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resolv: Remove support for RES_USE_INET6 and the inet6 option

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This functionality was deprecated in glibc 2.25.

This commit only includes the core changes to remove the
functionality.  It does not remove the RES_USE_INET6 handling in the
individual NSS service modules and the res_use_inet6 function.
These changes will happen in future commits.
This commit is contained in:
Florian Weimer
2019-04-08 10:40:31 +02:00
parent 94e358f6d4
commit 3f8b44be0a
15 changed files with 61 additions and 680 deletions
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11
resolv/resolv_context.h
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@@ -26,9 +26,7 @@
allocating a new context. This prevents unexpected reloading of
the resolver configuration. Care is taken to keep the context in
sync with the thread-local _res object. (This does not happen with
__resolv_context_get_override, and __resolv_context_get_no_inet6 may
also interpose another context object if RES_USE_INET6 needs to be
disabled.)
__resolv_context_get_override.)
In contrast to struct __res_state, struct resolv_context is not
affected by ABI compatibility concerns.
@@ -62,8 +60,8 @@ struct resolv_context
size_t __refcount; /* Count of reusages by the get functions. */
bool __from_res; /* True if created from _res. */
/* If RES_USE_INET6 was disabled at this level, this field points to
the previous context. */
/* Single-linked list of resolver contexts. Used for memory
deallocation on thread cancellation. */
struct resolv_context *__next;
};
@@ -75,8 +73,7 @@ struct resolv_context *__resolv_context_get (void)
libc_hidden_proto (__resolv_context_get)
/* Deallocate the temporary resolver context. Converse of
__resolv_context_get. Restore the RES_USE_INET6 flag if necessary.
Do nothing if CTX is NULL. */
__resolv_context_get. Do nothing if CTX is NULL. */
void __resolv_context_put (struct resolv_context *ctx);
libc_hidden_proto (__resolv_context_put)