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本帖最后由 seaquester 于 2010-04-20 08:58 编辑
读取RTC时间
冷胜魁(Seaquester)
lengshengkui@gmail.com
2009-11-18
一段简单的代码演示如何使用RTC driver提供的接口读取RTC 时间,并与系统时间做比较。
- #include <stdio.h>
- #include <stdlib.h>
- #include <linux/rtc.h>
- #include <sys/ioctl.h>
- #include <sys/time.h>
- #include <sys/types.h>
- #include <fcntl.h>
- #include <unistd.h>
- #include <errno.h>
- #include <time.h>
-
- int main(void)
- {
- int fd, retval;
- struct rtc_time rtc_tm;
- time_t timep;
- struct tm *p;
- fd = open("/dev/rtc", O_RDONLY);
- if (fd == -1) {
- perror("/dev/rtc");
- exit(errno);
- }
- /* Read the RTC time/date */
- retval = ioctl(fd, RTC_RD_TIME, &rtc_tm);
- if (retval == -1) {
- perror("ioctl");
- exit(errno);
- }
- close(fd);
- fprintf(stderr, "RTC date/time: %d/%d/%d %02d:%02d:%02d\n",
- rtc_tm.tm_mday, rtc_tm.tm_mon + 1, rtc_tm.tm_year + 1900,
- rtc_tm.tm_hour, rtc_tm.tm_min, rtc_tm.tm_sec);
- time(&timep);
- p = gmtime(&timep);
- fprintf(stderr, "OS date/time(UTC): %d/%d/%d %02d:%02d:%02d\n",
- p->tm_mday, p->tm_mon + 1, p->tm_year + 1900,
- p->tm_hour, p->tm_min, p->tm_sec);
-
- p = localtime(&timep);
- fprintf(stderr, "OS date/time(Local): %d/%d/%d %02d:%02d:%02d\n",
- p->tm_mday, p->tm_mon + 1, p->tm_year + 1900,
- p->tm_hour, p->tm_min, p->tm_sec);
-
- return 0;
- }
复制代码
本文来自ChinaUnix博客,如果查看原文请点:http://blog.chinaunix.net/u2/73823/showart_2097552.html |
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