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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*/ }