nixpkgs/nixos/modules/security/rtkit.nix

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# A module for rtkit, a DBus system service that hands out realtime
# scheduling priority to processes that ask for it.
{ config, pkgs, ... }:
with pkgs.lib;
{
options = {
security.rtkit.enable = mkOption {
default = false;
description = ''
Whether to enable the RealtimeKit system service, which hands
out realtime scheduling priority to user processes on
demand. For example, the PulseAudio server uses this to
acquire realtime priority.
'';
};
};
config = mkIf config.security.rtkit.enable {
environment.systemPackages = [ pkgs.rtkit ];
services.dbus.packages = [ pkgs.rtkit ];
users.extraUsers = singleton
{ name = "rtkit";
uid = config.ids.uids.rtkit;
description = "RealtimeKit daemon";
};
};
}