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Re: [PATCH 3/6] y2038: Introduce struct __timeval64 - new internal glibc type
- From: Alistair Francis <alistair23 at gmail dot com>
- To: Lukasz Majewski <lukma at denx dot de>
- Cc: Joseph Myers <joseph at codesourcery dot com>, Paul Eggert <eggert at cs dot ucla dot edu>, Adhemerval Zanella <adhemerval dot zanella at linaro dot org>, Samuel Thibault <samuel dot thibault at ens-lyon dot org>, Alistair Francis <alistair dot francis at wdc dot com>, GNU C Library <libc-alpha at sourceware dot org>, Siddhesh Poyarekar <siddhesh at gotplt dot org>, Florian Weimer <fweimer at redhat dot com>, Florian Weimer <fw at deneb dot enyo dot de>, Zack Weinberg <zackw at panix dot com>, "Carlos O'Donell" <carlos at redhat dot com>, Andreas Schwab <schwab at suse dot de>
- Date: Sun, 19 Jan 2020 08:47:39 +1000
- Subject: Re: [PATCH 3/6] y2038: Introduce struct __timeval64 - new internal glibc type
- References: <20200118072047.23071-1-lukma@denx.de> <20200118072047.23071-4-lukma@denx.de>
On Sat, Jan 18, 2020 at 5:21 PM Lukasz Majewski <lukma@denx.de> wrote:
>
> This type is a glibc's "internal" type similar to struct timeval but
> whose tv_sec field is a __time64_t rather than a time_t, which makes it
> Y2038-proof. This struct is NOT supposed to be passed to the kernel -
> instead it shall be converted to struct __timespec64 and clock_[sg]ettime
> syscalls shall be used (which are now Y2038 safe).
>
> Build tests:
> ./src/scripts/build-many-glibcs.py glibcs
Looks good, I have the same thing in my tree :)
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Alistair
> ---
> include/time.h | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/include/time.h b/include/time.h
> index 047f431a1a..22ecacd0d8 100644
> --- a/include/time.h
> +++ b/include/time.h
> @@ -93,6 +93,20 @@ struct __itimerspec64
> };
> #endif
>
> +#if __TIMESIZE == 64
> +# define __timeval64 timeval
> +#else
> +/* The glibc Y2038-proof struct __timeval64 structure for a time value.
> + This structure is NOT supposed to be passed to the Linux kernel.
> + Instead, it shall be converted to struct __timespec64 and time shall
> + be [sg]et via clock_[sg]ettime (which are now Y2038 safe). */
> +struct __timeval64
> +{
> + __time64_t tv_sec; /* Seconds */
> + __suseconds_t tv_usec; /* Microseconds */
> +};
> +#endif
> +
> #if __TIMESIZE == 64
> # define __ctime64 ctime
> #else
> --
> 2.20.1
>