2 Unix SMB/CIFS implementation.
3 time handling functions
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Stefan (metze) Metzmacher 2002
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 This stuff was largely rewritten by Paul Eggert <eggert@twinsun.com>
29 int extra_time_offset = 0;
36 #define TIME_T_MIN ((time_t)0 < (time_t) -1 ? (time_t) 0 \
37 : ~ (time_t) 0 << (sizeof (time_t) * CHAR_BIT - 1))
40 #define TIME_T_MAX (~ (time_t) 0 - TIME_T_MIN)
43 void get_nttime_max(NTTIME *t)
45 /* FIXME: This is incorrect */
46 unix_to_nt_time(t, get_time_t_max());
49 /*******************************************************************
50 External access to time_t_min and time_t_max.
51 ********************************************************************/
53 time_t get_time_t_max(void)
58 /*******************************************************************
59 a gettimeofday wrapper
60 ********************************************************************/
61 void GetTimeOfDay(struct timeval *tval)
63 #ifdef HAVE_GETTIMEOFDAY_TZ
64 gettimeofday(tval,NULL);
70 #define TM_YEAR_BASE 1900
72 /*******************************************************************
73 yield the difference between *A and *B, in seconds, ignoring leap seconds
74 ********************************************************************/
75 static int tm_diff(struct tm *a, struct tm *b)
77 int ay = a->tm_year + (TM_YEAR_BASE - 1);
78 int by = b->tm_year + (TM_YEAR_BASE - 1);
79 int intervening_leap_days =
80 (ay/4 - by/4) - (ay/100 - by/100) + (ay/400 - by/400);
82 int days = 365*years + intervening_leap_days + (a->tm_yday - b->tm_yday);
83 int hours = 24*days + (a->tm_hour - b->tm_hour);
84 int minutes = 60*hours + (a->tm_min - b->tm_min);
85 int seconds = 60*minutes + (a->tm_sec - b->tm_sec);
90 /*******************************************************************
91 return the UTC offset in seconds west of UTC, or 0 if it cannot be determined
92 ******************************************************************/
93 static int TimeZone(time_t t)
95 struct tm *tm = gmtime(&t);
103 return tm_diff(&tm_utc,tm);
107 static BOOL done_serverzone_init;
109 /* Return the smb serverzone value */
111 static int get_serverzone(void)
113 static int serverzone;
115 if (!done_serverzone_init) {
116 serverzone = TimeZone(time(NULL));
118 if ((serverzone % 60) != 0) {
119 DEBUG(1,("WARNING: Your timezone is not a multiple of 1 minute.\n"));
122 DEBUG(4,("Serverzone is %d\n",serverzone));
124 done_serverzone_init = True;
130 /* Re-read the smb serverzone value */
132 static struct timeval start_time_hires;
136 done_serverzone_init = False;
138 /* Save the start time of this process. */
139 if (start_time_hires.tv_sec == 0 && start_time_hires.tv_usec == 0)
140 GetTimeOfDay(&start_time_hires);
143 /**********************************************************************
144 Return a timeval struct of the uptime of this process. As TimeInit is
145 done before a daemon fork then this is the start time from the parent
147 ***********************************************************************/
149 void get_process_uptime(struct timeval *ret_time)
151 struct timeval time_now_hires;
153 GetTimeOfDay(&time_now_hires);
154 ret_time->tv_sec = time_now_hires.tv_sec - start_time_hires.tv_sec;
155 ret_time->tv_usec = time_now_hires.tv_usec - start_time_hires.tv_usec;
156 if (time_now_hires.tv_usec < start_time_hires.tv_usec) {
157 ret_time->tv_sec -= 1;
158 ret_time->tv_usec = 1000000 + (time_now_hires.tv_usec - start_time_hires.tv_usec);
160 ret_time->tv_usec = time_now_hires.tv_usec - start_time_hires.tv_usec;
163 /*******************************************************************
164 return the same value as TimeZone, but it should be more efficient.
166 We keep a table of DST offsets to prevent calling localtime() on each
167 call of this function. This saves a LOT of time on many unixes.
169 Updated by Paul Eggert <eggert@twinsun.com>
170 ********************************************************************/
171 static int TimeZoneFaster(time_t t)
173 static struct dst_table {time_t start,end; int zone;} *tdt, *dst_table = NULL;
174 static int table_size = 0;
178 if (t == 0) t = time(NULL);
180 /* Tunis has a 8 day DST region, we need to be careful ... */
181 #define MAX_DST_WIDTH (365*24*60*60)
182 #define MAX_DST_SKIP (7*24*60*60)
184 for (i=0;i<table_size;i++)
185 if (t >= dst_table[i].start && t <= dst_table[i].end) break;
188 zone = dst_table[i].zone;
193 tdt = SMB_REALLOC_ARRAY(dst_table, struct dst_table, i+1);
195 DEBUG(0,("TimeZoneFaster: out of memory!\n"));
196 SAFE_FREE(dst_table);
202 dst_table[i].zone = zone;
203 dst_table[i].start = dst_table[i].end = t;
205 /* no entry will cover more than 6 months */
206 low = t - MAX_DST_WIDTH/2;
210 high = t + MAX_DST_WIDTH/2;
214 /* widen the new entry using two bisection searches */
215 while (low+60*60 < dst_table[i].start) {
216 if (dst_table[i].start - low > MAX_DST_SKIP*2)
217 t = dst_table[i].start - MAX_DST_SKIP;
219 t = low + (dst_table[i].start-low)/2;
220 if (TimeZone(t) == zone)
221 dst_table[i].start = t;
226 while (high-60*60 > dst_table[i].end) {
227 if (high - dst_table[i].end > MAX_DST_SKIP*2)
228 t = dst_table[i].end + MAX_DST_SKIP;
230 t = high - (high-dst_table[i].end)/2;
231 if (TimeZone(t) == zone)
232 dst_table[i].end = t;
237 DEBUG(1,("Added DST entry from %s ",
238 asctime(localtime(&dst_table[i].start))));
239 DEBUG(1,("to %s (%d)\n",asctime(localtime(&dst_table[i].end)),
247 /****************************************************************************
248 return the UTC offset in seconds west of UTC, adjusted for extra time offset
249 **************************************************************************/
250 int TimeDiff(time_t t)
252 return TimeZoneFaster(t) + 60*extra_time_offset;
256 /****************************************************************************
257 return the UTC offset in seconds west of UTC, adjusted for extra time
258 offset, for a local time value. If ut = lt + LocTimeDiff(lt), then
259 lt = ut - TimeDiff(ut), but the converse does not necessarily hold near
260 daylight savings transitions because some local times are ambiguous.
261 LocTimeDiff(t) equals TimeDiff(t) except near daylight savings transitions.
262 +**************************************************************************/
263 static int LocTimeDiff(time_t lte)
265 time_t lt = lte - 60*extra_time_offset;
266 int d = TimeZoneFaster(lt);
269 /* if overflow occurred, ignore all the adjustments so far */
270 if (((lte < lt) ^ (extra_time_offset < 0)) | ((t < lt) ^ (d < 0)))
273 /* now t should be close enough to the true UTC to yield the right answer */
278 /****************************************************************************
279 try to optimise the localtime call, it can be quite expensive on some machines
280 ****************************************************************************/
281 struct tm *LocalTime(time_t *t)
290 #define TIME_FIXUP_CONSTANT (369.0*365.25*24*60*60-(3.0*24*60*60+6.0*60*60))
292 /****************************************************************************
293 interpret an 8 byte "filetime" structure to a time_t
294 It's originally in "100ns units since jan 1st 1601"
296 It appears to be kludge-GMT (at least for file listings). This means
297 its the GMT you get by taking a localtime and adding the
298 serverzone. This is NOT the same as GMT in some cases. This routine
299 converts this to real GMT.
300 ****************************************************************************/
301 time_t nt_time_to_unix(NTTIME *nt)
305 /* The next two lines are a fix needed for the
306 broken SCO compiler. JRA. */
307 time_t l_time_min = TIME_T_MIN;
308 time_t l_time_max = TIME_T_MAX;
310 if (nt->high == 0 || (nt->high == 0xffffffff && nt->low == 0xffffffff))
313 d = ((double)nt->high)*4.0*(double)(1<<30);
314 d += (nt->low&0xFFF00000);
317 /* now adjust by 369 years to make the secs since 1970 */
318 d -= TIME_FIXUP_CONSTANT;
326 ret = (time_t)(d+0.5);
328 /* this takes us from kludge-GMT to real GMT */
329 ret -= get_serverzone();
330 ret += LocTimeDiff(ret);
335 /****************************************************************************
336 Convert a NTTIME structure to a time_t.
337 It's originally in "100ns units".
339 This is an absolute version of the one above.
340 By absolute I mean, it doesn't adjust from 1/1/1601 to 1/1/1970
341 if the NTTIME was 5 seconds, the time_t is 5 seconds. JFM
342 ****************************************************************************/
344 time_t nt_time_to_unix_abs(NTTIME *nt)
348 /* The next two lines are a fix needed for the
349 broken SCO compiler. JRA. */
350 time_t l_time_min = TIME_T_MIN;
351 time_t l_time_max = TIME_T_MAX;
356 if (nt->high==0x80000000 && nt->low==0)
359 /* reverse the time */
360 /* it's a negative value, turn it to positive */
364 d = ((double)nt->high)*4.0*(double)(1<<30);
365 d += (nt->low&0xFFF00000);
368 if (!(l_time_min <= d && d <= l_time_max))
371 ret = (time_t)(d+0.5);
376 /****************************************************************************
377 interprets an nt time into a unix time_t
378 ****************************************************************************/
379 time_t interpret_long_date(char *p)
384 return nt_time_to_unix(&nt);
387 /****************************************************************************
388 put a 8 byte filetime from a time_t
389 This takes real GMT as input and converts to kludge-GMT
390 ****************************************************************************/
391 void unix_to_nt_time(NTTIME *nt, time_t t)
403 nt->low = 0xffffffff;
404 nt->high = 0x7fffffff;
409 nt->low = 0xffffffff;
410 nt->high = 0xffffffff;
414 /* this converts GMT to kludge-GMT */
415 t -= TimeDiff(t) - get_serverzone();
418 d += TIME_FIXUP_CONSTANT;
421 nt->high = (uint32)(d * (1.0/(4.0*(double)(1<<30))));
422 nt->low = (uint32)(d - ((double)nt->high)*4.0*(double)(1<<30));
425 /****************************************************************************
426 Convert a time_t to a NTTIME structure
428 This is an absolute version of the one above.
429 By absolute I mean, it doesn't adjust from 1/1/1970 to 1/1/1601
430 If the nttime_t was 5 seconds, the NTTIME is 5 seconds. JFM
431 ****************************************************************************/
433 void unix_to_nt_time_abs(NTTIME *nt, time_t t)
443 if (t == TIME_T_MAX) {
444 nt->low = 0xffffffff;
445 nt->high = 0x7fffffff;
450 /* that's what NT uses for infinite */
452 nt->high = 0x80000000;
459 nt->high = (uint32)(d * (1.0/(4.0*(double)(1<<30))));
460 nt->low = (uint32)(d - ((double)nt->high)*4.0*(double)(1<<30));
462 /* convert to a negative value */
467 /****************************************************************************
468 take a Unix time and convert to an NTTIME structure and place in buffer
470 ****************************************************************************/
471 void put_long_date(char *p,time_t t)
474 unix_to_nt_time(&nt, t);
476 SIVAL(p, 4, nt.high);
479 /****************************************************************************
480 check if it's a null mtime
481 ****************************************************************************/
482 BOOL null_mtime(time_t mtime)
484 if (mtime == 0 || mtime == (time_t)0xFFFFFFFF || mtime == (time_t)-1)
489 /*******************************************************************
490 create a 16 bit dos packed date
491 ********************************************************************/
492 static uint16 make_dos_date1(struct tm *t)
495 ret = (((unsigned)(t->tm_mon+1)) >> 3) | ((t->tm_year-80) << 1);
496 ret = ((ret&0xFF)<<8) | (t->tm_mday | (((t->tm_mon+1) & 0x7) << 5));
500 /*******************************************************************
501 create a 16 bit dos packed time
502 ********************************************************************/
503 static uint16 make_dos_time1(struct tm *t)
506 ret = ((((unsigned)t->tm_min >> 3)&0x7) | (((unsigned)t->tm_hour) << 3));
507 ret = ((ret&0xFF)<<8) | ((t->tm_sec/2) | ((t->tm_min & 0x7) << 5));
511 /*******************************************************************
512 create a 32 bit dos packed date/time from some parameters
513 This takes a GMT time and returns a packed localtime structure
514 ********************************************************************/
515 static uint32 make_dos_date(time_t unixdate)
520 t = LocalTime(&unixdate);
524 ret = make_dos_date1(t);
525 ret = ((ret&0xFFFF)<<16) | make_dos_time1(t);
530 /*******************************************************************
531 put a dos date into a buffer (time/date format)
532 This takes GMT time and puts local time in the buffer
533 ********************************************************************/
534 void put_dos_date(char *buf,int offset,time_t unixdate)
536 uint32 x = make_dos_date(unixdate);
540 /*******************************************************************
541 put a dos date into a buffer (date/time format)
542 This takes GMT time and puts local time in the buffer
543 ********************************************************************/
544 void put_dos_date2(char *buf,int offset,time_t unixdate)
546 uint32 x = make_dos_date(unixdate);
547 x = ((x&0xFFFF)<<16) | ((x&0xFFFF0000)>>16);
551 /*******************************************************************
552 put a dos 32 bit "unix like" date into a buffer. This routine takes
553 GMT and converts it to LOCAL time before putting it (most SMBs assume
554 localtime for this sort of date)
555 ********************************************************************/
556 void put_dos_date3(char *buf,int offset,time_t unixdate)
558 if (!null_mtime(unixdate))
559 unixdate -= TimeDiff(unixdate);
560 SIVAL(buf,offset,unixdate);
563 /*******************************************************************
564 interpret a 32 bit dos packed date/time to some parameters
565 ********************************************************************/
566 static void interpret_dos_date(uint32 date,int *year,int *month,int *day,int *hour,int *minute,int *second)
570 p0=date&0xFF; p1=((date&0xFF00)>>8)&0xFF;
571 p2=((date&0xFF0000)>>16)&0xFF; p3=((date&0xFF000000)>>24)&0xFF;
573 *second = 2*(p0 & 0x1F);
574 *minute = ((p0>>5)&0xFF) + ((p1&0x7)<<3);
575 *hour = (p1>>3)&0xFF;
577 *month = ((p2>>5)&0xFF) + ((p3&0x1)<<3) - 1;
578 *year = ((p3>>1)&0xFF) + 80;
581 /*******************************************************************
582 create a unix date (int GMT) from a dos date (which is actually in
584 ********************************************************************/
585 time_t make_unix_date(void *date_ptr)
591 dos_date = IVAL(date_ptr,0);
593 if (dos_date == 0) return(0);
595 interpret_dos_date(dos_date,&t.tm_year,&t.tm_mon,
596 &t.tm_mday,&t.tm_hour,&t.tm_min,&t.tm_sec);
599 /* mktime() also does the local to GMT time conversion for us */
605 /*******************************************************************
606 like make_unix_date() but the words are reversed
607 ********************************************************************/
608 time_t make_unix_date2(void *date_ptr)
612 x = IVAL(date_ptr,0);
613 x2 = ((x&0xFFFF)<<16) | ((x&0xFFFF0000)>>16);
616 return(make_unix_date((void *)&x));
619 /*******************************************************************
620 create a unix GMT date from a dos date in 32 bit "unix like" format
621 these generally arrive as localtimes, with corresponding DST
622 ******************************************************************/
623 time_t make_unix_date3(void *date_ptr)
625 time_t t = (time_t)IVAL(date_ptr,0);
632 /***************************************************************************
633 return a HTTP/1.0 time string
634 ***************************************************************************/
635 char *http_timestring(time_t t)
638 struct tm *tm = LocalTime(&t);
641 slprintf(buf,sizeof(buf)-1,"%ld seconds since the Epoch",(long)t);
643 #ifndef HAVE_STRFTIME
644 fstrcpy(buf, asctime(tm));
645 if(buf[strlen(buf)-1] == '\n')
646 buf[strlen(buf)-1] = 0;
647 #else /* !HAVE_STRFTIME */
648 strftime(buf, sizeof(buf)-1, "%a, %d %b %Y %H:%M:%S %Z", tm);
649 #endif /* !HAVE_STRFTIME */
655 /****************************************************************************
656 Return the date and time as a string
657 ****************************************************************************/
659 char *timestring(BOOL hires)
661 static fstring TimeBuf;
668 t = (time_t)tp.tv_sec;
677 "%ld.%06ld seconds since the Epoch",
683 "%ld seconds since the Epoch",
689 strftime(TimeBuf,sizeof(TimeBuf)-1,"%Y/%m/%d %H:%M:%S",tm);
690 slprintf(TimeBuf+strlen(TimeBuf),
691 sizeof(TimeBuf)-1 - strlen(TimeBuf),
695 strftime(TimeBuf,sizeof(TimeBuf)-1,"%Y/%m/%d %H:%M:%S",tm);
705 fstrcpy(TimeBuf, asctime(tm));
712 /****************************************************************************
713 return the best approximation to a 'create time' under UNIX from a stat
715 ****************************************************************************/
717 time_t get_create_time(SMB_STRUCT_STAT *st,BOOL fake_dirs)
721 if(S_ISDIR(st->st_mode) && fake_dirs)
722 return (time_t)315493200L; /* 1/1/1980 */
724 ret = MIN(st->st_ctime, st->st_mtime);
725 ret1 = MIN(ret, st->st_atime);
727 if(ret1 != (time_t)0)
731 * One of ctime, mtime or atime was zero (probably atime).
732 * Just return MIN(ctime, mtime).
737 /****************************************************************************
738 initialise an NTTIME to -1, which means "unknown" or "don't expire"
739 ****************************************************************************/
741 void init_nt_time(NTTIME *nt)
743 nt->high = 0x7FFFFFFF;
744 nt->low = 0xFFFFFFFF;
747 /****************************************************************************
749 ****************************************************************************/
750 BOOL nt_time_is_zero(NTTIME *nt)
757 SMB_BIG_INT usec_time_diff(struct timeval *larget, struct timeval *smallt)
759 SMB_BIG_INT sec_diff = larget->tv_sec - smallt->tv_sec;
760 return (sec_diff * 1000000) + (SMB_BIG_INT)(larget->tv_usec - smallt->tv_usec);