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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 "YapHeap.h"
#include "yapio.h"
#include "Foreign.h"
#if LOAD_DL
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// use SWI-Prolog code if all else fails
char *
findExecutable(const char *av0, char *buffer);
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#include <stdlib.h>
#include <dlfcn.h>
#include <string.h>
#include <stdio.h>
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#if defined(__APPLE__)
#include <mach-o/dyld.h>
#endif
typedef void (*prismf)(void);
/* only works for dlls */
int
Yap_CallFunctionByName(const char *thing_string);
int
Yap_CallFunctionByName(const char *thing_string)
{
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void * handle = dlopen(NULL, RTLD_LAZY
#ifndef __CYGWIN__
#ifdef RTLD_NOLOAD
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| RTLD_NOLOAD
#endif
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#endif
);
// you could do RTLD_NOW as well. shouldn't matter
if (!handle) {
CACHE_REGS
Yap_Error(SYSTEM_ERROR, ARG1, "Dynamic linking on main module : %s\n", dlerror());
}
prismf * addr = (prismf *)dlsym(handle, thing_string);
if (addr)
(*addr)();
dlclose(handle);
return TRUE;
}
/*
* YAP_FindExecutable(argv[0]) should be called on yap initialization to
* locate the executable of Yap
*/
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char *
Yap_FindExecutable(void)
{
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#if HAVE_GETEXECNAME
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// Solaris
return getexecname();
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#elif __APPLE__
char path[1024];
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char *buf;
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uint32_t size = sizeof(path);
if (!_NSGetExecutablePath(path, &size)) {
size_t sz = strlen(path);
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buf = malloc(sz+1);
strncpy(buf, path, sz);
return buf;
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} else {
char *rc = malloc(size+1);
if (_NSGetExecutablePath(rc, &size) == 0)
return "yap";
return rc;
}
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#elif defined(__linux__)
enum { BUFFERSIZE = 1024 };
char *buf = malloc(BUFFERSIZE);
ssize_t len = readlink("/proc/self/exe", buf, sizeof(buf)-1);
if (len != -1) {
buf[len] = '\0';
return buf;
}
// follow through to standard method
#elif defined(__FreeBSD__) || defined(__DragonFly__)
enum { BUFFERSIZE = 1024 };
char *buf = malloc(BUFFERSIZE);
ssize_t len = readlink("/proc/curproc/file", buf, sizeof(buf)-1);
if (len != -1) {
buf[len] = '\0';
return buf;
}
int mib[4];
mib[0] = CTL_KERN;
mib[1] = KERN_PROC;
mib[2] = KERN_PROC_PATHNAME;
mib[3] = -1; // current process
size_t cb = BUFFERSIZE;
sysctl(mib, 4, buf, &cb, NULL, 0);
// follow through to standard method
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#endif
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return
findExecutable(GLOBAL_argv[0], buf);
}
void *
Yap_LoadForeignFile(char *file, int flags)
{
int dlflag;
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void *out;
if (flags & EAGER_LOADING)
dlflag = RTLD_NOW;
else
dlflag = RTLD_LAZY;
if (flags & GLOBAL_LOADING)
dlflag |= RTLD_GLOBAL;
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#ifndef __CYGWIN__
else
dlflag |= RTLD_LOCAL;
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#endif
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out = (void *)dlopen(file,dlflag);
if (!out) {
CACHE_REGS
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Yap_Error(SYSTEM_ERROR, ARG1, "dlopen error for %s: %s\n", file, dlerror());
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}
return out;
}
int
Yap_CallForeignFile(void *handle, char *f)
{
YapInitProc proc = (YapInitProc) dlsym(handle, f);
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if (!proc) {
/* Yap_Error(SYSTEM_ERROR, ARG1, "dlsym error %s\n", dlerror());*/
return FALSE;
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}
(*proc) ();
return TRUE;
}
int
Yap_CloseForeignFile(void *handle)
{
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if ( dlclose(handle) < 0) {
CACHE_REGS
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Yap_Error(SYSTEM_ERROR, ARG1, "dlclose error %s\n", dlerror());
return -1;
}
return 0;
}
/*
* LoadForeign(ofiles,libs,proc_name,init_proc) dynamically loads foreign
* code files and libraries and locates an initialization routine
*/
static Int
LoadForeign(StringList ofiles, StringList libs,
char *proc_name, YapInitProc *init_proc)
{
CACHE_REGS
while (libs) {
if (!Yap_TrueFileName(AtomName(libs->name), LOCAL_FileNameBuf, TRUE)) {
/* use LD_LIBRARY_PATH */
strncpy(LOCAL_FileNameBuf, AtomName(libs->name), YAP_FILENAME_MAX);
}
#ifdef __osf__
if((libs->handle=dlopen(LOCAL_FileNameBuf,RTLD_LAZY)) == NULL)
#else
if((libs->handle=dlopen(LOCAL_FileNameBuf,RTLD_LAZY|RTLD_GLOBAL)) == NULL)
#endif
{
strcpy(LOCAL_ErrorSay,dlerror());
return LOAD_FAILLED;
}
libs = libs->next;
}
while (ofiles) {
void *handle;
/* load libraries first so that their symbols are available to
other routines */
/* dlopen wants to follow the LD_CONFIG_PATH */
if (!Yap_TrueFileName(AtomName(ofiles->name), LOCAL_FileNameBuf, TRUE)) {
strcpy(LOCAL_ErrorSay, "%% Trying to open unexisting file in LoadForeign");
return LOAD_FAILLED;
}
#ifdef __osf__
if((handle=dlopen(LOCAL_FileNameBuf,RTLD_LAZY)) == 0)
#else
if((handle=dlopen(LOCAL_FileNameBuf,RTLD_LAZY|RTLD_GLOBAL)) == 0)
#endif
{
fprintf(stderr,"dlopen of %s failed with error %s\n", LOCAL_FileNameBuf, dlerror());
/* strcpy(LOCAL_ErrorSay,dlerror());*/
return LOAD_FAILLED;
}
ofiles->handle = handle;
if (proc_name && !*init_proc)
*init_proc = (YapInitProc) dlsym(handle,proc_name);
ofiles = ofiles->next;
}
if(! *init_proc) {
strcpy(LOCAL_ErrorSay,"Could not locate initialization routine");
return LOAD_FAILLED;
}
return LOAD_SUCCEEDED;
}
Int
Yap_LoadForeign(StringList ofiles, StringList libs,
char *proc_name, YapInitProc *init_proc)
{
return LoadForeign(ofiles, libs, proc_name, init_proc);
}
void
Yap_ShutdownLoadForeign(void)
{
ForeignObj *f_code;
f_code = ForeignCodeLoaded;
while (f_code != NULL) {
StringList objs, libs, old;
ForeignObj *of_code = f_code;
objs = f_code->objs;
while (objs != NULL) {
old = objs;
if (dlclose(objs->handle) != 0)
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return; /* ERROR */
objs = objs->next;
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Yap_FreeCodeSpace((ADDR)old);
}
libs = f_code->libs;
while (libs != NULL) {
old = libs;
if (dlclose(libs->handle) != 0)
return; /* ERROR */
libs = libs->next;
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Yap_FreeCodeSpace((ADDR)old);
}
f_code = f_code->next;
Yap_FreeCodeSpace((ADDR)of_code);
}
/*
make sure that we don't try to close foreign code several times, eg,
from within an error handler
*/
ForeignCodeLoaded = NULL;
}
Int
Yap_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