headers/private/kernel/real_time_clock.h

   1 /*
   2  * Copyright 2006-2007, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
   3  * Copyright 2003, Jeff Ward, jeff@r2d2.stcloudstate.edu. All rights reserved.
   4  *
   5  * Distributed under the terms of the MIT License.
   6  */
   7 #ifndef _KERNEL_REAL_TIME_CLOCK_H
   8 #define _KERNEL_REAL_TIME_CLOCK_H
   9
  10
  11 #include <KernelExport.h>
  12
  13 #include <time.h>
  14
  15
  16 struct kernel_args;
  17
  18
  19 #define RTC_EPOCH_BASE_YEAR     1970
  20
  21 #ifdef __cplusplus
  22 extern "C" {
  23 #endif
  24
  25 void set_real_time_clock_usecs(bigtime_t currentTime);
  26
  27 status_t rtc_init(struct kernel_args *args);
  28 bigtime_t rtc_boot_time(void);
  29         // Returns the time at which the system was booted in microseconds since Jan 1, 1970 UTC.
  30
  31 // Both functions use the passed struct tm only partially
  32 // (no tm_wday, tm_yday, tm_isdst).
  33 uint32 rtc_tm_to_secs(const struct tm *t);
  34 void rtc_secs_to_tm(uint32 seconds, struct tm *t);
  35
  36 uint32 get_timezone_offset(void);
  37
  38 bigtime_t _user_system_time(void);
  39 status_t _user_set_real_time_clock(bigtime_t time);
  40 status_t _user_set_timezone(int32 timezoneOffset, const char *name,
  41                         size_t nameLength);
  42 status_t _user_get_timezone(int32 *_timezoneOffset, char* name,
  43                         size_t nameLength);
  44 status_t _user_set_real_time_clock_is_gmt(bool isGMT);
  45 status_t _user_get_real_time_clock_is_gmt(bool *_isGMT);
  46
  47 #ifdef __cplusplus
  48 }
  49 #endif
  50
  51 #endif /* _KERNEL_REAL_TIME_CLOCK_H */