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1da177e4 LT |
1 | #ifndef _LINUX_TIME_H |
2 | #define _LINUX_TIME_H | |
3 | ||
4 | #include <linux/types.h> | |
5 | ||
6 | #ifdef __KERNEL__ | |
57a55875 | 7 | # include <linux/seqlock.h> |
1da177e4 LT |
8 | #endif |
9 | ||
10 | #ifndef _STRUCT_TIMESPEC | |
11 | #define _STRUCT_TIMESPEC | |
12 | struct timespec { | |
13 | time_t tv_sec; /* seconds */ | |
14 | long tv_nsec; /* nanoseconds */ | |
15 | }; | |
57a55875 | 16 | #endif |
1da177e4 LT |
17 | |
18 | struct timeval { | |
19 | time_t tv_sec; /* seconds */ | |
20 | suseconds_t tv_usec; /* microseconds */ | |
21 | }; | |
22 | ||
23 | struct timezone { | |
24 | int tz_minuteswest; /* minutes west of Greenwich */ | |
25 | int tz_dsttime; /* type of dst correction */ | |
26 | }; | |
27 | ||
28 | #ifdef __KERNEL__ | |
29 | ||
57a55875 IM |
30 | /* Parameters used to convert the timespec values: */ |
31 | #define MSEC_PER_SEC 1000L | |
32 | #define USEC_PER_SEC 1000000L | |
33 | #define NSEC_PER_SEC 1000000000L | |
34 | #define NSEC_PER_USEC 1000L | |
1da177e4 | 35 | |
643a6545 | 36 | static inline int timespec_equal(struct timespec *a, struct timespec *b) |
57a55875 | 37 | { |
1da177e4 | 38 | return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); |
57a55875 | 39 | } |
1da177e4 | 40 | |
643a6545 AM |
41 | /* |
42 | * lhs < rhs: return <0 | |
43 | * lhs == rhs: return 0 | |
44 | * lhs > rhs: return >0 | |
45 | */ | |
46 | static inline int timespec_compare(struct timespec *lhs, struct timespec *rhs) | |
47 | { | |
48 | if (lhs->tv_sec < rhs->tv_sec) | |
49 | return -1; | |
50 | if (lhs->tv_sec > rhs->tv_sec) | |
51 | return 1; | |
52 | return lhs->tv_nsec - rhs->tv_nsec; | |
53 | } | |
54 | ||
55 | static inline int timeval_compare(struct timeval *lhs, struct timeval *rhs) | |
56 | { | |
57 | if (lhs->tv_sec < rhs->tv_sec) | |
58 | return -1; | |
59 | if (lhs->tv_sec > rhs->tv_sec) | |
60 | return 1; | |
61 | return lhs->tv_usec - rhs->tv_usec; | |
62 | } | |
63 | ||
f4818900 IM |
64 | extern unsigned long mktime(const unsigned int year, const unsigned int mon, |
65 | const unsigned int day, const unsigned int hour, | |
66 | const unsigned int min, const unsigned int sec); | |
67 | ||
68 | extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec); | |
1da177e4 | 69 | |
5f82b2b7 TG |
70 | /* |
71 | * Returns true if the timespec is norm, false if denorm: | |
72 | */ | |
73 | #define timespec_valid(ts) \ | |
bd3f8f2b | 74 | (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC)) |
5f82b2b7 | 75 | |
f8f46da3 TG |
76 | /* |
77 | * 64-bit nanosec type. Large enough to span 292+ years in nanosecond | |
78 | * resolution. Ought to be enough for a while. | |
79 | */ | |
80 | typedef s64 nsec_t; | |
81 | ||
1da177e4 LT |
82 | extern struct timespec xtime; |
83 | extern struct timespec wall_to_monotonic; | |
84 | extern seqlock_t xtime_lock; | |
85 | ||
86 | static inline unsigned long get_seconds(void) | |
57a55875 | 87 | { |
1da177e4 LT |
88 | return xtime.tv_sec; |
89 | } | |
90 | ||
91 | struct timespec current_kernel_time(void); | |
92 | ||
57a55875 IM |
93 | #define CURRENT_TIME (current_kernel_time()) |
94 | #define CURRENT_TIME_SEC ((struct timespec) { xtime.tv_sec, 0 }) | |
1da177e4 LT |
95 | |
96 | extern void do_gettimeofday(struct timeval *tv); | |
97 | extern int do_settimeofday(struct timespec *tv); | |
98 | extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz); | |
becf8b5d | 99 | #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts) |
5590ff0d | 100 | extern long do_utimes(int dfd, char __user *filename, struct timeval *times); |
1da177e4 | 101 | struct itimerval; |
57a55875 IM |
102 | extern int do_setitimer(int which, struct itimerval *value, |
103 | struct itimerval *ovalue); | |
c08b8a49 | 104 | extern unsigned int alarm_setitimer(unsigned int seconds); |
1da177e4 | 105 | extern int do_getitimer(int which, struct itimerval *value); |
57a55875 | 106 | extern void getnstimeofday(struct timespec *tv); |
1da177e4 LT |
107 | |
108 | extern struct timespec timespec_trunc(struct timespec t, unsigned gran); | |
109 | ||
f8f46da3 TG |
110 | /** |
111 | * timespec_to_ns - Convert timespec to nanoseconds | |
112 | * @ts: pointer to the timespec variable to be converted | |
113 | * | |
114 | * Returns the scalar nanosecond representation of the timespec | |
115 | * parameter. | |
116 | */ | |
117 | static inline nsec_t timespec_to_ns(const struct timespec *ts) | |
118 | { | |
119 | return ((nsec_t) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; | |
120 | } | |
121 | ||
122 | /** | |
123 | * timeval_to_ns - Convert timeval to nanoseconds | |
124 | * @ts: pointer to the timeval variable to be converted | |
125 | * | |
126 | * Returns the scalar nanosecond representation of the timeval | |
127 | * parameter. | |
128 | */ | |
129 | static inline nsec_t timeval_to_ns(const struct timeval *tv) | |
130 | { | |
131 | return ((nsec_t) tv->tv_sec * NSEC_PER_SEC) + | |
132 | tv->tv_usec * NSEC_PER_USEC; | |
133 | } | |
134 | ||
135 | /** | |
136 | * ns_to_timespec - Convert nanoseconds to timespec | |
137 | * @nsec: the nanoseconds value to be converted | |
138 | * | |
139 | * Returns the timespec representation of the nsec parameter. | |
140 | */ | |
141 | extern struct timespec ns_to_timespec(const nsec_t nsec); | |
142 | ||
143 | /** | |
144 | * ns_to_timeval - Convert nanoseconds to timeval | |
145 | * @nsec: the nanoseconds value to be converted | |
146 | * | |
147 | * Returns the timeval representation of the nsec parameter. | |
148 | */ | |
149 | extern struct timeval ns_to_timeval(const nsec_t nsec); | |
150 | ||
1da177e4 LT |
151 | #endif /* __KERNEL__ */ |
152 | ||
153 | #define NFDBITS __NFDBITS | |
154 | ||
155 | #define FD_SETSIZE __FD_SETSIZE | |
156 | #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp) | |
157 | #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp) | |
158 | #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp) | |
159 | #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp) | |
160 | ||
161 | /* | |
162 | * Names of the interval timers, and structure | |
57a55875 | 163 | * defining a timer setting: |
1da177e4 | 164 | */ |
57a55875 IM |
165 | #define ITIMER_REAL 0 |
166 | #define ITIMER_VIRTUAL 1 | |
167 | #define ITIMER_PROF 2 | |
1da177e4 | 168 | |
57a55875 IM |
169 | struct itimerspec { |
170 | struct timespec it_interval; /* timer period */ | |
171 | struct timespec it_value; /* timer expiration */ | |
1da177e4 LT |
172 | }; |
173 | ||
57a55875 IM |
174 | struct itimerval { |
175 | struct timeval it_interval; /* timer interval */ | |
176 | struct timeval it_value; /* current value */ | |
1da177e4 LT |
177 | }; |
178 | ||
1da177e4 | 179 | /* |
57a55875 | 180 | * The IDs of the various system clocks (for POSIX.1b interval timers): |
1da177e4 | 181 | */ |
1ad106ca IM |
182 | #define CLOCK_REALTIME 0 |
183 | #define CLOCK_MONOTONIC 1 | |
184 | #define CLOCK_PROCESS_CPUTIME_ID 2 | |
185 | #define CLOCK_THREAD_CPUTIME_ID 3 | |
1da177e4 LT |
186 | |
187 | /* | |
57a55875 | 188 | * The IDs of various hardware clocks: |
1da177e4 | 189 | */ |
1ad106ca IM |
190 | #define CLOCK_SGI_CYCLE 10 |
191 | #define MAX_CLOCKS 16 | |
192 | #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC) | |
193 | #define CLOCKS_MONO CLOCK_MONOTONIC | |
1da177e4 LT |
194 | |
195 | /* | |
57a55875 | 196 | * The various flags for setting POSIX.1b interval timers: |
1da177e4 | 197 | */ |
1ad106ca | 198 | #define TIMER_ABSTIME 0x01 |
1da177e4 LT |
199 | |
200 | #endif |