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Rev | Author | Line No. | Line |
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4065 | Serge | 1 | #ifndef _LINUX_TIME_H |
2 | #define _LINUX_TIME_H |
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3 | |||
5270 | serge | 4 | # include |
5 | # include |
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4065 | Serge | 6 | # include |
5270 | serge | 7 | # include |
4065 | Serge | 8 | |
9 | extern struct timezone sys_tz; |
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10 | |||
11 | #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1) |
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12 | |||
13 | static inline int timespec_equal(const struct timespec *a, |
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14 | const struct timespec *b) |
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15 | { |
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16 | return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); |
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17 | } |
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18 | |||
19 | /* |
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20 | * lhs < rhs: return <0 |
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21 | * lhs == rhs: return 0 |
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22 | * lhs > rhs: return >0 |
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23 | */ |
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24 | static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs) |
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25 | { |
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26 | if (lhs->tv_sec < rhs->tv_sec) |
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27 | return -1; |
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28 | if (lhs->tv_sec > rhs->tv_sec) |
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29 | return 1; |
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30 | return lhs->tv_nsec - rhs->tv_nsec; |
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31 | } |
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32 | |||
33 | static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs) |
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34 | { |
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35 | if (lhs->tv_sec < rhs->tv_sec) |
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36 | return -1; |
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37 | if (lhs->tv_sec > rhs->tv_sec) |
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38 | return 1; |
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39 | return lhs->tv_usec - rhs->tv_usec; |
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40 | } |
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41 | |||
5270 | serge | 42 | extern time64_t mktime64(const unsigned int year, const unsigned int mon, |
6082 | serge | 43 | const unsigned int day, const unsigned int hour, |
44 | const unsigned int min, const unsigned int sec); |
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4065 | Serge | 45 | |
5270 | serge | 46 | /** |
47 | * Deprecated. Use mktime64(). |
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48 | */ |
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49 | static inline unsigned long mktime(const unsigned int year, |
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50 | const unsigned int mon, const unsigned int day, |
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51 | const unsigned int hour, const unsigned int min, |
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52 | const unsigned int sec) |
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53 | { |
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54 | return mktime64(year, mon, day, hour, min, sec); |
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55 | } |
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56 | |||
4065 | Serge | 57 | extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec); |
58 | |||
59 | /* |
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60 | * timespec_add_safe assumes both values are positive and checks |
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61 | * for overflow. It will return TIME_T_MAX if the reutrn would be |
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62 | * smaller then either of the arguments. |
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63 | */ |
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64 | extern struct timespec timespec_add_safe(const struct timespec lhs, |
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65 | const struct timespec rhs); |
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66 | |||
67 | |||
68 | static inline struct timespec timespec_add(struct timespec lhs, |
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69 | struct timespec rhs) |
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70 | { |
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71 | struct timespec ts_delta; |
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72 | set_normalized_timespec(&ts_delta, lhs.tv_sec + rhs.tv_sec, |
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73 | lhs.tv_nsec + rhs.tv_nsec); |
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74 | return ts_delta; |
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75 | } |
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76 | |||
77 | /* |
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78 | * sub = lhs - rhs, in normalized form |
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79 | */ |
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80 | static inline struct timespec timespec_sub(struct timespec lhs, |
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81 | struct timespec rhs) |
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82 | { |
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83 | struct timespec ts_delta; |
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84 | set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec, |
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85 | lhs.tv_nsec - rhs.tv_nsec); |
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86 | return ts_delta; |
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87 | } |
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88 | |||
89 | /* |
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90 | * Returns true if the timespec is norm, false if denorm: |
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91 | */ |
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92 | static inline bool timespec_valid(const struct timespec *ts) |
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93 | { |
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94 | /* Dates before 1970 are bogus */ |
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95 | if (ts->tv_sec < 0) |
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96 | return false; |
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97 | /* Can't have more nanoseconds then a second */ |
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98 | if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) |
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99 | return false; |
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100 | return true; |
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101 | } |
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102 | |||
103 | static inline bool timespec_valid_strict(const struct timespec *ts) |
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104 | { |
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105 | if (!timespec_valid(ts)) |
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106 | return false; |
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107 | /* Disallow values that could overflow ktime_t */ |
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108 | if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX) |
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109 | return false; |
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110 | return true; |
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111 | } |
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112 | |||
6082 | serge | 113 | static inline bool timeval_valid(const struct timeval *tv) |
114 | { |
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115 | /* Dates before 1970 are bogus */ |
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116 | if (tv->tv_sec < 0) |
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117 | return false; |
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118 | |||
119 | /* Can't have more microseconds then a second */ |
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120 | if (tv->tv_usec < 0 || tv->tv_usec >= USEC_PER_SEC) |
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121 | return false; |
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122 | |||
123 | return true; |
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124 | } |
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125 | |||
5270 | serge | 126 | extern struct timespec timespec_trunc(struct timespec t, unsigned gran); |
4065 | Serge | 127 | |
6934 | serge | 128 | /* |
129 | * Validates if a timespec/timeval used to inject a time offset is valid. |
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130 | * Offsets can be postive or negative. The value of the timeval/timespec |
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131 | * is the sum of its fields, but *NOTE*: the field tv_usec/tv_nsec must |
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132 | * always be non-negative. |
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133 | */ |
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134 | static inline bool timeval_inject_offset_valid(const struct timeval *tv) |
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135 | { |
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136 | /* We don't check the tv_sec as it can be positive or negative */ |
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137 | |||
138 | /* Can't have more microseconds then a second */ |
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139 | if (tv->tv_usec < 0 || tv->tv_usec >= USEC_PER_SEC) |
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140 | return false; |
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141 | return true; |
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142 | } |
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143 | |||
144 | static inline bool timespec_inject_offset_valid(const struct timespec *ts) |
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145 | { |
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146 | /* We don't check the tv_sec as it can be positive or negative */ |
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147 | |||
148 | /* Can't have more nanoseconds then a second */ |
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149 | if (ts->tv_nsec < 0 || ts->tv_nsec >= NSEC_PER_SEC) |
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150 | return false; |
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151 | return true; |
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152 | } |
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153 | |||
4065 | Serge | 154 | #define CURRENT_TIME (current_kernel_time()) |
155 | #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 }) |
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156 | |||
157 | /* Some architectures do not supply their own clocksource. |
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158 | * This is mainly the case in architectures that get their |
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159 | * inter-tick times by reading the counter on their interval |
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160 | * timer. Since these timers wrap every tick, they're not really |
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161 | * useful as clocksources. Wrapping them to act like one is possible |
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162 | * but not very efficient. So we provide a callout these arches |
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163 | * can implement for use with the jiffies clocksource to provide |
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164 | * finer then tick granular time. |
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165 | */ |
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166 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET |
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167 | extern u32 (*arch_gettimeoffset)(void); |
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168 | #endif |
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169 | |||
170 | struct itimerval; |
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171 | extern int do_setitimer(int which, struct itimerval *value, |
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172 | struct itimerval *ovalue); |
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173 | extern int do_getitimer(int which, struct itimerval *value); |
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174 | |||
5270 | serge | 175 | extern unsigned int alarm_setitimer(unsigned int seconds); |
4065 | Serge | 176 | |
5270 | serge | 177 | extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags); |
178 | |||
4065 | Serge | 179 | struct tms; |
180 | extern void do_sys_times(struct tms *); |
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181 | |||
182 | /* |
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183 | * Similar to the struct tm in userspace |
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184 | * that the kernel source is self contained. |
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185 | */ |
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186 | struct tm { |
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187 | /* |
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188 | * the number of seconds after the minute, normally in the range |
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189 | * 0 to 59, but can be up to 60 to allow for leap seconds |
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190 | */ |
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191 | int tm_sec; |
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192 | /* the number of minutes after the hour, in the range 0 to 59*/ |
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193 | int tm_min; |
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194 | /* the number of hours past midnight, in the range 0 to 23 */ |
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195 | int tm_hour; |
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196 | /* the day of the month, in the range 1 to 31 */ |
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197 | int tm_mday; |
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198 | /* the number of months since January, in the range 0 to 11 */ |
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199 | int tm_mon; |
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200 | /* the number of years since 1900 */ |
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201 | long tm_year; |
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202 | /* the number of days since Sunday, in the range 0 to 6 */ |
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203 | int tm_wday; |
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204 | /* the number of days since January 1, in the range 0 to 365 */ |
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205 | int tm_yday; |
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206 | }; |
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207 | |||
208 | void time_to_tm(time_t totalsecs, int offset, struct tm *result); |
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209 | |||
210 | /** |
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211 | * timespec_to_ns - Convert timespec to nanoseconds |
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212 | * @ts: pointer to the timespec variable to be converted |
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213 | * |
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214 | * Returns the scalar nanosecond representation of the timespec |
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215 | * parameter. |
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216 | */ |
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217 | static inline s64 timespec_to_ns(const struct timespec *ts) |
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218 | { |
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219 | return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; |
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220 | } |
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221 | |||
222 | /** |
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223 | * timeval_to_ns - Convert timeval to nanoseconds |
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224 | * @ts: pointer to the timeval variable to be converted |
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225 | * |
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226 | * Returns the scalar nanosecond representation of the timeval |
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227 | * parameter. |
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228 | */ |
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229 | static inline s64 timeval_to_ns(const struct timeval *tv) |
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230 | { |
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231 | return ((s64) tv->tv_sec * NSEC_PER_SEC) + |
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232 | tv->tv_usec * NSEC_PER_USEC; |
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233 | } |
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234 | |||
235 | /** |
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236 | * ns_to_timespec - Convert nanoseconds to timespec |
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237 | * @nsec: the nanoseconds value to be converted |
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238 | * |
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239 | * Returns the timespec representation of the nsec parameter. |
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240 | */ |
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241 | extern struct timespec ns_to_timespec(const s64 nsec); |
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242 | |||
243 | /** |
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244 | * ns_to_timeval - Convert nanoseconds to timeval |
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245 | * @nsec: the nanoseconds value to be converted |
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246 | * |
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247 | * Returns the timeval representation of the nsec parameter. |
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248 | */ |
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249 | extern struct timeval ns_to_timeval(const s64 nsec); |
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250 | |||
251 | /** |
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252 | * timespec_add_ns - Adds nanoseconds to a timespec |
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253 | * @a: pointer to timespec to be incremented |
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254 | * @ns: unsigned nanoseconds value to be added |
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255 | * |
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256 | * This must always be inlined because its used from the x86-64 vdso, |
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257 | * which cannot call other kernel functions. |
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258 | */ |
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259 | static __always_inline void timespec_add_ns(struct timespec *a, u64 ns) |
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260 | { |
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261 | a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); |
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262 | a->tv_nsec = ns; |
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263 | } |
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264 | |||
265 | #endif>>>>>>>0 |