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TODR(9) BSD Kernel Developer's Manual TODR(9)
NAME
todr_attach, todr_gettime, todr_settime, clock_ymdhms_to_secs, clock_secs_to_ymdhms -- time-of-day clock support
SYNOPSIS
#include <dev/clock_subr.h>
void
todr_attach(todr_chip_handle_t);
int
todr_gettime(todr_chip_handle_t, struct timeval *);
int
todr_settime(todr_chip_handle_t, struct timeval *);
void
clock_secs_to_ymdhms(int, struct clock_ymdhms *);
time_t
clock_ymdhms_to_secs(struct clock_ymdhms *);
DESCRIPTION
The todr_*() functions provide an interface to read, set and control 'time-of-day' devices. A driver for a 'time-of-day' device registers
its todr_chip_handle_t with machine-dependent code using the todr_attach() function. Alternatively, a machine-dependent front-end to a
'time-of-day' device driver may obtain the todr_chip_handle_t directly.
The todr_gettime() retrieves the current data and time from the TODR device and returns it in the struct timeval storage provided by the
caller. todr_settime() sets the date and time in the TODR device represented by todr_chip_handle_t according to the struct timeval argument.
The utilities clock_secs_to_ymdhms() and clock_ymdhms_to_secs() are provided to convert a time value in seconds to and from a structure rep-
resenting the date and time as a <year,month,day,weekday,hour,minute,seconds> tuple. This structure is defined as follows:
struct clock_ymdhms {
u_short dt_year; /* Year */
u_char dt_mon; /* Month (1-12) */
u_char dt_day; /* Day (1-31) */
u_char dt_wday; /* Day of week (0-6) */
u_char dt_hour; /* Hour (0-23) */
u_char dt_min; /* Minute (0-59) */
u_char dt_sec; /* Second (0-59) */
};
Note: leap years are recognised by these conversion routines.
RETURN VALUES
The todr_*() functions return 0 if the requested operation was successful; otherwise an error code from <sys/errno.h> shall be returned.
However, behaviour is undefined if an invalid todr_chip_handle_t is passed to any of these functions.
The clock_ymdhms_to_secs() function returns -1 if the time in seconds would be less that zero or too large to fit in a time_t. The
clock_secs_to_ymdhms() function never fails.
SEE ALSO
intersil7170(4), mk48txx(4), inittodr(9), resettodr(9), time_second(9)
BSD
September 6, 2006 BSD