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27d59ab7cd
There's this unwritten rule in libvirt that vir_function is translated into virFunction when needed (e.g. in remote protocol definition, python, ...). Up till now we ignored such translation in driver module loading and did fine. Well, we didn't have any module with an underscore in its name. But this will change in next commit. The problem is, once an a module is dlopen()-ed, we derive register function name from its name. So instead of "driver_subdriverRegister" do some magic to turn that into "driverSubdriverRegister". Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
121 lines
3.1 KiB
C
121 lines
3.1 KiB
C
/*
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* driver.c: Helpers for loading drivers
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*
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* Copyright (C) 2006-2011 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, see
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* <http://www.gnu.org/licenses/>.
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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 <c-ctype.h>
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#include "driver.h"
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#include "viralloc.h"
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#include "virfile.h"
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#include "virlog.h"
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#include "virutil.h"
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#include "configmake.h"
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#include "virstring.h"
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VIR_LOG_INIT("driver");
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#define DEFAULT_DRIVER_DIR LIBDIR "/libvirt/connection-driver"
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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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char *modfile = NULL, *regfunc = NULL, *fixedname = NULL;
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char *tmp;
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void *handle = NULL;
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int (*regsym)(void);
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VIR_DEBUG("Module load %s", name);
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if (!(modfile = virFileFindResourceFull(name,
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"libvirt_driver_",
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".so",
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"src/.libs",
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LIBDIR "/libvirt/connection-driver",
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"LIBVIRT_DRIVER_DIR")))
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return NULL;
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if (access(modfile, R_OK) < 0) {
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VIR_WARN("Module %s not accessible", modfile);
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goto cleanup;
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}
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virUpdateSelfLastChanged(modfile);
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handle = dlopen(modfile, RTLD_NOW | RTLD_GLOBAL);
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if (!handle) {
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VIR_ERROR(_("failed to load module %s %s"), modfile, dlerror());
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goto cleanup;
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}
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if (VIR_STRDUP_QUIET(fixedname, name) < 0) {
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VIR_ERROR(_("out of memory"));
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goto cleanup;
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}
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/* convert something_like_this into somethingLikeThis */
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while ((tmp = strchr(fixedname, '_'))) {
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memmove(tmp, tmp + 1, strlen(tmp));
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*tmp = c_toupper(*tmp);
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}
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if (virAsprintfQuiet(®func, "%sRegister", fixedname) < 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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VIR_ERROR(_("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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VIR_ERROR(_("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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VIR_FREE(fixedname);
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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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VIR_FREE(fixedname);
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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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