Major suspend changes

Posted Jul 4, 2006 15:06 UTC (Tue) by gdt (subscriber, #6284) [Link]

The kernel doesn't notify user space apps. There's no need. Something asked the kernel to go into suspend-to-RAM. That 'something' is in user space and can notify the applications.

As a concrete example, the 'something' might be a ACPI lid button. The action script for that can clean up user space before calling the kernel. I wouldn't worry about Jabber so much as saving and restoring the system time to/from the hardware clock, asking any DHCP client daemons to retry leases, etc.

Of course, it would be very nice if all the 'something's (ACPI, command line, GNOME/KDE) all used the same mechanism. And that's been a long-time area of failure in Linux.