2 Unix SMB/CIFS implementation.
3 time handling functions
4 Copyright (C) Andrew Tridgell 1992-1998
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 /*******************************************************************
44 External access to time_t_min and time_t_max.
45 ********************************************************************/
47 time_t get_time_t_min(void)
52 time_t get_time_t_max(void)
57 /*******************************************************************
58 a gettimeofday wrapper
59 ********************************************************************/
60 void GetTimeOfDay(struct timeval *tval)
62 #ifdef HAVE_GETTIMEOFDAY_TZ
63 gettimeofday(tval,NULL);
69 #define TM_YEAR_BASE 1900
71 /*******************************************************************
72 yield the difference between *A and *B, in seconds, ignoring leap seconds
73 ********************************************************************/
74 static int tm_diff(struct tm *a, struct tm *b)
76 int ay = a->tm_year + (TM_YEAR_BASE - 1);
77 int by = b->tm_year + (TM_YEAR_BASE - 1);
78 int intervening_leap_days =
79 (ay/4 - by/4) - (ay/100 - by/100) + (ay/400 - by/400);
81 int days = 365*years + intervening_leap_days + (a->tm_yday - b->tm_yday);
82 int hours = 24*days + (a->tm_hour - b->tm_hour);
83 int minutes = 60*hours + (a->tm_min - b->tm_min);
84 int seconds = 60*minutes + (a->tm_sec - b->tm_sec);
89 /*******************************************************************
90 return the UTC offset in seconds west of UTC, or 0 if it cannot be determined
91 ******************************************************************/
92 static int TimeZone(time_t t)
94 struct tm *tm = gmtime(&t);
102 return tm_diff(&tm_utc,tm);
106 static BOOL done_serverzone_init;
108 /* Return the smb serverzone value */
110 static int get_serverzone(void)
112 static int serverzone;
114 if (!done_serverzone_init) {
115 serverzone = TimeZone(time(NULL));
117 if ((serverzone % 60) != 0) {
118 DEBUG(1,("WARNING: Your timezone is not a multiple of 1 minute.\n"));
121 DEBUG(4,("Serverzone is %d\n",serverzone));
123 done_serverzone_init = True;
129 /* Re-read the smb serverzone value */
131 static struct timeval start_time_hires;
135 done_serverzone_init = False;
137 /* Save the start time of this process. */
138 if (start_time_hires.tv_sec == 0 && start_time_hires.tv_usec == 0)
139 GetTimeOfDay(&start_time_hires);
142 /**********************************************************************
143 Return a timeval struct of the uptime of this process. As TimeInit is
144 done before a daemon fork then this is the start time from the parent
146 ***********************************************************************/
148 void get_process_uptime(struct timeval *ret_time)
150 struct timeval time_now_hires;
152 GetTimeOfDay(&time_now_hires);
153 ret_time->tv_sec = time_now_hires.tv_sec - start_time_hires.tv_sec;
154 ret_time->tv_usec = time_now_hires.tv_usec - start_time_hires.tv_usec;
155 if (time_now_hires.tv_usec < start_time_hires.tv_usec) {
156 ret_time->tv_sec -= 1;
157 ret_time->tv_usec = 1000000 + (time_now_hires.tv_usec - start_time_hires.tv_usec);
159 ret_time->tv_usec = time_now_hires.tv_usec - start_time_hires.tv_usec;
162 /*******************************************************************
163 return the same value as TimeZone, but it should be more efficient.
165 We keep a table of DST offsets to prevent calling localtime() on each
166 call of this function. This saves a LOT of time on many unixes.
168 Updated by Paul Eggert <eggert@twinsun.com>
169 ********************************************************************/
170 static int TimeZoneFaster(time_t t)
172 static struct dst_table {time_t start,end; int zone;} *tdt, *dst_table = NULL;
173 static int table_size = 0;
177 if (t == 0) t = time(NULL);
179 /* Tunis has a 8 day DST region, we need to be careful ... */
180 #define MAX_DST_WIDTH (365*24*60*60)
181 #define MAX_DST_SKIP (7*24*60*60)
183 for (i=0;i<table_size;i++)
184 if (t >= dst_table[i].start && t <= dst_table[i].end) break;
187 zone = dst_table[i].zone;
192 tdt = (struct dst_table *)Realloc(dst_table,
193 sizeof(dst_table[0])*(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) return(0);
312 d = ((double)nt->high)*4.0*(double)(1<<30);
313 d += (nt->low&0xFFF00000);
316 /* now adjust by 369 years to make the secs since 1970 */
317 d -= TIME_FIXUP_CONSTANT;
319 if (!(l_time_min <= d && d <= l_time_max))
322 ret = (time_t)(d+0.5);
324 /* this takes us from kludge-GMT to real GMT */
325 ret -= get_serverzone();
326 ret += LocTimeDiff(ret);
331 /****************************************************************************
332 convert a NTTIME structure to a time_t
333 It's originally in "100ns units"
335 this is an absolute version of the one above.
336 By absolute I mean, it doesn't adjust from 1/1/1601 to 1/1/1970
337 if the NTTIME was 5 seconds, the time_t is 5 seconds. JFM
338 ****************************************************************************/
339 time_t nt_time_to_unix_abs(NTTIME *nt)
343 /* The next two lines are a fix needed for the
344 broken SCO compiler. JRA. */
345 time_t l_time_min = TIME_T_MIN;
346 time_t l_time_max = TIME_T_MAX;
351 if (nt->high==0x80000000 && nt->low==0)
354 /* reverse the time */
355 /* it's a negative value, turn it to positive */
359 d = ((double)nt->high)*4.0*(double)(1<<30);
360 d += (nt->low&0xFFF00000);
363 if (!(l_time_min <= d && d <= l_time_max))
366 ret = (time_t)(d+0.5);
368 /* this takes us from kludge-GMT to real GMT */
369 ret -= get_serverzone();
370 ret += LocTimeDiff(ret);
377 /****************************************************************************
378 interprets an nt time into a unix time_t
379 ****************************************************************************/
380 time_t interpret_long_date(char *p)
385 return nt_time_to_unix(&nt);
388 /****************************************************************************
389 put a 8 byte filetime from a time_t
390 This takes real GMT as input and converts to kludge-GMT
391 ****************************************************************************/
392 void unix_to_nt_time(NTTIME *nt, time_t t)
404 nt->low = 0xffffffff;
405 nt->high = 0x7fffffff;
410 nt->low = 0xffffffff;
411 nt->high = 0xffffffff;
415 /* this converts GMT to kludge-GMT */
416 t -= LocTimeDiff(t) - get_serverzone();
419 d += TIME_FIXUP_CONSTANT;
422 nt->high = (uint32)(d * (1.0/(4.0*(double)(1<<30))));
423 nt->low = (uint32)(d - ((double)nt->high)*4.0*(double)(1<<30));
426 /****************************************************************************
427 convert a time_t to a NTTIME structure
429 this is an absolute version of the one above.
430 By absolute I mean, it doesn't adjust from 1/1/1970 to 1/1/1601
431 if the nttime_t was 5 seconds, the NTTIME is 5 seconds. JFM
432 ****************************************************************************/
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;
456 /* this converts GMT to kludge-GMT */
457 t -= LocTimeDiff(t) - get_serverzone();
462 nt->high = (uint32)(d * (1.0/(4.0*(double)(1<<30))));
463 nt->low = (uint32)(d - ((double)nt->high)*4.0*(double)(1<<30));
465 /* convert to a negative value */
471 /****************************************************************************
472 take an NTTIME structure, containing high / low time. convert to unix time.
473 lkclXXXX this may need 2 SIVALs not a memcpy. we'll see...
474 ****************************************************************************/
475 void put_long_date(char *p,time_t t)
478 unix_to_nt_time(&nt, t);
480 SIVAL(p, 4, nt.high);
483 /****************************************************************************
484 check if it's a null mtime
485 ****************************************************************************/
486 BOOL null_mtime(time_t mtime)
488 if (mtime == 0 || mtime == 0xFFFFFFFF || mtime == (time_t)-1)
493 /*******************************************************************
494 create a 16 bit dos packed date
495 ********************************************************************/
496 static uint16 make_dos_date1(struct tm *t)
499 ret = (((unsigned)(t->tm_mon+1)) >> 3) | ((t->tm_year-80) << 1);
500 ret = ((ret&0xFF)<<8) | (t->tm_mday | (((t->tm_mon+1) & 0x7) << 5));
504 /*******************************************************************
505 create a 16 bit dos packed time
506 ********************************************************************/
507 static uint16 make_dos_time1(struct tm *t)
510 ret = ((((unsigned)t->tm_min >> 3)&0x7) | (((unsigned)t->tm_hour) << 3));
511 ret = ((ret&0xFF)<<8) | ((t->tm_sec/2) | ((t->tm_min & 0x7) << 5));
515 /*******************************************************************
516 create a 32 bit dos packed date/time from some parameters
517 This takes a GMT time and returns a packed localtime structure
518 ********************************************************************/
519 static uint32 make_dos_date(time_t unixdate)
524 t = LocalTime(&unixdate);
528 ret = make_dos_date1(t);
529 ret = ((ret&0xFFFF)<<16) | make_dos_time1(t);
534 /*******************************************************************
535 put a dos date into a buffer (time/date format)
536 This takes GMT time and puts local time in the buffer
537 ********************************************************************/
538 void put_dos_date(char *buf,int offset,time_t unixdate)
540 uint32 x = make_dos_date(unixdate);
544 /*******************************************************************
545 put a dos date into a buffer (date/time format)
546 This takes GMT time and puts local time in the buffer
547 ********************************************************************/
548 void put_dos_date2(char *buf,int offset,time_t unixdate)
550 uint32 x = make_dos_date(unixdate);
551 x = ((x&0xFFFF)<<16) | ((x&0xFFFF0000)>>16);
555 /*******************************************************************
556 put a dos 32 bit "unix like" date into a buffer. This routine takes
557 GMT and converts it to LOCAL time before putting it (most SMBs assume
558 localtime for this sort of date)
559 ********************************************************************/
560 void put_dos_date3(char *buf,int offset,time_t unixdate)
562 if (!null_mtime(unixdate))
563 unixdate -= TimeDiff(unixdate);
564 SIVAL(buf,offset,unixdate);
567 /*******************************************************************
568 interpret a 32 bit dos packed date/time to some parameters
569 ********************************************************************/
570 static void interpret_dos_date(uint32 date,int *year,int *month,int *day,int *hour,int *minute,int *second)
574 p0=date&0xFF; p1=((date&0xFF00)>>8)&0xFF;
575 p2=((date&0xFF0000)>>16)&0xFF; p3=((date&0xFF000000)>>24)&0xFF;
577 *second = 2*(p0 & 0x1F);
578 *minute = ((p0>>5)&0xFF) + ((p1&0x7)<<3);
579 *hour = (p1>>3)&0xFF;
581 *month = ((p2>>5)&0xFF) + ((p3&0x1)<<3) - 1;
582 *year = ((p3>>1)&0xFF) + 80;
585 /*******************************************************************
586 create a unix date (int GMT) from a dos date (which is actually in
588 ********************************************************************/
589 time_t make_unix_date(void *date_ptr)
595 dos_date = IVAL(date_ptr,0);
597 if (dos_date == 0) return(0);
599 interpret_dos_date(dos_date,&t.tm_year,&t.tm_mon,
600 &t.tm_mday,&t.tm_hour,&t.tm_min,&t.tm_sec);
603 /* mktime() also does the local to GMT time conversion for us */
609 /*******************************************************************
610 like make_unix_date() but the words are reversed
611 ********************************************************************/
612 time_t make_unix_date2(void *date_ptr)
616 x = IVAL(date_ptr,0);
617 x2 = ((x&0xFFFF)<<16) | ((x&0xFFFF0000)>>16);
620 return(make_unix_date((void *)&x));
623 /*******************************************************************
624 create a unix GMT date from a dos date in 32 bit "unix like" format
625 these generally arrive as localtimes, with corresponding DST
626 ******************************************************************/
627 time_t make_unix_date3(void *date_ptr)
629 time_t t = (time_t)IVAL(date_ptr,0);
636 /***************************************************************************
637 return a HTTP/1.0 time string
638 ***************************************************************************/
639 char *http_timestring(time_t t)
642 struct tm *tm = LocalTime(&t);
645 slprintf(buf,sizeof(buf)-1,"%ld seconds since the Epoch",(long)t);
647 #ifndef HAVE_STRFTIME
648 fstrcpy(buf, asctime(tm));
649 if(buf[strlen(buf)-1] == '\n')
650 buf[strlen(buf)-1] = 0;
651 #else /* !HAVE_STRFTIME */
652 strftime(buf, sizeof(buf)-1, "%a, %d %b %Y %H:%M:%S %Z", tm);
653 #endif /* !HAVE_STRFTIME */
659 /****************************************************************************
660 Return the date and time as a string
661 ****************************************************************************/
663 char *timestring(BOOL hires)
665 static fstring TimeBuf;
672 t = (time_t)tp.tv_sec;
681 "%ld.%06ld seconds since the Epoch",
687 "%ld seconds since the Epoch",
693 strftime(TimeBuf,sizeof(TimeBuf)-1,"%Y/%m/%d %H:%M:%S",tm);
694 slprintf(TimeBuf+strlen(TimeBuf),
695 sizeof(TimeBuf)-1 - strlen(TimeBuf),
699 strftime(TimeBuf,100,"%Y/%m/%d %H:%M:%S",tm);
709 fstrcpy(TimeBuf, asctime(tm));
716 /****************************************************************************
717 return the best approximation to a 'create time' under UNIX from a stat
719 ****************************************************************************/
721 time_t get_create_time(SMB_STRUCT_STAT *st,BOOL fake_dirs)
725 if(S_ISDIR(st->st_mode) && fake_dirs)
726 return (time_t)315493200L; /* 1/1/1980 */
728 ret = MIN(st->st_ctime, st->st_mtime);
729 ret1 = MIN(ret, st->st_atime);
731 if(ret1 != (time_t)0)
735 * One of ctime, mtime or atime was zero (probably atime).
736 * Just return MIN(ctime, mtime).
741 /****************************************************************************
742 initialise an NTTIME to -1, which means "unknown" or "don't expire"
743 ****************************************************************************/
745 void init_nt_time(NTTIME *nt)
747 nt->high = 0x7FFFFFFF;
748 nt->low = 0xFFFFFFFF;