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.Dd September 10, 2014 .Dt TODR 9 .Os .Sh NAME .Nm todr_attach , .Nm todr_gettime , .Nm todr_settime , .Nm clock_ymdhms_to_secs , .Nm clock_secs_to_ymdhms .Nd time-of-day clock support .Sh SYNOPSIS n dev/clock_subr.h .Ft void .Fn todr_attach "todr_chip_handle_t" .Ft int .Fn todr_gettime "todr_chip_handle_t" "struct timeval *" .Ft int .Fn todr_settime "todr_chip_handle_t" "struct timeval *" .Ft int .Fn clock_secs_to_ymdhms "time_t" "struct clock_ymdhms *" .Ft time_t .Fn clock_ymdhms_to_secs "struct clock_ymdhms *" .Sh DESCRIPTION The .Fn todr_* functions provide an interface to read, set and control .Ql time-of-day devices. A driver for a .Ql time-of-day device registers its .Fa todr_chip_handle_t with machine-dependent code using the .Fn todr_attach function. Alternatively, a machine-dependent front-end to a .Ql time-of-day device driver may obtain the .Fa todr_chip_handle_t directly.
p The .Fn todr_gettime retrieves the current data and time from the TODR device and returns it in the .Fa struct timeval storage provided by the caller. .Fn todr_settime sets the date and time in the TODR device represented by .Fa todr_chip_handle_t according to the .Fa struct timeval argument.
p The utilities .Fn clock_secs_to_ymdhms and .Fn clock_ymdhms_to_secs are provided to convert a time value in seconds to and from a structure representing the date and time as a .Aq year,month,day,weekday,hour,minute,seconds tuple. This structure is defined as follows: d -literal struct clock_ymdhms { uint64_t 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) */ }; .Ed
p Note: leap years are recognised by these conversion routines. .Sh RETURN VALUES The .Fn todr_* functions return 0 if the requested operation was successful; otherwise an error code from n sys/errno.h shall be returned. However, behaviour is undefined if an invalid .Fa todr_chip_handle_t is passed to any of these functions.
p The .Fn clock_ymdhms_to_secs function returns -1 if the time in seconds would be less that zero or too large to fit in a .Fa time_t . The .Fn clock_secs_to_ymdhms function returns 0 on success or .Er EINVAL if the time passed is negative. .Sh SEE ALSO .Xr intersil7170 4 , .Xr mk48txx 4 , .Xr inittodr 9 , .Xr resettodr 9 , .Xr time_second 9
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