turns out Solarish targets support our entire test suite

README.md

@@ -217,7 +217,7 @@ degree documented below):
 - For every other target with OS `linux`, `macos`, or `windows`, Miri should generally work, but we
   make no promises and we don't run tests for such targets.
 - We have unofficial support (not maintained by the Miri team itself) for some further operating systems.
-  - `solaris` / `illumos`: maintained by @devnexen. Supports `std::{env, thread, sync}`, but not `std::fs`.
+  - `solaris` / `illumos`: maintained by @devnexen. Supports the entire test suite.
   - `freebsd`: maintained by @YohDeadfall. Supports `std::env` and parts of `std::{thread, fs}`, but not `std::sync`.
   - `android`: **maintainer wanted**. Support very incomplete, but a basic "hello world" works.
   - `wasi`: **maintainer wanted**. Support very incomplete, not even standard output works, but an empty `main` function works.

ci/ci.sh

@@ -147,13 +147,14 @@ case $HOST_TARGET in
     # Extra tier 2
     TEST_TARGET=arm-unknown-linux-gnueabi run_tests
     TEST_TARGET=s390x-unknown-linux-gnu run_tests # big-endian architecture of choice
+    # Not officially supported tier 2
+    TEST_TARGET=x86_64-unknown-illumos run_tests
+    TEST_TARGET=x86_64-pc-solaris run_tests
     # Partially supported targets (tier 2)
     BASIC="empty_main integer heap_alloc libc-mem vec string btreemap" # ensures we have the basics: pre-main code, system allocator
     UNIX="hello panic/panic panic/unwind concurrency/simple atomic libc-mem libc-misc libc-random env num_cpus" # the things that are very similar across all Unixes, and hence easily supported there
     TEST_TARGET=x86_64-unknown-freebsd run_tests_minimal $BASIC $UNIX time hashmap random threadname pthread fs libc-pipe
     TEST_TARGET=i686-unknown-freebsd   run_tests_minimal $BASIC $UNIX time hashmap random threadname pthread fs libc-pipe
-    TEST_TARGET=x86_64-unknown-illumos run_tests_minimal $BASIC $UNIX time hashmap random thread sync available-parallelism tls libc-pipe fs
-    TEST_TARGET=x86_64-pc-solaris      run_tests_minimal $BASIC $UNIX time hashmap random thread sync available-parallelism tls libc-pipe fs
     TEST_TARGET=aarch64-linux-android  run_tests_minimal $BASIC $UNIX time hashmap random sync threadname pthread epoll eventfd
     TEST_TARGET=wasm32-wasip2          run_tests_minimal $BASIC wasm
     TEST_TARGET=wasm32-unknown-unknown run_tests_minimal no_std empty_main wasm # this target doesn't really have std

src/shims/unix/solarish/foreign_items.rs

@@ -78,6 +78,14 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 this.write_scalar(result, dest)?;
             }
 
+            // Sockets and pipes
+            "__xnet_socketpair" => {
+                let [domain, type_, protocol, sv] =
+                    this.check_shim(abi, Conv::C, link_name, args)?;
+                let result = this.socketpair(domain, type_, protocol, sv)?;
+                this.write_scalar(result, dest)?;
+            }
+
             // Miscellaneous
             "___errno" => {
                 let [] = this.check_shim(abi, Conv::C, link_name, args)?;

tests/fail-dep/libc/affinity.rs

@@ -1,5 +1,4 @@
-//@ignore-target: windows # only very limited libc on Windows
-//@ignore-target: apple # `sched_setaffinity` is not supported on macOS
+//@only-target: linux # these are Linux-specific APIs
 //@compile-flags: -Zmiri-disable-isolation -Zmiri-num-cpus=4
 
 fn main() {

tests/fail-dep/libc/memrchr_null.rs

@@ -1,9 +1,8 @@
-//@ignore-target: windows # No `memrchr` on Windows
-//@ignore-target: apple # No `memrchr` on some apple targets
+//@only-target: linux # `memrchr` is a GNU extension
 
 use std::ptr;
 
-// null is explicitly called out as UB in the C docs.
+// null is explicitly called out as UB in the C docs for `memchr`.
 fn main() {
     unsafe {
         libc::memrchr(ptr::null(), 0, 0); //~ERROR: null pointer

tests/pass-dep/libc/libc-affinity.rs

@@ -1,5 +1,4 @@
-//@ignore-target: windows # only very limited libc on Windows
-//@ignore-target: apple # `sched_{g, s}etaffinity` are not supported on macOS
+//@only-target: linux # these are Linux-specific APIs
 //@compile-flags: -Zmiri-disable-isolation -Zmiri-num-cpus=4
 #![feature(io_error_more)]
 #![feature(pointer_is_aligned_to)]