On Wed, Nov 30, 2022 at 08:54:03AM -0600, Eric Blake via austin-group-l at The Open Group wrote: > > ... > > |https://austingroupbugs.net/view.php?id=561
> > First, I chose that wording because 'sizeof(struct > sockaddr_un.sun_path)' doesn't compile. You are right that 'sizeof > NAME.sun_path' does compile, if NAME is an expression of type struct > sockaddr_un, but the sentence becomes longer to introduce some object > named NAME of the correct type just to get to the shorter sizeof > expression. However, we can make that edit if it makes sense. Having written that, I did test that 'sizeof(((struct sockaddr_un*)0)->sun_path)' compiles with gcc, although I'm less certain of whether the C standard permits that (or even if that permission has changed over time) - the expression argument to sizeof is unevaluated, which counters the argument that you can't normally evaluate a dereference of a NULL pointer. -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3266 Virtualization: qemu.org | libvirt.org
