[PATCH v5 4/8] sysv: Define __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64

Fri Mar 27 18:36:04 GMT 2020

On Fri, Mar 27, 2020 at 10:58 AM Adhemerval Zanella via Libc-alpha
<libc-alpha@sourceware.org> wrote:
>
>
>
> On 03/03/2020 14:53, Alistair Francis wrote:
> > On y2038 safe 32-bit systems the Linux kernel expects itimerval
> > and rusage to use a 32-bit time_t, even though the other time_t's
> > are 64-bit.
>
> I think it worth to mention kernel does not intend to implement
> it and that timer_create should be used instead.

I haved added a sentence here.

>
> >
> > There are also other occurances where the time passed to the kernel via
>
> I think it is spelled 'occurrences'.

Fixed

>
> > timeval doesn't match the wordsize.
> >
> > To handle these cases let's define a new macro
> > __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64. This macro specifies if the
> > kernel's old_timeval matches the new timeval64. This should be true for
> > 64-bit architectures (expect for Alpha) and x32.
>
> I think you meant except.  But you are making some confusion here
> with both alpha and x32: both itimerval are use 64-bit time_t.
> The issue for alpha is that what is different is old osf syscalls
> uses 32-bit time_t and they are provided only as compat symbols.

I have fixed some mistakes here.

>
> >
> > Reviewed-by: Lukasz Majewski <lukma@denx.de>> ---
> >  bits/typesizes.h                                 | 6 ++++++
> >  sysdeps/unix/sysv/linux/alpha/bits/typesizes.h   | 3 +++
> >  sysdeps/unix/sysv/linux/generic/bits/typesizes.h | 6 ++++++
> >  sysdeps/unix/sysv/linux/s390/bits/typesizes.h    | 6 ++++++
> >  sysdeps/unix/sysv/linux/sparc/bits/typesizes.h   | 6 ++++++
> >  sysdeps/unix/sysv/linux/x86/bits/typesizes.h     | 3 +++
> >  6 files changed, 30 insertions(+)
> >
> > diff --git a/bits/typesizes.h b/bits/typesizes.h
> > index 599408973e..8f16903a21 100644
> > --- a/bits/typesizes.h
> > +++ b/bits/typesizes.h
> > @@ -76,10 +76,16 @@
> >
> >  /* And for fsblkcnt_t, fsblkcnt64_t, fsfilcnt_t and fsfilcnt64_t.  */
> >  # define __STATFS_MATCHES_STATFS64  1
> > +
> > +/* And for getitimer, setitimer and rusage  */
> > +# define __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64 1
> >  #else
> >  # define __RLIM_T_MATCHES_RLIM64_T   0
> >
> >  # define __STATFS_MATCHES_STATFS64  0
> > +
> > +/* And for getitimer, setitimer and rusage  */
> > +# define __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64 0
> >  #endif
> >
> >  /* Number of descriptors that can fit in an `fd_set'.  */
>
> Ok.
>
> > diff --git a/sysdeps/unix/sysv/linux/alpha/bits/typesizes.h b/sysdeps/unix/sysv/linux/alpha/bits/typesizes.h
> > index 28ee3e5920..e5d7774468 100644
> > --- a/sysdeps/unix/sysv/linux/alpha/bits/typesizes.h
> > +++ b/sysdeps/unix/sysv/linux/alpha/bits/typesizes.h
> > @@ -73,6 +73,9 @@
> >  /* Not for fsblkcnt_t, fsblkcnt64_t, fsfilcnt_t and fsfilcnt64_t.  */
> >  # define __STATFS_MATCHES_STATFS64  0
> >
> > +/* And for getitimer, setitimer and rusage  */
> > +#define __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64 0
> > +
> >  /* Number of descriptors that can fit in an `fd_set'.  */
> >  #define      __FD_SETSIZE            1024
> >
>
> I think this is wrong, alpha does have a itimerval with 64-bit
> time_t.

Ok, I have fixed this.

>
> > diff --git a/sysdeps/unix/sysv/linux/generic/bits/typesizes.h b/sysdeps/unix/sysv/linux/generic/bits/typesizes.h
> > index 7c963e523e..4fb246ac74 100644
> > --- a/sysdeps/unix/sysv/linux/generic/bits/typesizes.h
> > +++ b/sysdeps/unix/sysv/linux/generic/bits/typesizes.h
> > @@ -77,11 +77,17 @@
> >
> >  /* And for fsblkcnt_t, fsblkcnt64_t, fsfilcnt_t and fsfilcnt64_t.  */
> >  # define __STATFS_MATCHES_STATFS64  1
> > +
> > +/* And for getitimer, setitimer and rusage  */
> > +# define __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64 1
> >  #else
> >  # define __RLIM_T_MATCHES_RLIM64_T   0
> >
> >  # define __STATFS_MATCHES_STATFS64  0
> > +
> > +# define __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64 0
> >  #endif
> > +
> >  /* Number of descriptors that can fit in an `fd_set'.  */
> >  #define      __FD_SETSIZE            1024
> >
>
> Ok.
>
> > diff --git a/sysdeps/unix/sysv/linux/s390/bits/typesizes.h b/sysdeps/unix/sysv/linux/s390/bits/typesizes.h
> > index e775e460bb..2bc87c1079 100644
> > --- a/sysdeps/unix/sysv/linux/s390/bits/typesizes.h
> > +++ b/sysdeps/unix/sysv/linux/s390/bits/typesizes.h
> > @@ -82,10 +82,16 @@
> >
> >  /* And for fsblkcnt_t, fsblkcnt64_t, fsfilcnt_t and fsfilcnt64_t.  */
> >  # define __STATFS_MATCHES_STATFS64  1
> > +
> > +/* And for getitimer, setitimer and rusage  */
> > +# define __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64 1
> >  #else
> >  # define __RLIM_T_MATCHES_RLIM64_T   0
> >
> >  # define __STATFS_MATCHES_STATFS64  0
> > +
> > +/* And for getitimer, setitimer and rusage  */
> > +# define __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64 0
> >  #endif
> >
> >  /* Number of descriptors that can fit in an `fd_set'.  */
>
> Ok.
>
> > diff --git a/sysdeps/unix/sysv/linux/sparc/bits/typesizes.h b/sysdeps/unix/sysv/linux/sparc/bits/typesizes.h
> > index ac48c23e37..288a902b5f 100644
> > --- a/sysdeps/unix/sysv/linux/sparc/bits/typesizes.h
> > +++ b/sysdeps/unix/sysv/linux/sparc/bits/typesizes.h
> > @@ -76,10 +76,16 @@
> >
> >  /* And for fsblkcnt_t, fsblkcnt64_t, fsfilcnt_t and fsfilcnt64_t.  */
> >  # define __STATFS_MATCHES_STATFS64  1
> > +
> > +/* And for getitimer, setitimer and rusage  */
> > +# define __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64 1
> >  #else
> >  # define __RLIM_T_MATCHES_RLIM64_T   0
> >
> >  # define __STATFS_MATCHES_STATFS64  0
> > +
> > +/* And for getitimer, setitimer and rusage  */
> > +# define __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64 0
> >  #endif
> >
> >  /* Number of descriptors that can fit in an `fd_set'.  */
>
> Ok.
>
> > diff --git a/sysdeps/unix/sysv/linux/x86/bits/typesizes.h b/sysdeps/unix/sysv/linux/x86/bits/typesizes.h
> > index 87c50a4f32..f68dfecc90 100644
> > --- a/sysdeps/unix/sysv/linux/x86/bits/typesizes.h
> > +++ b/sysdeps/unix/sysv/linux/x86/bits/typesizes.h
> > @@ -94,6 +94,9 @@
> >  # define __STATFS_MATCHES_STATFS64  0
> >  #endif
> >
> > +/* And for getitimer, setitimer and rusage  */
> > +#define __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64 1
> > +
> >  /* Number of descriptors that can fit in an `fd_set'.  */
> >  #define __FD_SETSIZE         1024
> >
> >
>
> This is wrong for i686.

Fixed.

Alistair