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Merge "Introducing linker namespaces"

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This commit is contained in:
Dimitry Ivanov
2015-11-16 20:14:37 +00:00
committed by Gerrit Code Review
parent 1b42c54471 42d5fcb9f4
commit 1f0ccbb59c
26 changed files with 1122 additions and 152 deletions
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40
libc/include/android/dlext.h
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@@ -98,6 +98,11 @@ enum {
*/
ANDROID_DLEXT_LOAD_AT_FIXED_ADDRESS = 0x100,
/* This flag used to load library in a different namespace. The namespace is
* specified in library_namespace.
*/
ANDROID_DLEXT_USE_NAMESPACE = 0x200,
/* Mask of valid bits */
ANDROID_DLEXT_VALID_FLAG_BITS = ANDROID_DLEXT_RESERVED_ADDRESS |
ANDROID_DLEXT_RESERVED_ADDRESS_HINT |
@@ -107,9 +112,12 @@ enum {
ANDROID_DLEXT_USE_LIBRARY_FD_OFFSET |
ANDROID_DLEXT_FORCE_LOAD |
ANDROID_DLEXT_FORCE_FIXED_VADDR |
ANDROID_DLEXT_LOAD_AT_FIXED_ADDRESS,
ANDROID_DLEXT_LOAD_AT_FIXED_ADDRESS |
ANDROID_DLEXT_USE_NAMESPACE,
};
struct android_namespace_t;
typedef struct {
uint64_t flags;
void* reserved_addr;
@@ -117,10 +125,40 @@ typedef struct {
int relro_fd;
int library_fd;
off64_t library_fd_offset;
struct android_namespace_t* library_namespace;
} android_dlextinfo;
extern void* android_dlopen_ext(const char* filename, int flag, const android_dlextinfo* extinfo);
/*
* Initializes public namespace. The path is the list of sonames
* separated by colon. Example: "libc.so:libm.so:libdl.so".
*
* The libraries in this list should be loaded prior to this call.
*/
extern bool android_init_public_namespace(const char* path);
/*
* 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 is_isolated is true the resulted namespace requires all of the libraries
* to be on the search path; the search_path is ld_library_path:default_library_path.
*
* If a library or any of its dependencies are outside of the search path and 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,
bool is_isolated);
__END_DECLS
#endif /* __ANDROID_DLEXT_H__ */