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_max(void)
52 /*******************************************************************
53 a gettimeofday wrapper
54 ********************************************************************/
55 void GetTimeOfDay(struct timeval *tval)
57 #ifdef HAVE_GETTIMEOFDAY_TZ
58 gettimeofday(tval,NULL);
64 #define TM_YEAR_BASE 1900
66 /*******************************************************************
67 yield the difference between *A and *B, in seconds, ignoring leap seconds
68 ********************************************************************/
69 static int tm_diff(struct tm *a, struct tm *b)
71 int ay = a->tm_year + (TM_YEAR_BASE - 1);
72 int by = b->tm_year + (TM_YEAR_BASE - 1);
73 int intervening_leap_days =
74 (ay/4 - by/4) - (ay/100 - by/100) + (ay/400 - by/400);
76 int days = 365*years + intervening_leap_days + (a->tm_yday - b->tm_yday);
77 int hours = 24*days + (a->tm_hour - b->tm_hour);
78 int minutes = 60*hours + (a->tm_min - b->tm_min);
79 int seconds = 60*minutes + (a->tm_sec - b->tm_sec);
84 /*******************************************************************
85 return the UTC offset in seconds west of UTC, or 0 if it cannot be determined
86 ******************************************************************/
87 static int TimeZone(time_t t)
89 struct tm *tm = gmtime(&t);
97 return tm_diff(&tm_utc,tm);
101 static BOOL done_serverzone_init;
103 /* Return the smb serverzone value */
105 static int get_serverzone(void)
107 static int serverzone;
109 if (!done_serverzone_init) {
110 serverzone = TimeZone(time(NULL));
112 if ((serverzone % 60) != 0) {
113 DEBUG(1,("WARNING: Your timezone is not a multiple of 1 minute.\n"));
116 DEBUG(4,("Serverzone is %d\n",serverzone));
118 done_serverzone_init = True;
124 /* Re-read the smb serverzone value */
126 static struct timeval start_time_hires;
130 done_serverzone_init = False;
132 /* Save the start time of this process. */
133 if (start_time_hires.tv_sec == 0 && start_time_hires.tv_usec == 0)
134 GetTimeOfDay(&start_time_hires);
137 /**********************************************************************
138 Return a timeval struct of the uptime of this process. As TimeInit is
139 done before a daemon fork then this is the start time from the parent
141 ***********************************************************************/
143 void get_process_uptime(struct timeval *ret_time)
145 struct timeval time_now_hires;
147 GetTimeOfDay(&time_now_hires);
148 ret_time->tv_sec = time_now_hires.tv_sec - start_time_hires.tv_sec;
149 ret_time->tv_usec = time_now_hires.tv_usec - start_time_hires.tv_usec;
150 if (time_now_hires.tv_usec < start_time_hires.tv_usec) {
151 ret_time->tv_sec -= 1;
152 ret_time->tv_usec = 1000000 + (time_now_hires.tv_usec - start_time_hires.tv_usec);
154 ret_time->tv_usec = time_now_hires.tv_usec - start_time_hires.tv_usec;
157 /*******************************************************************
158 return the same value as TimeZone, but it should be more efficient.
160 We keep a table of DST offsets to prevent calling localtime() on each
161 call of this function. This saves a LOT of time on many unixes.
163 Updated by Paul Eggert <eggert@twinsun.com>
164 ********************************************************************/
165 static int TimeZoneFaster(time_t t)
167 static struct dst_table {time_t start,end; int zone;} *tdt, *dst_table = NULL;
168 static int table_size = 0;
172 if (t == 0) t = time(NULL);
174 /* Tunis has a 8 day DST region, we need to be careful ... */
175 #define MAX_DST_WIDTH (365*24*60*60)
176 #define MAX_DST_SKIP (7*24*60*60)
178 for (i=0;i<table_size;i++)
179 if (t >= dst_table[i].start && t <= dst_table[i].end) break;
182 zone = dst_table[i].zone;
187 tdt = (struct dst_table *)Realloc(dst_table,
188 sizeof(dst_table[0])*(i+1));
190 DEBUG(0,("TimeZoneFaster: out of memory!\n"));
191 SAFE_FREE(dst_table);
197 dst_table[i].zone = zone;
198 dst_table[i].start = dst_table[i].end = t;
200 /* no entry will cover more than 6 months */
201 low = t - MAX_DST_WIDTH/2;
205 high = t + MAX_DST_WIDTH/2;
209 /* widen the new entry using two bisection searches */
210 while (low+60*60 < dst_table[i].start) {
211 if (dst_table[i].start - low > MAX_DST_SKIP*2)
212 t = dst_table[i].start - MAX_DST_SKIP;
214 t = low + (dst_table[i].start-low)/2;
215 if (TimeZone(t) == zone)
216 dst_table[i].start = t;
221 while (high-60*60 > dst_table[i].end) {
222 if (high - dst_table[i].end > MAX_DST_SKIP*2)
223 t = dst_table[i].end + MAX_DST_SKIP;
225 t = high - (high-dst_table[i].end)/2;
226 if (TimeZone(t) == zone)
227 dst_table[i].end = t;
232 DEBUG(1,("Added DST entry from %s ",
233 asctime(localtime(&dst_table[i].start))));
234 DEBUG(1,("to %s (%d)\n",asctime(localtime(&dst_table[i].end)),
242 /****************************************************************************
243 return the UTC offset in seconds west of UTC, adjusted for extra time offset
244 **************************************************************************/
245 int TimeDiff(time_t t)
247 return TimeZoneFaster(t) + 60*extra_time_offset;
251 /****************************************************************************
252 return the UTC offset in seconds west of UTC, adjusted for extra time
253 offset, for a local time value. If ut = lt + LocTimeDiff(lt), then
254 lt = ut - TimeDiff(ut), but the converse does not necessarily hold near
255 daylight savings transitions because some local times are ambiguous.
256 LocTimeDiff(t) equals TimeDiff(t) except near daylight savings transitions.
257 +**************************************************************************/
258 static int LocTimeDiff(time_t lte)
260 time_t lt = lte - 60*extra_time_offset;
261 int d = TimeZoneFaster(lt);
264 /* if overflow occurred, ignore all the adjustments so far */
265 if (((lte < lt) ^ (extra_time_offset < 0)) | ((t < lt) ^ (d < 0)))
268 /* now t should be close enough to the true UTC to yield the right answer */
273 /****************************************************************************
274 try to optimise the localtime call, it can be quite expensive on some machines
275 ****************************************************************************/
276 struct tm *LocalTime(time_t *t)
285 #define TIME_FIXUP_CONSTANT (369.0*365.25*24*60*60-(3.0*24*60*60+6.0*60*60))
287 /****************************************************************************
288 interpret an 8 byte "filetime" structure to a time_t
289 It's originally in "100ns units since jan 1st 1601"
291 It appears to be kludge-GMT (at least for file listings). This means
292 its the GMT you get by taking a localtime and adding the
293 serverzone. This is NOT the same as GMT in some cases. This routine
294 converts this to real GMT.
295 ****************************************************************************/
296 time_t nt_time_to_unix(NTTIME *nt)
300 /* The next two lines are a fix needed for the
301 broken SCO compiler. JRA. */
302 time_t l_time_min = TIME_T_MIN;
303 time_t l_time_max = TIME_T_MAX;
305 if (nt->high == 0) return(0);
307 d = ((double)nt->high)*4.0*(double)(1<<30);
308 d += (nt->low&0xFFF00000);
311 /* now adjust by 369 years to make the secs since 1970 */
312 d -= TIME_FIXUP_CONSTANT;
314 if (!(l_time_min <= d && d <= l_time_max))
317 ret = (time_t)(d+0.5);
319 /* this takes us from kludge-GMT to real GMT */
320 ret -= get_serverzone();
321 ret += LocTimeDiff(ret);
326 /****************************************************************************
327 convert a NTTIME structure to a time_t
328 It's originally in "100ns units"
330 this is an absolute version of the one above.
331 By absolute I mean, it doesn't adjust from 1/1/1601 to 1/1/1970
332 if the NTTIME was 5 seconds, the time_t is 5 seconds. JFM
333 ****************************************************************************/
334 time_t nt_time_to_unix_abs(NTTIME *nt)
338 /* The next two lines are a fix needed for the
339 broken SCO compiler. JRA. */
340 time_t l_time_min = TIME_T_MIN;
341 time_t l_time_max = TIME_T_MAX;
346 if (nt->high==0x80000000 && nt->low==0)
349 /* reverse the time */
350 /* it's a negative value, turn it to positive */
354 d = ((double)nt->high)*4.0*(double)(1<<30);
355 d += (nt->low&0xFFF00000);
358 if (!(l_time_min <= d && d <= l_time_max))
361 ret = (time_t)(d+0.5);
363 /* this takes us from kludge-GMT to real GMT */
364 ret -= get_serverzone();
365 ret += LocTimeDiff(ret);
372 /****************************************************************************
373 interprets an nt time into a unix time_t
374 ****************************************************************************/
375 time_t interpret_long_date(char *p)
380 return nt_time_to_unix(&nt);
383 /****************************************************************************
384 put a 8 byte filetime from a time_t
385 This takes real GMT as input and converts to kludge-GMT
386 ****************************************************************************/
387 void unix_to_nt_time(NTTIME *nt, time_t t)
399 nt->low = 0xffffffff;
400 nt->high = 0x7fffffff;
405 nt->low = 0xffffffff;
406 nt->high = 0xffffffff;
410 /* this converts GMT to kludge-GMT */
411 t -= TimeDiff(t) - get_serverzone();
414 d += TIME_FIXUP_CONSTANT;
417 nt->high = (uint32)(d * (1.0/(4.0*(double)(1<<30))));
418 nt->low = (uint32)(d - ((double)nt->high)*4.0*(double)(1<<30));
421 /****************************************************************************
422 convert a time_t to a NTTIME structure
424 this is an absolute version of the one above.
425 By absolute I mean, it doesn't adjust from 1/1/1970 to 1/1/1601
426 if the nttime_t was 5 seconds, the NTTIME is 5 seconds. JFM
427 ****************************************************************************/
428 void unix_to_nt_time_abs(NTTIME *nt, time_t t)
438 if (t == TIME_T_MAX) {
439 nt->low = 0xffffffff;
440 nt->high = 0x7fffffff;
445 /* that's what NT uses for infinite */
447 nt->high = 0x80000000;
451 /* this converts GMT to kludge-GMT */
452 t -= LocTimeDiff(t) - get_serverzone();
457 nt->high = (uint32)(d * (1.0/(4.0*(double)(1<<30))));
458 nt->low = (uint32)(d - ((double)nt->high)*4.0*(double)(1<<30));
460 /* convert to a negative value */
466 /****************************************************************************
467 take an NTTIME structure, containing high / low time. convert to unix time.
468 lkclXXXX this may need 2 SIVALs not a memcpy. we'll see...
469 ****************************************************************************/
470 void put_long_date(char *p,time_t t)
473 unix_to_nt_time(&nt, t);
475 SIVAL(p, 4, nt.high);
478 /****************************************************************************
479 check if it's a null mtime
480 ****************************************************************************/
481 BOOL null_mtime(time_t mtime)
483 if (mtime == 0 || mtime == 0xFFFFFFFF || mtime == (time_t)-1)
488 /*******************************************************************
489 create a 16 bit dos packed date
490 ********************************************************************/
491 static uint16 make_dos_date1(struct tm *t)
494 ret = (((unsigned)(t->tm_mon+1)) >> 3) | ((t->tm_year-80) << 1);
495 ret = ((ret&0xFF)<<8) | (t->tm_mday | (((t->tm_mon+1) & 0x7) << 5));
499 /*******************************************************************
500 create a 16 bit dos packed time
501 ********************************************************************/
502 static uint16 make_dos_time1(struct tm *t)
505 ret = ((((unsigned)t->tm_min >> 3)&0x7) | (((unsigned)t->tm_hour) << 3));
506 ret = ((ret&0xFF)<<8) | ((t->tm_sec/2) | ((t->tm_min & 0x7) << 5));
510 /*******************************************************************
511 create a 32 bit dos packed date/time from some parameters
512 This takes a GMT time and returns a packed localtime structure
513 ********************************************************************/
514 static uint32 make_dos_date(time_t unixdate)
519 t = LocalTime(&unixdate);
523 ret = make_dos_date1(t);
524 ret = ((ret&0xFFFF)<<16) | make_dos_time1(t);
529 /*******************************************************************
530 put a dos date into a buffer (time/date format)
531 This takes GMT time and puts local time in the buffer
532 ********************************************************************/
533 void put_dos_date(char *buf,int offset,time_t unixdate)
535 uint32 x = make_dos_date(unixdate);
539 /*******************************************************************
540 put a dos date into a buffer (date/time format)
541 This takes GMT time and puts local time in the buffer
542 ********************************************************************/
543 void put_dos_date2(char *buf,int offset,time_t unixdate)
545 uint32 x = make_dos_date(unixdate);
546 x = ((x&0xFFFF)<<16) | ((x&0xFFFF0000)>>16);
550 /*******************************************************************
551 put a dos 32 bit "unix like" date into a buffer. This routine takes
552 GMT and converts it to LOCAL time before putting it (most SMBs assume
553 localtime for this sort of date)
554 ********************************************************************/
555 void put_dos_date3(char *buf,int offset,time_t unixdate)
557 if (!null_mtime(unixdate))
558 unixdate -= TimeDiff(unixdate);
559 SIVAL(buf,offset,unixdate);
562 /*******************************************************************
563 interpret a 32 bit dos packed date/time to some parameters
564 ********************************************************************/
565 static void interpret_dos_date(uint32 date,int *year,int *month,int *day,int *hour,int *minute,int *second)
569 p0=date&0xFF; p1=((date&0xFF00)>>8)&0xFF;
570 p2=((date&0xFF0000)>>16)&0xFF; p3=((date&0xFF000000)>>24)&0xFF;
572 *second = 2*(p0 & 0x1F);
573 *minute = ((p0>>5)&0xFF) + ((p1&0x7)<<3);
574 *hour = (p1>>3)&0xFF;
576 *month = ((p2>>5)&0xFF) + ((p3&0x1)<<3) - 1;
577 *year = ((p3>>1)&0xFF) + 80;
580 /*******************************************************************
581 create a unix date (int GMT) from a dos date (which is actually in
583 ********************************************************************/
584 time_t make_unix_date(void *date_ptr)
590 dos_date = IVAL(date_ptr,0);
592 if (dos_date == 0) return(0);
594 interpret_dos_date(dos_date,&t.tm_year,&t.tm_mon,
595 &t.tm_mday,&t.tm_hour,&t.tm_min,&t.tm_sec);
598 /* mktime() also does the local to GMT time conversion for us */
604 /*******************************************************************
605 like make_unix_date() but the words are reversed
606 ********************************************************************/
607 time_t make_unix_date2(void *date_ptr)
611 x = IVAL(date_ptr,0);
612 x2 = ((x&0xFFFF)<<16) | ((x&0xFFFF0000)>>16);
615 return(make_unix_date((void *)&x));
618 /*******************************************************************
619 create a unix GMT date from a dos date in 32 bit "unix like" format
620 these generally arrive as localtimes, with corresponding DST
621 ******************************************************************/
622 time_t make_unix_date3(void *date_ptr)
624 time_t t = (time_t)IVAL(date_ptr,0);
631 /***************************************************************************
632 return a HTTP/1.0 time string
633 ***************************************************************************/
634 char *http_timestring(time_t t)
637 struct tm *tm = LocalTime(&t);
640 slprintf(buf,sizeof(buf)-1,"%ld seconds since the Epoch",(long)t);
642 #ifndef HAVE_STRFTIME
643 fstrcpy(buf, asctime(tm));
644 if(buf[strlen(buf)-1] == '\n')
645 buf[strlen(buf)-1] = 0;
646 #else /* !HAVE_STRFTIME */
647 strftime(buf, sizeof(buf)-1, "%a, %d %b %Y %H:%M:%S %Z", tm);
648 #endif /* !HAVE_STRFTIME */
654 /****************************************************************************
655 Return the date and time as a string
656 ****************************************************************************/
658 char *timestring(BOOL hires)
660 static fstring TimeBuf;
667 t = (time_t)tp.tv_sec;
676 "%ld.%06ld seconds since the Epoch",
682 "%ld seconds since the Epoch",
688 strftime(TimeBuf,sizeof(TimeBuf)-1,"%Y/%m/%d %H:%M:%S",tm);
689 slprintf(TimeBuf+strlen(TimeBuf),
690 sizeof(TimeBuf)-1 - strlen(TimeBuf),
694 strftime(TimeBuf,100,"%Y/%m/%d %H:%M:%S",tm);
704 fstrcpy(TimeBuf, asctime(tm));
711 /****************************************************************************
712 return the best approximation to a 'create time' under UNIX from a stat
714 ****************************************************************************/
716 time_t get_create_time(SMB_STRUCT_STAT *st,BOOL fake_dirs)
720 if(S_ISDIR(st->st_mode) && fake_dirs)
721 return (time_t)315493200L; /* 1/1/1980 */
723 ret = MIN(st->st_ctime, st->st_mtime);
724 ret1 = MIN(ret, st->st_atime);
726 if(ret1 != (time_t)0)
730 * One of ctime, mtime or atime was zero (probably atime).
731 * Just return MIN(ctime, mtime).
736 /****************************************************************************
737 initialise an NTTIME to -1, which means "unknown" or "don't expire"
738 ****************************************************************************/
740 void init_nt_time(NTTIME *nt)
742 nt->high = 0x7FFFFFFF;
743 nt->low = 0xFFFFFFFF;