1 files changed, 96 insertions, 0 deletions
diff --git a/lib/libc/gen/dlfcn.c b/lib/libc/gen/dlfcn.c
new file mode 100644
index 0000000..3f00346
--- /dev/null
+++ b/lib/libc/gen/dlfcn.c
@@ -0,0 +1,96 @@
+/*-
+ * Copyright (c) 1998 John D. Polstra
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	$Id$
+ */
+
+/*
+ * Trampolines to services provided by the dynamic linker.
+ */
+
+#include <sys/types.h>
+#include <nlist.h>		/* XXX - Required by link.h */
+#include <dlfcn.h>
+#include <link.h>
+#include <stddef.h>
+
+/*
+ * These variables are set by code in crt0.o.  For compatibility with
+ * old executables, they must be common, not extern.
+ */
+struct ld_entry	*__ldso_entry;		/* Entry points to dynamic linker */
+int		 __ldso_version;	/* Dynamic linker version number */
+
+void *
+dlopen(name, mode)
+	const char	*name;
+	int		 mode;
+{
+	if (__ldso_entry == NULL)
+		return NULL;
+	return (__ldso_entry->dlopen)(name, mode);
+}
+
+int
+dlclose(fd)
+	void		*fd;
+{
+	if (__ldso_entry == NULL)
+		return -1;
+	return (__ldso_entry->dlclose)(fd);
+}
+
+void *
+dlsym(fd, name)
+	void		*fd;
+	const char	*name;
+{
+	if (__ldso_entry == NULL)
+		return NULL;
+	if (__ldso_version >= LDSO_VERSION_HAS_DLSYM3) {
+		void *retaddr = *(&fd - 1);  /* XXX - ABI/machine dependent */
+		return (__ldso_entry->dlsym3)(fd, name, retaddr);
+	} else
+		return (__ldso_entry->dlsym)(fd, name);
+}
+
+
+const char *
+dlerror()
+{
+	if (__ldso_entry == NULL)
+		return "Service unavailable";
+	return (__ldso_entry->dlerror)();
+}
+
+int
+dladdr(addr, dlip)
+	const void	*addr;
+	Dl_info		*dlip;
+{
+	if (__ldso_entry == NULL || __ldso_version < LDSO_VERSION_HAS_DLADDR)
+		return 0;
+	return (__ldso_entry->dladdr)(addr, dlip);
+}