Checking the operating system

You can use the Check System (QYDOCHKS) API to check if any key operating system object has been changed since it was signed.

Any object that is not signed or has been changed since it was signed will be reported as an error. Only signatures from a system trusted source are valid.

Running the QYDOCHKS API requires *AUDIT special authority. The API might take a long time to run because of the calculations it performs. You should run it at a time when your system is not busy.