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/* $XFree86: xc/programs/Xserver/hw/xfree86/loader/dlloader.c,v 1.11 2000/08/23 22:10:14 tsi Exp $ */
/*
*
* Copyright (c) 1997 The XFree86 Project, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without
* fee, provided that the above copyright notice appear in all copies
* and that both that copyright notice and this permission notice
* appear in supporting documentation, and that the name of the
* XFree86 Project, Inc. not be used in advertising or publicity
* pertaining to distribution of the software without specific,
* written prior permission. The Xfree86 Project, Inc. makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied
* warranty.
*
* THE XFREE86 PROJECT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL THE XFREE86 PROJECT, INC. BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE. */
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
#include "Xos.h"
#include "os.h"
#include "sym.h"
#include "loader.h"
#include "dlloader.h"
#ifdef DL_LAZY
#define DLOPEN_LAZY DL_LAZY
#else
#ifdef RTLD_LAZY
#define DLOPEN_LAZY RTLD_LAZY
#else
#ifdef __FreeBSD__
#define DLOPEN_LAZY 1
#else
#define DLOPEN_LAZY 0
#endif
#endif
#endif
#ifdef LD_GLOBAL
#define DLOPEN_GLOBAL LD_GLOBAL
#else
#ifdef RTLD_GLOBAL
#define DLOPEN_GLOBAL RTLD_GLOBAL
#else
#define DLOPEN_GLOBAL 0
#endif
#endif
#define DLOPEN_FLAGS ( DLOPEN_LAZY | DLOPEN_GLOBAL )
#if defined(CSRG_BASED) && !defined(__ELF__)
#define NEED_UNDERSCORE_FOR_DLLSYM
#endif
/*
* This structure contains all of the information about a module
* that has been loaded.
*/
typedef struct {
int handle;
void *dlhandle;
} DLModuleRec, *DLModulePtr;
/*
* a list of loaded modules XXX can be improved
*/
typedef struct DLModuleList {
DLModulePtr module;
struct DLModuleList *next;
} DLModuleList;
DLModuleList *dlModuleList = NULL;
/*
* Search a symbol in the module list
*/
void *
DLFindSymbol(const char *name)
{
DLModuleList *l;
void *p;
#ifdef NEED_UNDERSCORE_FOR_DLLSYM
char *n;
n = xf86loadermalloc(strlen(name) + 2);
sprintf(n, "_%s", name);
#endif
(void)dlerror(); /* Clear out any previous error */
for (l = dlModuleList; l != NULL; l = l->next) {
#ifdef NEED_UNDERSCORE_FOR_DLLSYM
p = dlsym(l->module->dlhandle, n);
#else
p = dlsym(l->module->dlhandle, name);
#endif
if (dlerror() == NULL) {
#ifdef NEED_UNDERSCORE_FOR_DLLSYM
xf86loaderfree(n);
#endif
return p;
}
}
#ifdef NEED_UNDERSCORE_FOR_DLLSYM
xf86loaderfree(n);
#endif
return NULL;
}
/*
* public interface
*/
void *
DLLoadModule(loaderPtr modrec, int fd, LOOKUP **ppLookup)
{
DLModulePtr dlfile;
DLModuleList *l;
if ((dlfile=xf86loadercalloc(1,sizeof(DLModuleRec)))==NULL) {
ErrorF("Unable to allocate DLModuleRec\n");
return NULL;
}
dlfile->handle = modrec->handle;
dlfile->dlhandle = dlopen(modrec->name, DLOPEN_FLAGS);
if (dlfile->dlhandle == NULL) {
ErrorF("dlopen: %s\n", dlerror());
xf86loaderfree(dlfile);
return NULL;
}
/* Add it to the module list */
l = xf86loadermalloc(sizeof(DLModuleList));
l->module = dlfile;
l->next = dlModuleList;
dlModuleList = l;
*ppLookup = NULL;
return (void *)dlfile;
}
void
DLResolveSymbols(void *mod)
{
return;
}
int
DLCheckForUnresolved(void *mod)
{
return 0;
}
void
DLUnloadModule(void *modptr)
{
DLModulePtr dlfile = (DLModulePtr)modptr;
DLModuleList *l, *p;
/* remove it from dlModuleList */
if (dlModuleList->module == modptr) {
l = dlModuleList;
dlModuleList = l->next;
xf86loaderfree(l);
} else {
p = dlModuleList;
for (l = dlModuleList->next; l != NULL; l = l->next) {
if (l->module == modptr) {
p->next = l->next;
xf86loaderfree(l);
break;
}
p = l;
}
}
dlclose(dlfile->dlhandle);
xf86loaderfree(modptr);
}
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