closes issue #10668; thanks to arkadia for his patch; had to leave out the bit about ending the previous cdr in the fork; it would destroy current implementations.

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@82444 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/cdr.c

@@ -311,6 +311,7 @@ int ast_cdr_setvar(struct ast_cdr *cdr, const char *name, const char *value, int
 	}
 
 	for (; cdr; cdr = recur ? cdr->next : NULL) {
+		if (!ast_test_flag(cdr, AST_CDR_FLAG_LOCKED)) {
 			headp = &cdr->varshead;
 			AST_LIST_TRAVERSE_SAFE_BEGIN(headp, newvariable, entries) {
 				if (!strcasecmp(ast_var_name(newvariable), name)) {
@@ -327,6 +328,7 @@ int ast_cdr_setvar(struct ast_cdr *cdr, const char *name, const char *value, int
 				AST_LIST_INSERT_HEAD(headp, newvariable, entries);
 			}
 		}
+	}
 
 	return 0;
 }
@@ -693,6 +695,7 @@ void ast_cdr_answer(struct ast_cdr *cdr)
 {
 
 	for (; cdr; cdr = cdr->next) {
+		if (!ast_test_flag(cdr, AST_CDR_FLAG_LOCKED)) {
 			check_post(cdr);
 			if (cdr->disposition < AST_CDR_ANSWERED)
 				cdr->disposition = AST_CDR_ANSWERED;
@@ -700,6 +703,7 @@ void ast_cdr_answer(struct ast_cdr *cdr)
 				cdr->answer = ast_tvnow();
 		}
 	}
+}
 
 void ast_cdr_busy(struct ast_cdr *cdr)
 {
@@ -842,6 +846,7 @@ int ast_cdr_init(struct ast_cdr *cdr, struct ast_channel *c)
 void ast_cdr_end(struct ast_cdr *cdr)
 {
 	for ( ; cdr ; cdr = cdr->next) {
+		if (!ast_test_flag(cdr, AST_CDR_FLAG_LOCKED)) {
 			check_post(cdr);
 			if (ast_tvzero(cdr->end))
 				cdr->end = ast_tvnow();
@@ -853,6 +858,7 @@ void ast_cdr_end(struct ast_cdr *cdr)
 			cdr->billsec = ast_tvzero(cdr->answer) ? 0 : cdr->end.tv_sec - cdr->answer.tv_sec;
 		}
 	}
+}
 
 char *ast_cdr_disp2str(int disposition)
 {