Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | #ifndef _LINUX_TIME_H |
2 | #define _LINUX_TIME_H | |
3 | ||
4 | #include <linux/types.h> | |
5 | ||
6 | #ifdef __KERNEL__ | |
82644459 | 7 | # include <linux/cache.h> |
57a55875 | 8 | # include <linux/seqlock.h> |
f595ec96 | 9 | # include <linux/math64.h> |
1da177e4 LT |
10 | #endif |
11 | ||
12 | #ifndef _STRUCT_TIMESPEC | |
13 | #define _STRUCT_TIMESPEC | |
14 | struct timespec { | |
15 | time_t tv_sec; /* seconds */ | |
16 | long tv_nsec; /* nanoseconds */ | |
17 | }; | |
57a55875 | 18 | #endif |
1da177e4 LT |
19 | |
20 | struct timeval { | |
21 | time_t tv_sec; /* seconds */ | |
22 | suseconds_t tv_usec; /* microseconds */ | |
23 | }; | |
24 | ||
25 | struct timezone { | |
26 | int tz_minuteswest; /* minutes west of Greenwich */ | |
27 | int tz_dsttime; /* type of dst correction */ | |
28 | }; | |
29 | ||
30 | #ifdef __KERNEL__ | |
31 | ||
b418da16 CH |
32 | extern struct timezone sys_tz; |
33 | ||
57a55875 | 34 | /* Parameters used to convert the timespec values: */ |
05ebb761 VP |
35 | #define MSEC_PER_SEC 1000L |
36 | #define USEC_PER_MSEC 1000L | |
37 | #define NSEC_PER_USEC 1000L | |
38 | #define NSEC_PER_MSEC 1000000L | |
39 | #define USEC_PER_SEC 1000000L | |
40 | #define NSEC_PER_SEC 1000000000L | |
41 | #define FSEC_PER_SEC 1000000000000000L | |
1da177e4 | 42 | |
5b78cc9a JE |
43 | static inline int timespec_equal(const struct timespec *a, |
44 | const struct timespec *b) | |
57a55875 | 45 | { |
1da177e4 | 46 | return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); |
57a55875 | 47 | } |
1da177e4 | 48 | |
643a6545 AM |
49 | /* |
50 | * lhs < rhs: return <0 | |
51 | * lhs == rhs: return 0 | |
52 | * lhs > rhs: return >0 | |
53 | */ | |
77adbfbf | 54 | static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs) |
643a6545 AM |
55 | { |
56 | if (lhs->tv_sec < rhs->tv_sec) | |
57 | return -1; | |
58 | if (lhs->tv_sec > rhs->tv_sec) | |
59 | return 1; | |
60 | return lhs->tv_nsec - rhs->tv_nsec; | |
61 | } | |
62 | ||
77adbfbf | 63 | static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs) |
643a6545 AM |
64 | { |
65 | if (lhs->tv_sec < rhs->tv_sec) | |
66 | return -1; | |
67 | if (lhs->tv_sec > rhs->tv_sec) | |
68 | return 1; | |
69 | return lhs->tv_usec - rhs->tv_usec; | |
70 | } | |
71 | ||
f4818900 IM |
72 | extern unsigned long mktime(const unsigned int year, const unsigned int mon, |
73 | const unsigned int day, const unsigned int hour, | |
74 | const unsigned int min, const unsigned int sec); | |
75 | ||
76 | extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec); | |
1da177e4 | 77 | |
ca74e92b SN |
78 | /* |
79 | * sub = lhs - rhs, in normalized form | |
80 | */ | |
81 | static inline struct timespec timespec_sub(struct timespec lhs, | |
82 | struct timespec rhs) | |
83 | { | |
84 | struct timespec ts_delta; | |
85 | set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec, | |
86 | lhs.tv_nsec - rhs.tv_nsec); | |
87 | return ts_delta; | |
88 | } | |
89 | ||
5f82b2b7 TG |
90 | /* |
91 | * Returns true if the timespec is norm, false if denorm: | |
92 | */ | |
93 | #define timespec_valid(ts) \ | |
bd3f8f2b | 94 | (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC)) |
5f82b2b7 | 95 | |
1da177e4 LT |
96 | extern struct timespec xtime; |
97 | extern struct timespec wall_to_monotonic; | |
ba2a631b | 98 | extern seqlock_t xtime_lock; |
1da177e4 | 99 | |
411187fb | 100 | extern unsigned long read_persistent_clock(void); |
82644459 TG |
101 | extern int update_persistent_clock(struct timespec now); |
102 | extern int no_sync_cmos_clock __read_mostly; | |
ad596171 | 103 | void timekeeping_init(void); |
104 | ||
17c38b74 | 105 | unsigned long get_seconds(void); |
1da177e4 LT |
106 | struct timespec current_kernel_time(void); |
107 | ||
57a55875 | 108 | #define CURRENT_TIME (current_kernel_time()) |
2c6b47de | 109 | #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 }) |
1da177e4 LT |
110 | |
111 | extern void do_gettimeofday(struct timeval *tv); | |
112 | extern int do_settimeofday(struct timespec *tv); | |
113 | extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz); | |
becf8b5d | 114 | #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts) |
1c710c89 | 115 | extern long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags); |
1da177e4 | 116 | struct itimerval; |
57a55875 IM |
117 | extern int do_setitimer(int which, struct itimerval *value, |
118 | struct itimerval *ovalue); | |
c08b8a49 | 119 | extern unsigned int alarm_setitimer(unsigned int seconds); |
1da177e4 | 120 | extern int do_getitimer(int which, struct itimerval *value); |
57a55875 | 121 | extern void getnstimeofday(struct timespec *tv); |
7c3f1a57 TJ |
122 | extern void getboottime(struct timespec *ts); |
123 | extern void monotonic_to_bootbased(struct timespec *ts); | |
1da177e4 LT |
124 | |
125 | extern struct timespec timespec_trunc(struct timespec t, unsigned gran); | |
cf4fc6cb | 126 | extern int timekeeping_valid_for_hres(void); |
8524070b | 127 | extern void update_wall_time(void); |
1001d0a9 | 128 | extern void update_xtime_cache(u64 nsec); |
1da177e4 | 129 | |
f8f46da3 TG |
130 | /** |
131 | * timespec_to_ns - Convert timespec to nanoseconds | |
132 | * @ts: pointer to the timespec variable to be converted | |
133 | * | |
134 | * Returns the scalar nanosecond representation of the timespec | |
135 | * parameter. | |
136 | */ | |
df869b63 | 137 | static inline s64 timespec_to_ns(const struct timespec *ts) |
f8f46da3 | 138 | { |
df869b63 | 139 | return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; |
f8f46da3 TG |
140 | } |
141 | ||
142 | /** | |
143 | * timeval_to_ns - Convert timeval to nanoseconds | |
144 | * @ts: pointer to the timeval variable to be converted | |
145 | * | |
146 | * Returns the scalar nanosecond representation of the timeval | |
147 | * parameter. | |
148 | */ | |
df869b63 | 149 | static inline s64 timeval_to_ns(const struct timeval *tv) |
f8f46da3 | 150 | { |
df869b63 | 151 | return ((s64) tv->tv_sec * NSEC_PER_SEC) + |
f8f46da3 TG |
152 | tv->tv_usec * NSEC_PER_USEC; |
153 | } | |
154 | ||
155 | /** | |
156 | * ns_to_timespec - Convert nanoseconds to timespec | |
157 | * @nsec: the nanoseconds value to be converted | |
158 | * | |
159 | * Returns the timespec representation of the nsec parameter. | |
160 | */ | |
df869b63 | 161 | extern struct timespec ns_to_timespec(const s64 nsec); |
f8f46da3 TG |
162 | |
163 | /** | |
164 | * ns_to_timeval - Convert nanoseconds to timeval | |
165 | * @nsec: the nanoseconds value to be converted | |
166 | * | |
167 | * Returns the timeval representation of the nsec parameter. | |
168 | */ | |
df869b63 | 169 | extern struct timeval ns_to_timeval(const s64 nsec); |
f8f46da3 | 170 | |
cf3c769b | 171 | /** |
172 | * timespec_add_ns - Adds nanoseconds to a timespec | |
173 | * @a: pointer to timespec to be incremented | |
174 | * @ns: unsigned nanoseconds value to be added | |
9412e286 JF |
175 | * |
176 | * This must always be inlined because its used from the x86-64 vdso, | |
177 | * which cannot call other kernel functions. | |
cf3c769b | 178 | */ |
9412e286 | 179 | static __always_inline void timespec_add_ns(struct timespec *a, u64 ns) |
cf3c769b | 180 | { |
9412e286 | 181 | a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); |
cf3c769b | 182 | a->tv_nsec = ns; |
183 | } | |
1da177e4 LT |
184 | #endif /* __KERNEL__ */ |
185 | ||
186 | #define NFDBITS __NFDBITS | |
187 | ||
188 | #define FD_SETSIZE __FD_SETSIZE | |
189 | #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp) | |
190 | #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp) | |
191 | #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp) | |
192 | #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp) | |
193 | ||
194 | /* | |
195 | * Names of the interval timers, and structure | |
57a55875 | 196 | * defining a timer setting: |
1da177e4 | 197 | */ |
57a55875 IM |
198 | #define ITIMER_REAL 0 |
199 | #define ITIMER_VIRTUAL 1 | |
200 | #define ITIMER_PROF 2 | |
1da177e4 | 201 | |
57a55875 IM |
202 | struct itimerspec { |
203 | struct timespec it_interval; /* timer period */ | |
204 | struct timespec it_value; /* timer expiration */ | |
1da177e4 LT |
205 | }; |
206 | ||
57a55875 IM |
207 | struct itimerval { |
208 | struct timeval it_interval; /* timer interval */ | |
209 | struct timeval it_value; /* current value */ | |
1da177e4 LT |
210 | }; |
211 | ||
1da177e4 | 212 | /* |
57a55875 | 213 | * The IDs of the various system clocks (for POSIX.1b interval timers): |
1da177e4 | 214 | */ |
1ad106ca IM |
215 | #define CLOCK_REALTIME 0 |
216 | #define CLOCK_MONOTONIC 1 | |
217 | #define CLOCK_PROCESS_CPUTIME_ID 2 | |
218 | #define CLOCK_THREAD_CPUTIME_ID 3 | |
1da177e4 LT |
219 | |
220 | /* | |
57a55875 | 221 | * The IDs of various hardware clocks: |
1da177e4 | 222 | */ |
1ad106ca IM |
223 | #define CLOCK_SGI_CYCLE 10 |
224 | #define MAX_CLOCKS 16 | |
225 | #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC) | |
226 | #define CLOCKS_MONO CLOCK_MONOTONIC | |
1da177e4 LT |
227 | |
228 | /* | |
57a55875 | 229 | * The various flags for setting POSIX.1b interval timers: |
1da177e4 | 230 | */ |
1ad106ca | 231 | #define TIMER_ABSTIME 0x01 |
1da177e4 LT |
232 | |
233 | #endif |