src/external/vmd_molfile/vmddlopen.cpp

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  21  *cr            (C) Copyright 1995-2009 The Board of Trustees of the
  22  *cr                        University of Illinois
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  25 Developed by:           Theoretical and Computational Biophysics Group
  26                         University of Illinois at Urbana-Champaign
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  56
  57 /***************************************************************************
  58  * RCS INFORMATION:
  59  *
  60  *      $RCSfile: vmddlopen.c,v $
  61  *      $Author: johns $        $Locker:  $             $State: Exp $
  62  *      $Revision: 1.18 $      $Date: 2009/07/07 02:40:05 $
  63  *
  64  ***************************************************************************
  65  * DESCRIPTION:
  66  *   Routines for loading dynamic link libraries and shared object files
  67  *   on various platforms, abstracting from machine dependent APIs.
  68  *
  69  ***************************************************************************/
  70
  71 #include <stdio.h>
  72 #include <stdlib.h>
  73 #include <string.h>
  74 #include "vmddlopen.h"
  75
  76 #if defined(__hpux)
  77
  78 #include <dl.h>
  79 #include <errno.h>
  80 #include <string.h>
  81
  82 void *vmddlopen( const char *path) {
  83     void *ret;
  84     ret = shl_load( path, BIND_IMMEDIATE | BIND_FIRST | BIND_VERBOSE, 0);
  85     return ret;
  86 }
  87
  88 int vmddlclose( void *handle ) {
  89     return shl_unload( (shl_t) handle );
  90 }
  91
  92 void *vmddlsym( void *handle, const char *sym ) {
  93     void *value=0;
  94
  95     if ( shl_findsym( (shl_t*)&handle, sym, TYPE_UNDEFINED, &value ) != 0 )
  96         return 0;
  97     return value;
  98 }
  99
 100 const char *vmddlerror( void  ) {
 101     return strerror( errno );
 102 }
 103
 104 #elif 0 && defined(__APPLE__)
 105 /*
 106  * This is only needed for MacOS X version 10.3 or older
 107  */
 108 #include <mach-o/dyld.h>
 109
 110 void *vmddlopen( const char *path) {
 111   NSObjectFileImage image;
 112   NSObjectFileImageReturnCode retval;
 113   NSModule module;
 114
 115   retval = NSCreateObjectFileImageFromFile(path, &image);
 116   if (retval != NSObjectFileImageSuccess)
 117     return NULL;
 118
 119   module = NSLinkModule(image, path,
 120             NSLINKMODULE_OPTION_BINDNOW | NSLINKMODULE_OPTION_PRIVATE
 121             | NSLINKMODULE_OPTION_RETURN_ON_ERROR);
 122   return module;  /* module will be NULL on error */
 123 }
 124
 125 int vmddlclose( void *handle ) {
 126   NSModule module = (NSModule *)handle;
 127   NSUnLinkModule(module, NSUNLINKMODULE_OPTION_NONE);
 128   return 0;
 129 }
 130
 131 void *vmddlsym( void *handle, const char *symname ) {
 132   char *realsymname;
 133   NSModule module;
 134   NSSymbol sym;
 135   /* Hack around the leading underscore in the symbol name */
 136   realsymname = (char *)malloc(strlen(symname)+2);
 137   strcpy(realsymname, "_");
 138   strcat(realsymname, symname);
 139   module = (NSModule)handle;
 140   sym = NSLookupSymbolInModule(module, realsymname);
 141   free(realsymname);
 142   if (sym)
 143     return (void *)(NSAddressOfSymbol(sym));
 144   return NULL;
 145 }
 146
 147 const char *vmddlerror( void  ) {
 148   NSLinkEditErrors c;
 149   int errorNumber;
 150   const char *fileName;
 151   const char *errorString = NULL;
 152   NSLinkEditError(&c, &errorNumber, &fileName, &errorString);
 153   return errorString;
 154 }
 155
 156 #elif defined( _WIN32 ) || defined( _WIN64 )
 157
 158 #include <windows.h>
 159
 160 void *vmddlopen(const char *fname) {
 161   return (void *)LoadLibrary(fname);
 162 }
 163
 164 const char *vmddlerror(void) {
 165   static CHAR szBuf[80];
 166   DWORD dw = GetLastError();
 167
 168   sprintf(szBuf, "vmddlopen failed: GetLastError returned %lu\n", dw);
 169   return szBuf;
 170 }
 171
 172 void *vmddlsym(void *h, const char *sym) {
 173   return (void *)GetProcAddress((HINSTANCE)h, sym);
 174 }
 175
 176 int vmddlclose(void *h) {
 177   /* FreeLibrary returns nonzero on success */
 178   return !FreeLibrary((HINSTANCE)h);
 179 }
 180
 181 #else
 182
 183 /* All remaining platforms (not Windows, HP-UX, or MacOS X <= 10.3) */
 184 #include <dlfcn.h>
 185
 186 void *vmddlopen(const char *fname) {
 187   return dlopen(fname, RTLD_NOW);
 188 }
 189 const char *vmddlerror(void) {
 190   return dlerror();
 191 }
 192 void *vmddlsym(void *h, const char *sym) {
 193   return dlsym(h, sym);
 194 }
 195 int vmddlclose(void *h) {
 196   return dlclose(h);
 197 }
 198 #endif