[Bug 273962] copy_file_range does not work on shared memory objects

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273962

--- Comment #13 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=84b4342c0d7ac8a3187309a978d41e6765154cc1

commit 84b4342c0d7ac8a3187309a978d41e6765154cc1
Author:     Rick Macklem <rmacklem@FreeBSD.org>
AuthorDate: 2023-12-29 22:59:00 +0000
Commit:     Rick Macklem <rmacklem@FreeBSD.org>
CommitDate: 2023-12-29 22:59:00 +0000

    copy_file_range.2: Clarify that only regular files work

    PR#273962 reported that copy_file_range(2) did not work
    on shared memory objects and returned EINVAL.
    Although the reporter felt this was incorrect, it is what
    the Linux copy_file_range(2) syscall does.

    Since there was no collective agreement that the FreeBSD
    semantics should be changed to no longer be Linux compatible,
    copy_file_range(2) still works on regular files only.

    This man page update clarifies that. If, someday, copy_file_range(2)
    is changed to support non-regular files, then the man page will
    need to be updated to reflect that.

    PR:     273962
    Reviewed by:    karels, pauamma_gundo.com (manpages)
    MFC after:      1 week
    Differential Revision:  https://reviews.freebsd.org/D43227

 lib/libc/sys/copy_file_range.2 | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

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