Virtual serial ports

Hello,

I want to add virtual serial ports to a macOS VM (host = Sonoma, guest = Sonoma).

Here is what I tried so far:

option 1

I create a VZVirtioConsoleDeviceConfiguration and I add a port to it, with a VZFileHandleSerialPortAttachment connected to two pipes:

let consoleDeviceConfiguration = VZVirtioConsoleDeviceConfiguration()
let guestPort = VZVirtioConsolePortConfiguration()
guestPort.isConsole = false
guestPort.name = "myserialport"
 
let guestToHostPipe = Pipe()
let hostToGuestPipe = Pipe()
guestPort.attachment = VZFileHandleSerialPortAttachment(
    fileHandleForReading: hostToGuestPipe.fileHandleForReading,
    fileHandleForWriting: guestToHostPipe.fileHandleForWriting
)
 
consoleDeviceConfiguration.ports[0] = guestPort
 
// config is my VZVirtualMachineConfiguration
config.consoleDevices = [consoleDeviceConfiguration]
 

Then after the VZVirtualMachine is instantiated, I get the runtime VZVirtioConsoleDevice for my device and I set my service as its delegate.

In the guest system, the device is created with the expected name (/dev/cu.myserialport)

When I open it (e.g. screen /dev/cu.myserialport 9600), the consoleDevice(_:,didOpen:) delegate method is called as expected. Then I start sending data to hostToGuestPipe.fileHandleForWriting, but I get nothing in my guest system.

option 2

Instead of using config.consoleDevices, I add a VZVirtioConsoleDeviceSerialPortConfiguration to config.serialPorts and I use the same scheme as above with a VZFileHandleSerialPortAttachment and two pipes.

It works, but:

• I can't find a way to rename the devices (/dev/cu.virtio, /dev/cu.virtio1, etc)
• I can't detect when the endpoint is opened/closed.

Am I missing something?