1 #pragma once 2 3 namespace blobs 4 { 5 6 namespace internal 7 { 8 /** 9 * Interface to the dynamic library loader. 10 */ 11 class DlSysInterface 12 { 13 public: 14 virtual ~DlSysInterface() = default; 15 16 /** 17 * obtain error diagnostic for functions in the dlopen API 18 * 19 * @return the error details 20 */ 21 virtual const char* dlerror() const = 0; 22 23 /** 24 * open a shared object 25 * 26 * @param[in] filename - the path to the shared object or the filename to 27 * for searching 28 * @param[in] flags - the flags 29 * @return a handle to the shared object (null on failure) 30 */ 31 virtual void* dlopen(const char* filename, int flags) const = 0; 32 33 /** 34 * obtain address of a symbol in a shared object or executable 35 * 36 * @param[in] handle - pointer to shared object 37 * @param[in] symbol - name of the symbol to find 38 * @return the address of the symbol if found (null otherwise) 39 */ 40 virtual void* dlsym(void* handle, const char* symbol) const = 0; 41 }; 42 43 class DlSysImpl : public DlSysInterface 44 { 45 public: 46 const char* dlerror() const override; 47 void* dlopen(const char* filename, int flags) const override; 48 void* dlsym(void* handle, const char* symbol) const override; 49 }; 50 51 extern DlSysImpl dlsys_impl; 52 53 } // namespace internal 54 } // namespace blobs 55