/*- * Copyright (c) 1988 University of Utah. * Copyright (c) 1982, 1990, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: Utah $Hdr: clock.c 1.18 91/01/21$ * from: @(#)clock.c 8.2 (Berkeley) 1/12/94 * from: NetBSD: clock_subr.c,v 1.6 2001/07/07 17:04:02 thorpej Exp * and * from: src/sys/i386/isa/clock.c,v 1.176 2001/09/04 */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include int tz_minuteswest; int tz_dsttime; /* * The adjkerntz and wall_cmos_clock sysctls are in the "machdep" sysctl * namespace because they were misplaced there originally. */ static int adjkerntz; static int sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS) { int error; error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req); if (!error && req->newptr) resettodr(); return (error); } SYSCTL_PROC(_machdep, OID_AUTO, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "Local offset from UTC in seconds"); static int ct_debug; SYSCTL_INT(_debug, OID_AUTO, clocktime, CTLFLAG_RW, &ct_debug, 0, "Enable printing of clocktime debugging"); static int wall_cmos_clock; SYSCTL_INT(_machdep, OID_AUTO, wall_cmos_clock, CTLFLAG_RW, &wall_cmos_clock, 0, "Enables application of machdep.adjkerntz"); /*--------------------------------------------------------------------* * Generic routines to convert between a POSIX date * (seconds since 1/1/1970) and yr/mo/day/hr/min/sec * Derived from NetBSD arch/hp300/hp300/clock.c */ #define FEBRUARY 2 #define days_in_year(y) (leapyear(y) ? 366 : 365) #define days_in_month(y, m) \ (month_days[(m) - 1] + (m == FEBRUARY ? leapyear(y) : 0)) /* Day of week. Days are counted from 1/1/1970, which was a Thursday */ #define day_of_week(days) (((days) + 4) % 7) static const int month_days[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; /* * This inline avoids some unnecessary modulo operations * as compared with the usual macro: * ( ((year % 4) == 0 && * (year % 100) != 0) || * ((year % 400) == 0) ) * It is otherwise equivalent. */ static int leapyear(int year) { int rv = 0; if ((year & 3) == 0) { rv = 1; if ((year % 100) == 0) { rv = 0; if ((year % 400) == 0) rv = 1; } } return (rv); } static void print_ct(struct clocktime *ct) { printf("[%04d-%02d-%02d %02d:%02d:%02d]", ct->year, ct->mon, ct->day, ct->hour, ct->min, ct->sec); } int clock_ct_to_ts(struct clocktime *ct, struct timespec *ts) { int i, year, days; year = ct->year; if (ct_debug) { printf("ct_to_ts("); print_ct(ct); printf(")"); } /* Sanity checks. */ if (ct->mon < 1 || ct->mon > 12 || ct->day < 1 || ct->day > days_in_month(year, ct->mon) || ct->hour > 23 || ct->min > 59 || ct->sec > 59 || (sizeof(time_t) == 4 && year > 2037)) { /* time_t overflow */ if (ct_debug) printf(" = EINVAL\n"); return (EINVAL); } /* * Compute days since start of time * First from years, then from months. */ days = 0; for (i = POSIX_BASE_YEAR; i < year; i++) days += days_in_year(i); /* Months */ for (i = 1; i < ct->mon; i++) days += days_in_month(year, i); days += (ct->day - 1); ts->tv_sec = (((time_t)days * 24 + ct->hour) * 60 + ct->min) * 60 + ct->sec; ts->tv_nsec = ct->nsec; if (ct_debug) printf(" = %ld.%09ld\n", (long)ts->tv_sec, (long)ts->tv_nsec); return (0); } void clock_ts_to_ct(struct timespec *ts, struct clocktime *ct) { int i, year, days; time_t rsec; /* remainder seconds */ time_t secs; secs = ts->tv_sec; days = secs / SECDAY; rsec = secs % SECDAY; ct->dow = day_of_week(days); /* Subtract out whole years, counting them in i. */ for (year = POSIX_BASE_YEAR; days >= days_in_year(year); year++) days -= days_in_year(year); ct->year = year; /* Subtract out whole months, counting them in i. */ for (i = 1; days >= days_in_month(year, i); i++) days -= days_in_month(year, i); ct->mon = i; /* Days are what is left over (+1) from all that. */ ct->day = days + 1; /* Hours, minutes, seconds are easy */ ct->hour = rsec / 3600; rsec = rsec % 3600; ct->min = rsec / 60; rsec = rsec % 60; ct->sec = rsec; ct->nsec = ts->tv_nsec; if (ct_debug) { printf("ts_to_ct(%ld.%09ld) = ", (long)ts->tv_sec, (long)ts->tv_nsec); print_ct(ct); printf("\n"); } } int utc_offset(void) { return (tz_minuteswest * 60 + (wall_cmos_clock ? adjkerntz : 0)); }