169 lines
3.6 KiB
C
169 lines
3.6 KiB
C
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: load_dl.c *
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* comments: dl based dynamic loaderr of external routines *
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* tested on i486-linuxelf *
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*************************************************************************/
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#include "Yap.h"
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#include "Yatom.h"
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#include "YapHeap.h"
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#include "yapio.h"
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#include "Foreign.h"
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#if LOAD_DL
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#include <dlfcn.h>
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#include <string.h>
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#include <stdio.h>
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/*
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* YAP_FindExecutable(argv[0]) should be called on yap initialization to
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* locate the executable of Yap
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*/
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void
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Yap_FindExecutable(char *name)
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{
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}
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/*
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* LoadForeign(ofiles,libs,proc_name,init_proc) dynamically loads foreign
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* code files and libraries and locates an initialization routine
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*/
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static Int
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LoadForeign(StringList ofiles, StringList libs,
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char *proc_name, YapInitProc *init_proc)
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{
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while (libs) {
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if (!Yap_TrueFileName(libs->s, Yap_FileNameBuf, TRUE)) {
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/* use LD_LIBRARY_PATH */
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strncpy(Yap_FileNameBuf, libs->s, YAP_FILENAME_MAX);
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}
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#ifdef __osf__
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if((libs->handle=dlopen(Yap_FileNameBuf,RTLD_LAZY)) == NULL)
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#else
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if((libs->handle=dlopen(Yap_FileNameBuf,RTLD_LAZY|RTLD_GLOBAL)) == NULL)
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#endif
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{
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strcpy(Yap_ErrorSay,dlerror());
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fprintf(stderr,"f=%s\n",Yap_ErrorSay);
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return LOAD_FAILLED;
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}
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libs = libs->next;
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}
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while (ofiles) {
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void *handle;
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/* load libraries first so that their symbols are available to
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other routines */
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/* dlopen wants to follow the LD_CONFIG_PATH */
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if (!Yap_TrueFileName(ofiles->s, Yap_FileNameBuf, TRUE)) {
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strcpy(Yap_ErrorSay, "%% Trying to open unexisting file in LoadForeign");
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return LOAD_FAILLED;
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}
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#ifdef __osf__
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if((handle=dlopen(Yap_FileNameBuf,RTLD_LAZY)) == 0)
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#else
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if((handle=dlopen(Yap_FileNameBuf,RTLD_LAZY|RTLD_GLOBAL)) == 0)
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#endif
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{
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fprintf(stderr,"dlopen of %s failed with error %s\n", Yap_FileNameBuf, dlerror());
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/* strcpy(Yap_ErrorSay,dlerror());*/
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return LOAD_FAILLED;
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}
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ofiles->handle = handle;
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if (!*init_proc)
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*init_proc = (YapInitProc) dlsym(handle,proc_name);
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ofiles = ofiles->next;
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}
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if(! *init_proc) {
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strcpy(Yap_ErrorSay,"Could not locate initialization routine");
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return LOAD_FAILLED;
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}
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return LOAD_SUCCEEDED;
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}
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Int
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Yap_LoadForeign(StringList ofiles, StringList libs,
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char *proc_name, YapInitProc *init_proc)
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{
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return LoadForeign(ofiles, libs, proc_name, init_proc);
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}
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void
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Yap_ShutdownLoadForeign(void)
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{
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ForeignObj *f_code;
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f_code = ForeignCodeLoaded;
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while (f_code != NULL) {
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StringList objs, libs;
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objs = f_code->objs;
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while (objs != NULL) {
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if (dlclose(objs->handle) != 0)
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return; /* ERROR */
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objs = objs->next;
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}
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libs = f_code->libs;
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while (libs != NULL) {
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if (dlclose(libs->handle) != 0)
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return; /* ERROR */
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objs = libs->next;
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}
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f_code = f_code->next;
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}
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/*
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make sure that we don't try to close foreign code several times, eg,
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from within an error handler
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*/
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ForeignCodeLoaded = NULL;
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}
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Int
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Yap_ReLoadForeign(StringList ofiles, StringList libs,
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char *proc_name, YapInitProc *init_proc)
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{
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return(LoadForeign(ofiles,libs, proc_name, init_proc));
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}
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#endif
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#if SIMICS
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void dlopen(void)
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{
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}
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void dlclose(void)
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{
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}
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void dlsym(void)
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{
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}
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#endif
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