On Fri, Feb 24, 2012 at 12:30 PM, Grant Edwards
<grant.b.edwa...@gmail.com>wrote:
> On 2012-02-24, Peter Bigot <big...@acm.org> wrote:
> > On Fri, Feb 24, 2012 at 10:09 AM, N. Coesel <n...@nctdev.nl> wrote:
>
>> A lot of devices do need to keep track of date & time. Instead of
> >> re-inventing the wheel its better to use a different (small) C
> >> library which has these functions and stay Posix compliant.
> >
> > Agreed; the underlying function might have to be user-provided just
> > as putchar is for msp430-libc, but the API should be standard.
>
> I'm not sure I see the point of the extra layer. Are there other
> library functions besides gettimeofday() that would call the
> underlying, user-provided function-that-isnt-gettimeofday?
>
My point is that there is value in re-using the POSIX API including struct
timeval and gettimeofday/settimeofday, which have commonly understood and
documented semantics, rather than inventing a new time representation and
way to manipulate it. It may be that gettimeofday is the fundamental
function that must be user-provided. (Although clock_gettime() might be an
alternative to consider, especially since it's paired with clock_getres(),
which could be useful.)
Once you have gettimeofday with struct timeval, you can add
localtime/gmtime and struct tm, and then strftime, and you can interact
with your RTC with a well-known API.
Peter
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