+++ /dev/null
-/*
- * 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-clock.h>
-#include <urcu/system.h>
-#include <urcu/arch.h>
-
-#include "clock.h"
-#include "getenv.h"
-
-struct lttng_trace_clock *lttng_trace_clock;
-
-static
-struct lttng_trace_clock user_tc;
-
-static
-void *clock_handle;
-
-int lttng_ust_trace_clock_set_read64_cb(uint64_t (*read64)(void))
-{
- if (CMM_LOAD_SHARED(lttng_trace_clock))
- return -EBUSY;
- user_tc.read64 = read64;
- return 0;
-}
-
-int lttng_ust_trace_clock_set_freq_cb(uint64_t (*freq)(void))
-{
- if (CMM_LOAD_SHARED(lttng_trace_clock))
- return -EBUSY;
- user_tc.freq = freq;
- return 0;
-}
-
-int lttng_ust_trace_clock_set_uuid_cb(int (*uuid)(char *uuid))
-{
- if (CMM_LOAD_SHARED(lttng_trace_clock))
- return -EBUSY;
- user_tc.uuid = uuid;
- return 0;
-}
-
-int lttng_ust_trace_clock_set_name_cb(const char *(*name)(void))
-{
- if (CMM_LOAD_SHARED(lttng_trace_clock))
- return -EBUSY;
- user_tc.name = name;
- return 0;
-}
-
-int lttng_ust_trace_clock_set_description_cb(const char *(*description)(void))
-{
- if (CMM_LOAD_SHARED(lttng_trace_clock))
- return -EBUSY;
- user_tc.description = description;
- return 0;
-}
-
-int lttng_ust_enable_trace_clock_override(void)
-{
- if (CMM_LOAD_SHARED(lttng_trace_clock))
- return -EBUSY;
- if (!user_tc.read64)
- return -EINVAL;
- if (!user_tc.freq)
- return -EINVAL;
- if (!user_tc.name)
- return -EINVAL;
- if (!user_tc.description)
- return -EINVAL;
- /* Use default uuid cb when NULL */
- cmm_smp_mb(); /* Store callbacks before trace clock */
- CMM_STORE_SHARED(lttng_trace_clock, &user_tc);
- return 0;
-}
-
-void lttng_ust_clock_init(void)
-{
- const char *libname;
- void (*libinit)(void);
-
- if (clock_handle)
- return;
- libname = lttng_secure_getenv("LTTNG_UST_CLOCK_PLUGIN");
- if (!libname)
- return;
- clock_handle = dlopen(libname, RTLD_NOW);
- if (!clock_handle) {
- PERROR("Cannot load LTTng UST clock override library %s",
- libname);
- return;
- }
- dlerror();
- libinit = (void (*)(void)) dlsym(clock_handle,
- "lttng_ust_clock_plugin_init");
- if (!libinit) {
- PERROR("Cannot find LTTng UST clock override library %s initialization function lttng_ust_clock_plugin_init()",
- libname);
- return;
- }
- libinit();
-}