fix: android support (#19437)

<!--
Before submitting a PR, please read https://deno.com/manual/contributing

1. Give the PR a descriptive title.

  Examples of good title:
    - fix(std/http): Fix race condition in server
    - docs(console): Update docstrings
    - feat(doc): Handle nested reexports

  Examples of bad title:
    - fix #7123
    - update docs
    - fix bugs

2. Ensure there is a related issue and it is referenced in the PR text.
3. Ensure there are tests that cover the changes.
4. Ensure `cargo test` passes.
5. Ensure `./tools/format.js` passes without changing files.
6. Ensure `./tools/lint.js` passes.
7. Open as a draft PR if your work is still in progress. The CI won't
run
   all steps, but you can add '[ci]' to a commit message to force it to.
8. If you would like to run the benchmarks on the CI, add the 'ci-bench'
label.
-->

---------

Signed-off-by: Matt Mastracci <matthew@mastracci.com>
Co-authored-by: Matt Mastracci <matthew@mastracci.com>

5 files changed, 17 insertions, 5 deletions

diff --git a/ext/node/ops/os/cpus.rs b/ext/node/ops/os/cpus.rs
index 5db929961..6c852dce7 100644
--- a/ext/node/ops/os/cpus.rs
+++ b/ext/node/ops/os/cpus.rs
@@ -236,7 +236,7 @@ pub fn cpu_info() -> Option<Vec<CpuInfo>> {
   }
 }
 
-#[cfg(target_os = "linux")]
+#[cfg(any(target_os = "android", target_os = "linux"))]
 pub fn cpu_info() -> Option<Vec<CpuInfo>> {
   use std::io::BufRead;
 
diff --git a/ext/node/polyfills/_util/os.ts b/ext/node/polyfills/_util/os.ts
index 2c01d5c6e..239419d91 100644
--- a/ext/node/polyfills/_util/os.ts
+++ b/ext/node/polyfills/_util/os.ts
@@ -3,9 +3,15 @@
 import { core } from "ext:core/mod.js";
 const ops = core.ops;
 
-export type OSType = "windows" | "linux" | "darwin" | "freebsd" | "openbsd";
+export type OSType =
+  | "windows"
+  | "linux"
+  | "android"
+  | "darwin"
+  | "freebsd"
+  | "openbsd";
 
 export const osType: OSType = ops.op_node_build_os();
 
 export const isWindows = osType === "windows";
-export const isLinux = osType === "linux";
+export const isLinux = osType === "linux" || osType === "android";
diff --git a/ext/node/polyfills/internal_binding/constants.ts b/ext/node/polyfills/internal_binding/constants.ts
index cb66ac5bd..69a2dffeb 100644
--- a/ext/node/polyfills/internal_binding/constants.ts
+++ b/ext/node/polyfills/internal_binding/constants.ts
@@ -330,7 +330,7 @@ if (buildOs === "darwin") {
       PRIORITY_HIGHEST: -20,
     },
   };
-} else if (buildOs === "linux") {
+} else if (buildOs === "linux" || buildOs === "android") {
   os = {
     UV_UDP_REUSEADDR: 4,
     dlopen: {
diff --git a/ext/node/polyfills/internal_binding/uv.ts b/ext/node/polyfills/internal_binding/uv.ts
index 08315b094..aa468a0a5 100644
--- a/ext/node/polyfills/internal_binding/uv.ts
+++ b/ext/node/polyfills/internal_binding/uv.ts
@@ -494,6 +494,8 @@ export const errorMap = new Map<number, [string, string]>(
     ? codeToErrorDarwin
     : osType === "linux"
     ? codeToErrorLinux
+    : osType === "android"
+    ? codeToErrorLinux
     : osType === "freebsd"
     ? codeToErrorFreebsd
     : osType === "openbsd"
@@ -508,6 +510,8 @@ export const codeMap = new Map<string, number>(
     ? errorToCodeDarwin
     : osType === "linux"
     ? errorToCodeLinux
+    : osType === "android"
+    ? errorToCodeLinux
     : osType === "freebsd"
     ? errorToCodeFreebsd
     : osType === "openbsd"
diff --git a/ext/node/polyfills/os.ts b/ext/node/polyfills/os.ts
index af3e69d64..5d354b38b 100644
--- a/ext/node/polyfills/os.ts
+++ b/ext/node/polyfills/os.ts
@@ -151,7 +151,7 @@ export function endianness(): "BE" | "LE" {
 
 /** Return free memory amount */
 export function freemem(): number {
-  if (Deno.build.os === "linux") {
+  if (Deno.build.os === "linux" || Deno.build.os == "android") {
     // On linux, use 'available' memory
     // https://github.com/libuv/libuv/blob/a5c01d4de3695e9d9da34cfd643b5ff0ba582ea7/src/unix/linux.c#L2064
     return Deno.systemMemoryInfo().available;
@@ -176,6 +176,7 @@ export function homedir(): string | null {
     case "windows":
       return Deno.env.get("USERPROFILE") || null;
     case "linux":
+    case "android":
     case "darwin":
     case "freebsd":
     case "openbsd":
@@ -310,6 +311,7 @@ export function type(): string {
     case "windows":
       return "Windows_NT";
     case "linux":
+    case "android":
       return "Linux";
     case "darwin":
       return "Darwin";