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/* --------------------------------------------------------------------------
* Dynamic loading (of .dll or .so files) for Hugs
*
* The Hugs 98 system is Copyright (c) Mark P Jones, Alastair Reid, the
* Yale Haskell Group, and the Oregon Graduate Institute of Science and
* Technology, 1994-1999, All rights reserved. It is distributed as
* free software under the license in the file "License", which is
* included in the distribution.
*
* $RCSfile: dynamic.c,v $
* $Revision: 1.13 $
* $Date: 1999/11/25 10:19:15 $
* ------------------------------------------------------------------------*/
#include "prelude.h"
#include "storage.h"
#include "errors.h"
#include "dynamic.h"
#include "connect.h"
#if HAVE_WINDOWS_H && !defined(__MSDOS__)
#include <windows.h>
void* getDLLSymbol(line,dll0,symbol0) /* load dll and lookup symbol */
Int line;
String dll0;
String symbol0; {
void* sym;
char dll[1000];
char symbol[100];
ObjectFile instance;
if (strlen(dll0) > 996-strlen(installDir)) {
ERRMSG(line) "Excessively long library name:\n%s\n",dll0
EEND;
}
dll[0] = 0;
if (strcmp("nHandle",dll0)==0) strcat(dll,installDir);
strcat(dll,dll0);
strcat(dll, ".dll");
if (strlen(symbol0) > 96) {
ERRMSG(line) "Excessively long symbol name:\n%s\n",symbol0
EEND;
}
strcpy(&(symbol[1]),symbol0);
symbol[0] = '_';
instance = LoadLibrary(dll);
if (NULL == instance) {
/* GetLastError allegedly provides more detail - in practice,
* it tells you nothing more.
*/
ERRMSG(line) "Can't open library \"%s\"", dll
EEND;
}
sym = GetProcAddress(instance,symbol0);
return sym;
}
Bool stdcallAllowed ( void )
{
return TRUE;
}
#elif HAVE_DLFCN_H /* eg LINUX, SOLARIS, ULTRIX */
#include <stdio.h>
#include <dlfcn.h>
void* getDLLSymbol(line,dll0,symbol) /* load dll and lookup symbol */
Int line;
String dll0;
String symbol; {
void* sym;
char dll[1000];
ObjectFile instance;
if (strlen(dll0) > 996-strlen(installDir)) {
ERRMSG(line) "Excessively long library name:\n%s\n",dll0
EEND;
}
dll[0] = 0;
if (strcmp("nHandle",dll0)==0) strcat(dll,installDir);
strcat(dll,dll0);
strcat(dll, ".so");
#ifdef RTLD_NOW
instance = dlopen(dll,RTLD_NOW);
#elif defined RTLD_LAZY /* eg SunOS4 doesn't have RTLD_NOW */
instance = dlopen(dll,RTLD_LAZY);
#else /* eg FreeBSD doesn't have RTLD_LAZY */
instance = dlopen(dll,1);
#endif
if (NULL == instance) {
ERRMSG(line) "Can't open library \"%s\":\n %s\n",dll,dlerror()
EEND;
}
if ((sym = dlsym(instance,symbol)))
return sym;
ERRMSG(line) "Can't find symbol \"%s\" in library \"%s\"",symbol,dll
EEND;
}
Bool stdcallAllowed ( void )
{
return FALSE;
}
#elif HAVE_DL_H /* eg HPUX */
#include <dl.h>
void* getDLLSymbol(line,dll0,symbol) /* load dll and lookup symbol */
Int line;
String dll0;
String symbol; {
ObjectFile instance = shl_load(dll,BIND_IMMEDIATE,0L);
void* r;
if (NULL == instance) {
ERRMSG(line) "Error while importing DLL \"%s\"", dll0
EEND;
}
return (0 == shl_findsym(&instance,symbol,TYPE_PROCEDURE,&r)) ? r : 0;
}
Bool stdcallAllowed ( void )
{
return FALSE;
}
#else /* Dynamic loading not available */
void* getDLLSymbol(line,dll0,symbol) /* load dll and lookup symbol */
Int line;
String dll0;
String symbol; {
#if 1 /* very little to choose between these options */
return 0;
#else
ERRMSG(line) "This Hugs build does not support dynamic loading\n"
EEND;
#endif
}
Bool stdcallAllowed ( void )
{
return FALSE;
}
#endif /* Dynamic loading not available */
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