Align mach_msg_type_t and mach_msg_type_long_t with the same alignment as uintptr_t.

With this change, any 64 bit code using the IPC subsystem without relying on
MiG will work without any changes. We have a few examples of this inside gnumach but
also in the Hurd servers. For example, in hurd/console/display.c

  typedef struct
  {
    mach_msg_header_t Head;
    mach_msg_type_t ticknoType;
    natural_t tickno;
    mach_msg_type_t changeType;
    file_changed_type_t change;
    mach_msg_type_t startType;
    loff_t start;
    mach_msg_type_t endType;
    loff_t end;
  } Request;

This will now work correctly in 64 bits, without requiring any explicit padding.

As a follow up, we can simplify mach_msg_type_long_t so that we
only need an 8 byte structure where the second field will include the
number of elements for the long form. This is already included in
mach_msg_type_t as unused_msgtl_number.
Message-Id: <ZAbhOfOzsb8qPFs6@jupiter.tail36e24.ts.net>

0 files changed, 0 insertions, 0 deletions