import { spawn, type ChildProcess } from 'node:child_process';
import { type CgroupOomSnapshot } from './oxigraph-memory.js';
export declare const OXIGRAPH_WATCHDOG_OOM_MARKER = "[oxigraph-watchdog] scoped child OOM-killed by cgroup memory cap (or host OOM)";
export interface OxigraphParentWatchdogOptions {
    parentPid: number;
    command: string;
    args: readonly string[];
    pollIntervalMs?: number;
    spawnChild?: typeof spawn;
    isProcessAlive?: (pid: number) => boolean;
    readOomSnapshot?: (pid: number) => CgroupOomSnapshot | null;
    readOomKill?: (dir: string) => number | null;
}
export interface OxigraphParentWatchdogResult {
    code: number | null;
    signal: NodeJS.Signals | null;
    parentLost: boolean;
    oomKilled: boolean;
}
export interface OxigraphParentWatchdogHandle {
    child: ChildProcess;
    result: Promise<OxigraphParentWatchdogResult>;
    stop(signal?: NodeJS.Signals): void;
}
/**
 * Keep Oxigraph tied to the DKG daemon even though systemd places it in a
 * sibling cgroup. The typed watchdog forwards shutdown signals and terminates
 * Oxigraph within one poll interval if the original daemon PID disappears.
 */
export declare function startOxigraphParentWatchdog(opts: OxigraphParentWatchdogOptions): OxigraphParentWatchdogHandle;
export declare function parseOxigraphParentWatchdogArgs(argv: readonly string[]): {
    parentPid: number;
    command: string;
    args: string[];
};
export declare function conventionalSignalExitCode(signal: NodeJS.Signals): number;
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