svn commit: r194040 - stable/7/lib/libc/gen

John Baldwin jhb at
Fri Jun 12 12:59:26 UTC 2009

On Friday 12 June 2009 6:13:08 am Dmitry Morozovsky wrote:
> On Thu, 11 Jun 2009, John Baldwin wrote:
> JB> Author: jhb
> JB> Date: Thu Jun 11 21:37:23 2009
> JB> New Revision: 194040
> JB> URL:
> JB> 
> JB> Log:
> JB>   If the running kernel has support for shm_open() and shm_unlink() as
> JB>   system calls (i.e. 8.0+), then invoke the system calls instead of using
> JB>   open/fcntl/unlink.  This is a direct commit instead of an MFC since libc
> JB>   in 8.0 always uses the system calls directly.
> So it could help running RELENG_7 jails under 8 host? 

In that case it probably doesn't matter either way.  The goal is that if you
have an 8.x binary and a 7.x binary that are both using shm_open() with a
path to open a SHM region for IPC, they will both access the same object.

If you have all 8.x binaries or all < 8.x binaries in the group that shares
access to a named SHM region then that case would work regardless.

John Baldwin

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