linux RTC 開發

#include <linux/rtc.h>
#include <sys/ioctl.h>

void ReadRTC()
{
 int fdrtc = open("/dev/rtc",O_RDONLY);
 if (fdrtc == -1){
  perror("/dev/rtc");
  return;
 }
 struct rtc_time rtc_tm;
 int retval = ioctl(fdrtc,RTC_RD_TIME,&rtc_tm);
 if (retval == -1){
  perror("ioctl");
  close(fdrtc);
  return;
 }
 char cTime[100] = {0};
 sprintf(cTime,"now time is :%d-%d-%d %02d:%02d:%02d/n",
  rtc_tm.tm_year + 1900,rtc_tm.tm_mon + 1,rtc_tm.tm_mday,rtc_tm.tm_hour,rtc_tm.tm_min,rtc_tm.tm_sec);
 printf(cTime);
 close(fdrtc);
}
void SetRTC()
{
 int fdrtc = open("/dev/rtc",O_RDONLY);
 if (fdrtc == -1){
  perror("/dev/rtc");
  return;
 }
 struct rtc_time rtc_tm;
 int retval = ioctl(fdrtc,RTC_RD_TIME,&rtc_tm);
 if (retval == -1){
  perror("ioctl");
  close(fdrtc);
  return;
 }
 rtc_tm.tm_year = 111;
 rtc_tm.tm_mon = 0;
 rtc_tm.tm_mday = 20;
 rtc_tm.tm_hour = 19;
 int nInput = 0;
 printf("input -1,to stop set time/n");
 scanf("%d",&nInput);
 if (nInput == -1){
  return;
 }
 rtc_tm.tm_min = nInput;
 scanf("%d",&nInput);
 if (nInput == -1){
  return;
 }
 rtc_tm.tm_sec = nInput;
 //set time
 retval = ioctl(fdrtc,RTC_SET_TIME,&rtc_tm);
 if (retval == -1){
  perror("ioctl");
  close(fdrtc);
  return;
 }
 close(fdrtc);
}