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Full Discussion: How to "hibernate" a process?
Top Forums UNIX for Dummies Questions & Answers How to "hibernate" a process? Post 302498773 by Corona688 on Tuesday 22nd of February 2011 11:56:25 AM
Old 02-22-2011
You've made things much harder on yourself by using files instead of IPC, but all isn't lost. Linux can watch for filesystem changes with the inotify system.

This will make your code unportable though, since inotify is Linux-only, and only relatively modern Linux at that... wait() and waitpid() on the other hand should be available on any sane UNIX and UNIX-like...

You could also use sockets instead of files. Open a socket to your daemon program, write the data you want written, read the data you want read, and close the connection. read() will sleep whenever it's waiting for the other end to send. TCP sockets and UNIX domain sockets should both be doable and quite portable.
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LEARN ABOUT MOJAVE

systemd-hibernate.service

SYSTEMD-SUSPEND.SERVICE(8)				      systemd-suspend.service					SYSTEMD-SUSPEND.SERVICE(8)

NAME

       systemd-suspend.service, systemd-hibernate.service, systemd-hybrid-sleep.service, systemd-suspend-then-hibernate.service, systemd-sleep -
       System sleep state logic

SYNOPSIS

       systemd-suspend.service

       systemd-hibernate.service

       systemd-hybrid-sleep.service

       systemd-suspend-then-hibernate.service

       /lib/systemd/system-sleep

DESCRIPTION

       systemd-suspend.service is a system service that is pulled in by suspend.target and is responsible for the actual system suspend.
       Similarly, systemd-hibernate.service is pulled in by hibernate.target to execute the actual hibernation. Finally,
       systemd-hybrid-sleep.service is pulled in by hybrid-sleep.target to execute hybrid hibernation with system suspend and pulled in by
       suspend-then-hibernate.target to execute system suspend with a timeout that will activate hibernate later.

       Immediately before entering system suspend and/or hibernation systemd-suspend.service (and the other mentioned units, respectively) will
       run all executables in /lib/systemd/system-sleep/ and pass two arguments to them. The first argument will be "pre", the second either
       "suspend", "hibernate", "hybrid-sleep", or "suspend-then-hibernate" depending on the chosen action. Immediately after leaving system
       suspend and/or hibernation the same executables are run, but the first argument is now "post". All executables in this directory are
       executed in parallel, and execution of the action is not continued until all executables have finished.

       Note that scripts or binaries dropped in /lib/systemd/system-sleep/ are intended for local use only and should be considered hacks. If
       applications want to react to system suspend/hibernation and resume, they should rather use the Inhibitor interface[1].

       Note that systemd-suspend.service, systemd-hibernate.service, and systemd-hybrid-sleep.service systemd-suspend-then-hibernate.service
       should never be executed directly. Instead, trigger system sleep states with a command such as "systemctl suspend" or similar.

       Internally, this service will echo a string like "mem" into /sys/power/state, to trigger the actual system suspend. What exactly is written
       where can be configured in the "[Sleep]" section of /etc/systemd/sleep.conf or a sleep.conf.d file. See systemd-sleep.conf(5).

OPTIONS

       systemd-sleep understands the following commands:

       -h, --help
	   Print a short help text and exit.

       --version
	   Print a short version string and exit.

       suspend, hibernate, hybrid-sleep, suspend-then-hibernate
	   Suspend, hibernate, suspend then hibernate, or put the system to hybrid sleep.

SEE ALSO

       systemd-sleep.conf(5), systemd(1), systemctl(1), systemd.special(7), systemd-halt.service(8)

NOTES

	1. Inhibitor interface
	   https://www.freedesktop.org/wiki/Software/systemd/inhibit

systemd 237														SYSTEMD-SUSPEND.SERVICE(8)
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