[PATCH v3 0/8] Always use 32-bit time_t for certain syscalls

[Alistair Francis <alistair dot francis at wdc dot com>]

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.

This series converts getitimer, setitimer, getrusage and wait4 to be
both y2038 safe and pass a 32-bit time_t based on the
__KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64 macro. On 32-bit systems
we will pass a 32-bit time to the kernel (no matter the time_t size). This is
no change for most 64-bit architectures or 32-bit architectures with a 32-bit time_t.

We can also remove the old Alpha functions as this is now handled genericly.

I don't have a way to test this on Alpha, would someone mind testing it for me?

This follows the standard y2038 conversion so that we don't break
backwards compatibility but we expose a 64-bit version for y2038 safe
architectrures (like RV32).

This series was tested by running:
  ./scripts/build-many-glibcs.py ... compilers
  ./scripts/build-many-glibcs.py ... glibcs
on my x86_64 machine.

I also ran make check on RV32 and I only see a total of 10 test failures.

Alistair Francis (8):
  sysv/linux: Rename alpha functions to be alpha specific
  time: Add a timeval with a 32-bit tv_sec and tv_usec
  time: Add a __itimerval64 struct
  sysv: Define __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64
  linux: Use long time_t __getitimer/__setitimer
  resource: Add a __rusage64 struct
  linux: Use long time_t for wait4/getrusage
  sysv/alpha: Use generic __timeval32 and helpers

 bits/typesizes.h                              |   6 +
 include/sys/resource.h                        | 120 ++++++++++++++++++
 include/time.h                                |  71 +++++++++++
 .../unix/sysv/linux/alpha/bits/typesizes.h    |   3 +
 sysdeps/unix/sysv/linux/alpha/osf_adjtime.c   |   7 +-
 sysdeps/unix/sysv/linux/alpha/osf_getitimer.c |   3 +-
 sysdeps/unix/sysv/linux/alpha/osf_getrusage.c |   8 +-
 .../unix/sysv/linux/alpha/osf_gettimeofday.c  |   4 +-
 sysdeps/unix/sysv/linux/alpha/osf_setitimer.c |   5 +-
 .../unix/sysv/linux/alpha/osf_settimeofday.c  |   4 +-
 sysdeps/unix/sysv/linux/alpha/osf_utimes.c    |   4 +-
 sysdeps/unix/sysv/linux/alpha/osf_wait4.c     |   8 +-
 .../unix/sysv/linux/generic/bits/typesizes.h  |   7 +
 sysdeps/unix/sysv/linux/getitimer.c           |  61 +++++++++
 sysdeps/unix/sysv/linux/getrusage.c           |  58 +++++++++
 sysdeps/unix/sysv/linux/s390/bits/typesizes.h |   6 +
 sysdeps/unix/sysv/linux/setitimer.c           |  95 ++++++++++++++
 .../unix/sysv/linux/sparc/bits/typesizes.h    |   6 +
 .../unix/sysv/linux/{alpha => }/tv32-compat.h |  86 +++++--------
 sysdeps/unix/sysv/linux/wait4.c               |  49 ++++++-
 sysdeps/unix/sysv/linux/x86/bits/typesizes.h  |   3 +
 21 files changed, 541 insertions(+), 73 deletions(-)
 create mode 100644 sysdeps/unix/sysv/linux/getitimer.c
 create mode 100644 sysdeps/unix/sysv/linux/getrusage.c
 create mode 100644 sysdeps/unix/sysv/linux/setitimer.c
 rename sysdeps/unix/sysv/linux/{alpha => }/tv32-compat.h (59%)

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2.25.0