Hi, I have opened a defect at austin group https://www.austingroupbugs.net/view.php?id=1641 Bastien Le lun. 6 févr. 2023 à 18:45, Eric Blake <eblake@xxxxxxxxxx> a écrit : > > On Sun, Feb 05, 2023 at 04:28:36PM +0100, Alejandro Colomar wrote: > > Regardless of the merits of the patch, let's not introduce typos: > > > +++ b/man3type/sockaddr.3type > > @@ -120,6 +120,26 @@ .SH NOTES > > .I <netinet/in.h> > > and > > .IR <sys/un.h> . > > +.SH BUGS > > +.I sockaddr_storage > > +was designed back when strict aliasing wasn't a problem. > > +Back then, > > +one would define a variable of that type, > > +and then access it as any of the other > > +.IR sockaddr_ * > > +types, > > +depending on the value of the first member. > > +This is Undefined Behavior. > > +However, there is no way to use these APIs without invoking Unedfined Behavior, > > Undefined > > > +either in the user program or in libc, > > +so it is still recommended to use this method. > > +The only correct way to use different types in an API is through a union. > > +However, > > +that union must be implemented in the library, > > +since the type must be shared between the library and user code, > > +so libc should be fixed by implementing > > +.I sockaddr_storage > > +as a union. > > .SH SEE ALSO > > .BR accept (2), > > .BR bind (2), > > Also, while I could raise the issue with the Austin Group on your > behalf to get the POSIX wording improved, I think it would work better > if you initiate a bug report rather than having me do it: > > https://www.austingroupbugs.net/main_page.php > > -- > Eric Blake, Principal Software Engineer > Red Hat, Inc. +1-919-301-3266 > Virtualization: qemu.org | libvirt.org >
