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/**
* @file mce-modules.c
* Module handling for MCE
* <p>
* Copyright © 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
* Copyright (C) 2012-2019 Jolla Ltd.
* <p>
* @author David Weinehall <david.weinehall@nokia.com>
* @author Simo Piiroinen <simo.piiroinen@jollamobile.com>
*
* mce is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* mce 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 mce. If not, see <http://www.gnu.org/licenses/>.
*/
#include "mce-modules.h"
#include "mce.h"
#include "mce-log.h"
#include "mce-conf.h"
#include <stdio.h>
#include <gmodule.h>
/** List of all loaded modules */
static GSList *modules = NULL;
/**
* Dump information about mce modules to stdout
*/
void mce_modules_dump_info(void)
{
GModule *module;
gint i;
for (i = 0; (module = g_slist_nth_data(modules, i)) != NULL; i++) {
const gchar *modulename = g_module_name(module);
module_info_struct *modinfo;
gchar *tmp = NULL;
gpointer mip;
fprintf(stdout,
"\n"
"Module: %s\n", modulename);
if (g_module_symbol(module,
"module_info",
&mip) == FALSE) {
fprintf(stdout,
" %-32s\n",
"module lacks information");
continue;
}
modinfo = (module_info_struct *)mip;
fprintf(stdout,
" %-32s %s\n",
"name:",
modinfo->name ? modinfo->name : "<undefined>");
if (modinfo->depends != NULL)
tmp = g_strjoinv(",", (gchar **)(modinfo->depends));
fprintf(stdout,
" %-32s %s\n",
"depends:",
tmp ? tmp : "");
g_free(tmp);
tmp = NULL;
if (modinfo->recommends != NULL)
tmp = g_strjoinv(",", (gchar **)(modinfo->recommends));
fprintf(stdout,
" %-32s %s\n",
"recommends:",
tmp ? tmp : "");
g_free(tmp);
tmp = NULL;
if (modinfo->provides != NULL)
tmp = g_strjoinv(",", (gchar **)(modinfo->provides));
fprintf(stdout,
" %-32s %s\n",
"provides:",
tmp ? tmp : "");
g_free(tmp);
tmp = NULL;
if (modinfo->enhances != NULL)
tmp = g_strjoinv(",", (gchar **)(modinfo->enhances));
fprintf(stdout,
" %-32s %s\n",
"enhances:",
tmp ? tmp : "");
g_free(tmp);
tmp = NULL;
if (modinfo->conflicts != NULL)
tmp = g_strjoinv(",", (gchar **)(modinfo->conflicts));
fprintf(stdout,
" %-32s %s\n",
"conflicts:",
tmp ? tmp : "");
g_free(tmp);
tmp = NULL;
if (modinfo->replaces != NULL)
tmp = g_strjoinv(",", (gchar **)(modinfo->replaces));
fprintf(stdout,
" %-32s %s\n",
"replaces:",
tmp ? tmp : "");
g_free(tmp);
fprintf(stdout, " %-32s %d\n",
"priority:",
modinfo->priority);
}
}
/** Construct path for named mce plugin
*
* @param directory Location of the plugin
* @module_name Name of the plugin
*
* @return Path to shared object
*/
static gchar * mce_modules_build_path(const gchar *directory,
const gchar *module_name)
{
return g_strdup_printf("%s/%s.so", directory, module_name);
}
/**
* Init function for the mce-modules component
*
* @return TRUE on success, FALSE on failure
*/
gboolean mce_modules_init(void)
{
gchar **modlist = NULL;
gsize length;
gchar *path = NULL;
/* Get the module path */
path = mce_conf_get_string(MCE_CONF_MODULES_GROUP,
MCE_CONF_MODULES_PATH,
DEFAULT_MCE_MODULE_PATH);
/* Get the list modules to load */
modlist = mce_conf_get_string_list(MCE_CONF_MODULES_GROUP,
MCE_CONF_MODULES_MODULES,
&length);
if (modlist != NULL) {
gint i;
for (i = 0; modlist[i]; i++) {
GModule *module;
gchar *tmp = mce_modules_build_path(path, modlist[i]);
mce_log(LL_INFO,
"Loading module: %s from %s",
modlist[i], path);
if ((module = g_module_open(tmp, 0)) != NULL) {
/* XXX: check dependencies, conflicts, et al */
modules = g_slist_prepend(modules, module);
} else {
const char *err = g_module_error();
mce_log(LL_ERR, "%s", err ?: "unknown error");
mce_log(LL_ERR,
"Failed to load module: %s; skipping",
modlist[i]);
}
g_free(tmp);
}
g_strfreev(modlist);
}
g_free(path);
return TRUE;
}
/**
* Exit function for the mce-modules component
*/
void mce_modules_exit(void)
{
GModule *module;
gint i;
if (modules != NULL) {
for (i = 0; (module = g_slist_nth_data(modules, i)) != NULL; i++) {
if( mce_in_valgrind_mode() ) {
/* Do not actually unmap the plugins so that
* valgrind can still locate the symbols at
* exit time. */
gpointer addr = 0;
g_module_symbol(module, "g_module_unload", &addr);
if( addr ) {
mce_log(LL_WARN, "simulating module %s unload",
g_module_name(module));
void (*unload)(GModule *) = addr;
unload(module);
}
else {
mce_log(LL_WARN, "skipping module %s unload",
g_module_name(module));
}
continue;
}
g_module_close(module);
}
g_slist_free(modules);
modules = NULL;
}
return;
}