The subprocuser variable contains the user name under which all policy server host (that is, pbmasterd) subprocesses run (for example, commands that are run using the system() function). By default, all policy server host sub-processes run as root.
subprocuser = string;
A string that specifies a user name. The default value is root.
subprocuser = "user";
For more information, please see system.