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, 9 insertions, 4 deletions

diff --git a/src/lib/libc/net/sethostent.c b/src/lib/libc/net/sethostent.c
index 5392a2f11b..40a5a80962 100644
--- a/src/lib/libc/net/sethostent.c
+++ b/src/lib/libc/net/sethostent.c
@@ -32,7 +32,7 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char rcsid[] = "$OpenBSD: sethostent.c,v 1.4 1997/03/15 21:53:50 pefo Exp $";
+static char rcsid[] = "$OpenBSD: sethostent.c,v 1.5 2003/01/28 04:58:00 marc Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <sys/param.h>
@@ -41,20 +41,25 @@ static char rcsid[] = "$OpenBSD: sethostent.c,v 1.4 1997/03/15 21:53:50 pefo Exp
 #include <netdb.h>
 #include <resolv.h>
 
+#include "thread_private.h"
+
 void
 sethostent(stayopen)
         int stayopen;
 {
+        struct __res_state *_resp = _THREAD_PRIVATE(_res, _res, &_res);
 
-        if ((_res.options & RES_INIT) == 0 && res_init() == -1)
+        if ((_resp->options & RES_INIT) == 0 && res_init() == -1)
                 return;
         if (stayopen)
-                _res.options |= RES_STAYOPEN | RES_USEVC;
+                _resp->options |= RES_STAYOPEN | RES_USEVC;
 }
 
 void
 endhostent()
 {
-        _res.options &= ~(RES_STAYOPEN | RES_USEVC);
+        struct __res_state *_resp = _THREAD_PRIVATE(_res, _res, &_res);
+
+        _resp->options &= ~(RES_STAYOPEN | RES_USEVC);
         res_close();
 }