headers/posix/sys/time.h

   1 /*
   2  * Copyright 2002-2012 Haiku, Inc. All Rights Reserved.
   3  * Distributed under the terms of the MIT License.
   4  */
   5 #ifndef _SYS_TIME_H
   6 #define _SYS_TIME_H
   7
   8
   9 #include <sys/types.h>
  10
  11
  12 struct timeval {
  13         time_t          tv_sec;         /* seconds */
  14         suseconds_t     tv_usec;        /* microseconds */
  15 };
  16
  17 #include <sys/select.h>
  18         /* circular dependency: fd_set needs to be defined and the
  19          * select prototype exported by this file, but <sys/select.h>
  20          * needs struct timeval.
  21          */
  22
  23 struct timezone {
  24         int tz_minuteswest;
  25         int tz_dsttime;
  26 };
  27
  28 struct itimerval {
  29         struct timeval it_interval;
  30         struct timeval it_value;
  31 };
  32
  33 #define ITIMER_REAL             1       /* real time */
  34 #define ITIMER_VIRTUAL  2       /* process virtual time */
  35 #define ITIMER_PROF             3       /* both */
  36
  37
  38 #ifdef __cplusplus
  39 extern "C" {
  40 #endif
  41
  42 extern int      getitimer(int which, struct itimerval *value);
  43 extern int      setitimer(int which, const struct itimerval *value, struct itimerval *oldValue);
  44 extern int      gettimeofday(struct timeval *tv, void *tz);
  45
  46 extern int      utimes(const char *path, const struct timeval times[2]);
  47         /* legacy */
  48
  49 #ifdef __cplusplus
  50 }
  51 #endif
  52
  53 /* BSDish macros operating on timeval structs */
  54 #define timeradd(a, b, res)                                                             \
  55         do {                                                                                            \
  56                 (res)->tv_sec = (a)->tv_sec + (b)->tv_sec;              \
  57                 (res)->tv_usec = (a)->tv_usec + (b)->tv_usec;   \
  58                 if ((res)->tv_usec >= 1000000) {                                \
  59                         (res)->tv_usec -= 1000000;                                      \
  60                         (res)->tv_sec++;                                                        \
  61                 }                                                                                               \
  62         } while (0)
  63 #define timersub(a, b, res)                                                             \
  64         do {                                                                                            \
  65                 (res)->tv_sec = (a)->tv_sec - (b)->tv_sec;              \
  66                 (res)->tv_usec = (a)->tv_usec - (b)->tv_usec;   \
  67                 if ((res)->tv_usec < 0) {                                               \
  68                         (res)->tv_usec += 1000000;                                      \
  69                         (res)->tv_sec--;                                                        \
  70                 }                                                                                               \
  71         } while (0)
  72 #define timerclear(a)   ((a)->tv_sec = (a)->tv_usec = 0)
  73 #define timerisset(a)   ((a)->tv_sec != 0 || (a)->tv_usec != 0)
  74 #define timercmp(a, b, cmp)     ((a)->tv_sec == (b)->tv_sec \
  75                 ? (a)->tv_usec cmp (b)->tv_usec : (a)->tv_sec cmp (b)->tv_sec)
  76
  77 #endif  /* _SYS_TIME_H */