159 lines
2.6 KiB
C
159 lines
2.6 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include "rtc.h"
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#include "util.h"
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static void
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readrtctm(struct tm *tm, int fd)
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{
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struct rtc_time rt;
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memset(&rt, 0, sizeof(rt));
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if (ioctl(fd, RTC_RD_TIME, &rt) < 0)
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eprintf("RTC_RD_TIME:");
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tm->tm_sec = rt.tm_sec;
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tm->tm_min = rt.tm_min;
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tm->tm_hour = rt.tm_hour;
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tm->tm_mday = rt.tm_mday;
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tm->tm_mon = rt.tm_mon;
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tm->tm_year = rt.tm_year;
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tm->tm_wday = rt.tm_wday;
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tm->tm_yday = rt.tm_yday;
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tm->tm_isdst = rt.tm_isdst;
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}
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static void
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writertctm(struct tm *tm, int fd)
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{
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struct rtc_time rt;
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rt.tm_sec = tm->tm_sec;
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rt.tm_min = tm->tm_min;
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rt.tm_hour = tm->tm_hour;
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rt.tm_mday = tm->tm_mday;
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rt.tm_mon = tm->tm_mon;
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rt.tm_year = tm->tm_year;
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rt.tm_wday = tm->tm_wday;
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rt.tm_yday = tm->tm_yday;
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rt.tm_isdst = tm->tm_isdst;
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if (ioctl(fd, RTC_SET_TIME, &rt) < 0)
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eprintf("RTC_SET_TIME:");
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}
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static void
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show(char *dev)
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{
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struct tm tm;
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time_t t;
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int fd;
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fd = open(dev, O_RDONLY);
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if (fd < 0)
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eprintf("open %s:", dev);
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readrtctm(&tm, fd);
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t = mktime(&tm);
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printf("%s", asctime(localtime(&t)));
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close(fd);
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}
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static void
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hctosys(char *dev)
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{
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struct timeval tv;
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struct tm tm;
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int r;
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int fd;
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fd = open(dev, O_RDONLY);
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if (fd < 0)
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eprintf("open %s:", dev);
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readrtctm(&tm, fd);
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tv.tv_sec = mktime(&tm);
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tv.tv_usec = 0;
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r = settimeofday(&tv, NULL);
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if (r < 0)
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eprintf("settimeofday:");
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close(fd);
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}
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static void
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systohc(char *dev)
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{
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struct timeval tv;
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struct tm *tm;
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time_t t;
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int fd;
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fd = open(dev, O_WRONLY);
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if (fd < 0)
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eprintf("open %s:", dev);
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gettimeofday(&tv, NULL);
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t = tv.tv_sec;
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tm = gmtime(&t);
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weprintf("warning: assuming UTC for systohc\n");
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writertctm(tm, fd);
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close(fd);
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}
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static void
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usage(void)
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{
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eprintf("usage: %s [-rsw] [-u] [dev]\n", argv0);
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}
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int
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main(int argc, char *argv[])
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{
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char *dev = "/dev/rtc";
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int rflag = 0;
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int sflag = 0;
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int wflag = 0;
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ARGBEGIN {
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case 'r':
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rflag = 1;
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break;
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case 's':
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sflag = 1;
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break;
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case 'w':
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wflag = 1;
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break;
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case 'u':
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break;
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default:
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usage();
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} ARGEND;
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if (argc > 1)
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usage();
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else if (argc == 1)
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dev = argv[0];
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if ((rflag ^ sflag ^ wflag) == 0)
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eprintf("missing or incompatible function\n");
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/* Only UTC support at the moment */
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setenv("TZ", "UTC0", 1);
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tzset();
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if (rflag == 1)
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show(dev);
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else if (sflag == 1)
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hctosys(dev);
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else if (wflag == 1)
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systohc(dev);
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return 0;
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} |