libfbx-modules.c

libfxb是linux下只写操作framebuffer的一个轻量级的库。

/*
 *  libfbx-modules.c -- Module handling functions.
 *  (C)opyright 2001 U4X Labs
 *
 *  Written by: Paul Mundt <[e-mail]>
 *
 *  $Id: libfbx-modules.c,v 1.6 2001/02/11 07:12:51 lethal Exp $
 *
 *	This is where all of the module handling functions for
 *  libfbx are located.
 *
 *  See ChangeLog for modifications, CREDITS for credits.
 *
 *  All source herein is copyright U4X Labs and its original author. 
 *  Any code modifications or additions are (C)opyright the original 
 *  author and U4X Labs respectively.
 *
 *  libfbx is free software; you can redistribute it and/or modify it 
 *  under the terms of the GNU Lesser General Public License as 
 *  published by the Free Software Foundation; either version 2.1 of 
 *  the License, or (at your option) any later version.
 *
 *  libfbx is distributed in the hope that it will be useful, but 
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with libfbx; if not, write to the Free Software 
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 *  USA
 */
#include <libfbx/libfbx.h>
#include <libfbx/libfbx-drivers.h>
#include <unistd.h>
#include <dlfcn.h>
#include <config.h>

fb_module fb_modules[] = {
	{ "MATROX", "mga" },
	{ "3Dfx Voodoo3", "3dfx" },
	{ "3Dfx Banshee", "3dfx" },
	{ "ATY Mach64", "ati" },
	{ "ATY Rage128", "ati" },
	{ NULL, NULL },
};

/* 
 * Note: surface should be fb_screen for now.  It exists
 *       to provide for future expansion.
 */
int fb_load_module(char *name)
{
	fb_surface *surface = fb_screen;
	char modname[LEN], *errstr;

	if (name == NULL)
		return -1;

	snprintf(modname, sizeof(modname), "%s/libfbx-%s.so", MODULEDIR, name);

	if (access(modname, F_OK) < 0) {
		perror("Can't open module for reading");
		return -1;
	}

	surface->driver->handle = dlopen(modname, RTLD_LAZY);

	if (surface->driver->handle == NULL) {
		perror("Can't open module");
		return -1;
	}

	surface->driver->init = dlsym(surface->driver->handle, "fb_module_init");
	
	if ((errstr = dlerror()) != NULL) {
		fprintf(stderr, "%s\n", errstr);
		return -1;
	}
	
	surface->driver->exit = dlsym(surface->driver->handle, "fb_module_exit");

	if ((errstr = dlerror()) != NULL) {
		fprintf(stderr, "%s\n", errstr);
		return -1;
	}

	return 0;
}

void fb_unload_module()
{
	fb_surface *surface = fb_screen;
	dlclose(surface->driver->handle);
	surface->driver->handle = NULL;
}