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yap-6.3/C/load_dl.c

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/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: load_dl.c *
* comments: dl based dynamic loaderr of external routines *
* tested on i486-linuxelf *
*************************************************************************/
#include "Yap.h"
#include "Yatom.h"
#include "Heap.h"
#include "yapio.h"
#include "Foreign.h"
#if LOAD_DL
#include <dlfcn.h>
#include <string.h>
#include <stdio.h>
/*
* YAPFindExecutable(argv[0]) should be called on yap initialization to
* locate the executable of Yap
*/
void
YAPFindExecutable(char *name)
{
/* not really needed for dl version */
strcpy(YapExecutable,"yap");
}
/*
* LoadForeign(ofiles,libs,proc_name,init_proc) dynamically loads foreign
* code files and libraries and locates an initialization routine
*/
Int
LoadForeign(StringList ofiles, StringList libs,
char *proc_name, YapInitProc *init_proc)
{
while (ofiles) {
void *handle;
/* dlopen wants to follow the LD_CONFIG_PATH */
if (!TrueFileName(ofiles->s, FileNameBuf, TRUE)) {
strcpy(LoadMsg, "[ Trying to open unexisting file in LoadForeign ]");
return LOAD_FAILLED;
}
#ifdef __osf__
if((handle=dlopen(FileNameBuf,RTLD_LAZY)) == 0)
#else
if((handle=dlopen(FileNameBuf,RTLD_LAZY|RTLD_GLOBAL)) == 0)
#endif
{
fprintf(stderr,"calling dlopen with error %s\n", dlerror());
/* strcpy(LoadMsg,dlerror());*/
return LOAD_FAILLED;
}
ofiles->handle = handle;
if (!*init_proc)
*init_proc = (YapInitProc) dlsym(handle,proc_name);
ofiles = ofiles->next;
}
if(! *init_proc) {
strcpy(LoadMsg,"Could not locate initialization routine");
return LOAD_FAILLED;
}
/* load libraries first so that their symbols are available to
other routines */
while (libs) {
if (libs->s[0] == '-') {
strcpy(FileNameBuf,"lib");
strcat(FileNameBuf,libs->s+2);
strcat(FileNameBuf,".so");
} else {
strcpy(FileNameBuf,libs->s);
}
#ifdef __osf__
if((libs->handle=dlopen(FileNameBuf,RTLD_LAZY)) == NULL)
#else
if((libs->handle=dlopen(FileNameBuf,RTLD_LAZY|RTLD_GLOBAL)) == NULL)
#endif
{
strcpy(LoadMsg,dlerror());
return LOAD_FAILLED;
}
libs = libs->next;
}
return LOAD_SUCCEEDED;
}
void
ShutdownLoadForeign(void)
{
ForeignObj *f_code;
f_code = ForeignCodeLoaded;
while (f_code != NULL) {
StringList objs, libs;
objs = f_code->objs;
while (objs != NULL) {
if (dlclose(objs->handle) != 0)
return; /* ERROR */
objs = objs->next;
}
libs = f_code->libs;
while (libs != NULL) {
if (dlclose(libs->handle) != 0)
return; /* ERROR */
objs = libs->next;
}
f_code = f_code->next;
}
}
Int
ReLoadForeign(StringList ofiles, StringList libs,
char *proc_name, YapInitProc *init_proc)
{
return(LoadForeign(ofiles,libs, proc_name, init_proc));
}
#endif
#if SIMICS
void dlopen(void)
{
}
void dlclose(void)
{
}
void dlsym(void)
{
}
#endif