/**
 * Generic OS/filesystem utilities shared across Dreamux providers and host,
 * vendored into this leaf package so the provider packages depend on
 * `@excitedjs/dreamux-types` (+ this package) only and never import
 * `@excitedjs/dreamux` core. These are platform primitives (process-group
 * signalling, owner-only dir enforcement, empty-log cleanup, existence probe),
 * NOT Dreamux host layout/path/socket/log contracts — those are supplied by the
 * host through the create context and provider options.
 */
/** True when `pid` names a live process (EPERM counts as alive). */
export declare function isProcessAlive(pid: number): boolean;
/** True when a detached process group still exists (EPERM counts as alive). */
export declare function isProcessGroupAlive(pgid: number): boolean;
/** Signal an entire process group; only an already-absent group is ignored. */
export declare function killProcessGroup(pgid: number, signal: NodeJS.Signals | number): void;
export interface EnsureOwnerOnlyDirOptions {
    /** Current-user uid probe override (tests). */
    getuid?: () => number;
}
/**
 * Create/adopt a directory and guarantee the owner-only (0700) privacy
 * invariant regardless of who created it: reject a symlink leaf, fail loud on a
 * foreign-uid dir, and tighten any group/other permission bits.
 */
export declare function ensureOwnerOnlyDir(path: string, options?: EnsureOwnerOnlyDirOptions): Promise<void>;
/**
 * Remove `path` only if it exists and is zero bytes. Best-effort: a missing,
 * non-empty, or busy file is left untouched and never throws.
 */
export declare function removeEmptyLogFile(path: string): Promise<void>;
/** Best-effort existence probe — the async replacement for `existsSync`. */
export declare function pathExists(path: string): Promise<boolean>;
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