Random error while waiting for pin interrupts

Describe the bug

Steps to reproduce

• Open Jacdac.sln in https://github.com/microsoft/jacdac-dotnet
• Deploy Jacdac.NET.Playground to a raspberry pi equipped with https://microsoft.github.io/jacdac-docs/devices/microsoft/research/jmspibridgev37v37
• launch dotnet System.NET.Playground.dll spi devtools

Expected behavior

Don’t crash or provide a way to handle issue.

Actual behavior

Unhandled exception. System.IO.IOException: Error while waiting for pin interrupts.
   at System.Device.Gpio.Drivers.SysFsDriver.WasEventDetected(Int32 pollFileDescriptor, Int32 valueFileDescriptor, Int32& pinNumber, CancellationToken cancellationToken)
   at System.Device.Gpio.Drivers.SysFsDriver.DetectEvents()
   at System.Threading.Thread.StartCallback()

Versions used

pi@raspberrypi:~/dotnet $ dotnet --info
.NET SDK (reflecting any global.json):
 Version:   6.0.101
 Commit:    ef49f6213a

Runtime Environment:
 OS Name:     raspbian
 OS Version:  11
 OS Platform: Linux
 RID:         linux-arm
 Base Path:   /home/pi/.dotnet/sdk/6.0.101/

Host (useful for support):
  Version: 6.0.1
  Commit:  3a25a7f1cc

.NET SDKs installed:
  6.0.101 [/home/pi/.dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 6.0.1 [/home/pi/.dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 6.0.1 [/home/pi/.dotnet/shared/Microsoft.NETCore.App]

[pgrawehr]

@pelikhan We’ve been having a few problems using SysFs in the past. I don’t remember exactly what we did there about that. I think catching the exception and retrying was normally working. However, since SysFs is deprecated and slow, we switched to using libgpiod as default low-level library when it’s available.

So just run sudo apt install -y libgpiod-dev and the library should pick it up automatically. I’ve never seen the above error with libgpiod and it is orders of magnitude faster (compare #1470).

[pgrawehr]

Try installing libgpiod-dev. That should work around the problem.