| /* |
| Copyright (c) 2002 Peter O'Gorman <ogorman@users.sourceforge.net> |
| |
| Permission is hereby granted, free of charge, to any person obtaining |
| a copy of this software and associated documentation files (the |
| "Software"), to deal in the Software without restriction, including |
| without limitation the rights to use, copy, modify, merge, publish, |
| distribute, sublicense, and/or sell copies of the Software, and to |
| permit persons to whom the Software is furnished to do so, subject to |
| the following conditions: |
| |
| The above copyright notice and this permission notice shall be |
| included in all copies or substantial portions of the Software. |
| |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
| LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
| OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
| WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| |
| |
| /* Just to prove that it isn't that hard to add Mac calls to your code :) |
| This works with pretty much everything, including kde3 xemacs and the gimp, |
| I'd guess that it'd work in at least 95% of cases, use this as your starting |
| point, rather than the mess that is dlfcn.c, assuming that your code does not |
| require ref counting or symbol lookups in dependent libraries |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <stdarg.h> |
| #include <limits.h> |
| #include <mach-o/dyld.h> |
| #include <AvailabilityMacros.h> |
| #include "dlfcn.h" |
| |
| #ifdef CTYPES_DARWIN_DLFCN |
| |
| #define ERR_STR_LEN 256 |
| |
| #ifndef MAC_OS_X_VERSION_10_3 |
| #define MAC_OS_X_VERSION_10_3 1030 |
| #endif |
| |
| #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_3 |
| #define DARWIN_HAS_DLOPEN |
| extern void * dlopen(const char *path, int mode) __attribute__((weak_import)); |
| extern void * dlsym(void * handle, const char *symbol) __attribute__((weak_import)); |
| extern const char * dlerror(void) __attribute__((weak_import)); |
| extern int dlclose(void * handle) __attribute__((weak_import)); |
| extern int dladdr(const void *, Dl_info *) __attribute__((weak_import)); |
| #endif /* MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_3 */ |
| |
| #ifndef DARWIN_HAS_DLOPEN |
| #define dlopen darwin_dlopen |
| #define dlsym darwin_dlsym |
| #define dlerror darwin_dlerror |
| #define dlclose darwin_dlclose |
| #define dladdr darwin_dladdr |
| #endif |
| |
| void * (*ctypes_dlopen)(const char *path, int mode); |
| void * (*ctypes_dlsym)(void * handle, const char *symbol); |
| const char * (*ctypes_dlerror)(void); |
| int (*ctypes_dlclose)(void * handle); |
| int (*ctypes_dladdr)(const void *, Dl_info *); |
| |
| #if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_3 |
| /* Mac OS X 10.3+ has dlopen, so strip all this dead code to avoid warnings */ |
| |
| static void *dlsymIntern(void *handle, const char *symbol); |
| |
| static const char *error(int setget, const char *str, ...); |
| |
| /* Set and get the error string for use by dlerror */ |
| static const char *error(int setget, const char *str, ...) |
| { |
| static char errstr[ERR_STR_LEN]; |
| static int err_filled = 0; |
| const char *retval; |
| va_list arg; |
| if (setget == 0) |
| { |
| va_start(arg, str); |
| strncpy(errstr, "dlcompat: ", ERR_STR_LEN); |
| vsnprintf(errstr + 10, ERR_STR_LEN - 10, str, arg); |
| va_end(arg); |
| err_filled = 1; |
| retval = NULL; |
| } |
| else |
| { |
| if (!err_filled) |
| retval = NULL; |
| else |
| retval = errstr; |
| err_filled = 0; |
| } |
| return retval; |
| } |
| |
| /* darwin_dlopen */ |
| static void *darwin_dlopen(const char *path, int mode) |
| { |
| void *module = 0; |
| NSObjectFileImage ofi = 0; |
| NSObjectFileImageReturnCode ofirc; |
| |
| /* If we got no path, the app wants the global namespace, use -1 as the marker |
| in this case */ |
| if (!path) |
| return (void *)-1; |
| |
| /* Create the object file image, works for things linked with the -bundle arg to ld */ |
| ofirc = NSCreateObjectFileImageFromFile(path, &ofi); |
| switch (ofirc) |
| { |
| case NSObjectFileImageSuccess: |
| /* It was okay, so use NSLinkModule to link in the image */ |
| module = NSLinkModule(ofi, path, |
| NSLINKMODULE_OPTION_RETURN_ON_ERROR |
| | (mode & RTLD_GLOBAL) ? 0 : NSLINKMODULE_OPTION_PRIVATE |
| | (mode & RTLD_LAZY) ? 0 : NSLINKMODULE_OPTION_BINDNOW); |
| NSDestroyObjectFileImage(ofi); |
| break; |
| case NSObjectFileImageInappropriateFile: |
| /* It may have been a dynamic library rather than a bundle, try to load it */ |
| module = (void *)NSAddImage(path, NSADDIMAGE_OPTION_RETURN_ON_ERROR); |
| break; |
| default: |
| /* God knows what we got */ |
| error(0, "Can not open \"%s\"", path); |
| return 0; |
| } |
| if (!module) |
| error(0, "Can not open \"%s\"", path); |
| return module; |
| |
| } |
| |
| /* dlsymIntern is used by dlsym to find the symbol */ |
| static void *dlsymIntern(void *handle, const char *symbol) |
| { |
| NSSymbol nssym = 0; |
| /* If the handle is -1, if is the app global context */ |
| if (handle == (void *)-1) |
| { |
| /* Global context, use NSLookupAndBindSymbol */ |
| if (NSIsSymbolNameDefined(symbol)) |
| { |
| nssym = NSLookupAndBindSymbol(symbol); |
| } |
| |
| } |
| /* Now see if the handle is a struch mach_header* or not, use NSLookupSymbol in image |
| for libraries, and NSLookupSymbolInModule for bundles */ |
| else |
| { |
| /* Check for both possible magic numbers depending on x86/ppc byte order */ |
| if ((((struct mach_header *)handle)->magic == MH_MAGIC) || |
| (((struct mach_header *)handle)->magic == MH_CIGAM)) |
| { |
| if (NSIsSymbolNameDefinedInImage((struct mach_header *)handle, symbol)) |
| { |
| nssym = NSLookupSymbolInImage((struct mach_header *)handle, |
| symbol, |
| NSLOOKUPSYMBOLINIMAGE_OPTION_BIND |
| | NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR); |
| } |
| |
| } |
| else |
| { |
| nssym = NSLookupSymbolInModule(handle, symbol); |
| } |
| } |
| if (!nssym) |
| { |
| error(0, "Symbol \"%s\" Not found", symbol); |
| return NULL; |
| } |
| return NSAddressOfSymbol(nssym); |
| } |
| |
| static const char *darwin_dlerror(void) |
| { |
| return error(1, (char *)NULL); |
| } |
| |
| static int darwin_dlclose(void *handle) |
| { |
| if ((((struct mach_header *)handle)->magic == MH_MAGIC) || |
| (((struct mach_header *)handle)->magic == MH_CIGAM)) |
| { |
| error(0, "Can't remove dynamic libraries on darwin"); |
| return 0; |
| } |
| if (!NSUnLinkModule(handle, 0)) |
| { |
| error(0, "unable to unlink module %s", NSNameOfModule(handle)); |
| return 1; |
| } |
| return 0; |
| } |
| |
| |
| /* dlsym, prepend the underscore and call dlsymIntern */ |
| static void *darwin_dlsym(void *handle, const char *symbol) |
| { |
| static char undersym[257]; /* Saves calls to malloc(3) */ |
| int sym_len = strlen(symbol); |
| void *value = NULL; |
| char *malloc_sym = NULL; |
| |
| if (sym_len < 256) |
| { |
| snprintf(undersym, 256, "_%s", symbol); |
| value = dlsymIntern(handle, undersym); |
| } |
| else |
| { |
| malloc_sym = malloc(sym_len + 2); |
| if (malloc_sym) |
| { |
| sprintf(malloc_sym, "_%s", symbol); |
| value = dlsymIntern(handle, malloc_sym); |
| free(malloc_sym); |
| } |
| else |
| { |
| error(0, "Unable to allocate memory"); |
| } |
| } |
| return value; |
| } |
| |
| static int darwin_dladdr(const void *handle, Dl_info *info) { |
| return 0; |
| } |
| #endif /* MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_3 */ |
| |
| #if __GNUC__ < 4 |
| #pragma CALL_ON_LOAD ctypes_dlfcn_init |
| #else |
| static void __attribute__ ((constructor)) ctypes_dlfcn_init(void); |
| static |
| #endif |
| void ctypes_dlfcn_init(void) { |
| if (dlopen != NULL) { |
| ctypes_dlsym = dlsym; |
| ctypes_dlopen = dlopen; |
| ctypes_dlerror = dlerror; |
| ctypes_dlclose = dlclose; |
| ctypes_dladdr = dladdr; |
| } else { |
| #if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_3 |
| ctypes_dlsym = darwin_dlsym; |
| ctypes_dlopen = darwin_dlopen; |
| ctypes_dlerror = darwin_dlerror; |
| ctypes_dlclose = darwin_dlclose; |
| ctypes_dladdr = darwin_dladdr; |
| #endif /* MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_3 */ |
| } |
| } |
| |
| #endif /* CTYPES_DARWIN_DLFCN */ |