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[SCM] GNU Mach branch, master, updated. v1.8-601-g8e5e86fc

From: Samuel Thibault
Subject: [SCM] GNU Mach branch, master, updated. v1.8-601-g8e5e86fc
Date: Tue, 7 Mar 2023 18:44:14 -0500 (EST)

This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU Mach".

The branch, master has been updated
       via  8e5e86fc13732b60d2e4d14152d92db1f1ae73f9 (commit)
      from  e52779eb879ea8a14bb293e97c989f52eb439cbb (commit)

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- Log -----------------------------------------------------------------
commit 8e5e86fc13732b60d2e4d14152d92db1f1ae73f9
Author: Flavio Cruz <>
Date:   Tue Mar 7 02:01:13 2023 -0500

    Align mach_msg_type_t and mach_msg_type_long_t with the same alignment as 
    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 
    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: <>


Summary of changes:
 i386/i386/copy_user.h  |   4 +-
 include/mach/message.h |  14 ++--
 x86_64/copy_user.c     | 186 ++++++++++++++++++++++++++++++++++++++-----------
 3 files changed, 156 insertions(+), 48 deletions(-)

GNU Mach

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