Add simple service Dragonboard

Update init.rc:

commit f2bb12973675d86526cdf5e815b9314b8d51a3e0
Author: Nicklas Ekstrand
Date:   Tue Jun 7 22:04:49 2016 +0200

    Added serivce nicklas
   
    Change-Id: I4eff38d220b5d8bcab7f59ebcede7e7ffe90b02c

diff --git a/rootdir/init.rc b/rootdir/init.rc
index ea2b009..172d02e 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -639,3 +639,9 @@ service pre-recovery /system/bin/uncrypt
     class main
     disabled
     oneshot
+
+service nicklas /system/bin/nicklas
+    class main
+    enabled
+    oneshot

nicklas.c:

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

void mywrite (int x)
{
    FILE *fp = fopen("/sys/class/leds/led3/brightness","w");
    if (fp != NULL)
    {
        fprintf(fp, "%d",x);
        fclose(fp);
    }
}

int main (int argc, char* argv[])
{
    printf ("Nicklas!\n");

    while (1){
        mywrite(255);
        usleep(100000);
        mywrite(0);
        usleep(100000);
    }
    return 0;
}

Compile:

~/android/my64/bin/aarch64-linux-android-gcc -Wall -pedantic nicklas.c -o nicklas -static