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Date: Sat, 23 Nov 2019 17:05:17 +0100
From: Florian Weimer <>
Subject: Re: freeaddrinfo() comments and questions

* gilles:

> In these other implementations, it is possible to write a custom
> struct addrinfo allocator and use freeaddrinfo() on it, just like it
> is possible to use getaddrinfo() and use a custom release function on
> it. This is not a very common use-case, granted, but it is one
> nonetheless, and one that works and has worked in a portable way for a
> long time across a wide variety of systems.

I think this is clearly undefined.  There is no way to know how
storage for ai_addr and ai_canonname is managed.  These pointers could
point to separate allocations, made with malloc.  They could be
interior pointers to the same top-level allocation at which start the
struct addrinfo object is allocated.  Nothing even needs to use
malloc, including the outer struct addrinfo object.

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