Add support for querying dom-node map

src/numa.rs

@@ -222,3 +222,13 @@ pub fn get_numa_distance_info(token: &mut CleanLockToken) -> Result<Vec<u8>> {
         .map(|e| *e)
         .collect())
 }
+
+pub fn get_numa_dom_info(token: &mut CleanLockToken) -> Result<Vec<u8>> {
+    Ok(DOMAIN_NODE_MAP
+        .get()
+        .ok_or(Error::new(EOPNOTSUPP))?
+        .iter()
+        .map(|e| e.to_ne_bytes())
+        .flatten()
+        .collect())
+}

src/scheme/sys/mod.rs

@@ -78,6 +78,7 @@ const FILES: &[(&str, Kind)] = &[
     ("log", Rd(log::resource)),
     ("numa", Rd(crate::numa::get_numa_info)),
     ("numa_dist", Rd(crate::numa::get_numa_distance_info)),
+    ("numa_dom", Rd(crate::numa::get_numa_dom_info)),
     ("syscall", Rd(syscall::resource)),
     ("uname", Rd(uname::resource)),
     ("env", Rd(|_| Ok(Vec::from(crate::startup::init_env())))),