Y2038: add struct __timespec64

This type is a glibc-internal type similar to struct timespec
but whose tv_sec field is a _time64_t rather than a time_t,
which makes it Y2038-proof and useable to pass between user
code and Y2038-proof kernel syscalls.

On 64-bit architectures, and on X32, struct __timespec64 is
just an alias of struct timespec, which is already 64-bit.
On other architectures, it must be explicitly defined.

In order to match the Linux kernel struct, the tv_nsec field
of struct __timespec64 is also a signed 64-bit integer. The
kernel ensures that the higher half of tv_nsec is always 0,
which means glibc does not need to do it.

Note: the corresponding glibc public* type will differ from
this private type, as the user source code might depend on the
tv_nsec field being a 32-bit long, not a 64-bit int. To meet
this expectation, the public type will have a 32-bit tv_nsec
field plus 32-bit anonymous padding, ordered according to the
endianness of the architecture.

Tested with make xtests on x86_64 and ARM.

* include/bits/types/struct_timespec64.h:
  Include time/bits/types/struct_timespec64.h
* include/time.h (valid_timeval_to_timespec64): Add.
* include/time.h (valid_timespec_to_timespec64): Likewise.
* include/time.h (valid_timespec64_to_timespec): Likewise.
* include/time.h (valid_timespec64_to_timeval): Likewise.
* include/time.h (IS_VALID_NANOSECONDS): Likewise.
* include/time.h (timespec_to_timespec64): Likewise.
* include/time.h (timespec64_to_timespec): Likewise.
* include/time.h (timespec64_to_timeval): Likewise.
* io/fcntl.h: Include bits/types/struct_timespec64.h.
* io/sys/poll.h: Likewise.
* io/sys/stat.h: Likewise.
* misc/sys/select.h: Likewise.
* posix/sched.h: Likewise.
* posix/netdb.h: Likewise.
* rt/aio.h: Likewise.
* rt/mqueue.h: Likewise.
* signal/signal.h: Likewise.
* sysdeps/nptl/pthread.h: Likewise.
* sysdeps/pthread/semaphore.h: Likewise.
* sysdeps/unix/sysv/linux/hppa/pthread.h: Likewise.
* sysvipc/sys/sem.h: Likewise.
* time/Makefile: Add bits/types/struct_timespec64.h
* time/bits/types/struct_itimerspec.h:
  Include bits/types/struct_timespec64.h
* time/bits/types/struct_itimerspec64.h: Add.
* time/time.h: Include bits/types/struct_timespec64.h

0 files changed, 0 insertions, 0 deletions