1 files changed, 98 insertions, 0 deletions
diff --git a/resolv/res_libc.c b/resolv/res_libc.c
new file mode 100644
index 0000000000..14d565df0d
--- /dev/null
+++ b/resolv/res_libc.c
@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 1995-1999 by Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
+ * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+ * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+ * SOFTWARE.
+ */
+
+/* Define some functions that go int libc.so.  */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static const char rcsid[] = "$Id$";
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <arpa/nameser.h>
+
+#include <ctype.h>
+#include <netdb.h>
+#include <resolv.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#undef _res
+
+struct __res_state _res;
+
+/* This is the old res_init function.  It has been moved from
+   res_data.c to this file since res_init should go into libc.so but
+   the rest of res_data not.  */
+
+
+int
+res_init(void) {
+	extern int __res_vinit(res_state, int);
+
+	/*
+	 * These three fields used to be statically initialized.  This made
+	 * it hard to use this code in a shared library.  It is necessary,
+	 * now that we're doing dynamic initialization here, that we preserve
+	 * the old semantics: if an application modifies one of these three
+	 * fields of _res before res_init() is called, res_init() will not
+	 * alter them.  Of course, if an application is setting them to
+	 * _zero_ before calling res_init(), hoping to override what used
+	 * to be the static default, we can't detect it and unexpected results
+	 * will follow.  Zero for any of these fields would make no sense,
+	 * so one can safely assume that the applications were already getting
+	 * unexpected results.
+	 *
+	 * _res.options is tricky since some apps were known to diddle the bits
+	 * before res_init() was first called. We can't replicate that semantic
+	 * with dynamic initialization (they may have turned bits off that are
+	 * set in RES_DEFAULT).  Our solution is to declare such applications
+	 * "broken".  They could fool us by setting RES_INIT but none do (yet).
+	 */
+	if (!_res.retrans)
+		_res.retrans = RES_TIMEOUT;
+	if (!_res.retry)
+		_res.retry = 4;
+	if (!(_res.options & RES_INIT))
+		_res.options = RES_DEFAULT;
+
+	/*
+	 * This one used to initialize implicitly to zero, so unless the app
+	 * has set it to something in particular, we can randomize it now.
+	 */
+	if (!_res.id)
+		_res.id = res_randomid();
+
+	return (__res_vinit(&_res, 1));
+}
+
+/* We need a resolver context - in unthreaded apps, this weak function
+   provides it.  */
+
+struct __res_state *
+weak_const_function
+__res_state(void)
+{
+  return &_res;
+}