uds: illumos can build using existing Solaris support

[jclulow]

First, let me begin by saying I understand that the v0.1 series of tokio is deprecated. Unfortunately it's still seeing somewhat wide usage in the ecosystem, including in RLS in the official Rust toolchain:

$ cargo tree -i -p tokio-uds 
tokio-uds v0.2.6
├── parity-tokio-ipc v0.2.0
│   ├── jsonrpc-client-transports v14.0.5
│   │   └── jsonrpc-core-client v14.0.5
│   │       └── rls-ipc v0.1.0 (/ws/crossrust/work/rust/src/tools/rls/rls-ipc)
│   │           ├── rls v1.41.0 (/ws/crossrust/work/rust/src/tools/rls)
│   │           └── rls-rustc v0.6.0 (/ws/crossrust/work/rust/src/tools/rls/rls-rustc)
│   │               └── rls v1.41.0 (/ws/crossrust/work/rust/src/tools/rls) (*)
│   └── jsonrpc-ipc-server v14.0.3
│       └── rls-ipc v0.1.0 (/ws/crossrust/work/rust/src/tools/rls/rls-ipc) (*)
└── tokio v0.1.22
    ├── jsonrpc-client-transports v14.0.5 (*)
    ├── jsonrpc-server-utils v14.0.5
    │   ├── jsonrpc-client-transports v14.0.5 (*)
    │   └── jsonrpc-ipc-server v14.0.3 (*)
    ├── parity-tokio-ipc v0.2.0 (*)
    ├── rls v1.41.0 (/ws/crossrust/work/rust/src/tools/rls) (*)
    ├── rls-rustc v0.6.0 (/ws/crossrust/work/rust/src/tools/rls/rls-rustc) (*)
    └── tokio-named-pipes v0.1.0
        └── parity-tokio-ipc v0.2.0 (*)
    [dev-dependencies]
    └── rls v1.41.0 (/ws/crossrust/work/rust/src/tools/rls) (*)

I'd like to make this small change to allow us to build RLS on illumos, now that support for our host triple is in the compiler (see rust-lang/rust#71145 and rust-lang/rust#55553) and we're on the path to being in the official CI/CD system (see rust-lang/rust#71272 and rust-lang/compiler-team#279). The existing support in tokio-uds here for Solaris systems is sufficient also for illumos, we just need to fix the conditional compilation directives and get a v0.2.7 of tokio-uds out the door.

I've run the test suite for tokio-uds on a current illumos system and it appears to work.

Thanks!

[jclulow]

I'm not sure what's up with the FreeBSD CI failure, but it doesn't look related to this change:

pkg install -y curl
Updating FreeBSD repository catalogue...
Fetching meta.txz: . done
pkg: repository meta /var/db/pkg/FreeBSD.meta has wrong version 2
repository FreeBSD has no meta file, using default settings
Fetching packagesite.txz: .......... done
pkg: repository meta /var/db/pkg/FreeBSD.meta has wrong version 2
pkg: Repository FreeBSD load error: meta cannot be loaded No error: 0
Unable to open created repository FreeBSD
Unable to update repository FreeBSD
Error updating repositories!

Exit status: 3

[Darksonn]

I apologize for the delay; we are currently a bit low on manpower. The FreeBSD issue can be fixed by applying the same change as in #2403.

[taiki-e]

Could you merge v0.1.x branch for CI fixes?

[jclulow]

@taiki-e Done! I rebased on the CI fix there.

[jclulow]

Hi! What can I do to help this along? Thanks.

[jclulow]

Thank you!