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/* This is part of um-ViewOS
* The user-mode implementation of OSVIEW -- A Process with a View
*
* modutils.c: misc utilites for modules
*
* Copyright 2007 Ludovico Gardenghi University of Bologna - Italy
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* $Id: modutils.c 573 2008-06-18 10:41:29Z garden $
*
*/
#include <dlfcn.h>
#include <alloca.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <config.h>
#include "gdebug.h"
/* This will be prefixed with getent("$HOME") */
#define USER_MODULES_DIR "/.umview/modules"
#ifndef MAX
# define MAX(a, b) ((a) > (b) ? (a) : (b))
#endif
/*
* Try to dlopen a module (o submodule) trying different names and locations:
*
* 1) dlopen(modname)
* 2) dlopen(modname.so)
* 3) dlopen(user_umview_plugin_directory/modname)
* 4) dlopen(user_umview_plugin_directory/modname.so)
* 5) dlopen(global_umview_plugin_directory/modname)
* 6) dlopen(global_umview_plugin_directory/modname.so)
*
*/
#define TRY_DLOPEN(fmt...) \
{ \
snprintf(testpath, tplen, fmt); \
if ((handle = dlopen(testpath, flag))) \
{ \
free(testpath); \
return handle; \
} \
}
void *openmodule(const char *modname, int flag)
{
void *handle;
char *testpath;
int tplen;
char *homedir = getenv("HOME");
if (!modname)
return NULL;
if ((handle = dlopen(modname, flag)))
return handle;
/* If there is no home directory, use CWD */
if (!homedir)
homedir = ".";
tplen = strlen(modname) +
strlen(MODULES_EXT) + 2 + // + 1 is for a '/' and + 1 for \0
MAX(strlen(MODULES_DIR),
strlen(homedir) + strlen(USER_MODULES_DIR));
testpath = malloc(tplen);
TRY_DLOPEN("%s%s", modname, MODULES_EXT);
TRY_DLOPEN("%s%s/%s", homedir, USER_MODULES_DIR, modname);
TRY_DLOPEN("%s%s/%s%s", homedir, USER_MODULES_DIR, modname, MODULES_EXT);
TRY_DLOPEN("%s%s", MODULES_DIR, modname);
TRY_DLOPEN("%s/%s%s", MODULES_DIR, modname, MODULES_EXT);
return NULL;
}
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