fix(ext/node): implement process.geteuid (#21151)

Fixes #21097

cli/tests/unit_node/process_test.ts

@@ -728,6 +728,14 @@ Deno.test("process.getuid", () => {
   }
 });
 
+Deno.test("process.geteuid", () => {
+  if (Deno.build.os === "windows") {
+    assertEquals(process.geteuid, undefined);
+  } else {
+    assert(typeof process.geteuid?.() === "number");
+  }
+});
+
 Deno.test({
   name: "process.exit",
   async fn() {

ext/node/lib.rs

@@ -248,6 +248,7 @@ deno_core::extension!(deno_node,
     ops::os::op_node_os_get_priority<P>,
     ops::os::op_node_os_set_priority<P>,
     ops::os::op_node_os_username<P>,
+    ops::os::op_geteuid<P>,
     op_node_build_os,
     op_is_any_arraybuffer,
     op_node_is_promise_rejected,

ext/node/ops/os.rs

@@ -52,6 +52,25 @@ where
   Ok(deno_whoami::username())
 }
 
+#[op2(fast)]
+pub fn op_geteuid<P>(state: &mut OpState) -> Result<u32, AnyError>
+where
+  P: NodePermissions + 'static,
+{
+  {
+    let permissions = state.borrow_mut::<P>();
+    permissions.check_sys("geteuid", "node:os.geteuid()")?;
+  }
+
+  #[cfg(windows)]
+  let euid = 0;
+  #[cfg(unix)]
+  // SAFETY: Call to libc geteuid.
+  let euid = unsafe { libc::geteuid() };
+
+  Ok(euid)
+}
+
 #[cfg(unix)]
 mod priority {
   use super::*;

ext/node/polyfills/process.ts

@@ -6,6 +6,7 @@
 
 const internals = globalThis.__bootstrap.internals;
 const { core } = globalThis.__bootstrap;
+const { ops } = core;
 import { notImplemented, warnNotImplemented } from "ext:deno_node/_utils.ts";
 import { EventEmitter } from "node:events";
 import Module from "node:module";
@@ -652,6 +653,11 @@ class Process extends EventEmitter {
     return Deno.uid()!;
   }
 
+  /** This method is removed on Windows */
+  geteuid?(): number {
+    return ops.op_geteuid();
+  }
+
   // TODO(kt3k): Implement this when we added -e option to node compat mode
   _eval: string | undefined = undefined;
 
@@ -693,6 +699,7 @@ class Process extends EventEmitter {
 if (isWindows) {
   delete Process.prototype.getgid;
   delete Process.prototype.getuid;
+  delete Process.prototype.geteuid;
 }
 
 /** https://nodejs.org/api/process.html#process_process */