lib/util/time.h

   1 /*
   2    Unix SMB/CIFS implementation.
   3    time utility functions
   4
   5    Copyright (C) Andrew Tridgell                1992-2004
   6    Copyright (C) Stefan (metze) Metzmacher      2002
   7    Copyright (C) Jeremy Allison                 2007
   8    Copyright (C) Andrew Bartlett                2011
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #ifndef _SAMBA_TIME_H_
  25 #define _SAMBA_TIME_H_
  26
  27 #include <stdbool.h>
  28 #include <stdint.h>
  29 #include <talloc.h>
  30
  31 #ifndef TIME_T_MIN
  32 /* we use 0 here, because (time_t)-1 means error */
  33 #define TIME_T_MIN 0
  34 #endif
  35
  36 /*
  37  * we use the INT32_MAX here as on 64 bit systems,
  38  * gmtime() fails with INT64_MAX
  39  */
  40 #ifndef TIME_T_MAX
  41 #define TIME_T_MAX MIN(INT32_MAX,_TYPE_MAXIMUM(time_t))
  42 #endif
  43
  44 /*
  45  * According to Windows API FileTimeToSystemTime() documentation the highest
  46  * allowed value " ... must be less than 0x8000000000000000.".
  47  */
  48 #define NTTIME_MAX INT64_MAX
  49
  50 /*
  51  * The lowest possible value when NTTIME=0 is used as sentinel value.
  52  */
  53 #define NTTIME_MIN 1
  54
  55 /*
  56  * NTTIME_OMIT in a setinfo tells us to not modify the corresponding on-disk
  57  * timestamp value.
  58  */
  59 #define NTTIME_OMIT 0
  60
  61 /*
  62  * Disable automatic timestamp updates, as described in MS-FSA. Samba doesn't
  63  * implement this yet.
  64  */
  65 #define NTTIME_FREEZE UINT64_MAX
  66
  67 #define SAMBA_UTIME_NOW UTIME_NOW
  68 #define SAMBA_UTIME_OMIT UTIME_OMIT
  69
  70 /* 64 bit time (100 nanosec) 1601 - cifs6.txt, section 3.5, page 30, 4 byte aligned */
  71 typedef uint64_t NTTIME;
  72
  73 /**
  74  External access to time_t_min and time_t_max.
  75 **/
  76 time_t get_time_t_max(void);
  77
  78 /**
  79 a gettimeofday wrapper
  80 **/
  81 void GetTimeOfDay(struct timeval *tval);
  82
  83 /**
  84 a wrapper to preferably get the monotonic time
  85 **/
  86 void clock_gettime_mono(struct timespec *tp);
  87
  88 /**
  89 a wrapper to preferably get the monotonic time in s
  90 **/
  91 time_t time_mono(time_t *t);
  92
  93 /**
  94 interpret an 8 byte "filetime" structure to a time_t
  95 It's originally in "100ns units since jan 1st 1601"
  96 **/
  97 time_t nt_time_to_unix(NTTIME nt);
  98
  99 /**
 100 put a 8 byte filetime from a time_t
 101 This takes GMT as input
 102 **/
 103 void unix_to_nt_time(NTTIME *nt, time_t t);
 104
 105 /**
 106 check if it's a null unix time
 107 **/
 108 bool null_time(time_t t);
 109
 110 /**
 111 check if it's a null NTTIME
 112 **/
 113 bool null_nttime(NTTIME t);
 114
 115 /**
 116 put a dos date into a buffer (time/date format)
 117 This takes GMT time and puts local time in the buffer
 118 **/
 119 void push_dos_date(uint8_t *buf, int offset, time_t unixdate, int zone_offset);
 120
 121 /**
 122 put a dos date into a buffer (date/time format)
 123 This takes GMT time and puts local time in the buffer
 124 **/
 125 void push_dos_date2(uint8_t *buf,int offset,time_t unixdate, int zone_offset);
 126
 127 /**
 128 put a dos 32 bit "unix like" date into a buffer. This routine takes
 129 GMT and converts it to LOCAL time before putting it (most SMBs assume
 130 localtime for this sort of date)
 131 **/
 132 void push_dos_date3(uint8_t *buf,int offset,time_t unixdate, int zone_offset);
 133
 134 /**
 135   create a unix date (int GMT) from a dos date (which is actually in
 136   localtime)
 137 **/
 138 time_t pull_dos_date(const uint8_t *date_ptr, int zone_offset);
 139
 140 /**
 141 like make_unix_date() but the words are reversed
 142 **/
 143 time_t pull_dos_date2(const uint8_t *date_ptr, int zone_offset);
 144
 145 /**
 146   create a unix GMT date from a dos date in 32 bit "unix like" format
 147   these generally arrive as localtimes, with corresponding DST
 148 **/
 149 time_t pull_dos_date3(const uint8_t *date_ptr, int zone_offset);
 150
 151 /**
 152  Return a date and time as a string (optionally with microseconds)
 153
 154  format is %Y/%m/%d %H:%M:%S if strftime is available
 155 **/
 156
 157 char *timeval_string(TALLOC_CTX *ctx, const struct timeval *tp, bool hires);
 158
 159 struct timeval_buf;
 160 const char *timespec_string_buf(const struct timespec *tp,
 161                                 bool hires,
 162                                 struct timeval_buf *buf);
 163
 164 /**
 165  Return the current date and time as a string (optionally with microseconds)
 166
 167  format is %Y/%m/%d %H:%M:%S if strftime is available
 168 **/
 169 char *current_timestring(TALLOC_CTX *ctx, bool hires);
 170
 171 /**
 172  Return a date and time as a string (optionally with microseconds)
 173
 174  format is %Y%m%d_%H%M%S or %Y%m%d_%H%M%S_%us
 175 **/
 176
 177 char *minimal_timeval_string(TALLOC_CTX *ctx, const struct timeval *tp, bool hires);
 178
 179 /**
 180  Return the current date and time as a string (optionally with microseconds)
 181
 182  format is %Y%m%d_%H%M%S or %Y%m%d_%H%M%S_%us
 183 **/
 184 char *current_minimal_timestring(TALLOC_CTX *ctx, bool hires);
 185
 186 /**
 187 return a HTTP/1.0 time string
 188 **/
 189 char *http_timestring(TALLOC_CTX *mem_ctx, time_t t);
 190
 191 /**
 192  Return the date and time as a string
 193
 194  format is %a %b %e %X %Y %Z
 195 **/
 196 char *timestring(TALLOC_CTX *mem_ctx, time_t t);
 197
 198 /**
 199   return a talloced string representing a NTTIME for human consumption
 200 */
 201 const char *nt_time_string(TALLOC_CTX *mem_ctx, NTTIME nt);
 202
 203 /**
 204   put a NTTIME into a packet
 205 */
 206 void push_nttime(uint8_t *base, uint16_t offset, NTTIME t);
 207
 208 /**
 209   pull a NTTIME from a packet
 210 */
 211 NTTIME pull_nttime(uint8_t *base, uint16_t offset);
 212
 213 /**
 214   return (tv1 - tv2) in microseconds
 215 */
 216 int64_t usec_time_diff(const struct timeval *tv1, const struct timeval *tv2);
 217
 218 /**
 219   return (tp1 - tp2) in nanoseconds
 220 */
 221 int64_t nsec_time_diff(const struct timespec *tp1, const struct timespec *tp2);
 222
 223 /**
 224   return a zero timeval
 225 */
 226 struct timeval timeval_zero(void);
 227
 228 /**
 229   return true if a timeval is zero
 230 */
 231 bool timeval_is_zero(const struct timeval *tv);
 232
 233 /**
 234   return a timeval for the current time
 235 */
 236 struct timeval timeval_current(void);
 237
 238 /**
 239   return a timeval struct with the given elements
 240 */
 241 struct timeval timeval_set(uint32_t secs, uint32_t usecs);
 242
 243 /**
 244   return a timeval ofs microseconds after tv
 245 */
 246 struct timeval timeval_add(const struct timeval *tv,
 247                            uint32_t secs, uint32_t usecs);
 248
 249 /**
 250   return the sum of two timeval structures
 251 */
 252 struct timeval timeval_sum(const struct timeval *tv1,
 253                            const struct timeval *tv2);
 254
 255 /**
 256   return a timeval secs/usecs into the future
 257 */
 258 struct timeval timeval_current_ofs(uint32_t secs, uint32_t usecs);
 259
 260 /**
 261   return a timeval milliseconds into the future
 262 */
 263 struct timeval timeval_current_ofs_msec(uint32_t msecs);
 264
 265 /**
 266   return a timeval microseconds into the future
 267 */
 268 struct timeval timeval_current_ofs_usec(uint32_t usecs);
 269
 270 /**
 271   compare two timeval structures.
 272   Return -1 if tv1 < tv2
 273   Return 0 if tv1 == tv2
 274   Return 1 if tv1 > tv2
 275 */
 276 int timeval_compare(const struct timeval *tv1, const struct timeval *tv2);
 277
 278 /**
 279   return true if a timer is in the past
 280 */
 281 bool timeval_expired(const struct timeval *tv);
 282
 283 /**
 284   return the number of seconds elapsed between two times
 285 */
 286 double timeval_elapsed2(const struct timeval *tv1, const struct timeval *tv2);
 287
 288 /**
 289   return the number of seconds elapsed since a given time
 290 */
 291 double timeval_elapsed(const struct timeval *tv);
 292
 293 /**
 294   return the number of seconds elapsed between two times
 295 */
 296 double timespec_elapsed2(const struct timespec *ts1,
 297                          const struct timespec *ts2);
 298 /**
 299   return the number of seconds elapsed since a given time
 300 */
 301 double timespec_elapsed(const struct timespec *ts);
 302
 303 /**
 304   return the lesser of two timevals
 305 */
 306 struct timeval timeval_min(const struct timeval *tv1,
 307                            const struct timeval *tv2);
 308
 309 /**
 310   return the greater of two timevals
 311 */
 312 struct timeval timeval_max(const struct timeval *tv1,
 313                            const struct timeval *tv2);
 314
 315 /**
 316   return the difference between two timevals as a timeval
 317   if tv1 comes after tv2, then return a zero timeval
 318   (this is *tv2 - *tv1)
 319 */
 320 struct timeval timeval_until(const struct timeval *tv1,
 321                              const struct timeval *tv2);
 322
 323 /**
 324   convert a timeval to a NTTIME
 325 */
 326 NTTIME timeval_to_nttime(const struct timeval *tv);
 327
 328 /**
 329   convert a NTTIME to a timeval
 330 */
 331 void nttime_to_timeval(struct timeval *tv, NTTIME t);
 332
 333 /**
 334   return the UTC offset in seconds west of UTC, or 0 if it cannot be determined
 335  */
 336 int get_time_zone(time_t t);
 337
 338 /**
 339   check if 2 NTTIMEs are equal.
 340 */
 341 bool nt_time_equal(NTTIME *t1, NTTIME *t2);
 342
 343 void interpret_dos_date(uint32_t date,int *year,int *month,int *day,int *hour,int *minute,int *second);
 344
 345 struct timespec nt_time_to_unix_timespec(NTTIME nt);
 346
 347 time_t convert_timespec_to_time_t(struct timespec ts);
 348
 349 struct timespec convert_time_t_to_timespec(time_t t);
 350
 351 bool null_timespec(struct timespec ts);
 352
 353 struct timespec convert_timeval_to_timespec(const struct timeval tv);
 354 struct timeval convert_timespec_to_timeval(const struct timespec ts);
 355 struct timespec timespec_current(void);
 356 struct timespec timespec_min(const struct timespec *ts1,
 357                              const struct timespec *ts2);
 358 int timespec_compare(const struct timespec *ts1, const struct timespec *ts2);
 359 void round_timespec_to_sec(struct timespec *ts);
 360 void round_timespec_to_usec(struct timespec *ts);
 361 void round_timespec_to_nttime(struct timespec *ts);
 362 NTTIME unix_timespec_to_nt_time(struct timespec ts);
 363 void normalize_timespec(struct timespec *ts);
 364
 365 /*
 366  * Functions supporting the full range of time_t and struct timespec values,
 367  * including 0, -1 and all other negative values. These functions don't use 0 or
 368  * -1 values as sentinel to denote "unset" variables, but use the POSIX 2008
 369  * define UTIME_OMIT from utimensat(2).
 370  */
 371 bool is_omit_timespec(const struct timespec *ts);
 372 struct timespec make_omit_timespec(void);
 373 NTTIME full_timespec_to_nt_time(const struct timespec *ts);
 374 struct timespec nt_time_to_full_timespec(NTTIME nt);
 375 time_t full_timespec_to_time_t(const struct timespec *ts);
 376 time_t nt_time_to_full_time_t(NTTIME nt);
 377 struct timespec time_t_to_full_timespec(time_t t);
 378
 379 /*
 380  * Functions to get and set the number of nanoseconds for times in a stat field.
 381  * If the stat has timestamp granularity less than nanosecond, then the set_*
 382  * operations will be lossy.
 383  */
 384 struct stat;
 385 time_t get_atimensec(const struct stat *);
 386 time_t get_mtimensec(const struct stat *);
 387 time_t get_ctimensec(const struct stat *);
 388 void set_atimensec(struct stat *, time_t);
 389 void set_mtimensec(struct stat *, time_t);
 390 void set_ctimensec(struct stat *, time_t);
 391
 392 /* These are convenience wrappers for the above getters. */
 393 struct timespec get_atimespec(const struct stat *);
 394 struct timespec get_mtimespec(const struct stat *);
 395 struct timespec get_ctimespec(const struct stat *);
 396
 397 #endif /* _SAMBA_TIME_H_ */