I am trying to shutdown linux ( Linux beaglebone 3.8.13 #1 SMP Wed Jun 5 11:21:00 CEST 2013 armv7l GNU/Linux )when the AC power cord is removed from the beaglebone, I have a battery backup attached.
I have tried multiple shell files and python scripts and finally an application. If I run any from the cli things work just fine. If I run form cron with @reboot I can see from the logs that the i2cget return nothing.
I have tried scripts starting other scripts, I have tried starting scripts with nohup I have tried a lot of stuff.
What am I missing here, all I need to do is read register 10 (0xA) of the PMIC (i2cget -y -f 0 0x24 0xA) and if bit 4 is zero call shutdown.
If anyone can help I would be grateful
thanks.
the application main follows:
main(int argc, char *argv[])
{
FILE *fp;
char path[64];
int res;
if(log_init("pmon.log") != RC_OK)
{
printf("cannot open file for logging\n");
}
slog(1,"Log Starter");
while(1)
{
fp = popen("i2cget -f -y 0 0x24 0xa","r");
if(fp == NULL)
{
slog(1,"failed to open pipe \n");
exit(-1);
}
fgets(path,64,fp);
slog(1, "i2cget = %s",path);
res = (int)strtol(path,NULL,0);
pclose(fp);
if((((unsigned char)res) & 0x8) == 0)
{
slog(1,"Noted AC power gone.");
fp=popen("shutdown","r");
if(fp == NULL)
{
slog(1,"failed to open pipe \n");
exit(-1);
}
pclose(fp);
exit(0);
}
sleep(5);
}
}
