2008-11-21 12:16:08 +00:00
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/*
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* driver.c: Helpers for loading drivers
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*
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2011-04-11 22:25:25 +00:00
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* Copyright (C) 2006-2011 Red Hat, Inc.
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2008-11-21 12:16:08 +00:00
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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2012-09-20 22:30:55 +00:00
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* License along with this library. If not, see
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2012-07-21 10:06:23 +00:00
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* <http://www.gnu.org/licenses/>.
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2008-11-21 12:16:08 +00:00
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*
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*/
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#include <config.h>
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#include <unistd.h>
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#include "driver.h"
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2012-12-12 18:06:53 +00:00
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#include "viralloc.h"
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2012-12-12 17:59:27 +00:00
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#include "virlog.h"
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2013-10-09 10:18:15 +00:00
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#include "virutil.h"
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2010-11-16 14:54:17 +00:00
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#include "configmake.h"
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2013-04-03 10:36:23 +00:00
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#include "virstring.h"
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2008-11-21 12:16:08 +00:00
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2014-02-28 12:16:17 +00:00
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VIR_LOG_INIT("driver");
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2011-01-21 17:42:07 +00:00
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#define DEFAULT_DRIVER_DIR LIBDIR "/libvirt/connection-driver"
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2008-11-21 12:16:08 +00:00
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#ifdef WITH_DRIVER_MODULES
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/* XXX re-implment this for other OS, or use libtools helper lib ? */
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2010-03-09 18:22:22 +00:00
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# include <dlfcn.h>
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2008-11-21 12:16:08 +00:00
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2012-04-02 17:51:11 +00:00
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static const char *moddir = NULL;
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void
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virDriverModuleInitialize(const char *defmoddir)
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{
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2013-10-09 10:18:15 +00:00
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const char *custommoddir = virGetEnvBlockSUID("LIBVIRT_DRIVER_DIR");
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2012-04-02 17:51:11 +00:00
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if (custommoddir)
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moddir = custommoddir;
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else if (defmoddir)
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moddir = defmoddir;
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else
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moddir = DEFAULT_DRIVER_DIR;
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VIR_DEBUG("Module dir %s", moddir);
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}
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2008-11-21 12:16:08 +00:00
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void *
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virDriverLoadModule(const char *name)
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{
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char *modfile = NULL, *regfunc = NULL;
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void *handle = NULL;
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int (*regsym)(void);
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if (moddir == NULL)
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2012-04-02 17:51:11 +00:00
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virDriverModuleInitialize(NULL);
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2008-11-21 12:16:08 +00:00
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2011-02-16 23:37:57 +00:00
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VIR_DEBUG("Module load %s", name);
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2008-11-21 12:16:08 +00:00
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2013-06-07 15:10:28 +00:00
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if (virAsprintfQuiet(&modfile, "%s/libvirt_driver_%s.so", moddir, name) < 0)
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2008-11-21 12:16:08 +00:00
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return NULL;
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if (access(modfile, R_OK) < 0) {
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2009-05-08 10:05:56 +00:00
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VIR_WARN("Module %s not accessible", modfile);
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2008-11-21 12:16:08 +00:00
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goto cleanup;
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}
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2014-03-05 17:20:50 +00:00
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virUpdateSelfLastChanged(modfile);
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2012-04-02 16:23:59 +00:00
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handle = dlopen(modfile, RTLD_NOW | RTLD_GLOBAL);
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2008-11-21 12:16:08 +00:00
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if (!handle) {
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2010-05-20 06:15:46 +00:00
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VIR_ERROR(_("failed to load module %s %s"), modfile, dlerror());
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2008-11-21 12:16:08 +00:00
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goto cleanup;
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}
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2013-06-07 15:10:28 +00:00
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if (virAsprintfQuiet(®func, "%sRegister", name) < 0) {
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2008-11-21 12:16:08 +00:00
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goto cleanup;
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}
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regsym = dlsym(handle, regfunc);
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if (!regsym) {
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2010-05-20 06:15:46 +00:00
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VIR_ERROR(_("Missing module registration symbol %s"), regfunc);
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2008-11-21 12:16:08 +00:00
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goto cleanup;
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}
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if ((*regsym)() < 0) {
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2010-05-20 06:15:46 +00:00
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VIR_ERROR(_("Failed module registration %s"), regfunc);
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2008-11-21 12:16:08 +00:00
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goto cleanup;
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}
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VIR_FREE(modfile);
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VIR_FREE(regfunc);
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return handle;
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cleanup:
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VIR_FREE(modfile);
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VIR_FREE(regfunc);
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if (handle)
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dlclose(handle);
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return NULL;
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}
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/* XXX unload modules, but we can't until we can unregister libvirt drivers */
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#endif
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