root/src/dl_darwin.c

DEFINITIONS

1. dl_open
2. dl_error
3. dl_sym
4. dl_close

   1 /*
   2  * dl_darwin.c - dlopen() interface for MacOS X/Darwin
   3  *
   4  *   Copyright (c) 2000-2003 Shiro Kawai, All rights reserved.
   5  * 
   6  *   Redistribution and use in source and binary forms, with or without
   7  *   modification, are permitted provided that the following conditions
   8  *   are met:
   9  * 
  10  *   1. Redistributions of source code must retain the above copyright
  11  *      notice, this list of conditions and the following disclaimer.
  12  *
  13  *   2. Redistributions in binary form must reproduce the above copyright
  14  *      notice, this list of conditions and the following disclaimer in the
  15  *      documentation and/or other materials provided with the distribution.
  16  *
  17  *   3. Neither the name of the authors nor the names of its contributors
  18  *      may be used to endorse or promote products derived from this
  19  *      software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  27  *   TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  28  *   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  29  *   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  30  *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  31  *   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  *
  33  *  $Id: dl_darwin.c,v 1.4 2003/07/05 03:29:12 shirok Exp $
  34  */
  36 /* Cf: Technical Note TN2071 "Porting Command Line Unix Tools to MacOS X"
  37    http://developer.apple.com/technotes/tn2002/tn2071.html
  38    Cf: Object File Image Functions
  39    http://developer.apple.com/techpubs/macosx/DeveloperTools/MachORuntime/5rt_api_reference/chapter_5_section_3.html
  40 */
  42 /* This file is included in load.c */
  44 /* NB: This isn't really used for now, since GC requires a special wrapper
  45    around dlopen() and we can't casually replace it.  I need to tweak
  46    GC's external API so that we can safely wrap these calls. */
  48 #include <mach-o/dyld.h>
  50 /* we can store the error message in static variable, because
  51    the caller guarantees dl_open() and subsequent dl_error()
  52    (in case dl_open() fails) is atomic. */
  53 static const char *dl_open_errstr = NULL;
  55 static void *dl_open(const char *path)
  56 {
NSObjectFileImage image;
NSObjectFileImageReturnCode r;
NSModule module;
  60     unsigned long options = NSLINKMODULE_OPTION_BINDNOW|NSLINKMODULE_OPTION_RETURN_ON_ERROR;
r = NSCreateObjectFileImageFromFile(path, &image);
  63     if (r != NSObjectFileImageSuccess) {
  64         switch (r) {
  65         case NSObjectFileImageInappropriateFile:
dl_open_errstr = "The specified Mach-O file is not of a type this function can operate upon.";
  67             break;
  68         case NSObjectFileImageArch:
dl_open_errstr = "The specified Mach-O file is for a different CPU architecture.";
  70             break;
  71         case NSObjectFileImageFormat:
dl_open_errstr = "The specified file does not appear to be a Mach-O file.";
  73             break;
  74         case NSObjectFileImageAccess:
dl_open_errstr = "The access permissions for the specified file do not permit the creation of the image.";
  76             break;
  77         default:
dl_open_errstr = "Unknown error.";
  79             break;
  80         }
  81         return NULL;
  82     }
module = NSLinkModule(image, path, options);
NSDestroyObjectFileImage(image);
  86     if (module == NULL) {
dl_open_errstr = "NSLinkModule failed";
  88     }
  89     return module;
  90 }
  92 static const char *dl_error(void)
  93 {
  94     return dl_open_errstr;
  95 }
  97 static ScmDynLoadInitFn dl_sym(void *handle, const char *name)
  98 {
NSSymbol sym = NSLookupSymbolInModule((NSModule)handle, name);
 100     if (sym == NULL) return NULL;
 101     return (ScmDynLoadInitFn)NSAddressOfSymbol(sym);
 102 }
 104 static void dl_close(void *handle)
 105 {
 106     (void)NSUnLinkModule((NSModule)handle, NSUNLINKMODULE_OPTION_NONE);
 107 }