--- /dev/null
+/* setime - set the system time from the real time clock
+ Authors: T. Holm & E. Froese
+ Adapted by: Jorrit .N. Herder */
+
+#define _MINIX
+/************************************************************************/
+/* Readclock was updated for security reasons: openeing /dev/mem no */
+/* longer automatically grants I/O privileges to the calling process */
+/* so that the CMOS' clock could not be read from this program. The */
+/* new approach is to rely on the FS to do the CMOS I/O, via the new */
+/* system call CMOSTIME (which only reads the current clock value and */
+/* cannot update the CMOS clock). */
+/* The original readclock.c is still available under backup.c. */
+/************************************************************************/
+/* */
+/* readclock.c */
+/* */
+/* Read the clock value from the 64 byte CMOS RAM */
+/* area, then set system time. */
+/* */
+/* If the machine ID byte is 0xFC or 0xF8, the device */
+/* /dev/mem exists and can be opened for reading, */
+/* and no errors in the CMOS RAM are reported by the */
+/* RTC, then the time is read from the clock RAM */
+/* area maintained by the RTC. */
+/* */
+/* The clock RAM values are decoded and fed to mktime */
+/* to make a time_t value, then stime(2) is called. */
+/* */
+/* This fails if: */
+/* */
+/* If the machine ID does not match 0xFC or 0xF8 (no */
+/* error message.) */
+/* */
+/* If the machine ID is 0xFC or 0xF8 and /dev/mem */
+/* is missing, or cannot be accessed. */
+/* */
+/* If the RTC reports errors in the CMOS RAM. */
+/* */
+/************************************************************************/
+/* origination 1987-Dec-29 efth */
+/* robustness 1990-Oct-06 C. Sylvain */
+/* incorp. B. Evans ideas 1991-Jul-06 C. Sylvain */
+/* set time & calibrate 1992-Dec-17 Kees J. Bot */
+/* clock timezone 1993-Oct-10 Kees J. Bot */
+/* set CMOS clock 1994-Jun-12 Kees J. Bot */
+/* removed set CMOS 2004-Sep-06 Jorrit N. Herder */
+/************************************************************************/
+
+#include <minix/callnr.h>
+#include <minix/config.h>
+#include <minix/type.h>
+#include <minix/const.h>
+#include <minix/com.h>
+#include <minix/syslib.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioc_cmos.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+#include <errno.h>
+#include <signal.h>
+#include <ibm/portio.h>
+#include <ibm/cmos.h>
+#include <sys/svrctl.h>
+
+#define MAX_RETRIES 1
+
+int nflag = 0; /* Tell what, but don't do it. */
+int y2kflag = 0; /* Interpret 1980 as 2000 for clock with Y2K bug. */
+
+char clocktz[128]; /* Timezone of the clock. */
+
+#define MACH_ID_ADDR 0xFFFFE /* BIOS Machine ID at FFFF:000E */
+
+#define PC_AT 0xFC /* Machine ID byte for PC/AT,
+ PC/XT286, and PS/2 Models 50, 60 */
+#define PS_386 0xF8 /* Machine ID byte for PS/2 Model 80 */
+
+/* Manufacturers usually use the ID value of the IBM model they emulate.
+ * However some manufacturers, notably HP and COMPAQ, have had different
+ * ideas in the past.
+ *
+ * Machine ID byte information source:
+ * _The Programmer's PC Sourcebook_ by Thom Hogan,
+ * published by Microsoft Press
+ */
+
+void errmsg(char *s);
+int bcd_to_dec(int n);
+int dec_to_bcd(int n);
+void usage(void);
+
+#define CMOS_DEV "/dev/cmos"
+
+PUBLIC int main(int argc, char **argv)
+{
+ int fd;
+ struct tm time1;
+ struct tm time2;
+ struct tm tmnow;
+ char date[64];
+ time_t now, rtc;
+ int i, s, mem;
+ unsigned char mach_id, cmos_state;
+ struct sysgetenv sysgetenv;
+ message m;
+ int request;
+
+
+ /* Process options. */
+ while (argc > 1) {
+ char *p = *++argv;
+
+ if (*p++ != '-') usage();
+
+ while (*p != 0) {
+ switch (*p++) {
+ case 'n': nflag = 1; break;
+ case '2': y2kflag = 1; break;
+ default: usage();
+ }
+ }
+ argc--;
+ }
+
+#if DEAD_CODE
+ /* The hardware clock may run in a different time zone, likely GMT or
+ * winter time. Select that time zone.
+ */
+ strcpy(clocktz, "TZ=");
+ sysgetenv.key = "TZ";
+ sysgetenv.keylen = 2+1;
+ sysgetenv.val = clocktz+3;
+ sysgetenv.vallen = sizeof(clocktz)-3;
+ if (svrctl(SYSGETENV, &sysgetenv) == 0) {
+ putenv(clocktz);
+ tzset();
+ }
+#endif
+
+ /* Read the CMOS real time clock. */
+ for (i = 0; i < MAX_RETRIES; i++) {
+
+ /* sleep, unless first iteration */
+ if (i > 0) sleep(5);
+
+ /* Open the CMOS device to read the system time. */
+ if ((fd = open(CMOS_DEV, O_RDONLY)) < 0) {
+ fprintf(stderr, "Couldn't open CMOS device: %d.\n",s);
+ exit(1);
+ }
+ request = (y2kflag) ? CIOCGETTIME : CIOCGETTIMEY2K;
+ if ((s=ioctl(fd, request, (void *) &time1)) < 0) {
+ fprintf(stderr, "Couldn't do CMOS ioctl: %d.\n",s);
+ exit(1);
+ }
+ close(fd);
+
+ now = time(NULL);
+
+ time1.tm_isdst = -1; /* Do timezone calculations. */
+ time2 = time1;
+
+ rtc= mktime(&time1); /* Transform to a time_t. */
+ if (rtc != -1) {
+ printf("rtc from CMOS driver: %u\n", rtc);
+ break;
+ }
+
+ fprintf(stderr,
+"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);
+ }
+ if (i >= MAX_RETRIES) exit(1);
+
+ /* Now set system time. */
+ if (nflag) {
+ printf("stime(%lu)\n", (unsigned long) rtc);
+ } else {
+ if (stime(&rtc) < 0) {
+ 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 0
+ printf("%s [CMOS read via FS, see command/ibm/readclock.c]\n", date);
+#endif
+ }
+ exit(0);
+}
+
+void errmsg(char *s)
+{
+ static char *prompt = "readclock: ";
+
+ fprintf(stderr, "%s%s\n", prompt, s);
+ prompt = "";
+}
+
+
+int bcd_to_dec(int n)
+{
+ return ((n >> 4) & 0x0F) * 10 + (n & 0x0F);
+}
+
+int dec_to_bcd(int n)
+{
+ return ((n / 10) << 4) | (n % 10);
+}
+
+void usage(void)
+{
+ fprintf(stderr, "Usage: settime [-n2]\n");
+ exit(1);
+}