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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"child_process.exitCode is null after process exited","articleBody":"### Version\n\nv22.14.0\n\n### Platform\n\n```text\nDarwin 23.3.0 Darwin Kernel Version 23.3.0: Wed Dec 20 21:31:10 PST 2023; root:xnu-10002.81.5~7/RELEASE_ARM64_T6031 arm64\n```\n\n### Subsystem\n\nchild_process\n\n### What steps will reproduce the bug?\n\n```\nlet cp = require(\"child_process\")\n\nnew Promise(async () =\u003e {\n        let proc = cp.spawn(\"node\")\n        proc.on(\"close\", () =\u003e { console.log(\"CLOSE\") })\n        proc.on(\"exit\", () =\u003e { console.log(\"EXIT\") })\n        await new Promise((resolve) =\u003e { setTimeout(resolve, 1000) })\n\n        console.log(\"before kill\", proc.killed, proc.signalCode, proc.exitCode)\n        proc.kill(\"SIGKILL\")\n        console.log(\"after kill\", proc.killed, proc.signalCode, proc.exitCode)\n        await new Promise((resolve) =\u003e { setTimeout(resolve, 1000) })\n        console.log(\"after wait\", proc.killed, proc.signalCode, proc.exitCode)\n})\n```\nprints:\n```\nbefore kill false null null\nafter kill true null null\nEXIT\nCLOSE\nafter wait true SIGKILL null\n```\n\n### How often does it reproduce? Is there a required condition?\n\nalways, with these versions on this system\n       v14.16.1\n       v20.18.0\n       v22.14.0\n      v25.0.0\n\nand with v22.18.0 on Linux 6.1.151-cip46-arm64 SMP Tue Oct 14 14:45:25 UTC 2025 aarch64 GNU/Linux\n\n### What is the expected behavior? Why is that the expected behavior?\n\nThe [documentation](https://nodejs.org/docs/latest-v22.x/api/child_process.html#subprocessexitcode) states:\n\u003e The subprocess.exitCode property indicates the exit code of the child process. If the child process is still running, the field will be null.\n\n\n\n### What do you see instead?\n\n`proc.exitCode` is always `null` even after the process has exited/closed\n\n### Additional information\n\nMaybe an error in the documentation?","author":{"url":"https://github.com/giuliomoro","@type":"Person","name":"giuliomoro"},"datePublished":"2025-10-16T20:42:55.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/60285/node/issues/60285"}