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resolv: Introduce struct resolv_context [BZ #21668]

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struct resolv_context objects provide a temporary resolver context
which does not change during a name lookup operation.  Only when the
outmost context is created, the stub resolver configuration is
verified to be current (at present, only against previous res_init
calls).  Subsequent attempts to obtain the context will reuse the
result of the initial verification operation.

struct resolv_context can also be extended in the future to store
data which needs to be deallocated during thread cancellation.
This commit is contained in:
Florian Weimer
2017-06-30 21:10:23 +02:00
parent 4e45d83c92
commit 352f4ff9a2
24 changed files with 1032 additions and 370 deletions
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31
resolv/res_libc.c
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@ -98,37 +98,6 @@ res_init (void)
return __res_vinit (&_res, 1);
}
/* Initialize *RESP if RES_INIT is not yet set in RESP->options, or if
res_init in some other thread requested re-initializing. */
int
__res_maybe_init (res_state resp, int preinit)
{
if (resp->options & RES_INIT)
{
if (__res_initstamp != resp->_u._ext.initstamp)
{
if (resp->nscount > 0)
__res_iclose (resp, true);
return __res_vinit (resp, 1);
}
return 0;
}
else if (preinit)
{
if (!resp->retrans)
resp->retrans = RES_TIMEOUT;
if (!resp->retry)
resp->retry = RES_DFLRETRY;
resp->options = RES_DEFAULT;
if (!resp->id)
resp->id = res_randomid ();
return __res_vinit (resp, 1);
}
else
return __res_ninit (resp);
}
libc_hidden_def (__res_maybe_init)
/* This needs to be after the use of _res in res_init, above. */
#undef _res