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/*
* driver.c: Helpers for loading drivers
*
* Copyright (C) 2006-2011 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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 this library. If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#include <config.h>
#include <unistd.h>
#include "driver.h"
#include "viralloc.h"
#include "virlog.h"
#include "util.h"
#include "configmake.h"
#define DEFAULT_DRIVER_DIR LIBDIR "/libvirt/connection-driver"
#ifdef WITH_DRIVER_MODULES
/* XXX re-implment this for other OS, or use libtools helper lib ? */
# include <dlfcn.h>
static const char *moddir = NULL;
void
virDriverModuleInitialize(const char *defmoddir)
{
const char *custommoddir = getenv("LIBVIRT_DRIVER_DIR");
if (custommoddir)
moddir = custommoddir;
else if (defmoddir)
moddir = defmoddir;
else
moddir = DEFAULT_DRIVER_DIR;
VIR_DEBUG("Module dir %s", moddir);
}
void *
virDriverLoadModule(const char *name)
{
char *modfile = NULL, *regfunc = NULL;
void *handle = NULL;
int (*regsym)(void);
if (moddir == NULL)
virDriverModuleInitialize(NULL);
VIR_DEBUG("Module load %s", name);
if (virAsprintf(&modfile, "%s/libvirt_driver_%s.so", moddir, name) < 0)
return NULL;
if (access(modfile, R_OK) < 0) {
VIR_WARN("Module %s not accessible", modfile);
goto cleanup;
}
handle = dlopen(modfile, RTLD_NOW | RTLD_GLOBAL);
if (!handle) {
VIR_ERROR(_("failed to load module %s %s"), modfile, dlerror());
goto cleanup;
}
if (virAsprintf(®func, "%sRegister", name) < 0) {
goto cleanup;
}
regsym = dlsym(handle, regfunc);
if (!regsym) {
VIR_ERROR(_("Missing module registration symbol %s"), regfunc);
goto cleanup;
}
if ((*regsym)() < 0) {
VIR_ERROR(_("Failed module registration %s"), regfunc);
goto cleanup;
}
VIR_FREE(modfile);
VIR_FREE(regfunc);
return handle;
cleanup:
VIR_FREE(modfile);
VIR_FREE(regfunc);
if (handle)
dlclose(handle);
return NULL;
}
/* XXX unload modules, but we can't until we can unregister libvirt drivers */
#endif
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