1#pragma once
2
3#ifdef __cplusplus
4extern "C" {
5#endif
6
7#include <features.h>
8
9#include <sys/select.h>
10
11int gettimeofday(struct timeval* __restrict, void* __restrict);
12
13#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
14
15#define ITIMER_REAL 0
16#define ITIMER_VIRTUAL 1
17#define ITIMER_PROF 2
18
19struct itimerval {
20    struct timeval it_interval;
21    struct timeval it_value;
22};
23
24int getitimer(int, struct itimerval*);
25int setitimer(int, const struct itimerval* __restrict, struct itimerval* __restrict);
26int utimes(const char*, const struct timeval[2]);
27
28#endif
29
30#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
31struct timezone {
32    int tz_minuteswest;
33    int tz_dsttime;
34};
35int futimes(int, const struct timeval[2]);
36int futimesat(int, const char*, const struct timeval[2]);
37int lutimes(const char*, const struct timeval[2]);
38int settimeofday(const struct timeval*, const struct timezone*);
39int adjtime(const struct timeval*, struct timeval*);
40#define timerisset(t) ((t)->tv_sec || (t)->tv_usec)
41#define timerclear(t) ((t)->tv_sec = (t)->tv_usec = 0)
42#define timercmp(s, t, op) \
43    ((s)->tv_sec == (t)->tv_sec ? (s)->tv_usec op(t)->tv_usec : (s)->tv_sec op(t)->tv_sec)
44#define timeradd(s, t, a)                                             \
45    (void)((a)->tv_sec = (s)->tv_sec + (t)->tv_sec,                   \
46           ((a)->tv_usec = (s)->tv_usec + (t)->tv_usec) >= 1000000 && \
47               ((a)->tv_usec -= 1000000, (a)->tv_sec++))
48#define timersub(s, t, a)                                      \
49    (void)((a)->tv_sec = (s)->tv_sec - (t)->tv_sec,            \
50           ((a)->tv_usec = (s)->tv_usec - (t)->tv_usec) < 0 && \
51               ((a)->tv_usec += 1000000, (a)->tv_sec--))
52#endif
53
54#if defined(_GNU_SOURCE)
55#define TIMEVAL_TO_TIMESPEC(tv, ts) \
56    ((ts)->tv_sec = (tv)->tv_sec, (ts)->tv_nsec = (tv)->tv_usec * 1000, (void)0)
57#define TIMESPEC_TO_TIMEVAL(tv, ts) \
58    ((tv)->tv_sec = (ts)->tv_sec, (tv)->tv_usec = (ts)->tv_nsec / 1000, (void)0)
59#endif
60
61#ifdef __cplusplus
62}
63#endif
64