From 48e94b2e386641044989ef2dfe98b0d30ae09b20 Mon Sep 17 00:00:00 2001
From: Rahulstark2 <rahulstark2@gmail.com>
Date: Sat, 3 Oct 2026 22:47:44 +0530
Subject: [PATCH] fix(sdk): preserve child exit status over EPIPE

---
 packages/sdk/src/named-gate-lowering.ts           |  5 ++++-
 packages/sdk/tests/named-gate-diagnostics.test.ts | 15 +++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/packages/sdk/src/named-gate-lowering.ts b/packages/sdk/src/named-gate-lowering.ts
index 8a4ac5039..ed7f6f39b 100644
--- a/packages/sdk/src/named-gate-lowering.ts
+++ b/packages/sdk/src/named-gate-lowering.ts
@@ -128,9 +128,12 @@ process.exit(result.status===0?0:1);`;
       body = `const result=cp.spawnSync('wc',['-w'],{input:text,encoding:'utf8',env:{...process.env,LC_ALL:'C'}});
 const noise=(result.stderr||'').trim().slice(-200);
 const said=noise===''?'':': '+noise;
-if(result.error)fail('could not run wc -w: '+(result.error.code||result.error.message)+said);
 if(result.signal)fail('wc -w was terminated by '+result.signal+said);
+if(result.status!==null){
 if(result.status!==0)fail('wc -w exited '+result.status+said);
+}else if(result.error){
+fail('could not run wc -w: '+(result.error.code||result.error.message)+said);
+}
 const count=result.stdout.trim();
 if(!/^[0-9]+$/.test(count))fail('wc -w printed '+JSON.stringify(count.slice(0,80))+' instead of a word count'+said);
 process.stdout.write(BigInt(count).toString());`;
diff --git a/packages/sdk/tests/named-gate-diagnostics.test.ts b/packages/sdk/tests/named-gate-diagnostics.test.ts
index b35c60eb2..48edc5ceb 100644
--- a/packages/sdk/tests/named-gate-diagnostics.test.ts
+++ b/packages/sdk/tests/named-gate-diagnostics.test.ts
@@ -279,4 +279,19 @@ describe('word_count_bounds reports why its own child failed', () => {
     expect(capture.status).toBe(1);
     expect(capture.stderr).toContain('SIGKILL');
   });
+
+  it('does not report EPIPE when wc exits nonzero after closing stdin', () => {
+    const path = stubWordCount('exit 2');
+    const largeInput = 'x'.repeat(100_000);
+
+    const capture = runGate(
+      command(),
+      { output: deterministicEnvelope(largeInput) },
+      { path },
+    );
+
+    expect(capture.status).toBe(1);
+    expect(capture.stderr).toContain('exited 2');
+    expect(capture.stderr).not.toContain('EPIPE');
+  });
 });