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1da177e4 LT |
1 | #ifndef _LINUX_TIME_H |
2 | #define _LINUX_TIME_H | |
3 | ||
82644459 | 4 | # include <linux/cache.h> |
57a55875 | 5 | # include <linux/seqlock.h> |
f595ec96 | 6 | # include <linux/math64.h> |
361a3bf0 | 7 | # include <linux/time64.h> |
1da177e4 | 8 | |
b418da16 CH |
9 | extern struct timezone sys_tz; |
10 | ||
df0cc053 TG |
11 | #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1) |
12 | ||
5b78cc9a JE |
13 | static inline int timespec_equal(const struct timespec *a, |
14 | const struct timespec *b) | |
57a55875 | 15 | { |
1da177e4 | 16 | return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); |
57a55875 | 17 | } |
1da177e4 | 18 | |
643a6545 AM |
19 | /* |
20 | * lhs < rhs: return <0 | |
21 | * lhs == rhs: return 0 | |
22 | * lhs > rhs: return >0 | |
23 | */ | |
77adbfbf | 24 | static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs) |
643a6545 AM |
25 | { |
26 | if (lhs->tv_sec < rhs->tv_sec) | |
27 | return -1; | |
28 | if (lhs->tv_sec > rhs->tv_sec) | |
29 | return 1; | |
30 | return lhs->tv_nsec - rhs->tv_nsec; | |
31 | } | |
32 | ||
77adbfbf | 33 | static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs) |
643a6545 AM |
34 | { |
35 | if (lhs->tv_sec < rhs->tv_sec) | |
36 | return -1; | |
37 | if (lhs->tv_sec > rhs->tv_sec) | |
38 | return 1; | |
39 | return lhs->tv_usec - rhs->tv_usec; | |
40 | } | |
41 | ||
90b6ce9c | 42 | extern time64_t mktime64(const unsigned int year, const unsigned int mon, |
43 | const unsigned int day, const unsigned int hour, | |
44 | const unsigned int min, const unsigned int sec); | |
45 | ||
46 | /** | |
47 | * Deprecated. Use mktime64(). | |
48 | */ | |
49 | static inline unsigned long mktime(const unsigned int year, | |
50 | const unsigned int mon, const unsigned int day, | |
51 | const unsigned int hour, const unsigned int min, | |
52 | const unsigned int sec) | |
53 | { | |
54 | return mktime64(year, mon, day, hour, min, sec); | |
55 | } | |
f4818900 | 56 | |
12e09337 | 57 | extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec); |
ce3bf7ab JS |
58 | |
59 | /* | |
60 | * timespec_add_safe assumes both values are positive and checks | |
61 | * for overflow. It will return TIME_T_MAX if the reutrn would be | |
62 | * smaller then either of the arguments. | |
63 | */ | |
df0cc053 TG |
64 | extern struct timespec timespec_add_safe(const struct timespec lhs, |
65 | const struct timespec rhs); | |
1da177e4 | 66 | |
ce3bf7ab JS |
67 | |
68 | static inline struct timespec timespec_add(struct timespec lhs, | |
69 | struct timespec rhs) | |
70 | { | |
71 | struct timespec ts_delta; | |
72 | set_normalized_timespec(&ts_delta, lhs.tv_sec + rhs.tv_sec, | |
73 | lhs.tv_nsec + rhs.tv_nsec); | |
74 | return ts_delta; | |
75 | } | |
76 | ||
ca74e92b SN |
77 | /* |
78 | * sub = lhs - rhs, in normalized form | |
79 | */ | |
80 | static inline struct timespec timespec_sub(struct timespec lhs, | |
81 | struct timespec rhs) | |
82 | { | |
83 | struct timespec ts_delta; | |
84 | set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec, | |
85 | lhs.tv_nsec - rhs.tv_nsec); | |
86 | return ts_delta; | |
87 | } | |
88 | ||
5f82b2b7 TG |
89 | /* |
90 | * Returns true if the timespec is norm, false if denorm: | |
91 | */ | |
4e8b1452 JS |
92 | static inline bool timespec_valid(const struct timespec *ts) |
93 | { | |
94 | /* Dates before 1970 are bogus */ | |
95 | if (ts->tv_sec < 0) | |
96 | return false; | |
97 | /* Can't have more nanoseconds then a second */ | |
98 | if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) | |
99 | return false; | |
cee58483 JS |
100 | return true; |
101 | } | |
102 | ||
103 | static inline bool timespec_valid_strict(const struct timespec *ts) | |
104 | { | |
105 | if (!timespec_valid(ts)) | |
106 | return false; | |
4e8b1452 JS |
107 | /* Disallow values that could overflow ktime_t */ |
108 | if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX) | |
109 | return false; | |
110 | return true; | |
111 | } | |
5f82b2b7 | 112 | |
6ada1fc0 SL |
113 | static inline bool timeval_valid(const struct timeval *tv) |
114 | { | |
115 | /* Dates before 1970 are bogus */ | |
116 | if (tv->tv_sec < 0) | |
117 | return false; | |
118 | ||
119 | /* Can't have more microseconds then a second */ | |
120 | if (tv->tv_usec < 0 || tv->tv_usec >= USEC_PER_SEC) | |
121 | return false; | |
122 | ||
123 | return true; | |
124 | } | |
125 | ||
8b094cd0 | 126 | extern struct timespec timespec_trunc(struct timespec t, unsigned gran); |
1da177e4 | 127 | |
37cf4dc3 JS |
128 | /* |
129 | * Validates if a timespec/timeval used to inject a time offset is valid. | |
130 | * Offsets can be postive or negative. The value of the timeval/timespec | |
131 | * is the sum of its fields, but *NOTE*: the field tv_usec/tv_nsec must | |
132 | * always be non-negative. | |
133 | */ | |
134 | static inline bool timeval_inject_offset_valid(const struct timeval *tv) | |
135 | { | |
136 | /* We don't check the tv_sec as it can be positive or negative */ | |
137 | ||
138 | /* Can't have more microseconds then a second */ | |
139 | if (tv->tv_usec < 0 || tv->tv_usec >= USEC_PER_SEC) | |
140 | return false; | |
141 | return true; | |
142 | } | |
143 | ||
144 | static inline bool timespec_inject_offset_valid(const struct timespec *ts) | |
145 | { | |
146 | /* We don't check the tv_sec as it can be positive or negative */ | |
147 | ||
148 | /* Can't have more nanoseconds then a second */ | |
149 | if (ts->tv_nsec < 0 || ts->tv_nsec >= NSEC_PER_SEC) | |
150 | return false; | |
151 | return true; | |
152 | } | |
153 | ||
57a55875 | 154 | #define CURRENT_TIME (current_kernel_time()) |
2c6b47de | 155 | #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 }) |
1da177e4 | 156 | |
7d27558c JS |
157 | /* Some architectures do not supply their own clocksource. |
158 | * This is mainly the case in architectures that get their | |
159 | * inter-tick times by reading the counter on their interval | |
160 | * timer. Since these timers wrap every tick, they're not really | |
161 | * useful as clocksources. Wrapping them to act like one is possible | |
162 | * but not very efficient. So we provide a callout these arches | |
163 | * can implement for use with the jiffies clocksource to provide | |
164 | * finer then tick granular time. | |
165 | */ | |
166 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET | |
7b1f6207 | 167 | extern u32 (*arch_gettimeoffset)(void); |
7d27558c JS |
168 | #endif |
169 | ||
1da177e4 | 170 | struct itimerval; |
57a55875 IM |
171 | extern int do_setitimer(int which, struct itimerval *value, |
172 | struct itimerval *ovalue); | |
1da177e4 | 173 | extern int do_getitimer(int which, struct itimerval *value); |
1da177e4 | 174 | |
8b094cd0 TG |
175 | extern unsigned int alarm_setitimer(unsigned int seconds); |
176 | ||
177 | extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags); | |
1da177e4 | 178 | |
f06febc9 FM |
179 | struct tms; |
180 | extern void do_sys_times(struct tms *); | |
181 | ||
57f1f087 Z |
182 | /* |
183 | * Similar to the struct tm in userspace <time.h>, but it needs to be here so | |
184 | * that the kernel source is self contained. | |
185 | */ | |
186 | struct tm { | |
187 | /* | |
188 | * the number of seconds after the minute, normally in the range | |
189 | * 0 to 59, but can be up to 60 to allow for leap seconds | |
190 | */ | |
191 | int tm_sec; | |
192 | /* the number of minutes after the hour, in the range 0 to 59*/ | |
193 | int tm_min; | |
194 | /* the number of hours past midnight, in the range 0 to 23 */ | |
195 | int tm_hour; | |
196 | /* the day of the month, in the range 1 to 31 */ | |
197 | int tm_mday; | |
198 | /* the number of months since January, in the range 0 to 11 */ | |
199 | int tm_mon; | |
200 | /* the number of years since 1900 */ | |
201 | long tm_year; | |
202 | /* the number of days since Sunday, in the range 0 to 6 */ | |
203 | int tm_wday; | |
204 | /* the number of days since January 1, in the range 0 to 365 */ | |
205 | int tm_yday; | |
206 | }; | |
207 | ||
208 | void time_to_tm(time_t totalsecs, int offset, struct tm *result); | |
209 | ||
f8f46da3 TG |
210 | /** |
211 | * timespec_to_ns - Convert timespec to nanoseconds | |
212 | * @ts: pointer to the timespec variable to be converted | |
213 | * | |
214 | * Returns the scalar nanosecond representation of the timespec | |
215 | * parameter. | |
216 | */ | |
df869b63 | 217 | static inline s64 timespec_to_ns(const struct timespec *ts) |
f8f46da3 | 218 | { |
df869b63 | 219 | return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; |
f8f46da3 TG |
220 | } |
221 | ||
222 | /** | |
223 | * timeval_to_ns - Convert timeval to nanoseconds | |
224 | * @ts: pointer to the timeval variable to be converted | |
225 | * | |
226 | * Returns the scalar nanosecond representation of the timeval | |
227 | * parameter. | |
228 | */ | |
df869b63 | 229 | static inline s64 timeval_to_ns(const struct timeval *tv) |
f8f46da3 | 230 | { |
df869b63 | 231 | return ((s64) tv->tv_sec * NSEC_PER_SEC) + |
f8f46da3 TG |
232 | tv->tv_usec * NSEC_PER_USEC; |
233 | } | |
234 | ||
235 | /** | |
236 | * ns_to_timespec - Convert nanoseconds to timespec | |
237 | * @nsec: the nanoseconds value to be converted | |
238 | * | |
239 | * Returns the timespec representation of the nsec parameter. | |
240 | */ | |
df869b63 | 241 | extern struct timespec ns_to_timespec(const s64 nsec); |
f8f46da3 TG |
242 | |
243 | /** | |
244 | * ns_to_timeval - Convert nanoseconds to timeval | |
245 | * @nsec: the nanoseconds value to be converted | |
246 | * | |
247 | * Returns the timeval representation of the nsec parameter. | |
248 | */ | |
df869b63 | 249 | extern struct timeval ns_to_timeval(const s64 nsec); |
f8f46da3 | 250 | |
cf3c769b JS |
251 | /** |
252 | * timespec_add_ns - Adds nanoseconds to a timespec | |
253 | * @a: pointer to timespec to be incremented | |
254 | * @ns: unsigned nanoseconds value to be added | |
9412e286 JF |
255 | * |
256 | * This must always be inlined because its used from the x86-64 vdso, | |
257 | * which cannot call other kernel functions. | |
cf3c769b | 258 | */ |
9412e286 | 259 | static __always_inline void timespec_add_ns(struct timespec *a, u64 ns) |
cf3c769b | 260 | { |
9412e286 | 261 | a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); |
cf3c769b JS |
262 | a->tv_nsec = ns; |
263 | } | |
8b3d1cda | 264 | |
1da177e4 | 265 | #endif |