diff options
Diffstat (limited to 'libsanitizer/interception/interception.h')
| -rw-r--r-- | libsanitizer/interception/interception.h | 52 |
1 files changed, 20 insertions, 32 deletions
diff --git a/libsanitizer/interception/interception.h b/libsanitizer/interception/interception.h index ccf5e1b1ec0..b4c4137e88e 100644 --- a/libsanitizer/interception/interception.h +++ b/libsanitizer/interception/interception.h @@ -17,7 +17,7 @@ # error "Interception doesn't work on this operating system." #endif -#include "sanitizer/common_interface_defs.h" +#include "sanitizer_common/sanitizer_internal_defs.h" // These typedefs should be used only in the interceptor definitions to replace // the standard system types (e.g. SSIZE_T instead of ssize_t) @@ -25,21 +25,17 @@ typedef __sanitizer::uptr SIZE_T; typedef __sanitizer::sptr SSIZE_T; typedef __sanitizer::sptr PTRDIFF_T; typedef __sanitizer::s64 INTMAX_T; -typedef __sanitizer::u64 OFF_T; +// WARNING: OFF_T may be different from OS type off_t, depending on the value of +// _FILE_OFFSET_BITS. This definition of OFF_T matches the ABI of system calls +// like pread and mmap, as opposed to pread64 and mmap64. +// Mac is special. +#ifdef __APPLE__ +typedef __sanitizer::u64 OFF_T; +#else +typedef __sanitizer::uptr OFF_T; +#endif typedef __sanitizer::u64 OFF64_T; -// How to use this library: -// 1) Include this header to define your own interceptors -// (see details below). -// 2) Build all *.cc files and link against them. -// On Mac you will also need to: -// 3) Provide your own implementation for the following functions: -// mach_error_t __interception::allocate_island(void **ptr, -// size_t size, -// void *hint); -// mach_error_t __interception::deallocate_island(void *ptr); -// See "interception_mac.h" for more details. - // How to add an interceptor: // Suppose you need to wrap/replace system function (generally, from libc): // int foo(const char *bar, double baz); @@ -80,20 +76,12 @@ typedef __sanitizer::u64 OFF64_T; // This is not so on Mac OS, where the two-level namespace makes // our replacement functions invisible to other libraries. This may be overcomed // using the DYLD_FORCE_FLAT_NAMESPACE, but some errors loading the shared -// libraries in Chromium were noticed when doing so. Instead we use -// mach_override, a handy framework for patching functions at runtime. -// To avoid possible name clashes, our replacement functions have -// the "wrap_" prefix on Mac. -// An alternative to function patching is to create a dylib containing a -// __DATA,__interpose section that associates library functions with their -// wrappers. When this dylib is preloaded before an executable using -// DYLD_INSERT_LIBRARIES, it routes all the calls to interposed functions done -// through stubs to the wrapper functions. Such a library is built with -// -DMAC_INTERPOSE_FUNCTIONS=1. - -#if !defined(MAC_INTERPOSE_FUNCTIONS) || !defined(__APPLE__) -# define MAC_INTERPOSE_FUNCTIONS 0 -#endif +// libraries in Chromium were noticed when doing so. +// Instead we create a dylib containing a __DATA,__interpose section that +// associates library functions with their wrappers. When this dylib is +// preloaded before an executable using DYLD_INSERT_LIBRARIES, it routes all +// the calls to interposed functions done through stubs to the wrapper +// functions. #if defined(__APPLE__) # define WRAP(x) wrap_##x @@ -120,7 +108,7 @@ typedef __sanitizer::u64 OFF64_T; __attribute__((weak, alias("__interceptor_" #func), visibility("default"))); #endif -#if !MAC_INTERPOSE_FUNCTIONS +#if !defined(__APPLE__) # define PTR_TO_REAL(x) real_##x # define REAL(x) __interception::PTR_TO_REAL(x) # define FUNC_TYPE(x) x##_f @@ -130,11 +118,11 @@ typedef __sanitizer::u64 OFF64_T; namespace __interception { \ extern FUNC_TYPE(func) PTR_TO_REAL(func); \ } -#else // MAC_INTERPOSE_FUNCTIONS +#else // __APPLE__ # define REAL(x) x # define DECLARE_REAL(ret_type, func, ...) \ extern "C" ret_type func(__VA_ARGS__); -#endif // MAC_INTERPOSE_FUNCTIONS +#endif // __APPLE__ #define DECLARE_REAL_AND_INTERCEPTOR(ret_type, func, ...) \ DECLARE_REAL(ret_type, func, __VA_ARGS__) \ @@ -144,7 +132,7 @@ typedef __sanitizer::u64 OFF64_T; // macros does its job. In exceptional cases you may need to call REAL(foo) // without defining INTERCEPTOR(..., foo, ...). For example, if you override // foo with an interceptor for other function. -#if !MAC_INTERPOSE_FUNCTIONS +#if !defined(__APPLE__) # define DEFINE_REAL(ret_type, func, ...) \ typedef ret_type (*FUNC_TYPE(func))(__VA_ARGS__); \ namespace __interception { \ |
