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97 lines
2.4 KiB
C
97 lines
2.4 KiB
C
/*
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* driver.c: Helpers for loading drivers
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*
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* Copyright (C) 2006-2008 Red Hat, Inc.
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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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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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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#include "memory.h"
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#include "logging.h"
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#define DEFAULT_DRIVER_DIR LIBDIR "/libvirt/drivers"
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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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#include <dlfcn.h>
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void *
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virDriverLoadModule(const char *name)
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{
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const char *moddir = getenv("LIBVIRT_DRIVER_DIR");
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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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moddir = DEFAULT_DRIVER_DIR;
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DEBUG("Module load %s", name);
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if (virAsprintf(&modfile, "%s/libvirt_driver_%s.so", moddir, name) < 0)
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return NULL;
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if (access(modfile, R_OK) < 0) {
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DEBUG("Moodule %s not accessible", modfile);
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goto cleanup;
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}
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handle = dlopen(modfile, RTLD_NOW | RTLD_LOCAL);
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if (!handle) {
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DEBUG("failed to load module %s %s", modfile, dlerror());
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goto cleanup;
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}
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if (virAsprintf(®func, "%sRegister", name) < 0) {
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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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DEBUG("Missing module registration symbol %s", regfunc);
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goto cleanup;
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}
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if ((*regsym)() < 0) {
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DEBUG("Failed module registration %s", regfunc);
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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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