Re: ncurses 6.6 regression: setupterm() rejects valid PTY, breaks tmux attach

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Please excuse the bullshit, we are having an ncurses episode.


So which Single Unix Specification is at fault, and which email list should
we include in this discussion?  I can add myself as
[email protected], but that's just an alias for this email, and I
have never worked on the Single Unix Specification myself.



Johann

 I'm not from the internet, I just work there.

On Wed, May 27, 2026, 5:03=E2=80=AFPM Liam Huang <[email protected]> wrote:

> Hi Johann,
>
> Just a quick clarification =E2=80=94 the imsg library I'm referring to is=
 the
> OpenBSD IPC library (imsg_init, imsg_compose, etc.), not the macOS
> iMessage CLI tool at github.com/openclaw/imsg. They share a name but
> are completely unrelated projects.
>
> The OpenBSD imsg library provides structured message passing over Unix
> domain sockets, and is used by many OpenBSD daemons (OpenSMTPD,
> OpenBGPD, etc.). tmux bundles a compat copy of it in its source tree
> (compat/imsg.c, compat/imsg-buffer.c) so it can build on non-OpenBSD
> systems like Linux and macOS.
>
> This is not a Linux-vs-SUS issue. It's simply that tmux upgraded its
> bundled copy of this library between releases 3.5a and 3.6b, and the
> new version changed the wire format in a way that's incompatible with
> the old one. When an old server and new client try to communicate, the
> fd-passing mechanism breaks.
>
> Best,
> Liam
>
>
> 2026=E5=B9=B45=E6=9C=8827=E6=97=A5 16:59=EF=BC=8CJohann 'Myrkraverk' Oska=
rsson <[email protected]> =E5=86=99=E9=81=93=EF=BC=9A
>
> Johann
>
>
>

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<div dir=3D"auto"><div>Please excuse the bullshit, we are having an ncurses=
 episode.</div><div dir=3D"auto"><br></div><div dir=3D"auto"><br></div><div=
 dir=3D"auto">So which Single Unix Specification is at fault, and which ema=
il list should we include in this discussion?=C2=A0 I can add myself as <a =
href=3D"mailto:[email protected]">[email protected]</a>, bu=
t that&#39;s just an alias for this email, and I have never worked on the S=
ingle Unix Specification myself.</div><div dir=3D"auto"><br></div><div dir=
=3D"auto"><br></div><div><br></div><div data-smartmail=3D"gmail_signature">=
Johann<br><br> =C2=A0I&#39;m not from the internet, I just work there.</div=
></div><br><div class=3D"gmail_quote gmail_quote_container"><div dir=3D"ltr=
" class=3D"gmail_attr">On Wed, May 27, 2026, 5:03=E2=80=AFPM Liam Huang &lt=
;<a href=3D"mailto:[email protected]">[email protected]</a>&gt; wrote:<br></div><blockq=
uote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc =
solid;padding-left:1ex"><div style=3D"line-break:after-white-space"><div>Hi=
 Johann,</div><div><br></div><div>Just a quick clarification =E2=80=94 the =
imsg library I&#39;m referring to is the</div><div>OpenBSD IPC library (ims=
g_init, imsg_compose, etc.), not the macOS</div><div>iMessage CLI tool at <=
a href=3D"http://github.com/openclaw/imsg" target=3D"_blank" rel=3D"norefer=
rer">github.com/openclaw/imsg</a>. They share a name but</div><div>are comp=
letely unrelated projects.</div><div><br></div><div>The OpenBSD imsg librar=
y provides structured message passing over Unix</div><div>domain sockets, a=
nd is used by many OpenBSD daemons (OpenSMTPD,</div><div>OpenBGPD, etc.). t=
mux bundles a compat copy of it in its source tree</div><div>(compat/imsg.c=
, compat/imsg-buffer.c) so it can build on non-OpenBSD</div><div>systems li=
ke Linux and macOS.</div><div><br></div><div>This is not a Linux-vs-SUS iss=
ue. It&#39;s simply that tmux upgraded its</div><div>bundled copy of this l=
ibrary between releases 3.5a and 3.6b, and the</div><div>new version change=
d the wire format in a way that&#39;s incompatible with</div><div>the old o=
ne. When an old server and new client try to communicate, the</div><div>fd-=
passing mechanism breaks.</div><div><br></div><div>Best,</div><div>Liam</di=
v><div><br></div><div><br><blockquote type=3D"cite"><div>2026=E5=B9=B45=E6=
=9C=8827=E6=97=A5 16:59=EF=BC=8CJohann &#39;Myrkraverk&#39; Oskarsson &lt;<=
a href=3D"mailto:[email protected]" target=3D"_blank" rel=3D"noreferrer=
">[email protected]</a>&gt; =E5=86=99=E9=81=93=EF=BC=9A</div><br><div><=
span style=3D"font-family:Helvetica;font-size:12px;font-style:normal;font-v=
ariant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;t=
ext-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text=
-decoration:none;float:none;display:inline!important">Johann</span></div></=
blockquote></div><br></div></blockquote></div>

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