include/sys/time.h

   1 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
   2 /*        All Rights Reserved   */
   3
   4
   5 /*
   6  * Copyright (c) 1982, 1986, 1993 Regents of the University of California.
   7  * All rights reserved.  The Berkeley software License Agreement
   8  * specifies the terms and conditions for redistribution.
   9  */
  10
  11 /*
  12  * Copyright 2014 Garrett D'Amore <garrett@damore.org>
  13  *
  14  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  15  * Use is subject to license terms.
  16  *
  17  * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
  18  */
  19
  20 /*
  21  * Copyright (c) 2013, 2015 by Delphix. All rights reserved.
  22  */
  23
  24 #ifndef _SYS_TIME_H
  25 #define _SYS_TIME_H
  26
  27 #include <sys/feature_tests.h>
  28
  29 /*
  30  * Structure returned by gettimeofday(2) system call,
  31  * and used in other calls.
  32  */
  33
  34 #ifdef  __cplusplus
  35 extern "C" {
  36 #endif
  37
  38 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG4_2) || \
  39         defined(__EXTENSIONS__)
  40 #ifndef _ASM
  41
  42 #if !defined(_TIME_T) || __cplusplus >= 199711L
  43 #define _TIME_T
  44 typedef long    time_t;         /* time of day in seconds */
  45 #endif  /* _TIME_T */
  46
  47 #ifndef _SUSECONDS_T
  48 #define _SUSECONDS_T
  49 typedef long    suseconds_t;    /* signed # of microseconds */
  50 #endif  /* _SUSECONDS_T */
  51
  52 struct timeval {
  53         time_t          tv_sec;         /* seconds */
  54         suseconds_t     tv_usec;        /* and microseconds */
  55 };
  56
  57 #if defined(_SYSCALL32)
  58
  59 #include <sys/types32.h>
  60
  61 #define TIMEVAL32_TO_TIMEVAL(tv, tv32)  {       \
  62         (tv)->tv_sec = (time_t)(tv32)->tv_sec;  \
  63         (tv)->tv_usec = (tv32)->tv_usec;        \
  64 }
  65
  66 #define TIMEVAL_TO_TIMEVAL32(tv32, tv)  {               \
  67         (tv32)->tv_sec = (time32_t)(tv)->tv_sec;        \
  68         (tv32)->tv_usec = (int32_t)(tv)->tv_usec;       \
  69 }
  70
  71 #define TIME32_MAX      INT32_MAX
  72 #define TIME32_MIN      INT32_MIN
  73
  74 #define TIMEVAL_OVERFLOW(tv)    \
  75         ((tv)->tv_sec < TIME32_MIN || (tv)->tv_sec > TIME32_MAX)
  76
  77 #endif  /* _SYSCALL32 */
  78
  79 #endif  /* _ASM */
  80 #endif  /* !defined(__XOPEN_OR_POSIX) || defined(_XPG4_2) ... */
  81
  82 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
  83 #ifndef _ASM
  84 struct timezone {
  85         int     tz_minuteswest; /* minutes west of Greenwich */
  86         int     tz_dsttime;     /* type of dst correction */
  87 };
  88
  89 #endif  /* _ASM */
  90 #endif /* !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__) */
  91
  92 #ifdef  __cplusplus
  93 }
  94 #endif
  95
  96 /*
  97  * Needed for longlong_t type.  Placement of this due to <sys/types.h>
  98  * including <sys/select.h> which relies on the presense of the itimerval
  99  * structure.
 100  */
 101 #ifndef _ASM
 102 #include <sys/types.h>
 103 #endif  /* _ASM */
 104
 105 #ifdef  __cplusplus
 106 extern "C" {
 107 #endif
 108
 109 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 110
 111 #define DST_NONE        0       /* not on dst */
 112 #define DST_USA         1       /* USA style dst */
 113 #define DST_AUST        2       /* Australian style dst */
 114 #define DST_WET         3       /* Western European dst */
 115 #define DST_MET         4       /* Middle European dst */
 116 #define DST_EET         5       /* Eastern European dst */
 117 #define DST_CAN         6       /* Canada */
 118 #define DST_GB          7       /* Great Britain and Eire */
 119 #define DST_RUM         8       /* Rumania */
 120 #define DST_TUR         9       /* Turkey */
 121 #define DST_AUSTALT     10      /* Australian style with shift in 1986 */
 122
 123 /*
 124  * Operations on timevals.
 125  */
 126 #define timerisset(tvp)         ((tvp)->tv_sec || (tvp)->tv_usec)
 127 #define timercmp(tvp, uvp, cmp) \
 128         (((tvp)->tv_sec == (uvp)->tv_sec) ? \
 129             /* CSTYLED */ \
 130             ((tvp)->tv_usec cmp (uvp)->tv_usec) : \
 131             /* CSTYLED */ \
 132             ((tvp)->tv_sec cmp (uvp)->tv_sec))
 133
 134 #define timerclear(tvp)         (tvp)->tv_sec = (tvp)->tv_usec = 0
 135
 136 #define timeradd(tvp, uvp, vvp)                                 \
 137         do                                                              \
 138         {                                                               \
 139                 (vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec;          \
 140                 (vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec;       \
 141                 if ((vvp)->tv_usec >= 1000000)                          \
 142                 {                                                       \
 143                         (vvp)->tv_sec++;                                \
 144                         (vvp)->tv_usec -= 1000000;                      \
 145                 }                                                       \
 146         } while (0)
 147
 148 #define timersub(tvp, uvp, vvp)                                 \
 149         do                                                              \
 150         {                                                               \
 151                 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec;          \
 152                 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec;       \
 153                 if ((vvp)->tv_usec < 0)                                 \
 154                 {                                                       \
 155                         (vvp)->tv_sec--;                                \
 156                         (vvp)->tv_usec += 1000000;                      \
 157                 }                                                       \
 158         } while (0)
 159
 160 #endif /* !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__) */
 161
 162 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG4_2) || defined(__EXTENSIONS__)
 163 /*
 164  * Names of the interval timers, and structure
 165  * defining a timer setting.
 166  */
 167 #define ITIMER_REAL     0       /* Decrements in real time */
 168 #define ITIMER_VIRTUAL  1       /* Decrements in process virtual time */
 169 #define ITIMER_PROF     2       /* Decrements both in process virtual */
 170                                 /* time and when system is running on */
 171                                 /* behalf of the process. */
 172 #define ITIMER_REALPROF 3       /* Decrements in real time for real- */
 173                                 /* time profiling of multithreaded */
 174                                 /* programs. */
 175
 176 #ifndef _ASM
 177 struct  itimerval {
 178         struct  timeval it_interval;    /* timer interval */
 179         struct  timeval it_value;       /* current value */
 180 };
 181
 182 #if defined(_SYSCALL32)
 183
 184 struct itimerval32 {
 185         struct  timeval32 it_interval;
 186         struct  timeval32 it_value;
 187 };
 188
 189 #define ITIMERVAL32_TO_ITIMERVAL(itv, itv32)    {       \
 190         TIMEVAL32_TO_TIMEVAL(&(itv)->it_interval, &(itv32)->it_interval); \
 191         TIMEVAL32_TO_TIMEVAL(&(itv)->it_value, &(itv32)->it_value);     \
 192 }
 193
 194 #define ITIMERVAL_TO_ITIMERVAL32(itv32, itv)    {       \
 195         TIMEVAL_TO_TIMEVAL32(&(itv32)->it_interval, &(itv)->it_interval); \
 196         TIMEVAL_TO_TIMEVAL32(&(itv32)->it_value, &(itv)->it_value);     \
 197 }
 198
 199 #define ITIMERVAL_OVERFLOW(itv)                         \
 200         (TIMEVAL_OVERFLOW(&(itv)->it_interval) ||       \
 201         TIMEVAL_OVERFLOW(&(itv)->it_value))
 202
 203 #endif  /* _SYSCALL32 */
 204 #endif  /* _ASM */
 205 #endif /* !defined(__XOPEN_OR_POSIX) || defined(_XPG4_2) ... */
 206
 207
 208 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 209 /*
 210  *      Definitions for commonly used resolutions.
 211  */
 212 #define SEC             1
 213 #define MILLISEC        1000
 214 #define MICROSEC        1000000
 215 #define NANOSEC         1000000000LL
 216
 217 #define NSEC2USEC(n)    ((n) / (NANOSEC / MICROSEC))
 218 #define USEC2NSEC(u)    ((hrtime_t)(u) * (NANOSEC / MICROSEC))
 219
 220 #define MSEC2NSEC(m)    ((hrtime_t)(m) * (NANOSEC / MILLISEC))
 221 #define NSEC2MSEC(n)    ((n) / (NANOSEC / MILLISEC))
 222
 223 #define NSEC2SEC(n)     ((n) / (NANOSEC / SEC))
 224 #define SEC2NSEC(m)     ((hrtime_t)(m) * (NANOSEC / SEC))
 225
 226 #endif /* !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__) */
 227
 228 #ifndef _ASM
 229
 230 /*
 231  * Time expressed as a 64-bit nanosecond counter.
 232  */
 233 typedef longlong_t      hrtime_t;
 234
 235 #if defined(_KERNEL)
 236
 237 #include <sys/time_impl.h>
 238 #include <sys/mutex.h>
 239
 240 extern int tick_per_msec;       /* clock ticks per millisecond (may be zero) */
 241 extern int msec_per_tick;       /* milliseconds per clock tick (may be zero) */
 242 extern int usec_per_tick;       /* microseconds per clock tick */
 243 extern int nsec_per_tick;       /* nanoseconds per clock tick */
 244
 245 /*
 246  * Macros to convert from common units of time (sec, msec, usec, nsec,
 247  * timeval, timestruc) to clock ticks and vice versa.
 248  */
 249 #define TICK_TO_SEC(tick)       ((tick) / hz)
 250 #define SEC_TO_TICK(sec)        ((sec) * hz)
 251
 252 #define TICK_TO_MSEC(tick)      \
 253         (msec_per_tick ? (tick) * msec_per_tick : (tick) / tick_per_msec)
 254 #define MSEC_TO_TICK(msec)      \
 255         (msec_per_tick ? (msec) / msec_per_tick : (msec) * tick_per_msec)
 256 #define MSEC_TO_TICK_ROUNDUP(msec)      \
 257         (msec_per_tick ? \
 258         ((msec) == 0 ? 0 : ((msec) - 1) / msec_per_tick + 1) : \
 259         (msec) * tick_per_msec)
 260
 261 #define TICK_TO_USEC(tick)              ((tick) * usec_per_tick)
 262 #define USEC_TO_TICK(usec)              ((usec) / usec_per_tick)
 263 #define USEC_TO_TICK_ROUNDUP(usec)      \
 264         ((usec) == 0 ? 0 : USEC_TO_TICK((usec) - 1) + 1)
 265
 266 #define TICK_TO_NSEC(tick)              ((hrtime_t)(tick) * nsec_per_tick)
 267 #define NSEC_TO_TICK(nsec)              ((nsec) / nsec_per_tick)
 268 #define NSEC_TO_TICK_ROUNDUP(nsec)      \
 269         ((nsec) == 0 ? 0 : NSEC_TO_TICK((nsec) - 1) + 1)
 270
 271 #define TICK_TO_TIMEVAL(tick, tvp) {    \
 272         clock_t __tmptck = (tick);      \
 273         (tvp)->tv_sec = TICK_TO_SEC(__tmptck);  \
 274         (tvp)->tv_usec = TICK_TO_USEC(__tmptck - SEC_TO_TICK((tvp)->tv_sec)); \
 275 }
 276
 277 #define TICK_TO_TIMEVAL32(tick, tvp) {  \
 278         clock_t __tmptck = (tick);      \
 279         time_t __tmptm = TICK_TO_SEC(__tmptck); \
 280         (tvp)->tv_sec = (time32_t)__tmptm;      \
 281         (tvp)->tv_usec = TICK_TO_USEC(__tmptck - SEC_TO_TICK(__tmptm)); \
 282 }
 283
 284 #define TICK_TO_TIMESTRUC(tick, tsp) {  \
 285         clock_t __tmptck = (tick);      \
 286         (tsp)->tv_sec = TICK_TO_SEC(__tmptck);  \
 287         (tsp)->tv_nsec = TICK_TO_NSEC(__tmptck - SEC_TO_TICK((tsp)->tv_sec)); \
 288 }
 289
 290 #define TICK_TO_TIMESTRUC32(tick, tsp) {        \
 291         clock_t __tmptck = (tick);                      \
 292         time_t __tmptm = TICK_TO_SEC(__tmptck);         \
 293         (tsp)->tv_sec = (time32_t)__tmptm;              \
 294         (tsp)->tv_nsec = TICK_TO_NSEC(__tmptck - SEC_TO_TICK(__tmptm)); \
 295 }
 296
 297 #define TIMEVAL_TO_TICK(tvp)    \
 298         (SEC_TO_TICK((tvp)->tv_sec) + USEC_TO_TICK((tvp)->tv_usec))
 299
 300 #define TIMESTRUC_TO_TICK(tsp)  \
 301         (SEC_TO_TICK((tsp)->tv_sec) + NSEC_TO_TICK((tsp)->tv_nsec))
 302
 303 typedef struct todinfo {
 304         int     tod_sec;        /* seconds 0-59 */
 305         int     tod_min;        /* minutes 0-59 */
 306         int     tod_hour;       /* hours 0-23 */
 307         int     tod_dow;        /* day of week 1-7 */
 308         int     tod_day;        /* day of month 1-31 */
 309         int     tod_month;      /* month 1-12 */
 310         int     tod_year;       /* year 70+ */
 311 } todinfo_t;
 312
 313 extern  int64_t         timedelta;
 314 extern  int             timechanged;
 315 extern  int             tod_needsync;
 316 extern  kmutex_t        tod_lock;
 317 extern  volatile timestruc_t    hrestime;
 318 extern  hrtime_t        hres_last_tick;
 319 extern  int64_t         hrestime_adj;
 320 extern  uint_t          adj_shift;
 321
 322 extern  timestruc_t     tod_get(void);
 323 extern  void            tod_set(timestruc_t);
 324 extern  void            set_hrestime(timestruc_t *);
 325 extern  todinfo_t       utc_to_tod(time_t);
 326 extern  time_t          tod_to_utc(todinfo_t);
 327 extern  int             hr_clock_lock(void);
 328 extern  void            hr_clock_unlock(int);
 329 extern  hrtime_t        gethrtime(void);
 330 extern  hrtime_t        gethrtime_unscaled(void);
 331 extern  hrtime_t        gethrtime_max(void);
 332 extern  hrtime_t        gethrtime_waitfree(void);
 333 extern  void            scalehrtime(hrtime_t *);
 334 extern  uint64_t        unscalehrtime(hrtime_t);
 335 extern  void            gethrestime(timespec_t *);
 336 extern  time_t          gethrestime_sec(void);
 337 extern  void            gethrestime_lasttick(timespec_t *);
 338 extern  void            hrt2ts(hrtime_t, timestruc_t *);
 339 extern  hrtime_t        ts2hrt(const timestruc_t *);
 340 extern  void            hrt2tv(hrtime_t, struct timeval *);
 341 extern  hrtime_t        tv2hrt(struct timeval *);
 342 extern  int             itimerfix(struct timeval *, int);
 343 extern  int             itimerdecr(struct itimerval *, int);
 344 extern  void            timevaladd(struct timeval *, struct timeval *);
 345 extern  void            timevalsub(struct timeval *, struct timeval *);
 346 extern  void            timevalfix(struct timeval *);
 347 extern  void            dtrace_hres_tick(void);
 348
 349 extern clock_t          ddi_get_lbolt(void);
 350 extern int64_t          ddi_get_lbolt64(void);
 351
 352 #if defined(_SYSCALL32)
 353 extern  void            hrt2ts32(hrtime_t, timestruc32_t *);
 354 #endif
 355
 356 #endif /* _KERNEL */
 357
 358 #if !defined(_KERNEL) && !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 359 int adjtime(struct timeval *, struct timeval *);
 360 #endif /* !defined(_KERNEL) && !defined(__XOPEN_OR_POSIX) ... */
 361
 362 #if !defined(_KERNEL) && !defined(__XOPEN_OR_POSIX) || \
 363         defined(_ATFILE_SOURCE) || defined(__EXTENSIONS__)
 364 int futimesat(int, const char *, const struct timeval *);
 365 #endif /* defined(__ATFILE_SOURCE) */
 366
 367 #if !defined(_KERNEL) && !defined(__XOPEN_OR_POSIX) || defined(_XPG4_2) || \
 368         defined(__EXTENSIONS__)
 369
 370 int getitimer(int, struct itimerval *);
 371 int utimes(const char *, const struct timeval *);
 372 #if defined(_XPG4_2)
 373 int setitimer(int, const struct itimerval *_RESTRICT_KYWD,
 374         struct itimerval *_RESTRICT_KYWD);
 375 #else
 376 int setitimer(int, struct itimerval *_RESTRICT_KYWD,
 377         struct itimerval *_RESTRICT_KYWD);
 378 #endif /* defined(_XPG2_2) */
 379
 380 #endif /* !defined(_KERNEL) ... defined(_XPG4_2) */
 381
 382 /*
 383  * gettimeofday() and settimeofday() were included in SVr4 due to their
 384  * common use in BSD based applications.  They were to be included exactly
 385  * as in BSD, with two parameters.  However, AT&T/USL noted that the second
 386  * parameter was unused and deleted it, thereby making a routine included
 387  * for compatibility, incompatible.
 388  *
 389  * XSH4.2 (spec 1170) defines gettimeofday and settimeofday to have two
 390  * parameters.
 391  *
 392  * This has caused general disagreement in the application community as to
 393  * the syntax of these routines.  Solaris defaults to the XSH4.2 definition.
 394  * The flag _SVID_GETTOD may be used to force the SVID version.
 395  */
 396 #if !defined(_KERNEL) && !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 397
 398 #if defined(_SVID_GETTOD)
 399 int settimeofday(struct timeval *);
 400 #else
 401 int settimeofday(struct timeval *, void *);
 402 #endif
 403 hrtime_t        gethrtime(void);
 404 hrtime_t        gethrvtime(void);
 405
 406 #endif /* !(defined _KERNEL) && !defined(__XOPEN_OR_POSIX) ... */
 407
 408 #if !defined(_KERNEL) && !defined(__XOPEN_OR_POSIX) || defined(_XPG4_2) || \
 409         defined(__EXTENSIONS__)
 410
 411 #if defined(_SVID_GETTOD)
 412 int gettimeofday(struct timeval *);
 413 #else
 414 int gettimeofday(struct timeval *_RESTRICT_KYWD, void *_RESTRICT_KYWD);
 415 #endif
 416
 417 #endif /* !defined(_KERNEL) && !defined(__XOPEN_OR_POSIX) ... */
 418
 419 /*
 420  * The inclusion of <time.h> is historical and was added for
 421  * backward compatibility in delta 1.2 when a number of definitions
 422  * were moved out of <sys/time.h>.  More recently, the timespec and
 423  * itimerspec structure definitions, along with the _CLOCK_*, CLOCK_*,
 424  * _TIMER_*, and TIMER_* symbols were moved to <sys/time_impl.h>,
 425  * which is now included by <time.h>.  This change was due to POSIX
 426  * 1003.1b-1993 and X/Open UNIX 98 requirements.  For non-POSIX and
 427  * non-X/Open applications, including this header will still make
 428  * visible these definitions.
 429  */
 430 #if !defined(_BOOT) && !defined(_KERNEL) && \
 431         !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 432 #include <time.h>
 433 #endif
 434
 435 /*
 436  * The inclusion of <sys/select.h> is needed for the FD_CLR,
 437  * FD_ISSET, FD_SET, and FD_SETSIZE macros as well as the
 438  * select() prototype defined in the XOpen specifications
 439  * beginning with XSH4v2.  Placement required after definition
 440  * for itimerval.
 441  */
 442 #if !defined(_KERNEL) && \
 443         !defined(__XOPEN_OR_POSIX) || \
 444         defined(_XPG4_2) || defined(__EXTENSIONS__)
 445 #include <sys/select.h>
 446 #endif
 447
 448 #endif  /* _ASM */
 449
 450 #ifdef  __cplusplus
 451 }
 452 #endif
 453
 454 #endif  /* _SYS_TIME_H */