/* dynlib.c -- foreign function interface, dynamically loadable libraries */ #include "mlvalues.h"#include "fail.h"#if defined(macintosh)#include <CodeFragments.h>#include <Errors.h>#include "os_mac_str.h"#elif defined(WIN32)#include "windows.h"#elif defined(hpux)#include <dl.h>#include <errno.h>#else#include <dlfcn.h>#endif /* Ken Larsen (kla@it.dtu.dk) 1998-01-08 */ /* Doug Currie (e@flavors.com) 1998May06 Macintosh specific changes */ /* Sergei Romanenko 1998 Windows 95/NT specific code */ /* Peter Sestoft (sestoft@dina.kvl.dk)    1998 clean-up, documentation, and OSF/1   1999 HP-UX specific code */ #if defined(hpux)void hpux_error() {  switch (errno) {  case ENOEXEC:    failwith("Not a shared library, or format error");  case ENOSYM:    failwith("Symbol not found in shared library");  case EINVAL:    failwith("Invalid shared library handle");  case ENOMEM:    failwith("Not enough memory to load shared library");  case ENOENT:    failwith("Shared library does not exist");  case EACCES:    failwith("Insufficient permissions to load shared library");  default:    failwith("Unknown error");  }}#endif value dynlib_dlopen(value libname, value flagval) /* ML */{  void *handle; #if defined(macintosh)   #pragma unused(flagval)  #if __POWERPC__  #define archType kPowerPCCFragArch  #else  #define archType kMotorola68KCFragArch  #endif  unsigned int len = string_length( libname );  unsigned char libName[64];  Ptr mainAddr;  Str255 errMessage;  OSErr err;  buf_to_p( len > 63 ? 63 : len, String_val( libname ), libName );  err = GetSharedLibrary( libName, archType, kReferenceCFrag,                          &(CFragConnectionID )handle, &mainAddr, errMessage );  if( err != noErr )  {    p_to_c( errMessage, (char *)errMessage );    failwith( (char *)errMessage );  }  #elif defined(WIN32)   handle = LoadLibrary( String_val(libname) );  if (!handle)  {    char MsgBuf[512];     FormatMessage(      FORMAT_MESSAGE_FROM_SYSTEM, NULL,      GetLastError(),      MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), /* Default language */      (LPTSTR) MsgBuf, 512, NULL );     failwith(MsgBuf);  } #elif defined(hpux)   {    int mlflags = Long_val(flagval);    int cflags;    handle = (void*)(malloc(sizeof(shl_t)));    if (1 & mlflags)       cflags = BIND_IMMEDIATE;    else      cflags = BIND_DEFERRED;    *((shl_t*)handle) = shl_load(String_val(libname), cflags, 0L);    if (!handle)       hpux_error();  } #else   int mlflags = Long_val(flagval);  int cflags;  if (1 & mlflags)     cflags = RTLD_NOW;  else    cflags = RTLD_LAZY;#ifndef __osf__       if (2 & mlflags)    cflags += RTLD_GLOBAL;#endif   handle = dlopen (String_val(libname), cflags);  if (!handle) {    failwith(dlerror());  } #endif   /* Since handle is a void pointer, we can just cast it to value */  return (value) handle;} value dynlib_dlclose(value handle) /* ML */{#if defined(macintosh)  CloseConnection( (CFragConnectionID *)&handle );#elif defined(WIN32)  FreeLibrary( (HMODULE) &handle);#elif defined(hpux)  shl_unload((shl_t) *((shl_t*)handle));#else  dlclose((void *) handle);#endif  return Val_unit;} value dynlib_dlsym(value handle, value sym) /* ML */{  void *symhdl; #if defined(macintosh)   Str255 symName;  unsigned int len = string_length( sym );  OSErr err;  CFragSymbolClass symClass;  buf_to_p( len, String_val( sym ), symName );  err = FindSymbol( (CFragConnectionID )handle, symName, &symhdl, &symClass );  switch( err )  {    case noErr:      break;    case cfragConnectionIDErr:      failwith( "FindSymbol: The connection ID was not valid." );      break;    case cfragNoSymbolErr:      failwith( "FindSymbol: The specified symbol was not found." );      break;    default:      failwith( "FindSymbol: unknown error" );      break;  }  #elif defined(WIN32)   symhdl = GetProcAddress((HMODULE) handle, String_val(sym));  if( !symhdl )  {    char MsgBuf[512];     FormatMessage(      FORMAT_MESSAGE_FROM_SYSTEM, NULL,      GetLastError(),      MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), /* Default language */      (LPTSTR) MsgBuf, 512, NULL );     failwith(MsgBuf);  } #elif defined(hpux)   {    shl_t myhandle = *((shl_t*)handle);    int res = shl_findsym(&myhandle, String_val(sym), TYPE_UNDEFINED, &symhdl);    if (res != 0)      hpux_error();  } #else   symhdl = dlsym((void *) handle, String_val(sym));  {       char *error = dlerror();    if (error != NULL)        failwith(error);  } #endif   return (value) symhdl;}