[ts-7000] How to do soft shutdown with watchdog timer?

["Rekcut_Nod" <>]

I'm using a TS-7260.  I monitor a DIO line for the user to shutdown the system, 
at which point I want to close all open ports and devices, and issue a 
"shutdown -h now" command via popen (I'm writing c code).

My question is, if the watchdog is initialized and fed by:

int fd = open("/dev/mem", O_RDWR|O_SYNC);
volatile unsigned char *wdt_control;
volatile unsigned char *wdt_feedl;

wdt_control = (unsigned 
char*)mmap(0,getpagesize(),PROT_READ|PROT_WRITE,MAP_SHARED,fd,0x23800000);
wdt_feed = (unsigned 
char*)mmap(0,getpagesize(),PROT_READ|PROT_WRITE,MAP_SHARED,fd,0x23C00000);

*wdt_feed=0x05;
*wdt_control=0x07;//set duration to max = 8 seconds

how can I call fclose(fd)?  I don't want the watchdog to reset the board before 
the "shutdown -h now" is finished, nor do I want the program to be terminated 
by the shutdown command before I've safely released /dev/mem. Any suggestions?



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