Hi
Having searched the documentation and faq and mailing list archives in
vain on how to add X extensions to VNC, I decided to download the source
code and try doing it myself.
I wanted to be able to have Xvnc load user defined extensions without
having to recompile it each time.
Here is what i did to achieve this - some of you might find it useful.
Let me warn you that this is simply a quick & dirty hack and that I have
tried this only on solaris.
I used vnc-3.3.3r2 src code for Unix -
1. I modified src/Xvnc/programs/Xserver/mi/miinitext.c to read a file
specified from the command line as "vncserver .... -x
<extension-list-file>". The file contains a list of .so's to be loaded
and a init-function to call in each .so
Then i parse this file and "dlopen" each .so and call the specified
initfunc from that .so
I am attaching the modified miinitext.c as well as a sample
extension-list-file.
2. Modify src/Xvnc/programs/Xserver/Makefile to add "-ldl"
EXTRA_LIBRARIES
and rebuild the VNC tree
3. Run the rebuilt VNC as follows
vncserver <options...> -x extension-list-file
that's it... atleast the the X server extension that I was working on
for my project loaded beautifully without any changes...
I am wondering if the distributed Xvnc could not be modified to do
something similar (I am not an X extension expert & so I am not sure if
I missed anything). This way users could add their own X extensions to
VNC without having to recompile it.
This might not work all the time (for eg. the SUN GLX extension cannot
be added because it uses some sun private stuff in the X server - i
think...) - but will atleast work in most straightforward cases.
-krishna
--
===================================================================
Krishna Gadepalli Sun Microsystems, Inc.
650.786.6343 (voice) Imaging & Video Group
650.786.5852 (fax) 901 San Antonio Road
MS UMPK27-301
[EMAIL PROTECTED] Palo Alto, CA 94303
===================================================================
Those are my principles. "Qvid me anxivs svm?"
If you dont like them, I have others ,,,
- Groucho Marx (o o)
--------------------------------------------------ooO-(_)-Ooo------
/***********************************************************
Copyright (c) 1987 X Consortium
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
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in this Software without prior written authorization from the X Consortium.
Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
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Permission to use, copy, modify, and distribute this software and its
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******************************************************************/
/* $XConsortium: miinitext.c /main/41 1996/09/28 17:15:08 rws $ */
/* $XFree86: xc/programs/Xserver/mi/miinitext.c,v 3.17.2.3 1997/05/22 14:00:46 dawes
Exp $ */
#include "misc.h"
#include "extension.h"
#ifdef NOPEXEXT /* sleaze for Solaris cpp building XsunMono */
#undef PEXEXT
#endif
extern Bool noTestExtensions;
#ifdef XKB
extern Bool noXkbExtension;
#endif
#if NeedFunctionPrototypes
#define INITARGS void
#else
#define INITARGS /*nothing*/
#endif
typedef void (*InitExtension)(INITARGS);
/* FIXME: this whole block of externs should be from the appropriate headers */
#ifdef BEZIER
extern void BezierExtensionInit(INITARGS);
#endif
#ifdef XTESTEXT1
extern void XTestExtension1Init(INITARGS);
#endif
#ifdef SHAPE
extern void ShapeExtensionInit(INITARGS);
#endif
#ifdef MITSHM
extern void ShmExtensionInit(INITARGS);
#endif
#ifdef PEXEXT
#ifndef PEX_MODULE
extern void PexExtensionInit(INITARGS);
#endif
InitExtension PexExtensionInitPtr = NULL;
#endif
#ifdef MULTIBUFFER
extern void MultibufferExtensionInit(INITARGS);
#endif
#ifdef XINPUT
extern void XInputExtensionInit(INITARGS);
#endif
#ifdef XTEST
extern void XTestExtensionInit(INITARGS);
#endif
#ifdef BIGREQS
extern void BigReqExtensionInit(INITARGS);
#endif
#ifdef MITMISC
extern void MITMiscExtensionInit(INITARGS);
#endif
#ifdef XIDLE
extern void XIdleExtensionInit(INITARGS);
#endif
#ifdef XTRAP
extern void DEC_XTRAPInit(INITARGS);
#endif
#ifdef SCREENSAVER
extern void ScreenSaverExtensionInit (INITARGS);
#endif
#ifdef XV
extern void XvExtensionInit(INITARGS);
#endif
#ifdef XIE
#ifndef XIE_MODULE
extern void XieInit(INITARGS);
#endif
InitExtension XieInitPtr = NULL;
#endif
#ifdef XSYNC
extern void SyncExtensionInit(INITARGS);
#endif
#ifdef XKB
extern void XkbExtensionInit(INITARGS);
#endif
#ifdef XCMISC
extern void XCMiscExtensionInit(INITARGS);
#endif
#ifdef XRECORD
extern void RecordExtensionInit(INITARGS);
#endif
#ifdef LBX
extern void LbxExtensionInit(INITARGS);
#endif
#ifdef DBE
extern void DbeExtensionInit(INITARGS);
#endif
#ifdef XAPPGROUP
extern void XagExtensionInit(INITARGS);
#endif
#ifdef XCSECURITY
extern void SecurityExtensionInit(INITARGS);
#endif
#ifdef XPRINT
extern void XpExtensionInit(INITARGS);
#endif
#ifdef XF86VIDMODE
extern void XFree86VidModeExtensionInit(INITARGS);
#endif
#ifdef XF86MISC
extern void XFree86MiscExtensionInit(INITARGS);
#endif
#ifdef XFreeXDGA
extern void XFree86DGAExtensionInit(INITARGS);
#endif
#ifdef DPMSExtension
extern void DPMSExtensionInit(INITARGS);
#endif
#ifdef GLXEXT
#ifndef GLX_MODULE
extern void GlxExtensionInit(INITARGS);
#else
InitExtension GlxExtensionInitPtr = NULL;
#endif
#endif
#include <dlfcn.h>
#include <stdio.h>
#include <string.h>
int parse_string(char *inp, char fields[2][256], int maxtokens)
{
int ntokens = 0;
int length;
char *beg, *end;
if ((inp == NULL) || (fields == NULL))
return 0;
beg = end = inp;
while ((*beg != '\0') && (ntokens < maxtokens)) {
beg = end; while (*beg && isspace(*beg)) beg++;
if (*beg == '#')
return 0;
end = beg; while (*end && !isspace(*end)) end++;
if ((length = end - beg) > 0) {
strncpy(fields[ntokens], beg, length);
fields[ntokens][length] = '\0';
ntokens++;
}
}
return ntokens;
}
void LoadUserExtensions(argc, argv)
int argc;
char *argv[];
{
FILE *extfp;
char *extfile, *lptr;
char linebuf[512], fields[2][256];
int n;
void *dlhandle;
void (*initptr)();
char *dlerrstr;
for (n = 1; n < argc; n++) {
if (strcmp(argv[n], "-x"))
continue;
else
break;
}
if (n >= argc-1)
return;
else
extfile = argv[++n];
AuditF("Loading extensions from list file [%s]\n", extfile);
if ((extfp = fopen(extfile, "r")) == NULL) {
AuditF("ERROR! could not open list file for reading\n");
return;
}
while (fgets(linebuf, sizeof(linebuf)-1, extfp) != NULL) {
int mode = RTLD_GLOBAL;
if ((n = parse_string(linebuf, fields, 3)) < 2)
continue;
if ((n > 2) && !strcasecmp(fields[2], "yes"))
mode |= RTLD_NOW;
else
mode |= RTLD_LAZY;
if ((dlhandle = dlopen(fields[0], RTLD_LAZY|RTLD_GLOBAL)) == NULL) {
dlerrstr = dlerror();
dlerrstr = dlerrstr ? dlerrstr : "--";
AuditF("ERROR! could not load ext {%s} / [%s]\n",
fields[0], dlerrstr);
continue;
}
if ((initptr = dlsym(dlhandle, fields[1])) == NULL) {
dlerrstr = dlerror();
dlerrstr = dlerrstr ? dlerrstr : "--";
AuditF("ERROR! could not find init func (%s) in ext {%s} / [%s]\n",
fields[1], fields[0], dlerrstr);
continue;
}
AuditF("Calling init func (%s) from %s-loaded ext {%s}\n",
fields[1], (mode & RTLD_LAZY) ? "lazy" : "pre", fields[0]);
(*initptr)();
}
}
/*ARGSUSED*/
void
InitExtensions(argc, argv)
int argc;
char *argv[];
{
#ifdef BEZIER
BezierExtensionInit();
#endif
#ifdef XTESTEXT1
if (!noTestExtensions) XTestExtension1Init();
#endif
#ifdef SHAPE
ShapeExtensionInit();
#endif
#ifdef MITSHM
ShmExtensionInit();
#endif
#ifdef PEXEXT
#ifndef PEX_MODULE
PexExtensionInit();
#else
if (PexExtensionInitPtr != NULL) {
(*PexExtensionInitPtr)();
}
#endif
#endif
#ifdef MULTIBUFFER
MultibufferExtensionInit();
#endif
#ifdef XINPUT
XInputExtensionInit();
#endif
#ifdef XTEST
if (!noTestExtensions) XTestExtensionInit();
#endif
#ifdef BIGREQS
BigReqExtensionInit();
#endif
#ifdef MITMISC
MITMiscExtensionInit();
#endif
#ifdef XIDLE
XIdleExtensionInit();
#endif
#ifdef XTRAP
if (!noTestExtensions) DEC_XTRAPInit();
#endif
#ifdef SCREENSAVER
ScreenSaverExtensionInit ();
#endif
#ifdef XV
XvExtensionInit();
#endif
#ifdef XIE
#ifndef XIE_MODULE
XieInit();
#else
if (XieInitPtr != NULL) {
(*XieInitPtr)();
}
#endif
#endif
#ifdef XSYNC
SyncExtensionInit();
#endif
#ifdef XKB
if (!noXkbExtension) XkbExtensionInit();
#endif
#ifdef XCMISC
XCMiscExtensionInit();
#endif
#ifdef XRECORD
if (!noTestExtensions) RecordExtensionInit();
#endif
#ifdef LBX
LbxExtensionInit();
#endif
#ifdef DBE
DbeExtensionInit();
#endif
#ifdef XAPPGROUP
XagExtensionInit();
#endif
#ifdef XCSECURITY
SecurityExtensionInit();
#endif
#ifdef XPRINT
XpExtensionInit();
#endif
#if defined(XF86VIDMODE) && !defined(PRINT_ONLY_SERVER)
XFree86VidModeExtensionInit();
#endif
#if defined(XF86MISC) && !defined(PRINT_ONLY_SERVER)
XFree86MiscExtensionInit();
#endif
#if defined(XFreeXDGA) && !defined(PRINT_ONLY_SERVER)
XFree86DGAExtensionInit();
#endif
#if defined(DPMSExtension) && !defined(PRINT_ONLY_SERVER)
DPMSExtensionInit();
#endif
#ifdef GLXEXT
#ifndef GLX_MODULE
GlxExtensionInit();
#else
if (GlxExtensionInitPtr != NULL) {
(*GlxExtensionInitPtr)();
}
#endif
#endif
LoadUserExtensions(argc, argv);
}
#
# List of extensions to be loaded by Xvnc
#
# Format : <.so-name> <init-func-name> <preload = yes|no>
#
# - see "man dlopen" for specifying .so path name (the dynamic library to
# be loaded for the extension.
#
# - if preload is set to "yes" then RTLD_NOW is sent with the mode bits
# to 'dlopen' otherwise (if set to "no") RTLD_LAZY is sent with
# the 'mode" bits for 'dlopen'
#
MyXExtension.so __MyExtensionInit no
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