On Linux, respect memory limit from cgroups (#5849)

* Implement `process.constrainedMemory()`

* Add a comment

* Handle max

* Missing header

* We can use WTF::ramSize now

* Update WebKit

* Update ZigGlobalObject.cpp

* WebKit

* :scissors:

---------

Co-authored-by: Jarred Sumner <709451+Jarred-Sumner@users.noreply.github.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/test/js/node/process/process.test.js b/test/js/node/process/process.test.js
index dc1081087..a4a8862a2 100644
--- a/test/js/node/process/process.test.js
+++ b/test/js/node/process/process.test.js
@@ -487,3 +487,13 @@ it("dlopen args parsing", () => {
   expect(() => process.dlopen({ module: { exports: Symbol("123") } }, "/tmp/not-found.so")).toThrow();
   expect(() => process.dlopen({ module: { exports: Symbol("123") } }, Symbol("badddd"))).toThrow();
 });
+
+it("process.constrainedMemory()", () => {
+  if (process.platform === "linux") {
+    // On Linux, it returns 0 if the kernel doesn't support it
+    expect(process.constrainedMemory() >= 0).toBe(true);
+  } else {
+    // On unsupported platforms, it returns undefined
+    expect(process.constrainedMemory()).toBeUndefined();
+  }
+});