lists, a really bad hash table, the last vestiges of the other backends, and some miscellaneous cleanups. Good for dropping 300k from the size of the built server on x86.
179 lines
4.4 KiB
C
179 lines
4.4 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* Once upon a time, X had multiple loader backends, three of which were
|
|
* essentially libdl reimplementations. This was nonsense so we chucked
|
|
* it, but we still retain the factorization between loader API and
|
|
* platform implementation. This file is the libdl implementation, and
|
|
* currently the only backend. If you find yourself porting to a platform
|
|
* without working libdl - hpux, win32, some forsaken a.out host, etc. -
|
|
* make a new backend rather than hacking up this file.
|
|
*/
|
|
|
|
#ifdef HAVE_XORG_CONFIG_H
|
|
#include <xorg-config.h>
|
|
#endif
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <dlfcn.h>
|
|
|
|
#include <X11/Xos.h>
|
|
#include "os.h"
|
|
|
|
#include "loader.h"
|
|
#include "dlloader.h"
|
|
|
|
#if defined(DL_LAZY)
|
|
#define DLOPEN_LAZY DL_LAZY
|
|
#elif defined(RTLD_LAZY)
|
|
#define DLOPEN_LAZY RTLD_LAZY
|
|
#elif defined(__FreeBSD__)
|
|
#define DLOPEN_LAZY 1
|
|
#else
|
|
#define DLOPEN_LAZY 0
|
|
#endif
|
|
|
|
#if defined(LD_GLOBAL)
|
|
#define DLOPEN_GLOBAL LD_GLOBAL
|
|
#elif defined(RTLD_GLOBAL)
|
|
#define DLOPEN_GLOBAL RTLD_GLOBAL
|
|
#else
|
|
#define DLOPEN_GLOBAL 0
|
|
#endif
|
|
|
|
#if defined(CSRG_BASED) && !defined(__ELF__)
|
|
#define DLSYM_PREFIX "_"
|
|
#else
|
|
#define DLSYM_PREFIX ""
|
|
#endif
|
|
|
|
typedef struct {
|
|
int handle;
|
|
void *dlhandle;
|
|
int flags;
|
|
} DLModuleRec, *DLModulePtr;
|
|
|
|
/* Hooray, yet another open coded linked list! FIXME */
|
|
typedef struct DLModuleList {
|
|
DLModulePtr module;
|
|
struct DLModuleList *next;
|
|
} DLModuleList;
|
|
|
|
static DLModuleList *dlModuleList = NULL;
|
|
|
|
static void *
|
|
DLFindSymbolLocal(pointer module, const char *name)
|
|
{
|
|
DLModulePtr dlfile = module;
|
|
void *p;
|
|
char *n;
|
|
|
|
static const char symPrefix[] = DLSYM_PREFIX;
|
|
|
|
n = malloc(strlen(symPrefix) + strlen(name) + 1);
|
|
if (strlen(symPrefix))
|
|
sprintf(n, "%s%s", symPrefix, name);
|
|
else
|
|
sprintf(n, "%s", name);
|
|
p = dlsym(dlfile->dlhandle, n);
|
|
free(n);
|
|
|
|
return p;
|
|
}
|
|
|
|
void *
|
|
DLFindSymbol(const char *name)
|
|
{
|
|
DLModuleList *l;
|
|
void *p;
|
|
|
|
for (l = dlModuleList; l != NULL; l = l->next) {
|
|
p = DLFindSymbolLocal(l->module, name);
|
|
if (p)
|
|
return p;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void *
|
|
DLLoadModule(loaderPtr modrec, int fd, int flags)
|
|
{
|
|
DLModulePtr dlfile;
|
|
DLModuleList *l;
|
|
int dlopen_flags;
|
|
|
|
if ((dlfile = calloc(1, sizeof(DLModuleRec))) == NULL) {
|
|
ErrorF("Unable to allocate DLModuleRec\n");
|
|
return NULL;
|
|
}
|
|
dlfile->handle = modrec->handle;
|
|
if (flags & LD_FLAG_GLOBAL)
|
|
dlopen_flags = DLOPEN_LAZY | DLOPEN_GLOBAL;
|
|
else
|
|
dlopen_flags = DLOPEN_LAZY;
|
|
dlfile->dlhandle = dlopen(modrec->name, dlopen_flags);
|
|
if (dlfile->dlhandle == NULL) {
|
|
ErrorF("dlopen: %s\n", dlerror());
|
|
free(dlfile);
|
|
return NULL;
|
|
}
|
|
|
|
l = malloc(sizeof(DLModuleList));
|
|
l->module = dlfile;
|
|
l->next = dlModuleList;
|
|
dlModuleList = l;
|
|
|
|
return (void *)dlfile;
|
|
}
|
|
|
|
void
|
|
DLUnloadModule(void *modptr)
|
|
{
|
|
DLModulePtr dlfile = (DLModulePtr) modptr;
|
|
DLModuleList *l, *p;
|
|
|
|
/* remove it from dlModuleList. */
|
|
if (dlModuleList->module == modptr) {
|
|
l = dlModuleList;
|
|
dlModuleList = l->next;
|
|
free(l);
|
|
} else {
|
|
p = dlModuleList;
|
|
for (l = dlModuleList->next; l != NULL; l = l->next) {
|
|
if (l->module == modptr) {
|
|
p->next = l->next;
|
|
free(l);
|
|
break;
|
|
}
|
|
p = l;
|
|
}
|
|
}
|
|
dlclose(dlfile->dlhandle);
|
|
free(modptr);
|
|
}
|