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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef CRAZY_LINKER_H | 5 #ifndef CRAZY_LINKER_H |
| 6 #define CRAZY_LINKER_H | 6 #define CRAZY_LINKER_H |
| 7 | 7 |
| 8 // This is the crazy linker, a custom dynamic linker that can be used | 8 // This is the crazy linker, a custom dynamic linker that can be used |
| 9 // by NDK applications to load shared libraries (not executables) with | 9 // by NDK applications to load shared libraries (not executables) with |
| 10 // a twist. | 10 // a twist. |
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| 25 #include <stddef.h> | 25 #include <stddef.h> |
| 26 | 26 |
| 27 #ifdef __cplusplus | 27 #ifdef __cplusplus |
| 28 extern "C" { | 28 extern "C" { |
| 29 #endif | 29 #endif |
| 30 | 30 |
| 31 // Function attribute to indicate that it needs to be exported by | 31 // Function attribute to indicate that it needs to be exported by |
| 32 // the library. | 32 // the library. |
| 33 #define _CRAZY_PUBLIC __attribute__((__visibility__("default"))) | 33 #define _CRAZY_PUBLIC __attribute__((__visibility__("default"))) |
| 34 | 34 |
| 35 // Maximum path length of a file in a zip file. |
| 36 const size_t kMaxFilePathLengthInZip = 256; |
| 37 |
| 35 // Status values returned by crazy linker functions to indicate | 38 // Status values returned by crazy linker functions to indicate |
| 36 // success or failure. They were chosen to match boolean values, | 39 // success or failure. They were chosen to match boolean values, |
| 37 // this allows one to test for failures with: | 40 // this allows one to test for failures with: |
| 38 // | 41 // |
| 39 // if (!crazy_linker_function(....)) { | 42 // if (!crazy_linker_function(....)) { |
| 40 // ... an error occured. | 43 // ... an error occured. |
| 41 // } | 44 // } |
| 42 // | 45 // |
| 43 // If the function called used a crazy_context_t, it is possible to | 46 // If the function called used a crazy_context_t, it is possible to |
| 44 // retrieve the error details with crazy_context_get_error(). | 47 // retrieve the error details with crazy_context_get_error(). |
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| 328 // Note that this works even if the memory is inside a system library that | 331 // Note that this works even if the memory is inside a system library that |
| 329 // was not previously opened with crazy_library_open(). | 332 // was not previously opened with crazy_library_open(). |
| 330 // |address| is the memory address. | 333 // |address| is the memory address. |
| 331 // On success, returns CRAZY_STATUS_SUCCESS and sets |*library|. | 334 // On success, returns CRAZY_STATUS_SUCCESS and sets |*library|. |
| 332 // The caller muyst call crazy_library_close() once it's done with the | 335 // The caller muyst call crazy_library_close() once it's done with the |
| 333 // library. | 336 // library. |
| 334 crazy_status_t crazy_library_find_from_address( | 337 crazy_status_t crazy_library_find_from_address( |
| 335 void* address, | 338 void* address, |
| 336 crazy_library_t** library) _CRAZY_PUBLIC; | 339 crazy_library_t** library) _CRAZY_PUBLIC; |
| 337 | 340 |
| 341 // Return the full path of |lib_name| in the zip file |
| 342 // (lib/<abi>/crazy.<lib_name>). The result is returned in |
| 343 // |buffer[0..buffer_size - 1]|. If |buffer_size| is too small, |
| 344 // CRAZY_STATUS_FAILURE is returned. |
| 345 crazy_status_t crazy_library_file_path_in_zip_file(const char* lib_name, |
| 346 char* buffer, |
| 347 size_t buffer_size) |
| 348 _CRAZY_PUBLIC; |
| 349 |
| 338 // Check whether |lib_name| is page aligned in |zipfile_name|. | 350 // Check whether |lib_name| is page aligned in |zipfile_name|. |
| 339 crazy_status_t crazy_linker_check_library_aligned_in_zip_file( | 351 crazy_status_t crazy_linker_check_library_aligned_in_zip_file( |
| 340 const char* zipfile_name, | 352 const char* zipfile_name, |
| 341 const char* lib_name) _CRAZY_PUBLIC; | 353 const char* lib_name) _CRAZY_PUBLIC; |
| 342 | 354 |
| 343 // Close a library. This decrements its reference count. If it reaches | 355 // Close a library. This decrements its reference count. If it reaches |
| 344 // zero, the library be unloaded from the process. | 356 // zero, the library be unloaded from the process. |
| 345 void crazy_library_close(crazy_library_t* library) _CRAZY_PUBLIC; | 357 void crazy_library_close(crazy_library_t* library) _CRAZY_PUBLIC; |
| 346 | 358 |
| 347 // Close a library, with associated context to support delayed operations. | 359 // Close a library, with associated context to support delayed operations. |
| 348 void crazy_library_close_with_context(crazy_library_t* library, | 360 void crazy_library_close_with_context(crazy_library_t* library, |
| 349 crazy_context_t* context) _CRAZY_PUBLIC; | 361 crazy_context_t* context) _CRAZY_PUBLIC; |
| 350 | 362 |
| 351 #ifdef __cplusplus | 363 #ifdef __cplusplus |
| 352 } /* extern "C" */ | 364 } /* extern "C" */ |
| 353 #endif | 365 #endif |
| 354 | 366 |
| 355 #endif /* CRAZY_LINKER_H */ | 367 #endif /* CRAZY_LINKER_H */ |
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