Hello Eric, On 2/6/23 19:45, Eric Blake wrote:
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
I gave it a try after a year since my last attempt. The open group website is one of the worst I've ever seen. I'm sorry, I can't get it to work. Could you please report a bug on my behalf?
I have an opengroup account, and supposedly am subscribed to the austin-group-l mailing list. But I'm not able to log it.
Thanks, Alex
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