. I hope later IT will now work in Linux.

 

[Skydiver]

Yikes? So you just check-in code into the main branch without testing first?

 

[LipkeGu]

Usally not, but i tested it under Windows. The Code is splitted in to Modules and Plugins. So ist is easier to maintain.

 

[LipkeGu]

I tested it and it does also not work.
It is exactly this line where the problem is:

                    var socketTask = await socket.ReceiveFromAsync(buffer, new IPEndPoint(IPAddress.Any, 0));

➜  net8.0 git:(master) ✗ sudo ./Netboot
NetBoot 1.0 (LE (LittleEndian))
[I] Host Platform: Linux
[I] Added Service for 'NONE'
[I] Added Service for 'TFTP'
[I] Added Service for 'DHCP'
[I] Added Service for 'BINL'
[I] DHCP: Bootserver behavior set to: WindowsDeploymentServer
[D] BaseSocket: Listening...
[D] BaseSocket: Listening...
[D] BaseSocket: Listening...

 

[Skydiver]

You'll need to be more descriptive than "it doesn't work." What error or behavior are you getting?

My recommendation is to start a minimal project to make it easier to reproduce the problem. Basically a simple console app as the server that just awaits a packet, and a simple console app that sends the packet. Put lots of tracing in both chunks of code. The open an issue in GitHub.