From 79afa3a523e92a1d552d46729b1e1d04db97f72c Mon Sep 17 00:00:00 2001
From: ian <ian>
Date: Mon, 27 Dec 2004 16:26:16 +0000
Subject: [PATCH] get resolver destruction right

---
 adns/adns.c | 64 +++++++++++++++++++++++++++++++----------------------
 1 file changed, 37 insertions(+), 27 deletions(-)

diff --git a/adns/adns.c b/adns/adns.c
index 78b6d79..d57c49b 100644
--- a/adns/adns.c
+++ b/adns/adns.c
@@ -287,10 +287,11 @@ static void destroy_resolver(Tcl_Interp *ip, Resolver *res) {
       asynch_query_dispose(ip, query_v);
     }
     adns_finish(res->ads);
+    res->ads= 0;
   }
   asynch_cancelhandlers(res);
   scriptinv_cancel(&res->errcallback);
-  TFREE(res);
+  Tcl_EventuallyFree(res, Tcl_Free);
 }
 
 static void destroy_resolver_idtabcb(Tcl_Interp *ip, void *resolver_v) {
@@ -430,33 +431,36 @@ static const OptionInfo query_optioninfos[]= {
 static int query_submit(Tcl_Interp *ip,
 			const AdnsTclRRTypeInfo *type, const char *domain,
 			int queryopts_objc, Tcl_Obj *const *queryopts_objv,
-			adns_query *aqu_r, void *context, OptionParse *op) {
+			adns_query *aqu_r, void *context, Resolver **res_r) {
   struct sockaddr sa;
   static const int aftry[]= { AF_INET, AF_INET6 };
+  OptionParse op;
   OptionParse res_op;
   int rc, r, ec;
   adns_state ads;
   
-  op->aflags= adns_qf_owner;
-  op->sflags= 0;
-  op->resolver= 0;
-  op->reverseany= 0;
-  rc= parse_options(ip, queryopts_objc,queryopts_objv, query_optioninfos,op);
+  op.aflags= adns_qf_owner;
+  op.sflags= 0;
+  op.resolver= 0;
+  op.reverseany= 0;
+  rc= parse_options(ip, queryopts_objc,queryopts_objv, query_optioninfos,&op);
   if (rc) return rc;
 
-  if (!op->resolver) {
-    op->resolver= default_resolver(ip);
-    if (!op->resolver) {
+  if (!op.resolver) {
+    op.resolver= default_resolver(ip);
+    if (!op.resolver) {
       optparse_blank(&res_op);
-      rc= create_resolver(ip, &res_op, &op->resolver);
+      rc= create_resolver(ip, &res_op, &op.resolver);
       if (rc) return rc;
 
       Tcl_SetAssocData(ip, ASSOC_DEFAULTRES,
-		       destroy_resolver_defcb, op->resolver);
+		       destroy_resolver_defcb, op.resolver);
     }
   }
+
+  *res_r= op.resolver;
   
-  if (op->reverseany || (op->sflags & oisf_reverse)) {
+  if (op.reverseany || (op.sflags & oisf_reverse)) {
     const int *af;
     for (af=aftry; af < af + sizeof(af)/sizeof(*af); af++) {
       memset(&sa,0,sizeof(sa));
@@ -468,17 +472,17 @@ static int query_submit(Tcl_Interp *ip,
   af_found:;
   }
 
-  ads= op->resolver->ads;
+  ads= op.resolver->ads;
 
-  if (op->reverseany) {
-    ec= adns_submit_reverse_any(ads, &sa, op->reverseany,
-				type->number, op->aflags, context, aqu_r);
-  } else if (op->sflags & oisf_reverse) {
+  if (op.reverseany) {
+    ec= adns_submit_reverse_any(ads, &sa, op.reverseany,
+				type->number, op.aflags, context, aqu_r);
+  } else if (op.sflags & oisf_reverse) {
     ec= adns_submit_reverse(ads, &sa,
-			    type->number, op->aflags, context, aqu_r);
+			    type->number, op.aflags, context, aqu_r);
   } else {
     ec= adns_submit(ads, domain,
-		    type->number, op->aflags, context, aqu_r);
+		    type->number, op.aflags, context, aqu_r);
   }
   if (ec)
     return posixerr(ip,ec,"submit adns query");
@@ -533,14 +537,12 @@ static int synch(Tcl_Interp *ip, const AdnsTclRRTypeInfo *rrtype,
 		 const char *domain,
 		 int objc, Tcl_Obj *const *objv, adns_answer **answer_r) {
   adns_query aqu;
-  OptionParse op;
   Resolver *res;
   int rc, ec;
   
-  rc= query_submit(ip,rrtype,domain,objc,objv,&aqu,0,&op);
+  rc= query_submit(ip,rrtype,domain,objc,objv,&aqu,0,&res);
   if (rc) return rc;
 
-  res= op.resolver;
   ec= adns_wait(res->ads,&aqu,answer_r,0);
   assert(!ec);
 
@@ -685,7 +687,14 @@ static void asynch_check_now(Resolver *res) {
   int ec;
   Tcl_Obj *results[RESULTLIST_LLEN];
 
+  Tcl_Preserve(res);
+  
   for (;;) {
+    if (!res->ads) { /* oh, it has been destroyed! */
+      Tcl_Release(res);
+      return;
+    }
+
     aqu= 0;
     ec= adns_check(res->ads, &aqu, &answer, &query_v);
     if (ec==ESRCH || ec==EAGAIN) break;
@@ -706,6 +715,8 @@ static void asynch_check_now(Resolver *res) {
   }
 
   asynch_sethandlers(res);
+
+  Tcl_Release(res);
 }
     
 int do_adns_asynch(ClientData cd, Tcl_Interp *ip,
@@ -715,8 +726,7 @@ int do_adns_asynch(ClientData cd, Tcl_Interp *ip,
 		   int objc, Tcl_Obj *const *objv, void **result) {
   Query *query;
   int rc;
-  Resolver *res=0;
-  OptionParse op;
+  Resolver *res= 0;
   
   query= TALLOC(sizeof(*query));
   query->ix= -1;
@@ -726,10 +736,10 @@ int do_adns_asynch(ClientData cd, Tcl_Interp *ip,
   scriptinv_init(&query->on_fail);
   query->xargs= 0;
 
-  rc= query_submit(ip,rrtype,domain,objc,objv,&query->aqu,query,&op);
+  rc= query_submit(ip,rrtype,domain,objc,objv,&query->aqu,query,&query->res);
   if (rc) goto x_rc;
 
-  res= op.resolver;
+  res= query->res;
 
   rc= scriptinv_set(&query->on_yes, ip,on_yes, xargs);  if (rc) goto x_rc;
   rc= scriptinv_set(&query->on_no,  ip,on_no,  xargs);  if (rc) goto x_rc;
-- 
2.30.2