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8980 BIOS clock is sometimes one hour fast
Reviewed by: Toomas Soome <tsoome@me.com>
Reviewed by: C Fraire <cfraire@me.com>
*** 18,33 ****
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
- #pragma ident "%Z%%M% %I% %E% SMI"
-
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/sysi86.h>
--- 18,32 ----
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
+ * Copyright 2018 Gary Mills
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/sysi86.h>
*** 34,50 ****
--- 33,57 ----
#include <errno.h>
#include <time.h>
#include <string.h>
#include <sys/stat.h>
+ /* RTC modes */
+ #define M_UNSET 0 /* Mode never set */
+ #define M_VAR 1 /* Tracks local time including DST */
+ #define M_UTC 2 /* Clock runs in UTC */
+ #define M_STD 3 /* Clock runs in local standard time */
+
static char *progname;
static char *zonefile = "/etc/rtc_config";
static FILE *zonefptr;
static char zone_info[256];
static char zone_lag[256];
static char tz[256] = "TZ=";
+ static char *utc_zone = "UTC";
int debug = 0;
+ int rtc_mode = M_UNSET;
int lag;
int errors_ok = 0; /* allow "rtc no-args" to be quiet when not configured */
static time_t clock_val;
static char zone_comment[] =
"#\n"
*** 154,178 ****
(void) printf("%s\n", zone_info);
else
(void) printf("GMT\n");
}
! long
! set_zone(char *zone_string)
{
struct tm *tm;
- long current_lag;
- (void) umask(0022);
- if ((zonefptr = fopen(zonefile, "w")) == NULL) {
- (void) fprintf(stderr, "%s: cannot open %s: errno = %d\n",
- progname, zonefile, errno);
- return (0);
- }
-
tz[3] = 0;
! (void) strncat(tz, zone_string, 253);
if (debug)
(void) fprintf(stderr, "Time Zone string is '%s'\n", tz);
(void) putenv(tz);
if (debug)
--- 161,177 ----
(void) printf("%s\n", zone_info);
else
(void) printf("GMT\n");
}
! int
! get_local(char *z)
{
struct tm *tm;
tz[3] = 0;
! (void) strncat(tz, z, 253);
if (debug)
(void) fprintf(stderr, "Time Zone string is '%s'\n", tz);
(void) putenv(tz);
if (debug)
*** 179,235 ****
(void) system("env | grep TZ");
(void) time(&clock_val);
tm = localtime(&clock_val);
! current_lag = tm->tm_isdst ? altzone : timezone;
if (debug)
! (void) printf("%s DST. Lag is %ld.\n", tm->tm_isdst ? "Is" :
! "Is NOT", tm->tm_isdst ? altzone : timezone);
(void) fprintf(zonefptr, zone_comment, zonefile);
(void) fprintf(zonefptr, "zone_info=%s\n", zone_string);
! (void) fprintf(zonefptr, "zone_lag=%ld\n",
! tm->tm_isdst ? altzone : timezone);
(void) fclose(zonefptr);
zonefptr = NULL;
return (current_lag);
}
void
correct_rtc_and_lag()
{
! struct tm *tm;
long kernels_lag;
long current_lag;
if (open_zonefile())
return;
! tz[3] = 0;
! (void) strncat(tz, zone_info, 253);
! if (debug)
! (void) fprintf(stderr, "Time Zone string is '%s'\n", tz);
- (void) putenv(tz);
- if (debug)
- (void) system("env | grep TZ");
-
- (void) time(&clock_val);
- tm = localtime(&clock_val);
- current_lag = tm->tm_isdst ? altzone : timezone;
-
if (current_lag != lag) { /* if file is wrong */
if (debug)
! (void) fprintf(stderr, "correcting file");
(void) set_zone(zone_info); /* then rewrite file */
}
(void) sysi86(GGMTL, &kernels_lag);
if (current_lag != kernels_lag) {
if (debug)
! (void) fprintf(stderr, "correcting kernel's lag");
(void) sysi86(SGMTL, current_lag); /* correct the lag */
(void) sysi86(WTODC); /* set the rtc to */
/* new local time */
}
}
--- 178,264 ----
(void) system("env | grep TZ");
(void) time(&clock_val);
tm = localtime(&clock_val);
! return (tm->tm_isdst);
! }
!
! long
! set_zone(char *zone_string)
! {
! int isdst;
! long current_lag;
!
! (void) umask(0022);
! if ((zonefptr = fopen(zonefile, "w")) == NULL) {
! (void) fprintf(stderr, "%s: cannot open %s: errno = %d\n",
! progname, zonefile, errno);
! return (0);
! }
!
! switch (rtc_mode) {
! case M_VAR:
! isdst = get_local(zone_string);
! current_lag = isdst ? altzone : timezone;
! break;
! case M_STD:
! isdst = get_local(zone_string);
! current_lag = timezone;
! break;
! default: /* Includes M_UTC */
! isdst = 0;
! current_lag = 0;
! zone_string = utc_zone;
! break;
! }
if (debug)
! (void) printf("%s DST. Lag is %ld.\n", isdst ? "Is" :
! "Is NOT", current_lag);
(void) fprintf(zonefptr, zone_comment, zonefile);
(void) fprintf(zonefptr, "zone_info=%s\n", zone_string);
! (void) fprintf(zonefptr, "zone_lag=%ld\n", current_lag);
(void) fclose(zonefptr);
zonefptr = NULL;
return (current_lag);
}
void
correct_rtc_and_lag()
{
! int isdst;
long kernels_lag;
long current_lag;
if (open_zonefile())
return;
! switch (rtc_mode) {
! case M_VAR:
! isdst = get_local(zone_info);
! current_lag = isdst ? altzone : timezone;
! break;
! case M_STD:
! (void) get_local(zone_info);
! current_lag = timezone;
! break;
! default: /* Includes M_UTC */
! current_lag = 0;
! break;
! }
if (current_lag != lag) { /* if file is wrong */
if (debug)
! (void) fprintf(stderr, "correcting file\n");
(void) set_zone(zone_info); /* then rewrite file */
}
(void) sysi86(GGMTL, &kernels_lag);
if (current_lag != kernels_lag) {
if (debug)
! (void) fprintf(stderr, "correcting kernel's lag\n");
(void) sysi86(SGMTL, current_lag); /* correct the lag */
(void) sysi86(WTODC); /* set the rtc to */
/* new local time */
}
}
*** 255,308 ****
void
usage()
{
static char Usage[] = "Usage:\n\
! rtc [-c] [-z time_zone] [-?]\n";
(void) fprintf(stderr, Usage);
}
void
verbose_usage()
{
static char Usage1[] = "\
Options:\n\
-c\t\tCheck and correct for daylight savings time rollover.\n\
-z [zone]\tRecord the zone info in the config file.\n";
(void) fprintf(stderr, Usage1);
}
int
main(int argc, char *argv[])
{
int c;
progname = argv[0];
if (argc == 1) {
errors_ok = 1;
display_zone_string();
}
! while ((c = getopt(argc, argv, "cz:d")) != EOF) {
switch (c) {
case 'c':
! correct_rtc_and_lag();
continue;
case 'z':
! initialize_zone(optarg);
continue;
case 'd':
debug = 1;
continue;
case '?':
verbose_usage();
! return (0);
default:
usage();
! return (1);
}
}
! return (0);
}
--- 284,390 ----
void
usage()
{
static char Usage[] = "Usage:\n\
! rtc [-w] [-s|-u|-v] [-c] [-z time_zone] [-?]\n";
(void) fprintf(stderr, Usage);
}
void
verbose_usage()
{
static char Usage1[] = "\
Options:\n\
+ -w\t\tDoes nothing.\n\
+ -s\t\tRTC runs in local standard time.\n\
+ -u\t\tRTC runs in UTC time.\n\
+ -v\t\tRTC tracks local time (with cron command).\n\
-c\t\tCheck and correct for daylight savings time rollover.\n\
-z [zone]\tRecord the zone info in the config file.\n";
(void) fprintf(stderr, Usage1);
}
+ void
+ set_default()
+ {
+ switch (rtc_mode) {
+ default: /* Includes M_UNSET */
+ rtc_mode = M_VAR;
+ break;
+ case M_VAR:
+ /*FALLTHROUGH*/
+ case M_UTC:
+ /*FALLTHROUGH*/
+ case M_STD:
+ break;
+ }
+ }
+
+ void
+ check_mode(int letter, int mode)
+ {
+ if (rtc_mode == M_UNSET || rtc_mode == mode) {
+ rtc_mode = mode;
+ return;
+ }
+ (void) fprintf(stderr, "%s: option -%c conflicts with other options\n",
+ progname, letter);
+ exit(1);
+ }
+
+
int
main(int argc, char *argv[])
{
int c;
+ int cflg = 0;
+ char *zone_name = NULL;
progname = argv[0];
if (argc == 1) {
errors_ok = 1;
display_zone_string();
+ exit(0);
}
! while ((c = getopt(argc, argv, "suvwcz:d")) != EOF) {
switch (c) {
case 'c':
! cflg++;
continue;
case 'z':
! zone_name = optarg;
continue;
case 'd':
debug = 1;
continue;
+ case 's': /* standard: RTC runs local standard time */
+ check_mode(c, M_STD);
+ continue;
+ case 'u': /* utc: RTC runs UTC time */
+ check_mode(c, M_UTC);
+ continue;
+ case 'v': /* varies: RTC tracks local time */
+ check_mode(c, M_VAR);
+ continue;
+ case 'w': /* Does nothing */
+ continue;
case '?':
verbose_usage();
! exit(0);
default:
usage();
! exit(1);
}
}
! set_default();
! if (zone_name != NULL)
! initialize_zone(zone_name);
! if (cflg > 0)
! correct_rtc_and_lag();
! exit(0);
! /*LINTED*/
}