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VILLASnode/lib/plugin.c

89 lines
1.6 KiB
C

/** Loadable / plugin support.
*
* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
* @copyright 2017, Institute for Automation of Complex Power Systems, EONERC
*********************************************************************************/
#include <dlfcn.h>
#include "plugin.h"
/** Global list of all known plugins */
struct list plugins;
int plugin_init(struct plugin *p, char *name, char *path)
{
p->name = strdup(name);
p->path = strdup(path);
p->state = PLUGIN_STATE_UNLOADED;
return 0;
}
int plugin_load(struct plugin *p)
{
p->handle = dlopen(p->path, RTLD_NOW);
if (!p->path)
return -1;
p->state = PLUGIN_STATE_LOADED;
return 0;
}
int plugin_unload(struct plugin *p)
{
int ret;
if (p->state != PLUGIN_STATE_LOADED)
return -1;
ret = dlclose(p->handle);
if (ret)
return -1;
p->state = PLUGIN_STATE_UNLOADED;
return 0;
}
int plugin_destroy(struct plugin *p)
{
if (p->state == PLUGIN_STATE_LOADED)
plugin_unload(p);
free(p->name);
free(p->path);
return 0;
}
int plugin_parse(struct plugin *p, config_setting_t *cfg)
{
const char *path;
path = config_setting_get_string(cfg);
if (!path)
cerror(cfg, "Setting 'plugin' must be a string.");
return 0;
}
struct plugin * plugin_lookup(enum plugin_type type, const char *name)
{
list_foreach(struct plugin *l, &plugins) {
if (l->type == type && strcmp(l->name, name) == 0)
return l;
}
return NULL;
}
void plugin_dump(enum plugin_type type)
{
list_foreach(struct plugin *p, &plugins) {
if (p->type == type)
printf(" - %-12s: %s\n", p->name, p->description);
}
}