Kaimon crashes on startup on Windows (opening file "/dev/tty")

cstjean commented

2026-05-25 21:57:48 -07:00

(Migrated from github.com)

Not sure if this is a Kaimon or a Tachikoma issue.

I don't think my setup is particularly exotic. The original setup worked fine, but afterwards I get this:

PS C:\Users\me> kaimon
ERROR: SystemError: opening file "/dev/tty": No such file or directory
Stacktrace:
  [1] systemerror(p::String, errno::Int32; extrainfo::Nothing)
    @ Base .\error.jl:186
  [2] open(fname::String; lock::Bool, read::Nothing, write::Nothing, create::Nothing, truncate::Bool, append::Nothing)
    @ Base .\iostream.jl:317
  [3] open
    @ .\iostream.jl:296 [inlined]
  [4] open(fname::String, mode::String; lock::Bool)
    @ Base .\iostream.jl:380
  [5] open
    @ .\iostream.jl:379 [inlined]
  [6] _start_stdout_capture!()
    @ Kaimon C:\Users\a1058035\.julia\packages\Kaimon\6N7iB\src\tui\io.jl:211
  [7] init!(m::Kaimon.KaimonModel, _t::Tachikoma.Terminal)
    @ Kaimon C:\Users\a1058035\.julia\packages\Kaimon\6N7iB\src\tui\lifecycle.jl:212
  [8] (::Tachikoma.var"#229#230"{Int64, Bool, Kaimon.KaimonModel, Base.RefValue{Any}, Base.RefValue{Any}, Base.RefValue{Bool}})(t::Tachikoma.Terminal)
    @ Tachikoma C:\Users\a1058035\.julia\packages\Tachikoma\vrBon\src\app.jl:1011
  [9] with_terminal(f::Tachikoma.var"#229#230"{Int64, Bool, Kaimon.KaimonModel, Base.RefValue{Any}, Base.RefValue{Any}, Base.RefValue{Bool}}; tty_out::Nothing, tty_size::Nothing, on_stdout::Nothing, on_stderr::Nothing)
    @ Tachikoma C:\Users\a1058035\.julia\packages\Tachikoma\vrBon\src\terminal.jl:1515
 [10] with_terminal
    @ C:\Users\a1058035\.julia\packages\Tachikoma\vrBon\src\terminal.jl:1493 [inlined]
 [11] app(model::Kaimon.KaimonModel; fps::Int64, default_bindings::Bool, on_stdout::Nothing, on_stderr::Nothing, tty_out::Nothing, tty_size::Nothing)
    @ Tachikoma C:\Users\a1058035\.julia\packages\Tachikoma\vrBon\src\app.jl:1010
 [12] invokelatest
    @ .\Base_compiler.jl:250 [inlined]
 [13] tui(; port::Int64, theme_name::Nothing, revise_polling::Bool, revise_mod::Nothing)
    @ Kaimon C:\Users\a1058035\.julia\packages\Kaimon\6N7iB\src\tui\lifecycle.jl:440
 [14] main(ARGS::Vector{String})
    @ Kaimon C:\Users\a1058035\.julia\packages\Kaimon\6N7iB\src\Kaimon.jl:2657
 [15] _start()
    @ Base .\client.jl:556

Not sure if this is a Kaimon or a Tachikoma issue. I don't think my setup is particularly exotic. The original setup worked fine, but afterwards I get this: ```julia PS C:\Users\me> kaimon ERROR: SystemError: opening file "/dev/tty": No such file or directory Stacktrace: [1] systemerror(p::String, errno::Int32; extrainfo::Nothing) @ Base .\error.jl:186 [2] open(fname::String; lock::Bool, read::Nothing, write::Nothing, create::Nothing, truncate::Bool, append::Nothing) @ Base .\iostream.jl:317 [3] open @ .\iostream.jl:296 [inlined] [4] open(fname::String, mode::String; lock::Bool) @ Base .\iostream.jl:380 [5] open @ .\iostream.jl:379 [inlined] [6] _start_stdout_capture!() @ Kaimon C:\Users\a1058035\.julia\packages\Kaimon\6N7iB\src\tui\io.jl:211 [7] init!(m::Kaimon.KaimonModel, _t::Tachikoma.Terminal) @ Kaimon C:\Users\a1058035\.julia\packages\Kaimon\6N7iB\src\tui\lifecycle.jl:212 [8] (::Tachikoma.var"#229#230"{Int64, Bool, Kaimon.KaimonModel, Base.RefValue{Any}, Base.RefValue{Any}, Base.RefValue{Bool}})(t::Tachikoma.Terminal) @ Tachikoma C:\Users\a1058035\.julia\packages\Tachikoma\vrBon\src\app.jl:1011 [9] with_terminal(f::Tachikoma.var"#229#230"{Int64, Bool, Kaimon.KaimonModel, Base.RefValue{Any}, Base.RefValue{Any}, Base.RefValue{Bool}}; tty_out::Nothing, tty_size::Nothing, on_stdout::Nothing, on_stderr::Nothing) @ Tachikoma C:\Users\a1058035\.julia\packages\Tachikoma\vrBon\src\terminal.jl:1515 [10] with_terminal @ C:\Users\a1058035\.julia\packages\Tachikoma\vrBon\src\terminal.jl:1493 [inlined] [11] app(model::Kaimon.KaimonModel; fps::Int64, default_bindings::Bool, on_stdout::Nothing, on_stderr::Nothing, tty_out::Nothing, tty_size::Nothing) @ Tachikoma C:\Users\a1058035\.julia\packages\Tachikoma\vrBon\src\app.jl:1010 [12] invokelatest @ .\Base_compiler.jl:250 [inlined] [13] tui(; port::Int64, theme_name::Nothing, revise_polling::Bool, revise_mod::Nothing) @ Kaimon C:\Users\a1058035\.julia\packages\Kaimon\6N7iB\src\tui\lifecycle.jl:440 [14] main(ARGS::Vector{String}) @ Kaimon C:\Users\a1058035\.julia\packages\Kaimon\6N7iB\src\Kaimon.jl:2657 [15] _start() @ Base .\client.jl:556 ```

BambOoxX commented

2026-06-03 04:56:57 -07:00

(Migrated from github.com)

Same here...

👍 1

BambOoxX commented

2026-06-08 04:23:33 -07:00

(Migrated from github.com)

To be precise, this seems to come from
github.com/kahliburke/Kaimon.jl@30d378d712/src/tui/io.jl (L211)
Which does not make much sense on Windows. In such a context wouldn't a

 _TUI_REAL_STDOUT[] = open(tempname(), "w")

be better ?
Which would generalize to

_TUI_REAL_STDOUT[] = iswindows() ? open(tempname(), "w") : open("/dev/tty", "w")

To be precise, this seems to come from https://github.com/kahliburke/Kaimon.jl/blob/30d378d712f3a79d6f3266043bfae738ec5dd7d2/src/tui/io.jl#L211 Which does not make much sense on Windows. In such a context wouldn't a ```julia _TUI_REAL_STDOUT[] = open(tempname(), "w") ``` be better ? Which would generalize to ```julia _TUI_REAL_STDOUT[] = iswindows() ? open(tempname(), "w") : open("/dev/tty", "w") ```

kahliburke commented

2026-06-08 23:05:23 -07:00

(Migrated from github.com)

Unfortunately I don't use Windows and don't have a good testing environment. I appreciate the bug report and will investigate. But I likely need some assistance in testing any fixes. Of course PRs which have been tested in Windows independently would be appreciated.

cstjean commented

2026-06-08 23:18:25 -07:00

(Migrated from github.com)

I appreciate it! To be transparent, I was eager to try out Kaimon, but now julia-mcp has proven sufficient, so I wouldn't be a good test user at this time. Maybe @BambOoxX ?

I appreciate it! To be transparent, I was eager to try out Kaimon, but now `julia-mcp` has proven sufficient, so I wouldn't be a good test user at this time. Maybe @BambOoxX ?

BambOoxX commented

2026-06-12 10:02:57 -07:00

(Migrated from github.com)

I'm fully discovering this world, so I'm not sure I would be the perfect beta tester, but I can try.
@kahliburke Are there any caveats to dev Kaimon ? I've just followed the steps of the documentation to set it up, but contributing might be trickier.

I'm fully discovering this world, so I'm not sure I would be the perfect beta tester, but I can try. @kahliburke Are there any caveats to `dev` Kaimon ? I've just followed the steps of the documentation to set it up, but contributing might be trickier.

kahliburke commented

2026-06-14 05:41:38 -07:00

(Migrated from github.com)

@BambOoxX not really, it's a standard Julia package and follows the conventions. The only thing a little less common which I've used is the Julia 'app' system which allows installing the script to start the TUI. You can dev the app as well with ]app dev ....

If there's something I can assist with let me know.

@BambOoxX not really, it's a standard Julia package and follows the conventions. The only thing a little less common which I've used is the Julia 'app' system which allows installing the script to start the TUI. You can dev the app as well with `]app dev ...`. If there's something I can assist with let me know.

kahliburke commented

2026-06-14 05:43:04 -07:00

(Migrated from github.com)

@cstjean I've read that recent updates to VSCode have included kitty terminal support, which might be one possible thing to try, if you find the interest. Also, I recommend WSL as this stuff likely works great in that environment too.

👍 1

kahliburke commented

2026-06-19 16:33:40 -07:00

(Migrated from github.com)

Fixed. _start_stdout_capture! now opens CON on Windows instead of /dev/tty (src/tui/io.jl) — that's exactly the call in your stacktrace, so this crash is resolved on 2.0-integration.

Full Windows support has a couple more pieces (the ZMQ ipc://→TCP switch), which are done and tracked in the umbrella issue #41 — that's where Windows verification will continue. Closing this one as the specific /dev/tty crash is fixed. Thanks for the clear report!

Fixed. `_start_stdout_capture!` now opens `CON` on Windows instead of `/dev/tty` (`src/tui/io.jl`) — that's exactly the call in your stacktrace, so this crash is resolved on `2.0-integration`. Full Windows support has a couple more pieces (the ZMQ `ipc://`→TCP switch), which are done and tracked in the umbrella issue #41 — that's where Windows verification will continue. Closing this one as the specific `/dev/tty` crash is fixed. Thanks for the clear report!

👍 1

franckgaga commented

2026-06-25 06:42:27 -07:00

(Migrated from github.com)

Hello!

It seems that the issue is not resolved. I tried to run the app on Windows 11 and it returns this error:

PS C:\Users\francis.gagnon> kaimon
ERROR: SystemError: opening file "/dev/tty": No such file or directory
Stacktrace:
  [1] systemerror(p::String, errno::Int32; extrainfo::Nothing)
    @ Base .\error.jl:186
  [2] open(fname::String; lock::Bool, read::Nothing, write::Nothing, create::Nothing, truncate::Bool, append::Nothing)
    @ Base .\iostream.jl:317
  [3] open
    @ .\iostream.jl:296 [inlined]
  [4] open(fname::String, mode::String; lock::Bool)
    @ Base .\iostream.jl:380
  [5] open
    @ .\iostream.jl:379 [inlined]
  [6] _start_stdout_capture!()
    @ Kaimon C:\Users\francis.gagnon\.julia\packages\Kaimon\6N7iB\src\tui\io.jl:211
  [7] init!(m::Kaimon.KaimonModel, _t::Tachikoma.Terminal)
    @ Kaimon C:\Users\francis.gagnon\.julia\packages\Kaimon\6N7iB\src\tui\lifecycle.jl:212
  [8] (::Tachikoma.var"#229#230"{Int64, Bool, Kaimon.KaimonModel, Base.RefValue{Any}, Base.RefValue{Any}, Base.RefValue{Bool}})(t::Tachikoma.Terminal)
    @ Tachikoma C:\Users\francis.gagnon\.julia\packages\Tachikoma\35crv\src\app.jl:1011
  [9] with_terminal(f::Tachikoma.var"#229#230"{Int64, Bool, Kaimon.KaimonModel, Base.RefValue{Any}, Base.RefValue{Any}, Base.RefValue{Bool}}; tty_out::Nothing, tty_size::Nothing, on_stdout::Nothing, on_stderr::Nothing)
    @ Tachikoma C:\Users\francis.gagnon\.julia\packages\Tachikoma\35crv\src\terminal.jl:1515
 [10] with_terminal
    @ C:\Users\francis.gagnon\.julia\packages\Tachikoma\35crv\src\terminal.jl:1493 [inlined]
 [11] app(model::Kaimon.KaimonModel; fps::Int64, default_bindings::Bool, on_stdout::Nothing, on_stderr::Nothing, tty_out::Nothing, tty_size::Nothing)
    @ Tachikoma C:\Users\francis.gagnon\.julia\packages\Tachikoma\35crv\src\app.jl:1010
 [12] invokelatest
    @ .\Base_compiler.jl:250 [inlined]
 [13] tui(; port::Int64, theme_name::Nothing, revise_polling::Bool, revise_mod::Nothing)
    @ Kaimon C:\Users\francis.gagnon\.julia\packages\Kaimon\6N7iB\src\tui\lifecycle.jl:440
 [14] main(ARGS::Vector{String})
    @ Kaimon C:\Users\francis.gagnon\.julia\packages\Kaimon\6N7iB\src\Kaimon.jl:2657
 [15] _start()
    @ Base .\client.jl:556

Thanks!

Hello! It seems that the issue is not resolved. I tried to run the app on Windows 11 and it returns this error: ``` PS C:\Users\francis.gagnon> kaimon ERROR: SystemError: opening file "/dev/tty": No such file or directory Stacktrace: [1] systemerror(p::String, errno::Int32; extrainfo::Nothing) @ Base .\error.jl:186 [2] open(fname::String; lock::Bool, read::Nothing, write::Nothing, create::Nothing, truncate::Bool, append::Nothing) @ Base .\iostream.jl:317 [3] open @ .\iostream.jl:296 [inlined] [4] open(fname::String, mode::String; lock::Bool) @ Base .\iostream.jl:380 [5] open @ .\iostream.jl:379 [inlined] [6] _start_stdout_capture!() @ Kaimon C:\Users\francis.gagnon\.julia\packages\Kaimon\6N7iB\src\tui\io.jl:211 [7] init!(m::Kaimon.KaimonModel, _t::Tachikoma.Terminal) @ Kaimon C:\Users\francis.gagnon\.julia\packages\Kaimon\6N7iB\src\tui\lifecycle.jl:212 [8] (::Tachikoma.var"#229#230"{Int64, Bool, Kaimon.KaimonModel, Base.RefValue{Any}, Base.RefValue{Any}, Base.RefValue{Bool}})(t::Tachikoma.Terminal) @ Tachikoma C:\Users\francis.gagnon\.julia\packages\Tachikoma\35crv\src\app.jl:1011 [9] with_terminal(f::Tachikoma.var"#229#230"{Int64, Bool, Kaimon.KaimonModel, Base.RefValue{Any}, Base.RefValue{Any}, Base.RefValue{Bool}}; tty_out::Nothing, tty_size::Nothing, on_stdout::Nothing, on_stderr::Nothing) @ Tachikoma C:\Users\francis.gagnon\.julia\packages\Tachikoma\35crv\src\terminal.jl:1515 [10] with_terminal @ C:\Users\francis.gagnon\.julia\packages\Tachikoma\35crv\src\terminal.jl:1493 [inlined] [11] app(model::Kaimon.KaimonModel; fps::Int64, default_bindings::Bool, on_stdout::Nothing, on_stderr::Nothing, tty_out::Nothing, tty_size::Nothing) @ Tachikoma C:\Users\francis.gagnon\.julia\packages\Tachikoma\35crv\src\app.jl:1010 [12] invokelatest @ .\Base_compiler.jl:250 [inlined] [13] tui(; port::Int64, theme_name::Nothing, revise_polling::Bool, revise_mod::Nothing) @ Kaimon C:\Users\francis.gagnon\.julia\packages\Kaimon\6N7iB\src\tui\lifecycle.jl:440 [14] main(ARGS::Vector{String}) @ Kaimon C:\Users\francis.gagnon\.julia\packages\Kaimon\6N7iB\src\Kaimon.jl:2657 [15] _start() @ Base .\client.jl:556 ``` Thanks!

👀 1

kahliburke commented

2026-06-26 11:38:13 -07:00

(Migrated from github.com)

@franckgaga We're working on the 2.0 release, could you take a look at the 2.0-integration branch?

franckgaga commented

2026-06-30 08:35:01 -07:00

(Migrated from github.com)

@kahliburke just tried to install it and it seems there is a conflict in the various Project.toml files:

(@v1.12) pkg> add Kaimon#2.0-integration
    Updating git-repo `https://github.com/kahliburke/Kaimon.jl.git`
   Resolving package versions...
ERROR: Unsatisfiable requirements detected for package KaimonGate [5ee84a8c]:
 KaimonGate [5ee84a8c] log:
 ├─KaimonGate [5ee84a8c] has no known versions!
 └─restricted to versions 0.1 by Kaimon [d3856c55] — no versions left
   └─Kaimon [d3856c55] log:
     ├─possible versions are: 1.3.1 or uninstalled
     └─Kaimon [d3856c55] is fixed to version 1.3.1

@kahliburke just tried to install it and it seems there is a conflict in the various `Project.toml` files: ```julia (@v1.12) pkg> add Kaimon#2.0-integration Updating git-repo `https://github.com/kahliburke/Kaimon.jl.git` Resolving package versions... ERROR: Unsatisfiable requirements detected for package KaimonGate [5ee84a8c]: KaimonGate [5ee84a8c] log: ├─KaimonGate [5ee84a8c] has no known versions! └─restricted to versions 0.1 by Kaimon [d3856c55] — no versions left └─Kaimon [d3856c55] log: ├─possible versions are: 1.3.1 or uninstalled └─Kaimon [d3856c55] is fixed to version 1.3.1 ```

👍 1

kahliburke commented

2026-06-30 10:44:24 -07:00

(Migrated from github.com)

@franckgaga Thanks I'll fix

🚀 1

kahliburke commented

2026-06-30 11:41:02 -07:00

(Migrated from github.com)

While in development mode here, you should use dev instead of add. This is because KaimonGate uses [sources] in the Project.toml to resolve the Kaimon code it's developed against. So, two ways:

Clone the branch, then dev the path:

git clone -b 2.0-integration
https://github.com/kahliburke/Kaimon.jl.git
pkg> dev /path/to/Kaimon.jl

Let dev clone it, then switch branches in the dev dir:

  pkg> dev Kaimon          # clones default branch to ~/.julia/dev/Kaimon
  cd ~/.julia/dev/Kaimon && git checkout 2.0-integration
  pkg> resolve             # re-resolve against the now-checked-out branch

While in development mode here, you should use `dev` instead of `add`. This is because KaimonGate uses [sources] in the Project.toml to resolve the Kaimon code it's developed against. So, two ways: 1. Clone the branch, then dev the path: ``` git clone -b 2.0-integration https://github.com/kahliburke/Kaimon.jl.git pkg> dev /path/to/Kaimon.jl ``` 2. Let dev clone it, then switch branches in the dev dir: ``` pkg> dev Kaimon # clones default branch to ~/.julia/dev/Kaimon cd ~/.julia/dev/Kaimon && git checkout 2.0-integration pkg> resolve # re-resolve against the now-checked-out branch ```

kahliburke commented

2026-06-30 11:41:50 -07:00

(Migrated from github.com)

@franckgaga These are minor pains just pre 2.0 release, it will be streamlined soon. Thanks for your patience in the meantime.

franckgaga commented

2026-06-30 11:57:13 -07:00

(Migrated from github.com)

While in development mode here, you should use dev instead of add. This is because KaimonGate uses [sources] in the Project.toml to resolve the Kaimon code it's developed against. So, two ways:

Clone the branch, then dev the path:
git clone -b 2.0-integration
https://github.com/kahliburke/Kaimon.jl.git
pkg> dev /path/to/Kaimon.jl
Let dev clone it, then switch branches in the dev dir:
  pkg> dev Kaimon          # clones default branch to ~/.julia/dev/Kaimon
  cd ~/.julia/dev/Kaimon && git checkout 2.0-integration
  pkg> resolve             # re-resolve against the now-checked-out branch

Ok I was able to make to install the version of the branch with the second solution. And the ERROR: SystemError: opening file "/dev/tty": No such file or directory issue is solved on this branch. Thanks!

> While in development mode here, you should use `dev` instead of `add`. This is because KaimonGate uses [sources] in the Project.toml to resolve the Kaimon code it's developed against. So, two ways: > > 1. Clone the branch, then dev the path: > > > ``` > git clone -b 2.0-integration > https://github.com/kahliburke/Kaimon.jl.git > pkg> dev /path/to/Kaimon.jl > ``` > > 2. Let dev clone it, then switch branches in the dev dir: > > > ``` > pkg> dev Kaimon # clones default branch to ~/.julia/dev/Kaimon > cd ~/.julia/dev/Kaimon && git checkout 2.0-integration > pkg> resolve # re-resolve against the now-checked-out branch > ``` Ok I was able to make to install the version of the branch with the second solution. And the `ERROR: SystemError: opening file "/dev/tty": No such file or directory` issue is solved on this branch. Thanks!

👍 1

kahliburke commented

2026-06-30 12:24:48 -07:00

(Migrated from github.com)

@franckgaga great, I will close for now, but feel free to open a new issue if you run into any related problems. Also 2.0 should be released in the near future and any feedback you have on that once it lands is appreciated.

🚀 2

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Kaimon crashes on startup on Windows (opening file "/dev/tty") #49