1 /*
2 File: CASharedLibrary.cpp
3 Abstract: CASharedLibrary.h
4 Version: 1.1
5
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44 Copyright (C) 2014 Apple Inc. All Rights Reserved.
45
46 */
47 //=============================================================================
48 // Includes
49 //=============================================================================
50
51 #include "CASharedLibrary.h"
52
53 //#define CASharedLibrary_Use_DYLD 1
54 #if CASharedLibrary_Use_DYLD
55 #include <mach-o/dyld.h>
56 #else
57 #include <dlfcn.h>
58 #include <stddef.h>
59 #endif
60
61 //=============================================================================
62 // CASharedLibrary
63 //=============================================================================
64
LoadLibraryAndGetRoutineAddress(const char * inRoutineName,const char *,const char * inLibraryPath)65 void* CASharedLibrary::LoadLibraryAndGetRoutineAddress(const char* inRoutineName, const char* /*inLibraryName*/, const char* inLibraryPath)
66 {
67 void* theRoutine = 0;
68
69 #if CASharedLibrary_Use_DYLD
70 const struct mach_header* theImage = NSAddImage(inLibraryPath, NSADDIMAGE_OPTION_RETURN_ON_ERROR);
71 if(theImage != 0)
72 {
73 NSSymbol theSymbol = NSLookupSymbolInImage(theImage, inRoutineName, NSLOOKUPSYMBOLINIMAGE_OPTION_BIND);
74 if(theSymbol != 0)
75 {
76 theRoutine = NSAddressOfSymbol(theSymbol);
77 }
78 }
79 #else
80 void* theImage = dlopen(inLibraryPath, RTLD_LAZY);
81 if(theImage != NULL)
82 {
83 // we assume that all routine names passed here have a leading underscore which gets shaved
84 // off when passed to dlsym
85 theRoutine = dlsym(theImage, &(inRoutineName[1]));
86 }
87
88 #endif
89
90 return theRoutine;
91 }
92
GetRoutineAddressIfLibraryLoaded(const char * inRoutineName,const char *,const char * inLibraryPath)93 void* CASharedLibrary::GetRoutineAddressIfLibraryLoaded(const char* inRoutineName, const char* /*inLibraryName*/, const char* inLibraryPath)
94 {
95 void* theRoutine = 0;
96
97 #if CASharedLibrary_Use_DYLD
98 const struct mach_header* theImage = NSAddImage(inLibraryPath, NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED);
99 if(theImage != 0)
100 {
101 NSSymbol theSymbol = NSLookupSymbolInImage(theImage, inRoutineName, NSLOOKUPSYMBOLINIMAGE_OPTION_BIND);
102 if(theSymbol != 0)
103 {
104 theRoutine = NSAddressOfSymbol(theSymbol);
105 }
106 }
107 #else
108 void* theImage = dlopen(inLibraryPath, RTLD_LAZY | RTLD_NOLOAD);
109 if(theImage != NULL)
110 {
111 // we assume that all routine names passed here have a leading underscore which gets shaved
112 // off when passed to dlsym
113 theRoutine = dlsym(theImage, &(inRoutineName[1]));
114 }
115 #endif
116
117 return theRoutine;
118 }
119