System.IO.IOException: Invalid handle to path "[Unknown]" on Mono

[bnuzhouwei]

The error still exits in Mono:

import clr, System
from Pty.Net import *
class Pty:
    def __init__(self, name, cols=180, rows=500):
        self.name = name
        self.started = ph.dd.now()
        self.host = "127.0.0.1"
        self.cols = cols
        self.rows = rows
        app = "/bin/bash"
        options = PtyOptions()
        options.Name = name
        options.Cols = 180
        options.Rows = 500
        options.Cwd = "/root"
        options.App = app
        self.pty = PtyProvider.SpawnAsync(options, System.Threading.CancellationToken()).GetAwaiter().GetResult()
pty = Pty("lo")

System.IO.IOException: Invalid handle to path "[Unknown]"
  at System.IO.FileStream.Init (Microsoft.Win32.SafeHandles.SafeFileHandle safeHandle, System.IO.FileAccess access, System.Boolean ownsHandle, System.Int32 bufferSize, System.Boolean isAsync, System.Boolean isConsoleWrapper) [0x0006a] in <a5426229307d4283803b6b7e2cdc86e0>:0 
  at System.IO.FileStream..ctor (Microsoft.Win32.SafeHandles.SafeFileHandle handle, System.IO.FileAccess access, System.Int32 bufferSize, System.Boolean isAsync) [0x00011] in <a5426229307d4283803b6b7e2cdc86e0>:0 
  at Pty.Net.Unix.PtyStream..ctor (System.Int32 fd, System.IO.FileAccess fileAccess) [0x0000d] in <c5151a3d755045f2a06d1d18f46d910c>:0 
  at (wrapper remoting-invoke-with-check) Pty.Net.Unix.PtyStream..ctor(int,System.IO.FileAccess)
  at Pty.Net.Unix.PtyConnection..ctor (System.Int32 controller, System.Int32 pid) [0x00012] in <c5151a3d755045f2a06d1d18f46d910c>:0 
  at Pty.Net.Linux.PtyConnection..ctor (System.Int32 controller, System.Int32 pid) [0x00000] in <c5151a3d755045f2a06d1d18f46d910c>:0 
  at Pty.Net.Linux.PtyProvider.StartTerminalAsync (Pty.Net.PtyOptions options, System.Diagnostics.TraceSource trace, System.Threading.CancellationToken cancellationToken) [0x0011f] in <c5151a3d755045f2a06d1d18f46d910c>:0 
  at Pty.Net.PtyProvider.SpawnAsync (Pty.Net.PtyOptions options, System.Threading.CancellationToken cancellationToken) [0x0007b] in <c5151a3d755045f2a06d1d18f46d910c>:0 
  at (wrapper delegate-invoke) 

[RHamers]

Did you manage to figure this one out?

[bnuzhouwei]

Did you manage to figure this one out?

No, I have upgrade my appliction to net6, so i gived up .

[RHamers]

@javierdlg Do you have some input here maybe? I'm on Ubuntu 22.04 with Mono btw.

[RHamers]

Seems related to this bug in mono.

[javierdlg]

@RHamers seems like you've found the root bug for this issue. Could you try using .Net 6 or higher instead of Mono?

[RHamers]

Hey, yeah I'm trying a different approach yet I haven't gotten it to work properly. I'm bound to Mono however, I have a solution working on Windows which works.

I pulled the nuget package into a new dotnet8 project and build a thin API around vs-pty using TCP clients. Then I can simply build a self-contained app and run it on the target platform. This works perfectly fine for windows, yet on ubuntu 22.04 I get a segfault during start up, which I think is related to this.

My next step was to rollback to an earlier version of dotnet and try it that way.

[RHamers]

It seems when I build with dotnet6 I dont get the segfault error. I have no output though, but that's likely an issue on my side. I'll try and fix it.

[RHamers]

OK, I fixed it by starting "/bin/bash" instead of "sh" as app on Ubuntu 22.04. :D