I am the originator of the GNU mcron app, which waits (using select) for set amounts of time before executing some function on behalf of the user. But when the system comes out of sleep the timings are all wrong and need to be re-evaluated. But how does my application know when this needs to happen? I'm currently trying to use the ACPI netlink interface, which conveniently gives me a socket I can add to the select call and wakes me up when some power-changing event occurs. However, there is not an event specifically for notifying the coming out of sleep, and different systems will have different hardware which reacts in this situation (the netlink interface has a soft specification and requires introspection to understand the data it delivers). What is the 'official' way to do this?
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