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Subject: Re: Calling getaddrinfo(3) in 32-bit binary on 64-bit host
To: Konstantin Belousov <kostikbel@gmail.com>, Li-Wen Hsu <lwhsu@freebsd.org>
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Cc: Yuri Pankov <yuripv@icloud.com>, freebsd-hackers@freebsd.org
From: Eugene Grosbein <eugen@grosbein.net>
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23.01.2018 2:29, Konstantin Belousov пишет:
> On Tue, Jan 23, 2018 at 02:55:24AM +0800, Li-Wen Hsu wrote:
>> I'll try to find other uses of SA_SIZE() and see if they would be run in
>> compat32 mode and works or not.
> There are enough uses of SA_SIZE() by functions which are perhaps called
> both from a sysctl handler and for queuing the routing messages into routing
> socket queue.  In the later case, we cannot know ABI of the reader.  This
> is what I referenced when I noted that routing socket's ABI compat is
> impossible to implement correctly.

Can't we supply sysctl handler with some kind of back reference to original
userland caller of the syscall to find its ABI?