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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 <c-ctype.h>
#include "driver.h"
#include "viralloc.h"
#include "virfile.h"
#include "virlog.h"
#include "virutil.h"
#include "configmake.h"
#include "virstring.h"
VIR_LOG_INIT("driver");
#ifdef WITH_DRIVER_MODULES
/* XXX re-implment this for other OS, or use libtools helper lib ? */
# include <dlfcn.h>
# define DEFAULT_DRIVER_DIR LIBDIR "/libvirt/connection-driver"
void *
virDriverLoadModule(const char *name)
{
char *modfile = NULL, *regfunc = NULL, *fixedname = NULL;
char *tmp;
void *handle = NULL;
int (*regsym)(void);
VIR_DEBUG("Module load %s", name);
if (!(modfile = virFileFindResourceFull(name,
"libvirt_driver_",
".so",
abs_topbuilddir "/src/.libs",
DEFAULT_DRIVER_DIR,
"LIBVIRT_DRIVER_DIR")))
return NULL;
if (access(modfile, R_OK) < 0) {
VIR_INFO("Module %s not accessible", modfile);
goto cleanup;
}
virUpdateSelfLastChanged(modfile);
handle = dlopen(modfile, RTLD_NOW | RTLD_GLOBAL);
if (!handle) {
VIR_ERROR(_("failed to load module %s %s"), modfile, dlerror());
goto cleanup;
}
if (VIR_STRDUP_QUIET(fixedname, name) < 0) {
VIR_ERROR(_("out of memory"));
goto cleanup;
}
/* convert something_like_this into somethingLikeThis */
while ((tmp = strchr(fixedname, '_'))) {
memmove(tmp, tmp + 1, strlen(tmp));
*tmp = c_toupper(*tmp);
}
if (virAsprintfQuiet(®func, "%sRegister", fixedname) < 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);
VIR_FREE(fixedname);
return handle;
cleanup:
VIR_FREE(modfile);
VIR_FREE(regfunc);
VIR_FREE(fixedname);
if (handle)
dlclose(handle);
return NULL;
}
/* XXX unload modules, but we can't until we can unregister libvirt drivers */
#endif
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