mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
synced 2025-03-09 00:00:00 +01:00
111 lines
2.4 KiB
C
111 lines
2.4 KiB
C
/** Loadable / plugin support.
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*
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2017, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLASnode
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
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#include <dlfcn.h>
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#include "plugin.h"
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/** Global list of all known plugins */
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struct list plugins = LIST_INIT();
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__attribute__((destructor(999))) static void __dtor_plugins()
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{
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list_destroy(&plugins, NULL, false);
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}
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int plugin_init(struct plugin *p)
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{
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assert(p->state == STATE_DESTROYED);
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p->state = STATE_INITIALIZED;
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return 0;
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}
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int plugin_parse(struct plugin *p, config_setting_t *cfg)
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{
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const char *path;
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path = config_setting_get_string(cfg);
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if (!path)
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cerror(cfg, "Setting 'plugin' must be a string.");
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return 0;
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}
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int plugin_load(struct plugin *p)
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{
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p->handle = dlopen(p->path, RTLD_NOW);
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if (!p->path)
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return -1;
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p->state = STATE_LOADED;
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return 0;
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}
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int plugin_unload(struct plugin *p)
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{
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int ret;
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assert(p->state == STATE_LOADED);
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ret = dlclose(p->handle);
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if (ret)
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return -1;
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p->state = STATE_UNLOADED;
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return 0;
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}
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int plugin_destroy(struct plugin *p)
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{
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assert(p->state != STATE_DESTROYED && p->state != STATE_LOADED);
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if (p->path)
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free(p->path);
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return 0;
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}
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struct plugin * plugin_lookup(enum plugin_type type, const char *name)
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{
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for (size_t i = 0; i < list_length(&plugins); i++) {
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struct plugin *p = list_at(&plugins, i);
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if (p->type == type && strcmp(p->name, name) == 0)
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return p;
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}
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return NULL;
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}
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void plugin_dump(enum plugin_type type)
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{
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for (size_t i = 0; i < list_length(&plugins); i++) {
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struct plugin *p = list_at(&plugins, i);
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if (p->type == type)
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printf(" - %-12s: %s\n", p->name, p->description);
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}
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}
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