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Re: [libvirt] [PATCH v2 3/5] Remove network constants out of internal.h



On Mon, Jul 10, 2017 at 16:07:08 +0100, Daniel Berrange wrote:
> On Mon, Jul 10, 2017 at 01:01:26PM +0200, Peter Krempa wrote:
> > On Wed, Jul 05, 2017 at 12:58:49 +0100, Daniel Berrange wrote:
> > > The HOST_NAME_MAX, INET_ADDRSTRLEN and VIR_LOOPBACK_IPV4_ADDR
> > > constants are only used by a handful of files, so are better
> > > kept in virsocketaddr.h
> > > 
> > > Signed-off-by: Daniel P. Berrange <berrange redhat com>
> > > ---
> > >  src/internal.h                         | 16 ----------------
> > >  src/libxl/libxl_conf.c                 |  1 +
> > >  src/nwfilter/nwfilter_dhcpsnoop.c      |  1 +
> > >  src/nwfilter/nwfilter_gentech_driver.c |  1 +
> > >  src/qemu/qemu_conf.c                   |  1 +
> > >  src/util/virsocketaddr.h               | 16 ++++++++++++++++
> > >  src/util/virutil.c                     |  1 +
> > >  src/vz/vz_sdk.c                        |  1 +
> > >  8 files changed, 22 insertions(+), 16 deletions(-)
> > > 
> > 
> > [...]
> > 
> > > diff --git a/src/util/virsocketaddr.h b/src/util/virsocketaddr.h
> > > index 43a3706..ae76166 100644
> > > --- a/src/util/virsocketaddr.h
> > > +++ b/src/util/virsocketaddr.h
> > > @@ -32,6 +32,22 @@
> > >  #  include <sys/un.h>
> > >  # endif
> > >  
> > > +/* On architectures which lack these limits, define them (ie. Cygwin).
> > > + * Note that the libvirt code should be robust enough to handle the
> > > + * case where actual value is longer than these limits (eg. by setting
> > > + * length correctly in second argument to gethostname and by always
> > > + * using strncpy instead of strcpy).
> > > + */
> > > +# ifndef HOST_NAME_MAX
> > > +#  define HOST_NAME_MAX 256
> > 
> > I'm not entirely convinced that this semantically belongs to
> > virsocketaddr.h
> > 
> > At least in the virlog.c usage case it is not used in any way in regards
> > to network communication.
> 
> The constant is used to define a hostname string buffer, which is then
> used with the gethostname() system call. That's network related IMHO.

I find it weird, that it gets defined in virsocketaddr.h, but the only
usage is in src/util/virutil.c thus it needs cross-inclusions which were
not in place prior to the move.

Should perhaps virGetHostnameImpl and friends be moved too in that case?

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