am f1da46d2: am d27498cb: Merge "toolbox: date: use RTC subsystem on devices without /dev/alarm"

#include <errno.h>

#include <time.h>

#include <linux/android_alarm.h>

#include <linux/rtc.h>

#include <sys/ioctl.h>

static int settime_alarm(struct timespec *ts) {

    int fd, ret;

    fd = open("/dev/alarm", O_RDWR);

    if (fd < 0)

        return fd;

    ret = ioctl(fd, ANDROID_ALARM_SET_RTC, &ts);

    close(fd);

    return ret;

}

static int settime_alarm_tm(struct tm *tm) {

    time_t t;

    struct timespec ts;

    t = mktime(tm);

    ts.tv_sec = t;

    ts.tv_nsec = 0;

    return settime_alarm(&ts);

}

static int settime_alarm_timeval(struct timeval *tv) {

    struct timespec ts;

    ts.tv_sec = tv->tv_sec;

    ts.tv_nsec = tv->tv_usec * 1000;

    return settime_alarm(&ts);

}

static int settime_rtc_tm(struct tm *tm) {

    int fd, ret;

    struct timeval tv;

    struct rtc_time rtc;

    fd = open("/dev/rtc0", O_RDWR);

    if (fd < 0)

        return fd;

    tv.tv_sec = mktime(tm);

    tv.tv_usec = 0;

    ret = settimeofday(&tv, NULL);

    if (ret < 0)

        goto done;

    memset(&rtc, 0, sizeof(rtc));

    rtc.tm_sec = tm->tm_sec;

    rtc.tm_min = tm->tm_min;

    rtc.tm_hour = tm->tm_hour;

    rtc.tm_mday = tm->tm_mday;

    rtc.tm_mon = tm->tm_mon;

    rtc.tm_year = tm->tm_year;

    rtc.tm_wday = tm->tm_wday;

    rtc.tm_yday = tm->tm_yday;

    rtc.tm_isdst = tm->tm_isdst;

    ret = ioctl(fd, RTC_SET_TIME, rtc);

done:

    close(fd);

    return ret;

}

static int settime_rtc_timeval(struct timeval *tv) {

    struct tm tm, *err;

    time_t t = tv->tv_sec;

    err = gmtime_r(&t, &tm);

    if (!err)

        return -1;

    return settime_rtc_tm(&tm);

}

static void settime(char *s) {

    struct tm tm;

    int day = atoi(s);

    int hour;

    time_t t;

    int fd;

    struct timespec ts;

    while (*s && *s != '.')

        s++;

    tm.tm_sec = (hour % 100);

    tm.tm_isdst = -1;

    t = mktime(&tm);

    fd = open("/dev/alarm", O_RDWR);

    ts.tv_sec = t;

    ts.tv_nsec = 0;

    ioctl(fd, ANDROID_ALARM_SET_RTC, &ts);

    if (settime_alarm_tm(&tm) < 0)

        settime_rtc_tm(&tm);

}

int date_main(int argc, char *argv[])

        //tv.tv_usec = 0;

        strtotimeval(argv[optind], &tv);

        printf("time %s -> %lu.%lu\n", argv[optind], tv.tv_sec, tv.tv_usec);

        fd = open("/dev/alarm", O_RDWR);

        ts.tv_sec = tv.tv_sec;

        ts.tv_nsec = tv.tv_usec * 1000;

        res = ioctl(fd, ANDROID_ALARM_SET_RTC, &ts);

        //res = settimeofday(&tv, NULL);

        res = settime_alarm_timeval(&tv);

        if (res < 0)

            res = settime_rtc_timeval(&tv);

        if(res < 0) {

            fprintf(stderr,"settimeofday failed %s\n", strerror(errno));

            return 1;