Move dlext_namespaces.h to the platform Prebuilt ART doesn't provide the header anymore. So, this needs to be provided by the platform now. The contents of the header come from the now-deleted ART header, as the platform was using that only until now: art/libnativeloader/include/nativeloader/dlext_namespaces.h Bug: 447170362 Test: build Change-Id: I98370724829b4d2c019c135c0049655701e1ebf7
diff --git a/libc/platform/nativeloader/dlext_namespaces.h b/libc/platform/nativeloader/dlext_namespaces.h new file mode 100644 index 0000000..b16a645 --- /dev/null +++ b/libc/platform/nativeloader/dlext_namespaces.h
@@ -0,0 +1,101 @@ + +/* + * Copyright (C) 2016 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. + */ +#ifndef ART_LIBNATIVELOADER_INCLUDE_NATIVELOADER_DLEXT_NAMESPACES_H_ +#define ART_LIBNATIVELOADER_INCLUDE_NATIVELOADER_DLEXT_NAMESPACES_H_ +#include <android/dlext.h> +#include <stdbool.h> +__BEGIN_DECLS +enum { + /* A regular namespace is the namespace with a custom search path that does + * not impose any restrictions on the location of native libraries. + */ + ANDROID_NAMESPACE_TYPE_REGULAR = 0, + /* An isolated namespace requires all the libraries to be on the search path + * or under permitted_when_isolated_path. The search path is the union of + * ld_library_path and default_library_path. + */ + ANDROID_NAMESPACE_TYPE_ISOLATED = 1, + /* The shared namespace clones the list of libraries of the caller namespace upon creation + * which means that they are shared between namespaces - the caller namespace and the new one + * will use the same copy of a library if it was loaded prior to android_create_namespace call. + * + * Note that libraries loaded after the namespace is created will not be shared. + * + * Shared namespaces can be isolated or regular. Note that they do not inherit the search path nor + * permitted_path from the caller's namespace. + */ + ANDROID_NAMESPACE_TYPE_SHARED = 2, + /* This flag instructs linker to enable exempt-list workaround for the namespace. + * See http://b/26394120 for details. + */ + ANDROID_NAMESPACE_TYPE_EXEMPT_LIST_ENABLED = 0x08000000, + /* This flag instructs linker to use this namespace as the anonymous + * namespace. The anonymous namespace is used in the case when linker cannot + * identify the caller of dlopen/dlsym. This happens for the code not loaded + * by dynamic linker; for example calls from the mono-compiled code. There can + * be only one anonymous namespace in a process. If there already is an + * anonymous namespace in the process, using this flag when creating a new + * namespace causes an error. + */ + ANDROID_NAMESPACE_TYPE_ALSO_USED_AS_ANONYMOUS = 0x10000000, + ANDROID_NAMESPACE_TYPE_SHARED_ISOLATED = + ANDROID_NAMESPACE_TYPE_SHARED | ANDROID_NAMESPACE_TYPE_ISOLATED, +}; +/* + * Creates new linker namespace. + * ld_library_path and default_library_path represent the search path + * for the libraries in the namespace. + * + * The libraries in the namespace are searched by folowing order: + * 1. ld_library_path (Think of this as namespace-local LD_LIBRARY_PATH) + * 2. In directories specified by DT_RUNPATH of the "needed by" binary. + * 3. deault_library_path (This of this as namespace-local default library path) + * + * When type is ANDROID_NAMESPACE_TYPE_ISOLATED the resulting namespace requires all of + * the libraries to be on the search path or under the permitted_when_isolated_path; + * the search_path is ld_library_path:default_library_path. Note that the + * permitted_when_isolated_path path is not part of the search_path and + * does not affect the search order. It is a way to allow loading libraries from specific + * locations when using absolute path. + * If a library or any of its dependencies are outside of the permitted_when_isolated_path + * and search_path, and it is not part of the public namespace dlopen will fail. + */ +extern struct android_namespace_t* android_create_namespace( + const char* name, const char* ld_library_path, const char* default_library_path, uint64_t type, + const char* permitted_when_isolated_path, struct android_namespace_t* parent); +/* + * Creates a link between namespaces. Every link has list of sonames of + * shared libraries. These are the libraries which are accessible from + * namespace 'from' but loaded within namespace 'to' context. + * When to namespace is nullptr this function establishes a link between + * 'from' namespace and the default namespace. + * + * The lookup order of the libraries in namespaces with links is following: + * 1. Look inside current namespace using 'this' namespace search path. + * 2. Look in linked namespaces + * 2.1. Perform soname check - if library soname is not in the list of shared + * libraries sonames skip this link, otherwise + * 2.2. Search library using linked namespace search path. Note that this + * step will not go deeper into linked namespaces for this library but + * will do so for DT_NEEDED libraries. + */ +extern bool android_link_namespaces(struct android_namespace_t* from, + struct android_namespace_t* to, + const char* shared_libs_sonames); +extern struct android_namespace_t* android_get_exported_namespace(const char* name); +__END_DECLS +#endif // ART_LIBNATIVELOADER_INCLUDE_NATIVELOADER_DLEXT_NAMESPACES_H_