Moxa Technologies UC-7420/7410 - Manual (Page 84)

UC-7420/7410 User’s Manual Programmer’s Guide
5-8
#include
#include
#include
#include
#include
static void mydelay(unsigned long msec)
{
struct timeval time;
time.tv_sec = msec / 1000;
time.tv_usec = (msec % 1000) * 1000;
select(1, NULL, NULL, NULL, &time);
}
static int swtdfd;
static int stopflag=0;
static void stop_swatchdog()
{
stopflag = 1;
}
static void do_swatchdog(void)
{
swtd_enable(swtdfd, 500);
while ( stopflag == 0 ) {
mydelay(250);
swtd_ack(swtdfd);
}
swtd_disable(swtdfd);
}
int main(int argc, char *argv[])
{
pid_t sonpid;
signal(SIGUSR1, stop_swatchdog);
swtdfd = swtd_open();
if ( swtdfd < 0 ) {
printf(“Open sWatchDog device fail !\n”);
exit(1);
}
if ( (sonpid=fork()) == 0 )
do_swatchdog();
// do user application main function
…..
…..
…..
// end user application
kill(sonpid, SIGUSR1);
swtd_close(swtdfd);
exit(1);
}
The makefile is shown below:
all:
mxscaleb-gcc –o xxxx xxxx.c –lmoxalib