6eaf2baa57
kill(pid, 0) succeeds for zombie processes, causing the gateway lock to treat a zombie lock owner as alive. Read /proc/<pid>/status on Linux to check for 'Z' (zombie) state before reporting the process as alive. This prevents the lock from being held indefinitely by a zombie process during gateway restart. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
34 lines
758 B
TypeScript
34 lines
758 B
TypeScript
import fsSync from "node:fs";
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/**
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* Check if a process is a zombie on Linux by reading /proc/<pid>/status.
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* Returns false on non-Linux platforms or if the proc file can't be read.
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*/
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function isZombieProcess(pid: number): boolean {
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if (process.platform !== "linux") {
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return false;
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}
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try {
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const status = fsSync.readFileSync(`/proc/${pid}/status`, "utf8");
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const stateMatch = status.match(/^State:\s+(\S)/m);
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return stateMatch?.[1] === "Z";
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} catch {
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return false;
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}
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}
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export function isPidAlive(pid: number): boolean {
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if (!Number.isFinite(pid) || pid <= 0) {
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return false;
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}
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try {
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process.kill(pid, 0);
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} catch {
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return false;
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}
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if (isZombieProcess(pid)) {
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return false;
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}
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return true;
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}
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