Initial Contribution
diff --git a/libdl/Android.mk b/libdl/Android.mk
new file mode 100644
index 0000000..661aa18
--- /dev/null
+++ b/libdl/Android.mk
@@ -0,0 +1,50 @@
+LOCAL_PATH:= $(call my-dir)
+
+#
+# libdl
+#
+
+include $(CLEAR_VARS)
+
+# NOTE: --exclude-libs=libgcc.a makes sure that any symbols libdl.so pulls from
+# libgcc.a are made static to libdl.so. This in turn ensures that libraries that
+# a) pull symbols from libgcc.a and b) depend on libdl.so will not rely on libdl.so
+# to provide those symbols, but will instead pull them from libgcc.a. Specifically,
+# we use this property to make sure libc.so has its own copy of the code from
+# libgcc.a it uses.
+#
+# DO NOT REMOVE --exclude-libs!
+
+LOCAL_LDFLAGS := -Wl,--exclude-libs=libgcc.a
+LOCAL_SRC_FILES:= libdl.c
+
+LOCAL_MODULE:= libdl
+
+# NOTE: libdl needs __aeabi_unwind_cpp_pr0 from libgcc.a but libgcc.a needs a
+# few symbols from libc. Using --no-undefined here results in having to link
+# against libc creating a circular dependency which is removed and we end up
+# with missing symbols. Since this library is just a bunch of stubs, we set
+# LOCAL_ALLOW_UNDEFINED_SYMBOLS to remove --no-undefined from the linker flags.
+LOCAL_ALLOW_UNDEFINED_SYMBOLS := true
+LOCAL_SYSTEM_SHARED_LIBRARIES :=
+
+include $(BUILD_SHARED_LIBRARY)
+
+BUILD_DLTEST:=0
+ifeq ($(BUILD_DLTEST),1)
+
+#
+# dltest
+#
+
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES:= dltest.c
+
+LOCAL_MODULE:= dltest
+
+LOCAL_SHARED_LIBRARIES := libdl
+
+include $(BUILD_EXECUTABLE)
+
+endif
diff --git a/libdl/MODULE_LICENSE_BSD b/libdl/MODULE_LICENSE_BSD
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libdl/MODULE_LICENSE_BSD
diff --git a/libdl/NOTICE b/libdl/NOTICE
new file mode 100644
index 0000000..3831b34
--- /dev/null
+++ b/libdl/NOTICE
@@ -0,0 +1,26 @@
+Copyright (C) 2007 The Android Open Source Project
+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 project 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 PROJECT 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 PROJECT 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.
diff --git a/libdl/dltest.c b/libdl/dltest.c
new file mode 100755
index 0000000..e84d5a3
--- /dev/null
+++ b/libdl/dltest.c
@@ -0,0 +1,119 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <string.h>
+#include <dlfcn.h>
+
+extern char *optarg;
+extern int optind, opterr, optopt;
+
+static struct option long_options[] = {
+ {"library", required_argument, 0, 'l'},
+ {"symbol", required_argument, 0, 's'},
+ {"help", no_argument, 0, 'h'},
+ {0, 0, 0, 0},
+};
+
+/* This array must parallel long_options[] */
+static const char *descriptions[] = {
+ "specify a library path to look up symbol",
+ "specify symbol to look up",
+ "print this help screen",
+};
+
+void print_help(const char *name) {
+ fprintf(stdout,
+ "invokation:\n"
+ "\t%s [-l <libname>] -s <symbol name>\n"
+ "\t%s -h\n\n", name, name);
+ fprintf(stdout, "options:\n");
+ struct option *opt = long_options;
+ const char **desc = descriptions;
+ while (opt->name) {
+ fprintf(stdout, "\t-%c/--%s%s: %s\n",
+ opt->val,
+ opt->name,
+ (opt->has_arg ? " (argument)" : ""),
+ *desc);
+ opt++;
+ desc++;
+ }
+}
+
+int get_options(int argc, char **argv, char **lib, char **sym)
+{
+ int c;
+
+ *lib = 0;
+ *sym = 0;
+
+ while (1) {
+ /* getopt_long stores the option index here. */
+ int option_index = 0;
+
+ c = getopt_long (argc, argv,
+ "l:s:h",
+ long_options,
+ &option_index);
+ /* Detect the end of the options. */
+ if (c == -1) break;
+
+ switch (c) {
+ case 'l':
+ *lib = strdup(optarg);
+ break;
+ case 's':
+ *sym = strdup(optarg);
+ break;
+ case 'h': print_help(argv[0]); exit(EXIT_FAILURE); break;
+ case '?':
+ /* getopt_long already printed an error message. */
+ break;
+ default:
+ fprintf(stderr, "Unknown option");
+ exit(EXIT_FAILURE);
+ }
+ }
+
+ return optind;
+}
+
+int main(int argc, char **argv)
+{
+ char *libname, *symname, *prog = *argv;
+
+ get_options(argc, argv, &libname, &symname);
+
+ if (symname == NULL) {
+ fprintf(stderr, "You must specify a symbol!\n");
+ print_help(prog);
+ exit(EXIT_FAILURE);
+ }
+
+ {
+ const char *dlerr;
+ void *handle, *symbol;
+
+ printf("opening library [%s]\n", libname);
+ dlerr = dlerror();
+ handle = libname ? dlopen(libname, RTLD_NOW) : RTLD_DEFAULT;
+ dlerr = dlerror();
+ if (dlerr != NULL) fprintf(stderr, "dlopen() error: %s\n", dlerr);
+
+ printf("opening symbol [%s]\n", symname);
+ symbol = dlsym(handle, symname);
+ dlerr = dlerror();
+ if (dlerr != NULL) fprintf(stderr, "dlsym() error: %s\n", dlerr);
+
+ printf("closing library [%s]\n", libname);
+ dlclose(handle);
+ dlerr = dlerror();
+ if (dlerr != NULL) fprintf(stderr, "dlclose() error: %s\n", dlerr);
+ else printf("successfully opened symbol\n");
+ }
+
+ if (libname != NULL) free(libname);
+ if (symname != NULL) free(symname);
+ return 0;
+}
diff --git a/libdl/libdl.c b/libdl/libdl.c
new file mode 100644
index 0000000..0411623
--- /dev/null
+++ b/libdl/libdl.c
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* These are stubs for functions that are actually defined
+ * in the dynamic linker (dlfcn.c), and hijacked at runtime.
+ */
+void *dlopen(const char *filename, int flag) { return 0; }
+char *dlerror(void) { return 0; }
+void *dlsym(void *handle, const char *symbol) { return 0; }
+int dlclose(void *handle) { return 0; }
+void *dl_unwind_find_exidx(void *pc, int *pcount) { return 0; }