Advantech RSB-4210 Evaluation Kit Manuel d'utilisateur télécharger pdf (Page 90)

RSB-4210 User Manual 82

fprintf(stderr, "\nAgain, from using select(2) on /dev/

rtc:");

fflush(stderr);

for (i=1; i<6; i++) {

struct timeval tv = {5, 0}; /* 5 second timeout

on select */

fd_set readfds;

FD_ZERO(&readfds);

FD_SET(fd, &readfds);

/* The select will wait until an RTC interrupt hap-

pens. */

retval = select(fd+1, &readfds, NULL, NULL, &tv);

if (retval == -1) {

perror("select");

exit(errno);

}

/* This read won't block unlike the select-less case

above. */

retval = read(fd, &data, sizeof(unsigned long));

if (retval == -1) {

perror("read");

exit(errno);

}

fprintf(stderr, " %d",i);

fflush(stderr);

irqcount++;

}

/* Turn off update interrupts */

retval = ioctl(fd, RTC_UIE_OFF, 0);

if (retval == -1) {

perror("RTC_UIE_OFF ioctl");

exit(errno);

}

test_READ:

/* Read the RTC time/date */

retval = ioctl(fd, RTC_RD_TIME, &rtc_tm);

if (retval == -1) {

perror("RTC_RD_TIME ioctl");

exit(errno);

}

fprintf(stderr, "\n\nCurrent RTC date/time is %d-%d-%d,

%02d:%02d:%02d.\n",

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Advantech RSB-4210 Evaluation Kit Manuel d'utilisateur Page 90

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