/*
* Copyright (C) 2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* 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; version 2.1 of
* the License.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define _GNU_SOURCE
#include <error.h>
#include <dlfcn.h>
#include <stdlib.h>
#include <usterr-signal-safe.h>
#include <lttng/ust-getcpu.h>
#include <urcu/system.h>
#include <urcu/arch.h>
#include "getenv.h"
#include "../libringbuffer/getcpu.h"
int (*lttng_get_cpu)(void);
static
void *getcpu_handle;
int lttng_ust_getcpu_override(int (*getcpu)(void))
{
CMM_STORE_SHARED(lttng_get_cpu, getcpu);
return 0;
}
void lttng_ust_getcpu_init(void)
{
const char *libname;
void (*libinit)(void);
if (getcpu_handle)
return;
libname = lttng_secure_getenv("LTTNG_UST_GETCPU_PLUGIN");
if (!libname)
return;
getcpu_handle = dlopen(libname, RTLD_NOW);
if (!getcpu_handle) {
PERROR("Cannot load LTTng UST getcpu override library %s",
libname);
return;
}
dlerror();
libinit = (void (*)(void)) dlsym(getcpu_handle,
"lttng_ust_getcpu_plugin_init");
if (!libinit) {
PERROR("Cannot find LTTng UST getcpu override library %s initialization function lttng_ust_getcpu_plugin_init()",
libname);
return;
}
libinit();
}