1/* 2Copyright (c) 2002 Peter O'Gorman <ogorman@users.sourceforge.net> 3 4Permission is hereby granted, free of charge, to any person obtaining 5a copy of this software and associated documentation files (the 6"Software"), to deal in the Software without restriction, including 7without limitation the rights to use, copy, modify, merge, publish, 8distribute, sublicense, and/or sell copies of the Software, and to 9permit persons to whom the Software is furnished to do so, subject to 10the following conditions: 11 12The above copyright notice and this permission notice shall be 13included in all copies or substantial portions of the Software. 14 15THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 16EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 17MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 18NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 19LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 20OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 21WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 22*/ 23 24 25/* Just to prove that it isn't that hard to add Mac calls to your code :) 26 This works with pretty much everything, including kde3 xemacs and the gimp, 27 I'd guess that it'd work in at least 95% of cases, use this as your starting 28 point, rather than the mess that is dlfcn.c, assuming that your code does not 29 require ref counting or symbol lookups in dependent libraries 30*/ 31 32#include <stdio.h> 33#include <stdlib.h> 34#include <string.h> 35#include <sys/types.h> 36#include <sys/stat.h> 37#include <stdarg.h> 38#include <limits.h> 39#include <mach-o/dyld.h> 40#include "dlfcn_simple.h" 41 42#define ERR_STR_LEN 256 43 44static void *dlsymIntern(void *handle, const char *symbol); 45 46static const char *error(int setget, const char *str, ...); 47 48 49 50/* Set and get the error string for use by dlerror */ 51static const char *error(int setget, const char *str, ...) 52{ 53 static char errstr[ERR_STR_LEN]; 54 static int err_filled = 0; 55 const char *retval; 56 va_list arg; 57 if (setget == 0) 58 { 59 va_start(arg, str); 60 strncpy(errstr, "dlcompat: ", ERR_STR_LEN); 61 vsnprintf(errstr + 10, ERR_STR_LEN - 10, str, arg); 62 va_end(arg); 63 err_filled = 1; 64 retval = NULL; 65 } 66 else 67 { 68 if (!err_filled) 69 retval = NULL; 70 else 71 retval = errstr; 72 err_filled = 0; 73 } 74 return retval; 75} 76 77/* dlopen */ 78void *dlopen(const char *path, int mode) 79{ 80 void *module = 0; 81 NSObjectFileImage ofi = 0; 82 NSObjectFileImageReturnCode ofirc; 83 84 /* If we got no path, the app wants the global namespace, use -1 as the marker 85 in this case */ 86 if (!path) 87 return (void *)-1; 88 89 /* Create the object file image, works for things linked with the -bundle arg to ld */ 90 ofirc = NSCreateObjectFileImageFromFile(path, &ofi); 91 switch (ofirc) 92 { 93 case NSObjectFileImageSuccess: 94 /* It was okay, so use NSLinkModule to link in the image */ 95 module = NSLinkModule(ofi, path, 96 NSLINKMODULE_OPTION_RETURN_ON_ERROR 97 | (mode & RTLD_GLOBAL) ? 0 : NSLINKMODULE_OPTION_PRIVATE 98 | (mode & RTLD_LAZY) ? 0 : NSLINKMODULE_OPTION_BINDNOW); 99 NSDestroyObjectFileImage(ofi); 100 break; 101 case NSObjectFileImageInappropriateFile: 102 /* It may have been a dynamic library rather than a bundle, try to load it */ 103 module = (void *)NSAddImage(path, NSADDIMAGE_OPTION_RETURN_ON_ERROR); 104 break; 105 default: 106 /* God knows what we got */ 107 error(0, "Can not open \"%s\"", path); 108 return 0; 109 } 110 if (!module) 111 error(0, "Can not open \"%s\"", path); 112 return module; 113 114} 115 116/* dlsymIntern is used by dlsym to find the symbol */ 117void *dlsymIntern(void *handle, const char *symbol) 118{ 119 NSSymbol *nssym = 0; 120 /* If the handle is -1, if is the app global context */ 121 if (handle == (void *)-1) 122 { 123 /* Global context, use NSLookupAndBindSymbol */ 124 if (NSIsSymbolNameDefined(symbol)) 125 { 126 nssym = NSLookupAndBindSymbol(symbol); 127 } 128 129 } 130 /* Now see if the handle is a struch mach_header* or not, use NSLookupSymbol in image 131 for libraries, and NSLookupSymbolInModule for bundles */ 132 else 133 { 134 /* Check for both possible magic numbers depending on x86/ppc byte order */ 135 if ((((struct mach_header *)handle)->magic == MH_MAGIC) || 136 (((struct mach_header *)handle)->magic == MH_CIGAM)) 137 { 138 if (NSIsSymbolNameDefinedInImage((struct mach_header *)handle, symbol)) 139 { 140 nssym = NSLookupSymbolInImage((struct mach_header *)handle, 141 symbol, 142 NSLOOKUPSYMBOLINIMAGE_OPTION_BIND 143 | NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR); 144 } 145 146 } 147 else 148 { 149 nssym = NSLookupSymbolInModule(handle, symbol); 150 } 151 } 152 if (!nssym) 153 { 154 error(0, "Symbol \"%s\" Not found", symbol); 155 return NULL; 156 } 157 return NSAddressOfSymbol(nssym); 158} 159 160const char *dlerror(void) 161{ 162 return error(1, (char *)NULL); 163} 164 165int dlclose(void *handle) 166{ 167 if ((((struct mach_header *)handle)->magic == MH_MAGIC) || 168 (((struct mach_header *)handle)->magic == MH_CIGAM)) 169 { 170 error(0, "Can't remove dynamic libraries on darwin"); 171 return 0; 172 } 173 if (!NSUnLinkModule(handle, 0)) 174 { 175 error(0, "unable to unlink module %s", NSNameOfModule(handle)); 176 return 1; 177 } 178 return 0; 179} 180 181 182/* dlsym, prepend the underscore and call dlsymIntern */ 183void *dlsym(void *handle, const char *symbol) 184{ 185 static char undersym[257]; /* Saves calls to malloc(3) */ 186 int sym_len = strlen(symbol); 187 void *value = NULL; 188 char *malloc_sym = NULL; 189 190 if (sym_len < 256) 191 { 192 snprintf(undersym, 256, "_%s", symbol); 193 value = dlsymIntern(handle, undersym); 194 } 195 else 196 { 197 malloc_sym = malloc(sym_len + 2); 198 if (malloc_sym) 199 { 200 sprintf(malloc_sym, "_%s", symbol); 201 value = dlsymIntern(handle, malloc_sym); 202 free(malloc_sym); 203 } 204 else 205 { 206 error(0, "Unable to allocate memory"); 207 } 208 } 209 return value; 210} 211