{"record":{"id":"d2451d26099e4495","repo":"pranshuparmar/witr","slug":"no-service-label-found-for-pid-d","errorCode":null,"errorMessage":"no service label found for pid %d","messagePattern":"no service label found for pid (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"warning","filePath":"internal/launchd/plist.go","lineNumber":72,"sourceCode":"\t\"/Library/LaunchDaemons\",\n\t\"/System/Library/LaunchAgents\",\n\t\"/System/Library/LaunchDaemons\",\n}\n\n// GetServiceLabel uses launchctl blame to get the service label for a PID\nfunc GetServiceLabel(pid int) (string, string, error) {\n\t// launchctl blame <pid> returns the service that started the process\n\tout, err := exec.Command(\"launchctl\", \"blame\", strconv.Itoa(pid)).Output()\n\tif err != nil {\n\t\treturn \"\", \"\", fmt.Errorf(\"launchctl blame failed: %w\", err)\n\t}\n\n\t// Output format varies:\n\t// - \"system/com.apple.example\" or \"gui/501/com.example.app\" (real service)\n\t// - \"speculative\", \"non-ipc demand\", \"launch job demand\", \"ipc (mach)\" (blame reasons)\n\tline := strings.TrimSpace(string(out))\n\tif line == \"\" {\n\t\treturn \"\", \"\", fmt.Errorf(\"no service label found for pid %d\", pid)\n\t}\n\n\t// Check if this is a real service path (contains \"/\" and starts with domain)\n\tif !strings.Contains(line, \"/\") {\n\t\t// This is a blame reason, not a service label\n\t\t// Try to find the service by querying launchctl list\n\t\tlabel, domain := findServiceByPID(pid)\n\t\tif label != \"\" {\n\t\t\treturn label, domain, nil\n\t\t}\n\t\treturn \"\", \"\", fmt.Errorf(\"process not managed by a named launchd service: %s\", line)\n\t}\n\n\t// Parse domain and label from service path\n\tparts := strings.SplitN(line, \"/\", 2)\n\tif len(parts) < 2 {\n\t\treturn line, \"\", nil\n\t}","sourceCodeStart":54,"sourceCodeEnd":90,"githubUrl":"https://github.com/pranshuparmar/witr/blob/dc4fa1da82d3e266fcbd928641b4f30b3077c64f/internal/launchd/plist.go#L54-L90","documentation":"After `launchctl blame <pid>` succeeds, GetServiceLabel trims the output; if the output is empty there is no service label to parse, so it fails with this error. An empty blame output means launchd has no recorded attribution for that pid.","triggerScenarios":"Calling GetServiceLabel for a pid whose blame output is empty: the process was not started by launchd (e.g. started from a shell/IDE), the pid just exited, or blame returned nothing for an unmanaged/system-transient process.","commonSituations":"Inspecting a dev server started manually in a terminal; processes spawned by sshd sessions; querying a pid that died between listing and blame; launchd sessions (gui/system) where blame yields no data for the calling user.","solutions":["Accept that the process is not launchd-managed; skip launchd enrichment and rely on plain process info.","Verify the pid is still alive and re-run — a race with process exit empties output.","Run as the same user (or root) as the target so blame can see its launchd session.","Use the library's findServiceByPID/launchctl list fallback path or your own `launchctl list` scan as an alternative."],"exampleFix":"// before\nlabel, _, err := launchd.GetServiceLabel(pid)\nif err != nil { log.Fatal(err) }\n// after\nlabel, _, err := launchd.GetServiceLabel(pid)\nif err != nil {\n    log.Printf(\"no launchd label for %d (likely not launchd-managed): %v\", pid, err)\n    label = \"\"\n}","handlingStrategy":"fallback","validationCode":"out, err := exec.Command(\"launchctl\", \"blame\", strconv.Itoa(pid)).Output()\nif err == nil && len(strings.TrimSpace(string(out))) == 0 {\n    // blame will yield nothing; skip launchd enrichment up front\n    return nil, nil\n}","typeGuard":null,"tryCatchPattern":"label, domain, err := launchd.GetServiceLabel(pid)\nif err != nil && strings.Contains(err.Error(), \"no service label found\") {\n    log.Printf(\"pid %d is not launchd-managed; continuing without service info\", pid)\n    return defaultProcessInfo(pid)\n}\nif err != nil { return err }","preventionTips":["Only expect labels for genuinely launchd-spawned processes; shell/IDE-launched apps have none.","Treat this as informational (warning) rather than fatal in inspection tools.","Run in the same user session as the target for reliable blame output.","Re-check pid liveness — dying processes produce empty output."],"tags":["macos","launchd","empty-output","process-inspection"],"backgroundTag":"launchd-empty-blame-output","analyzedSha":"dc4fa1da82d3e266fcbd928641b4f30b3077c64f","analyzedAt":"2026-09-01T12:17:08.767Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-08T15:18:49.778Z"}