From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Fri, 10 Apr 2015 22:31:28 +0000 (-0400)
Subject: Fix: add missing lttng-clock.c
X-Git-Tag: v2.7.0-rc1~45
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=e11fcffcd0fb20d821eba69875d0b72553260df6;p=lttng-ust.git

Fix: add missing lttng-clock.c

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/liblttng-ust/lttng-clock.c b/liblttng-ust/lttng-clock.c
new file mode 100644
index 00000000..557fc6b6
--- /dev/null
+++ b/liblttng-ust/lttng-clock.c
@@ -0,0 +1,118 @@
+/*
+ * 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"
+
+struct lttng_trace_clock *lttng_trace_clock;
+
+static
+struct lttng_trace_clock user_tc;
+
+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 *handle;
+	void (*libinit)(void);
+
+
+	libname = secure_getenv("LTTNG_UST_CLOCK_PLUGIN");
+	if (!libname)
+		return;
+	handle = dlopen(libname, RTLD_NOW);
+	if (!handle) {
+		PERROR("Cannot load LTTng UST clock override library %s",
+			libname);
+		return;
+	}
+	dlerror();
+	libinit = (void (*)(void)) dlsym(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();
+}