cvs commit: src/lib/libc/gen lockf.c src/lib/libc/sys fcntl.2 src/sys/compat/freebsd32 syscalls.master src/sys/compat/linux linux_file.c src/sys/compat/svr4 svr4_fcntl.c src/sys/conf NOTES files options ...

Daniel Eischen deischen at
Mon Mar 9 20:37:29 PDT 2009

On Wed, 26 Mar 2008, Doug Rabson wrote:

> dfr         2008-03-26 15:23:13 UTC
>  FreeBSD src repository
>  Modified files:
>    lib/libc/sys fcntl.2
      [ ... ]
>    sys/sys              fcntl.h lockf.h
      [ ... ]
>  Log:
>  Add the new kernel-mode NFS Lock Manager. To use it instead of the
>  user-mode lock manager, build a kernel with the NFSLOCKD option and
>  add '-k' to 'rpc_lockd_flags' in rc.conf.

Sorry to notice this 1 year too late, but doesn't this
break ABI?  You have changed the size (increased) of
struct flock and haven't really provided a compat version
of fcntl() that will work with binaries built before
the change.

Is there any way that the new field can be accidentally
used by the kernel from a binary built against the older
struct flock?

Now that we have symbol versioning, the way this normally
should be handled is by adding a compat fcntl() for
FBSD_1.0 in libc, and placing the new fcntl() in FBSD_1.1.
And since libthr wraps fcntl() for cancellation points,
I believe it would also need the same compat functions.


More information about the cvs-src mailing list