thread safer libc (note: safer, not safe)

Access to the global _res structure replaced by pointers to a
per thread instance.  If unthreaded the pointer is to the
global structure.

Also replaced a 64k stack array with malloc-ed memory so
threaded aps (with a default 64k stack) have a chance at working.
ok deraadt@

1 files changed, 10 insertions, 1 deletions

diff --git a/src/lib/libc/include/thread_private.h b/src/lib/libc/include/thread_private.h
index 0b0be6cb38..4212e7dcb2 100644
--- a/src/lib/libc/include/thread_private.h
+++ b/src/lib/libc/include/thread_private.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: thread_private.h,v 1.14 2002/11/05 22:19:55 marc Exp $ */
+/* $OpenBSD: thread_private.h,v 1.15 2003/01/28 04:58:00 marc Exp $ */
 
 #ifndef _THREAD_PRIVATE_H_
 #define _THREAD_PRIVATE_H_
@@ -87,6 +87,15 @@ void *	_libc_private_storage(volatile struct _thread_private_key_struct *,
                               &(storage), sizeof (storage), error)
 
 /*
+ * Keys used to access the per thread instances of resolver global data.
+ * These are not static as they are referenced in several places.
+ */
+extern volatile struct _thread_private_key_struct __THREAD_KEY_NAME(_res);
+#ifdef INET6
+extern volatile struct _thread_private_key_struct __THREAD_KEY_NAME(_res_ext);
+#endif
+
+/*
  * File descriptor locking definitions.
  */
 #define FD_READ             0x1