[Minios-devel] [UNIKRAFT PATCH 4/4] lib/posix-libdl: Add stubs

[Costin Lupu <costin.lupu@xxxxxxxxx>]

Unikraft does not support dynamic loading yet, all libraries are statically
linked. However, we simply provide stubs for those libraries that load dynamic
libraries explicitly. For debugging purposes, we choose to print the "loaded"
libraries names.

Signed-off-by: Andrei Gogonea <andrei.gogonea09@xxxxxxxxx>
Signed-off-by: Teodora Serbanescu <teo.serbanescu16@xxxxxxxxx>
Signed-off-by: Costin Lupu <costin.lupu@xxxxxxxxx>
---
 lib/posix-libdl/Makefile.uk   |  2 +
 lib/posix-libdl/exportsyms.uk |  7 +++-
 lib/posix-libdl/stubs.c       | 69 +++++++++++++++++++++++++++++++++++
 3 files changed, 77 insertions(+), 1 deletion(-)
 create mode 100644 lib/posix-libdl/stubs.c

diff --git a/lib/posix-libdl/Makefile.uk b/lib/posix-libdl/Makefile.uk
index 4e5109a5..27020fbd 100644
--- a/lib/posix-libdl/Makefile.uk
+++ b/lib/posix-libdl/Makefile.uk
@@ -2,3 +2,5 @@ $(eval $(call addlib_s,posix_libdl,$(CONFIG_POSIX_LIBDL)))
 
 CINCLUDES-$(CONFIG_POSIX_LIBDL)    += -I$(POSIX_LIBDL_BASE)/include
 CXXINCLUDES-$(CONFIG_POSIX_LIBDL)  += -I$(POSIX_LIBDL_BASE)/include
+
+POSIX_LIBDL_SRCS-y += $(POSIX_LIBDL_BASE)/stubs.c
diff --git a/lib/posix-libdl/exportsyms.uk b/lib/posix-libdl/exportsyms.uk
index 621e94f0..77c7a542 100644
--- a/lib/posix-libdl/exportsyms.uk
+++ b/lib/posix-libdl/exportsyms.uk
@@ -1 +1,6 @@
-none
+dlopen
+dlclose
+dlsym
+dlerror
+dladdr
+dlinfo
\ No newline at end of file
diff --git a/lib/posix-libdl/stubs.c b/lib/posix-libdl/stubs.c
new file mode 100644
index 00000000..dbfac7d1
--- /dev/null
+++ b/lib/posix-libdl/stubs.c
@@ -0,0 +1,69 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Authors: Andrei Gogonea <andrei.gogonea09@xxxxxxxxx>
+ *
+ * Copyright (c) 2019, University Politehnica of Bucharest. 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.
+ * 3. Neither the name of the copyright holder nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+
+#include <uk/essentials.h>
+#include <uk/print.h>
+#include <dlfcn.h>
+
+
+void *dlopen(const char *filename, int flags)
+{
+       uk_pr_debug("%s(%s, %d)\n", __func__, filename, flags);
+       return 0;
+}
+
+int dlclose(void *handle __unused)
+{
+       return 0;
+}
+
+void *dlsym(void *handle __unused, const char *symbol __unused)
+{
+       return 0;
+}
+
+char *dlerror(void)
+{
+       return 0;
+}
+
+int dladdr(const void *addr __unused, Dl_info *info __unused)
+{
+       return 0;
+}
+
+int dlinfo(void *handle __unused, int request __unused, void *info __unused)
+{
+       return 0;
+}
-- 
2.20.1


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