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/*
librc-plugin.c
Simple plugin handler
Copyright 2007 Gentoo Foundation
Released under the GPLv2
*/
#include <dlfcn.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "einfo.h"
#include "rc.h"
#include "rc-misc.h"
#include "rc-plugin.h"
#include "strlist.h"
typedef struct plugin
{
char *name;
void *handle;
int (*hook) (rc_hook_t hook, const char *name);
struct plugin *next;
} plugin_t;
static plugin_t *plugins = NULL;
void rc_plugin_load (void)
{
char **files;
char *file;
int i;
plugin_t *plugin = plugins;
/* Ensure some sanity here */
rc_plugin_unload ();
if (! rc_exists (RC_PLUGINDIR))
return;
files = rc_ls_dir (NULL, RC_PLUGINDIR, 0);
STRLIST_FOREACH (files, file, i)
{
char *p = rc_strcatpaths (RC_PLUGINDIR, file, NULL);
void *h = dlopen (p, RTLD_LAZY);
char *func;
void *f;
if (! h)
{
eerror ("dlopen `%s': %s", p, dlerror ());
free (p);
continue;
}
func = file;
file = strsep (&func, ".");
func = rc_xmalloc (strlen (file) + strlen ("__hook") + 1);
sprintf (func, "_%s_hook", file);
f = dlsym (h, func);
if (! f)
{
eerror ("`%s' does not expose the symbol `%s'", p, func);
dlclose (h);
}
else
{
if (plugin)
{
plugin->next = rc_xmalloc (sizeof (plugin_t));
plugin = plugin->next;
}
else
plugin = plugins = rc_xmalloc (sizeof (plugin_t));
memset (plugin, 0, sizeof (plugin_t));
plugin->name = strdup (file);
plugin->handle = h;
plugin->hook = f;
}
free (func);
free (p);
}
rc_strlist_free (files);
}
void rc_plugin_run (rc_hook_t hook, const char *value)
{
plugin_t *plugin = plugins;
while (plugin)
{
if (plugin->hook)
plugin->hook (hook, value);
plugin = plugin->next;
}
}
void rc_plugin_unload (void)
{
plugin_t *plugin = plugins;
plugin_t *next;
while (plugin)
{
next = plugin->next;
dlclose (plugin->handle);
free (plugin->name);
free (plugin);
plugin = next;
}
plugins = NULL;
}
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