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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 | 30 | /* Parameters used to convert the timespec values: */ |
05ebb761 VP |
31 | #define MSEC_PER_SEC 1000L |
32 | #define USEC_PER_MSEC 1000L | |
33 | #define NSEC_PER_USEC 1000L | |
34 | #define NSEC_PER_MSEC 1000000L | |
35 | #define USEC_PER_SEC 1000000L | |
36 | #define NSEC_PER_SEC 1000000000L | |
37 | #define FSEC_PER_SEC 1000000000000000L | |
1da177e4 | 38 | |
5b78cc9a JE |
39 | static inline int timespec_equal(const struct timespec *a, |
40 | const struct timespec *b) | |
57a55875 | 41 | { |
1da177e4 | 42 | return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); |
57a55875 | 43 | } |
1da177e4 | 44 | |
643a6545 AM |
45 | /* |
46 | * lhs < rhs: return <0 | |
47 | * lhs == rhs: return 0 | |
48 | * lhs > rhs: return >0 | |
49 | */ | |
77adbfbf | 50 | static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs) |
643a6545 AM |
51 | { |
52 | if (lhs->tv_sec < rhs->tv_sec) | |
53 | return -1; | |
54 | if (lhs->tv_sec > rhs->tv_sec) | |
55 | return 1; | |
56 | return lhs->tv_nsec - rhs->tv_nsec; | |
57 | } | |
58 | ||
77adbfbf | 59 | static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs) |
643a6545 AM |
60 | { |
61 | if (lhs->tv_sec < rhs->tv_sec) | |
62 | return -1; | |
63 | if (lhs->tv_sec > rhs->tv_sec) | |
64 | return 1; | |
65 | return lhs->tv_usec - rhs->tv_usec; | |
66 | } | |
67 | ||
f4818900 IM |
68 | extern unsigned long mktime(const unsigned int year, const unsigned int mon, |
69 | const unsigned int day, const unsigned int hour, | |
70 | const unsigned int min, const unsigned int sec); | |
71 | ||
72 | extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec); | |
1da177e4 | 73 | |
ca74e92b SN |
74 | /* |
75 | * sub = lhs - rhs, in normalized form | |
76 | */ | |
77 | static inline struct timespec timespec_sub(struct timespec lhs, | |
78 | struct timespec rhs) | |
79 | { | |
80 | struct timespec ts_delta; | |
81 | set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec, | |
82 | lhs.tv_nsec - rhs.tv_nsec); | |
83 | return ts_delta; | |
84 | } | |
85 | ||
5f82b2b7 TG |
86 | /* |
87 | * Returns true if the timespec is norm, false if denorm: | |
88 | */ | |
89 | #define timespec_valid(ts) \ | |
bd3f8f2b | 90 | (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC)) |
5f82b2b7 | 91 | |
1da177e4 LT |
92 | extern struct timespec xtime; |
93 | extern struct timespec wall_to_monotonic; | |
5809f9d4 | 94 | extern seqlock_t xtime_lock __attribute__((weak)); |
1da177e4 | 95 | |
411187fb | 96 | extern unsigned long read_persistent_clock(void); |
ad596171 | 97 | void timekeeping_init(void); |
98 | ||
1da177e4 | 99 | static inline unsigned long get_seconds(void) |
57a55875 | 100 | { |
1da177e4 LT |
101 | return xtime.tv_sec; |
102 | } | |
103 | ||
104 | struct timespec current_kernel_time(void); | |
105 | ||
57a55875 IM |
106 | #define CURRENT_TIME (current_kernel_time()) |
107 | #define CURRENT_TIME_SEC ((struct timespec) { xtime.tv_sec, 0 }) | |
1da177e4 LT |
108 | |
109 | extern void do_gettimeofday(struct timeval *tv); | |
110 | extern int do_settimeofday(struct timespec *tv); | |
111 | extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz); | |
becf8b5d | 112 | #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts) |
1c710c89 | 113 | extern long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags); |
1da177e4 | 114 | struct itimerval; |
57a55875 IM |
115 | extern int do_setitimer(int which, struct itimerval *value, |
116 | struct itimerval *ovalue); | |
c08b8a49 | 117 | extern unsigned int alarm_setitimer(unsigned int seconds); |
1da177e4 | 118 | extern int do_getitimer(int which, struct itimerval *value); |
57a55875 | 119 | extern void getnstimeofday(struct timespec *tv); |
7c3f1a57 TJ |
120 | extern void getboottime(struct timespec *ts); |
121 | extern void monotonic_to_bootbased(struct timespec *ts); | |
1da177e4 LT |
122 | |
123 | extern struct timespec timespec_trunc(struct timespec t, unsigned gran); | |
cf3c769b | 124 | extern int timekeeping_is_continuous(void); |
8524070b | 125 | extern void update_wall_time(void); |
1da177e4 | 126 | |
f8f46da3 TG |
127 | /** |
128 | * timespec_to_ns - Convert timespec to nanoseconds | |
129 | * @ts: pointer to the timespec variable to be converted | |
130 | * | |
131 | * Returns the scalar nanosecond representation of the timespec | |
132 | * parameter. | |
133 | */ | |
df869b63 | 134 | static inline s64 timespec_to_ns(const struct timespec *ts) |
f8f46da3 | 135 | { |
df869b63 | 136 | return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; |
f8f46da3 TG |
137 | } |
138 | ||
139 | /** | |
140 | * timeval_to_ns - Convert timeval to nanoseconds | |
141 | * @ts: pointer to the timeval variable to be converted | |
142 | * | |
143 | * Returns the scalar nanosecond representation of the timeval | |
144 | * parameter. | |
145 | */ | |
df869b63 | 146 | static inline s64 timeval_to_ns(const struct timeval *tv) |
f8f46da3 | 147 | { |
df869b63 | 148 | return ((s64) tv->tv_sec * NSEC_PER_SEC) + |
f8f46da3 TG |
149 | tv->tv_usec * NSEC_PER_USEC; |
150 | } | |
151 | ||
152 | /** | |
153 | * ns_to_timespec - Convert nanoseconds to timespec | |
154 | * @nsec: the nanoseconds value to be converted | |
155 | * | |
156 | * Returns the timespec representation of the nsec parameter. | |
157 | */ | |
df869b63 | 158 | extern struct timespec ns_to_timespec(const s64 nsec); |
f8f46da3 TG |
159 | |
160 | /** | |
161 | * ns_to_timeval - Convert nanoseconds to timeval | |
162 | * @nsec: the nanoseconds value to be converted | |
163 | * | |
164 | * Returns the timeval representation of the nsec parameter. | |
165 | */ | |
df869b63 | 166 | extern struct timeval ns_to_timeval(const s64 nsec); |
f8f46da3 | 167 | |
cf3c769b | 168 | /** |
169 | * timespec_add_ns - Adds nanoseconds to a timespec | |
170 | * @a: pointer to timespec to be incremented | |
171 | * @ns: unsigned nanoseconds value to be added | |
172 | */ | |
173 | static inline void timespec_add_ns(struct timespec *a, u64 ns) | |
174 | { | |
175 | ns += a->tv_nsec; | |
176 | while(unlikely(ns >= NSEC_PER_SEC)) { | |
177 | ns -= NSEC_PER_SEC; | |
178 | a->tv_sec++; | |
179 | } | |
180 | a->tv_nsec = ns; | |
181 | } | |
1da177e4 LT |
182 | #endif /* __KERNEL__ */ |
183 | ||
184 | #define NFDBITS __NFDBITS | |
185 | ||
186 | #define FD_SETSIZE __FD_SETSIZE | |
187 | #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp) | |
188 | #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp) | |
189 | #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp) | |
190 | #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp) | |
191 | ||
192 | /* | |
193 | * Names of the interval timers, and structure | |
57a55875 | 194 | * defining a timer setting: |
1da177e4 | 195 | */ |
57a55875 IM |
196 | #define ITIMER_REAL 0 |
197 | #define ITIMER_VIRTUAL 1 | |
198 | #define ITIMER_PROF 2 | |
1da177e4 | 199 | |
57a55875 IM |
200 | struct itimerspec { |
201 | struct timespec it_interval; /* timer period */ | |
202 | struct timespec it_value; /* timer expiration */ | |
1da177e4 LT |
203 | }; |
204 | ||
57a55875 IM |
205 | struct itimerval { |
206 | struct timeval it_interval; /* timer interval */ | |
207 | struct timeval it_value; /* current value */ | |
1da177e4 LT |
208 | }; |
209 | ||
1da177e4 | 210 | /* |
57a55875 | 211 | * The IDs of the various system clocks (for POSIX.1b interval timers): |
1da177e4 | 212 | */ |
1ad106ca IM |
213 | #define CLOCK_REALTIME 0 |
214 | #define CLOCK_MONOTONIC 1 | |
215 | #define CLOCK_PROCESS_CPUTIME_ID 2 | |
216 | #define CLOCK_THREAD_CPUTIME_ID 3 | |
1da177e4 LT |
217 | |
218 | /* | |
57a55875 | 219 | * The IDs of various hardware clocks: |
1da177e4 | 220 | */ |
1ad106ca IM |
221 | #define CLOCK_SGI_CYCLE 10 |
222 | #define MAX_CLOCKS 16 | |
223 | #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC) | |
224 | #define CLOCKS_MONO CLOCK_MONOTONIC | |
1da177e4 LT |
225 | |
226 | /* | |
57a55875 | 227 | * The various flags for setting POSIX.1b interval timers: |
1da177e4 | 228 | */ |
1ad106ca | 229 | #define TIMER_ABSTIME 0x01 |
1da177e4 LT |
230 | |
231 | #endif |