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/* frontend to the readclock.drv driver for getting/setting hw clock. */
#include <sys/cdefs.h>
#include <lib.h>
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <time.h>
#include <errno.h>
#include <minix/type.h>
#include <minix/const.h>
#include <minix/syslib.h>
#include <minix/sysutil.h>
#include <minix/com.h>
#include <minix/rs.h>
#include <sys/ipc.h>
void errmsg(char *s);
static void readclock(int type, struct tm *t, int flags);
void usage(void);
int quiet = 0;
int
main(int argc, char **argv)
{
int flags = RTCDEV_NOFLAGS;
int nflag = 0; /* Tell what, but don't do it. */
int wflag = 0; /* Set the CMOS clock. */
struct tm time1;
struct tm time2;
struct tm tmnow;
char date[64];
time_t now, rtc;
int i, s;
/* Process options. */
while (argc > 1) {
char *p = *++argv;
if (*p++ != '-')
usage();
while (*p != 0) {
switch (*p++) {
case 'n':
nflag = 1;
break;
case 'w':
wflag = 1;
break;
case 'W':
flags |= RTCDEV_CMOSREG;
wflag = 1; /* -W implies -w */
break;
case '2':
flags |= RTCDEV_Y2KBUG;
break;
case 'q':
quiet = 1;
break;
default:
usage();
}
}
argc--;
}
/* Read the CMOS real time clock. */
for (i = 0; i < 10; i++) {
readclock(RTCDEV_GET_TIME, &time1, flags);
now = time(NULL);
time1.tm_isdst = -1; /* Do timezone calculations. */
time2 = time1;
rtc = mktime(&time1); /* Transform to a time_t. */
if (rtc != -1)
break;
if (!quiet) printf
("readclock: Invalid time read from CMOS RTC: %d-%02d-%02d %02d:%02d:%02d\n",
time2.tm_year + 1900, time2.tm_mon + 1, time2.tm_mday,
time2.tm_hour, time2.tm_min, time2.tm_sec);
sleep(5);
}
if (i == 10)
exit(1);
if (!wflag) {
/* Set system time. */
if (nflag) {
if (!quiet)
printf("stime(%lu)\n", (unsigned long) rtc);
} else {
if (stime(&rtc) < 0) {
if (!quiet)
errmsg("Not allowed to set time.");
exit(1);
}
}
tmnow = *localtime(&rtc);
if (strftime(date, sizeof(date),
"%a %b %d %H:%M:%S %Z %Y", &tmnow) != 0) {
if (date[8] == '0')
date[8] = ' ';
if (!quiet) printf("%s\n", date);
}
} else {
/* Set the CMOS clock to the system time. */
tmnow = *localtime(&now);
if (nflag) {
if (!quiet)
printf("%04d-%02d-%02d %02d:%02d:%02d\n",
tmnow.tm_year + 1900,
tmnow.tm_mon + 1,
tmnow.tm_mday,
tmnow.tm_hour, tmnow.tm_min, tmnow.tm_sec);
} else {
readclock(RTCDEV_SET_TIME, &tmnow, flags);
}
}
exit(0);
}
void
errmsg(char *s)
{
static char *prompt = "readclock: ";
if (!quiet) printf("%s%s\n", prompt, s);
prompt = "";
}
static void
readclock(int type, struct tm *t, int flags)
{
int r;
message m;
endpoint_t ep;
r = minix_rs_lookup("readclock.drv", &ep);
if (r != 0) {
if (!quiet) errmsg("Couldn't locate readclock.drv\n");
exit(1);
}
memset(&m, 0, sizeof(m));
m.m_lc_readclock_rtcdev.tm = (vir_bytes)t;
m.m_lc_readclock_rtcdev.flags = flags;
r = _syscall(ep, type, &m);
if (r != RTCDEV_REPLY || m.m_readclock_lc_rtcdev.status != 0) {
if (!quiet) errmsg("Call to readclock.drv failed\n");
exit(1);
}
}
void
usage(void)
{
if (!quiet) printf("Usage: readclock [-nqwW2]\n");
exit(1);
}
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