+// SPDX-FileCopyrightText: 2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+//
+// SPDX-License-Identifier: LGPL-2.1-only
+
#ifndef LTTNG_UST_CLOCK_H
#define LTTNG_UST_CLOCK_H
-/*
- * 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
- */
-
#include <stdint.h>
#include <stddef.h>
+#ifdef __cplusplus
+extern "C" {
+#endif
+
/*
* Set each callback for the trace clock override, and then enable the
* override. Those functions return negative error values on error, 0 on
* success.
*/
+typedef uint64_t (*lttng_ust_clock_read64_function)(void);
+typedef uint64_t (*lttng_ust_clock_freq_function)(void);
+typedef int (*lttng_ust_clock_uuid_function)(char *uuid);
+typedef const char *(*lttng_ust_clock_name_function)(void);
+typedef const char *(*lttng_ust_clock_description_function)(void);
+
/*
- * Set clock override read callback. This callback should return the
+ * Set/Get clock override read callback. This callback should return the
* current clock time (a 64-bit monotonic counter).
*/
-int lttng_ust_trace_clock_set_read64_cb(uint64_t (*read64)(void));
+int lttng_ust_trace_clock_set_read64_cb(lttng_ust_clock_read64_function read64_cb);
+int lttng_ust_trace_clock_get_read64_cb(lttng_ust_clock_read64_function *read64_cb);
/*
- * Set clock override frequency callback. This callback should return
+ * Set/Get clock override frequency callback. This callback should return
* the frequency of the clock in cycles per second.
*/
-int lttng_ust_trace_clock_set_freq_cb(uint64_t (*freq)(void));
+int lttng_ust_trace_clock_set_freq_cb(lttng_ust_clock_freq_function freq_cb);
+int lttng_ust_trace_clock_get_freq_cb(lttng_ust_clock_freq_function *freq_cb);
/*
- * Set clock override unique identifier.
+ * Set/Get clock override unique identifier.
* LTTNG_UST_UUID_STR_LEN is the maximum length of uuid string. Includes
* final \0.
*/
#define LTTNG_UST_UUID_STR_LEN 37
-int lttng_ust_trace_clock_set_uuid_cb(int (*uuid)(char *uuid));
+int lttng_ust_trace_clock_set_uuid_cb(lttng_ust_clock_uuid_function uuid_cb);
+int lttng_ust_trace_clock_get_uuid_cb(lttng_ust_clock_uuid_function *uuid_cb);
/*
- * Set clock override name.
+ * Set/Get clock override name.
*/
-int lttng_ust_trace_clock_set_name_cb(const char *(*name)(void));
+int lttng_ust_trace_clock_set_name_cb(lttng_ust_clock_name_function name_cb);
+int lttng_ust_trace_clock_get_name_cb(lttng_ust_clock_name_function *name_cb);
/*
- * Set clock override description.
+ * Set/Get clock override description.
*/
-int lttng_ust_trace_clock_set_description_cb(const char *(*description)(void));
+int lttng_ust_trace_clock_set_description_cb(lttng_ust_clock_description_function description_cb);
+int lttng_ust_trace_clock_get_description_cb(lttng_ust_clock_description_function *description_cb);
/*
* Use the clock override rather than the default clock.
*/
int lttng_ust_enable_trace_clock_override(void);
+#ifdef __cplusplus
+}
+#endif
+
#endif /* LTTNG_UST_CLOCK_H */