How to detect whether system is going to standby in Linux using C

Question

I want to know how I can detect whether the system is going to a standby mode in Linux using C. I found a message called WM_POWERBROADCAST in windows for that purpose, which sends this message before going to the sleep mode.

Is there any alternatives in C, for Linux?

I heard that DBus can be used for same purpose, could somebody explain it more?

possible duplicate of http://stackoverflow.com/questions/6136111/are-there-suspend-resume-signals-in-linux — zed_0xff, Jan 17 '13 at 10:13
This is more a duplicate of http://stackoverflow.com/questions/2832376/how-to-detect-pending-system-shutdown-on-linux — greydet, Jan 17 '13 at 10:28

score 6 · Accepted Answer · answered Jan 22 '13 at 07:50

Finally I found a solution.

We can use the pm utility for that.

If you put any shell script in /etc/pm/sleep.d folder it will be executed automatically just before the system going to sleep and after the system is resumed.

The content will be like


#!/bin/bash
case $1 in
suspend)
    #suspending to RAM
    /home/harikrishnan/Desktop/sleepd Sleeping
    ;;
resume)
    #resume from suspend
    sleep 3
    /home/harikrishnan/Desktop/sleepd Woken
    ;;
esac

here it will execute the /home/harikrishnan/Desktop/sleepd program with the arguments

score 2 · Answer 2 · edited Apr 13 '17 at 12:13

2

AFAIK there's no such signal in Linux, but you can try

a) acpid daemon hooks, if its present, acpid configs are usually in /etc/acpi
b) DBus daemon hooks, again if its presend on a system
c) reading acpid sources to see how it gets the signals
d) writing your own kernel module

edited Apr 13 '17 at 12:13

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answered Jan 17 '13 at 10:28

zed_0xff

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Could you please tell me ow to use the DBus daemon hooks within a program – Harikrishnan Jan 17 '13 at 12:58
No, sorry, never did that. – zed_0xff Jan 17 '13 at 21:08
hmm, what to do next, I tried to use wine, but in that the WM_POWERBROADCAST is not detecting – Harikrishnan Jan 19 '13 at 07:44

How to detect whether system is going to standby in Linux using C

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