1 #ifndef _LINUX_TIME_H
2 #define _LINUX_TIME_H
3
4 #include <linux/types.h>
5
6 #ifdef __KERNEL__
7 # include <linux/cache.h>
8 # include <linux/seqlock.h>
9 # include <linux/math64.h>
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 };
18 #endif
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
32 extern struct timezone sys_tz;
33
34 /* Parameters used to convert the timespec values: */
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
42
43 #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
44
timespec_equal(const struct timespec * a,const struct timespec * b)45 static inline int timespec_equal(const struct timespec *a,
46 const struct timespec *b)
47 {
48 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
49 }
50
51 /*
52 * lhs < rhs: return <0
53 * lhs == rhs: return 0
54 * lhs > rhs: return >0
55 */
timespec_compare(const struct timespec * lhs,const struct timespec * rhs)56 static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
57 {
58 if (lhs->tv_sec < rhs->tv_sec)
59 return -1;
60 if (lhs->tv_sec > rhs->tv_sec)
61 return 1;
62 return lhs->tv_nsec - rhs->tv_nsec;
63 }
64
timeval_compare(const struct timeval * lhs,const struct timeval * rhs)65 static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
66 {
67 if (lhs->tv_sec < rhs->tv_sec)
68 return -1;
69 if (lhs->tv_sec > rhs->tv_sec)
70 return 1;
71 return lhs->tv_usec - rhs->tv_usec;
72 }
73
74 extern unsigned long mktime(const unsigned int year, const unsigned int mon,
75 const unsigned int day, const unsigned int hour,
76 const unsigned int min, const unsigned int sec);
77
78 extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec);
79 extern struct timespec timespec_add_safe(const struct timespec lhs,
80 const struct timespec rhs);
81
82 /*
83 * sub = lhs - rhs, in normalized form
84 */
timespec_sub(struct timespec lhs,struct timespec rhs)85 static inline struct timespec timespec_sub(struct timespec lhs,
86 struct timespec rhs)
87 {
88 struct timespec ts_delta;
89 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
90 lhs.tv_nsec - rhs.tv_nsec);
91 return ts_delta;
92 }
93
94 /*
95 * Returns true if the timespec is norm, false if denorm:
96 */
97 #define timespec_valid(ts) \
98 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
99
100 extern struct timespec xtime;
101 extern struct timespec wall_to_monotonic;
102 extern seqlock_t xtime_lock;
103
104 extern unsigned long read_persistent_clock(void);
105 extern int update_persistent_clock(struct timespec now);
106 extern int no_sync_cmos_clock __read_mostly;
107 void timekeeping_init(void);
108 extern int timekeeping_suspended;
109
110 unsigned long get_seconds(void);
111 struct timespec current_kernel_time(void);
112
113 #define CURRENT_TIME (current_kernel_time())
114 #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
115
116 extern void do_gettimeofday(struct timeval *tv);
117 extern int do_settimeofday(struct timespec *tv);
118 extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz);
119 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
120 extern long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags);
121 struct itimerval;
122 extern int do_setitimer(int which, struct itimerval *value,
123 struct itimerval *ovalue);
124 extern unsigned int alarm_setitimer(unsigned int seconds);
125 extern int do_getitimer(int which, struct itimerval *value);
126 extern void getnstimeofday(struct timespec *tv);
127 extern void getrawmonotonic(struct timespec *ts);
128 extern void getboottime(struct timespec *ts);
129 extern void monotonic_to_bootbased(struct timespec *ts);
130
131 extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
132 extern int timekeeping_valid_for_hres(void);
133 extern void update_wall_time(void);
134 extern void update_xtime_cache(u64 nsec);
135
136 struct tms;
137 extern void do_sys_times(struct tms *);
138
139 /**
140 * timespec_to_ns - Convert timespec to nanoseconds
141 * @ts: pointer to the timespec variable to be converted
142 *
143 * Returns the scalar nanosecond representation of the timespec
144 * parameter.
145 */
timespec_to_ns(const struct timespec * ts)146 static inline s64 timespec_to_ns(const struct timespec *ts)
147 {
148 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
149 }
150
151 /**
152 * timeval_to_ns - Convert timeval to nanoseconds
153 * @ts: pointer to the timeval variable to be converted
154 *
155 * Returns the scalar nanosecond representation of the timeval
156 * parameter.
157 */
timeval_to_ns(const struct timeval * tv)158 static inline s64 timeval_to_ns(const struct timeval *tv)
159 {
160 return ((s64) tv->tv_sec * NSEC_PER_SEC) +
161 tv->tv_usec * NSEC_PER_USEC;
162 }
163
164 /**
165 * ns_to_timespec - Convert nanoseconds to timespec
166 * @nsec: the nanoseconds value to be converted
167 *
168 * Returns the timespec representation of the nsec parameter.
169 */
170 extern struct timespec ns_to_timespec(const s64 nsec);
171
172 /**
173 * ns_to_timeval - Convert nanoseconds to timeval
174 * @nsec: the nanoseconds value to be converted
175 *
176 * Returns the timeval representation of the nsec parameter.
177 */
178 extern struct timeval ns_to_timeval(const s64 nsec);
179
180 /**
181 * timespec_add_ns - Adds nanoseconds to a timespec
182 * @a: pointer to timespec to be incremented
183 * @ns: unsigned nanoseconds value to be added
184 *
185 * This must always be inlined because its used from the x86-64 vdso,
186 * which cannot call other kernel functions.
187 */
timespec_add_ns(struct timespec * a,u64 ns)188 static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
189 {
190 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
191 a->tv_nsec = ns;
192 }
193 #endif /* __KERNEL__ */
194
195 #define NFDBITS __NFDBITS
196
197 #define FD_SETSIZE __FD_SETSIZE
198 #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
199 #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
200 #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
201 #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
202
203 /*
204 * Names of the interval timers, and structure
205 * defining a timer setting:
206 */
207 #define ITIMER_REAL 0
208 #define ITIMER_VIRTUAL 1
209 #define ITIMER_PROF 2
210
211 struct itimerspec {
212 struct timespec it_interval; /* timer period */
213 struct timespec it_value; /* timer expiration */
214 };
215
216 struct itimerval {
217 struct timeval it_interval; /* timer interval */
218 struct timeval it_value; /* current value */
219 };
220
221 /*
222 * The IDs of the various system clocks (for POSIX.1b interval timers):
223 */
224 #define CLOCK_REALTIME 0
225 #define CLOCK_MONOTONIC 1
226 #define CLOCK_PROCESS_CPUTIME_ID 2
227 #define CLOCK_THREAD_CPUTIME_ID 3
228 #define CLOCK_MONOTONIC_RAW 4
229
230 /*
231 * The IDs of various hardware clocks:
232 */
233 #define CLOCK_SGI_CYCLE 10
234 #define MAX_CLOCKS 16
235 #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
236 #define CLOCKS_MONO CLOCK_MONOTONIC
237
238 /*
239 * The various flags for setting POSIX.1b interval timers:
240 */
241 #define TIMER_ABSTIME 0x01
242
243 #endif
244