[Bug 259319] openpty(3) and forkpty(3) don't work under Linux compat

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259319

            Bug ID: 259319
           Summary: openpty(3) and forkpty(3) don't work under Linux
                    compat
           Product: Base System
           Version: 13.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: jmmv@FreeBSD.org

Created attachment 228888
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=228888&action=edit
Small repro program that uses openpty

Linux binaries that call into openpty(3) or forkpty(3) get "No such file or
directory" as a result of these calls. This is in combination with
linux_base-c7-7.9.2009.

I've found this issue while trying to run the VSCode remote server under Linux
compat, but I have attached a trivial repro program that shows the issue.

I have loaded the pty kernel module.

One thing I've found is that these calls are trying to open /dev/ptmx, whereas
this device is under /dev/pts/ptmx on Linux. However, by looking at the glibc
sources, it seems as if the lack of ptmx is a non-fatal error, as the code then
falls back to opening /dev/ptyp0.

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