Date: Fri, 12 Jun 2009 14:44:24 -0400 From: John Baldwin <jhb@freebsd.org> To: Jilles Tjoelker <jilles@stack.nl> Cc: svn-src-stable@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org, svn-src-stable-7@freebsd.org, Dmitry Morozovsky <marck@rinet.ru> Subject: Re: svn commit: r194040 - stable/7/lib/libc/gen Message-ID: <200906121444.25292.jhb@freebsd.org> In-Reply-To: <20090612133418.GA8206@stack.nl> References: <200906112137.n5BLbO2S060767@svn.freebsd.org> <200906120851.32846.jhb@freebsd.org> <20090612133418.GA8206@stack.nl>
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On Friday 12 June 2009 9:34:18 am Jilles Tjoelker wrote: > On Fri, Jun 12, 2009 at 08:51:32AM -0400, John Baldwin wrote: > > 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: http://svn.freebsd.org/changeset/base/194040 > > > 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. > > where "< 8.x binaries" refers to those using 7.x's libc.so.7. > Normally, a 7.x binary running on 8.x will link to 8.x's libc.so.7 and > therefore use the new SHM objects even without this change. True. It is more relevant to libc.so.[46] which I plan to update next week when the MFC after timer expires, and that is the true target audience I have in mind (many people still use 4.x and 6.x binaries on newer kernels). -- John Baldwin
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