[PATCH 03/10] y2038: Provide conversion helpers for struct __timex64

[Alistair Francis]

On Sun, Apr 26, 2020 at 6:31 AM Lukasz Majewski <lukma@denx.de> wrote:
>
> Those functions allow easy conversion between Y2038 safe, glibc internal
> struct __timex64 and struct timex.
>
> Those functions are put in Linux specific sys/timex.h file, as putting
> them into glibc's local include/time.h would cause build break on HURD as
> it doesn't support struct timex related syscalls.
>
> Build tests:
> ./src/scripts/build-many-glibcs.py glibcs

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

Alistair

> ---
>  sysdeps/unix/sysv/linux/include/sys/timex.h | 61 +++++++++++++++++++++
>  1 file changed, 61 insertions(+)
>
> diff --git a/sysdeps/unix/sysv/linux/include/sys/timex.h b/sysdeps/unix/sysv/linux/include/sys/timex.h
> index f25081639b..bab6b28920 100644
> --- a/sysdeps/unix/sysv/linux/include/sys/timex.h
> +++ b/sysdeps/unix/sysv/linux/include/sys/timex.h
> @@ -25,6 +25,7 @@
>
>  libc_hidden_proto (__adjtimex)
>
> +#  include <time.h>
>  #  include <struct___timeval64.h>
>  /* Local definition of 64 bit time supporting timex struct */
>  #  if __TIMESIZE == 64
> @@ -63,5 +64,65 @@ struct __timex64
>    int  :32; int  :32; int  :32;
>  };
>  #  endif
> +
> +/* Convert a known valid struct timex into a struct __timex64.  */
> +static inline struct __timex64
> +valid_timex_to_timex64 (const struct timex tx)
> +{
> +  struct __timex64 tx64;
> +
> +  tx64.modes = tx.modes;
> +  tx64.offset = tx.offset;
> +  tx64.freq = tx.freq;
> +  tx64.maxerror = tx.maxerror;
> +  tx64.esterror = tx.esterror;
> +  tx64.status = tx.status;
> +  tx64.constant = tx.constant;
> +  tx64.precision = tx.precision;
> +  tx64.tolerance = tx.tolerance;
> +  tx64.time = valid_timeval_to_timeval64 (tx.time);
> +  tx64.tick = tx.tick;
> +  tx64.ppsfreq = tx.ppsfreq;
> +  tx64.jitter = tx.jitter;
> +  tx64.shift = tx.shift;
> +  tx64.stabil = tx.stabil;
> +  tx64.jitcnt = tx.jitcnt;
> +  tx64.calcnt = tx.calcnt;
> +  tx64.errcnt = tx.errcnt;
> +  tx64.stbcnt = tx.stbcnt;
> +  tx64.tai = tx.tai;
> +
> +  return tx64;
> +}
> +
> +/* Convert a known valid struct __timex64 into a struct timex.  */
> +static inline struct timex
> +valid_timex64_to_timex (const struct __timex64 tx64)
> +{
> +  struct timex tx;
> +
> +  tx.modes = tx64.modes;
> +  tx.offset = tx64.offset;
> +  tx.freq = tx64.freq;
> +  tx.maxerror = tx64.maxerror;
> +  tx.esterror = tx64.esterror;
> +  tx.status = tx64.status;
> +  tx.constant = tx64.constant;
> +  tx.precision = tx64.precision;
> +  tx.tolerance = tx64.tolerance;
> +  tx.time = valid_timeval64_to_timeval (tx64.time);
> +  tx.tick = tx64.tick;
> +  tx.ppsfreq = tx64.ppsfreq;
> +  tx.jitter = tx64.jitter;
> +  tx.shift = tx64.shift;
> +  tx.stabil = tx64.stabil;
> +  tx.jitcnt = tx64.jitcnt;
> +  tx.calcnt = tx64.calcnt;
> +  tx.errcnt = tx64.errcnt;
> +  tx.stbcnt = tx64.stbcnt;
> +  tx.tai = tx64.tai;
> +
> +  return tx;
> +}
>  # endif /* _ISOMAC */
>  #endif /* sys/timex.h */
> --
> 2.20.1
>