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77 lines
1.7 KiB
77 lines
1.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* Real Time Clock Driver Test |
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* by: Benjamin Gaignard ([email protected]) |
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* |
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* To build |
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* gcc rtctest_setdate.c -o rtctest_setdate |
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*/ |
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#include <stdio.h> |
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#include <linux/rtc.h> |
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#include <sys/ioctl.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 <unistd.h> |
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#include <stdlib.h> |
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#include <errno.h> |
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static const char default_time[] = "00:00:00"; |
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int main(int argc, char **argv) |
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{ |
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int fd, retval; |
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struct rtc_time new, current; |
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const char *rtc, *date; |
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const char *time = default_time; |
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switch (argc) { |
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case 4: |
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time = argv[3]; |
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/* FALLTHROUGH */ |
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case 3: |
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date = argv[2]; |
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rtc = argv[1]; |
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break; |
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default: |
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fprintf(stderr, "usage: rtctest_setdate <rtcdev> <DD-MM-YYYY> [HH:MM:SS]\n"); |
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return 1; |
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} |
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fd = open(rtc, O_RDONLY); |
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if (fd == -1) { |
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perror(rtc); |
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exit(errno); |
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} |
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sscanf(date, "%d-%d-%d", &new.tm_mday, &new.tm_mon, &new.tm_year); |
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new.tm_mon -= 1; |
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new.tm_year -= 1900; |
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sscanf(time, "%d:%d:%d", &new.tm_hour, &new.tm_min, &new.tm_sec); |
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fprintf(stderr, "Test will set RTC date/time to %d-%d-%d, %02d:%02d:%02d.\n", |
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new.tm_mday, new.tm_mon + 1, new.tm_year + 1900, |
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new.tm_hour, new.tm_min, new.tm_sec); |
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/* Write the new date in RTC */ |
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retval = ioctl(fd, RTC_SET_TIME, &new); |
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if (retval == -1) { |
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perror("RTC_SET_TIME ioctl"); |
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close(fd); |
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exit(errno); |
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} |
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/* Read back */ |
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retval = ioctl(fd, RTC_RD_TIME, ¤t); |
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if (retval == -1) { |
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perror("RTC_RD_TIME ioctl"); |
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exit(errno); |
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} |
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fprintf(stderr, "\n\nCurrent RTC date/time is %d-%d-%d, %02d:%02d:%02d.\n", |
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current.tm_mday, current.tm_mon + 1, current.tm_year + 1900, |
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current.tm_hour, current.tm_min, current.tm_sec); |
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close(fd); |
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return 0; |
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}
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