X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=liblttng-ust-ctl%2Fustctl.c;h=a12e9dd377a008a308e2a9433ca5f370c7d49dd9;hb=6ba6fd60507f8e045bdc4f1be14e9d99c6a15f7f;hp=fcb6f0d55c398f2cc534d7f8aa27c5f4e21b5657;hpb=1ff31389b273bb27a619a794ce414c65e73cb6ea;p=lttng-ust.git

diff --git a/liblttng-ust-ctl/ustctl.c b/liblttng-ust-ctl/ustctl.c
index fcb6f0d5..a12e9dd3 100644
--- a/liblttng-ust-ctl/ustctl.c
+++ b/liblttng-ust-ctl/ustctl.c
@@ -1,38 +1,40 @@
 /*
- * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
- * Copyright (C) 2011-2013 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * SPDX-License-Identifier: GPL-2.0-only
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License only.
- *
- * This program 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * Copyright (C) 2011 Julien Desfossez <julien.desfossez@polymtl.ca>
+ * Copyright (C) 2011-2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  */
 
-#define _GNU_SOURCE
+#include <stdint.h>
 #include <string.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#include <lttng/ust-config.h>
 #include <lttng/ust-ctl.h>
 #include <lttng/ust-abi.h>
-#include <lttng/ust-events.h>
-#include <sys/mman.h>
-#include <byteswap.h>
+#include <lttng/ust-endian.h>
 
 #include <usterr-signal-safe.h>
 #include <ust-comm.h>
-#include <helper.h>
+#include <ust-helper.h>
+#include "ust-compat.h"
 
 #include "../libringbuffer/backend.h"
 #include "../libringbuffer/frontend.h"
+#include "../liblttng-ust/ust-events-internal.h"
 #include "../liblttng-ust/wait.h"
 #include "../liblttng-ust/lttng-rb-clients.h"
 #include "../liblttng-ust/clock.h"
+#include "../liblttng-ust/getenv.h"
+#include "../liblttng-ust/lttng-tracer-core.h"
+#include "../liblttng-ust/lttng-counter-client.h"
+
+#include "../libcounter/shm.h"
+#include "../libcounter/smp.h"
+#include "../libcounter/counter.h"
 
 /*
  * Number of milliseconds to retry before failing metadata writes on
@@ -44,7 +46,7 @@
  * Channel representation within consumer.
  */
 struct ustctl_consumer_channel {
-	struct lttng_channel *chan;		/* lttng channel buffers */
+	struct lttng_ust_channel_buffer *chan;	/* lttng channel buffers */
 
 	/* initial attributes */
 	struct ustctl_consumer_channel_attr attr;
@@ -56,7 +58,6 @@ struct ustctl_consumer_channel {
  * Stream representation within consumer.
  */
 struct ustctl_consumer_stream {
-	struct lttng_ust_shm_handle *handle;	/* shared-memory handle */
 	struct lttng_ust_lib_ring_buffer *buf;
 	struct ustctl_consumer_channel *chan;
 	int shm_fd, wait_fd, wakeup_fd;
@@ -64,18 +65,24 @@ struct ustctl_consumer_stream {
 	uint64_t memory_map_size;
 };
 
-extern void lttng_ring_buffer_client_overwrite_init(void);
-extern void lttng_ring_buffer_client_overwrite_rt_init(void);
-extern void lttng_ring_buffer_client_discard_init(void);
-extern void lttng_ring_buffer_client_discard_rt_init(void);
-extern void lttng_ring_buffer_metadata_client_init(void);
-extern void lttng_ring_buffer_client_overwrite_exit(void);
-extern void lttng_ring_buffer_client_overwrite_rt_exit(void);
-extern void lttng_ring_buffer_client_discard_exit(void);
-extern void lttng_ring_buffer_client_discard_rt_exit(void);
-extern void lttng_ring_buffer_metadata_client_exit(void);
+#define USTCTL_COUNTER_ATTR_DIMENSION_MAX 8
+struct ustctl_counter_attr {
+	enum ustctl_counter_arithmetic arithmetic;
+	enum ustctl_counter_bitness bitness;
+	uint32_t nr_dimensions;
+	int64_t global_sum_step;
+	struct ustctl_counter_dimension dimensions[USTCTL_COUNTER_ATTR_DIMENSION_MAX];
+	bool coalesce_hits;
+};
 
-volatile enum ust_loglevel ust_loglevel;
+/*
+ * Counter representation within daemon.
+ */
+struct ustctl_daemon_counter {
+	struct lib_counter *counter;
+	const struct lttng_counter_ops *ops;
+	struct ustctl_counter_attr *attr;	/* initial attributes */
+};
 
 int ustctl_release_handle(int sock, int handle)
 {
@@ -86,7 +93,7 @@ int ustctl_release_handle(int sock, int handle)
 		return 0;
 	memset(&lum, 0, sizeof(lum));
 	lum.handle = handle;
-	lum.cmd = LTTNG_UST_RELEASE;
+	lum.cmd = LTTNG_UST_ABI_RELEASE;
 	return ustcomm_send_app_cmd(sock, &lum, &lur);
 }
 
@@ -94,7 +101,7 @@ int ustctl_release_handle(int sock, int handle)
  * If sock is negative, it means we don't have to notify the other side
  * (e.g. application has already vanished).
  */
-int ustctl_release_object(int sock, struct lttng_ust_object_data *data)
+int ustctl_release_object(int sock, struct lttng_ust_abi_object_data *data)
 {
 	int ret;
 
@@ -102,23 +109,26 @@ int ustctl_release_object(int sock, struct lttng_ust_object_data *data)
 		return -EINVAL;
 
 	switch (data->type) {
-	case LTTNG_UST_OBJECT_TYPE_CHANNEL:
+	case LTTNG_UST_ABI_OBJECT_TYPE_CHANNEL:
 		if (data->u.channel.wakeup_fd >= 0) {
 			ret = close(data->u.channel.wakeup_fd);
 			if (ret < 0) {
 				ret = -errno;
 				return ret;
 			}
+			data->u.channel.wakeup_fd = -1;
 		}
 		free(data->u.channel.data);
+		data->u.channel.data = NULL;
 		break;
-	case LTTNG_UST_OBJECT_TYPE_STREAM:
+	case LTTNG_UST_ABI_OBJECT_TYPE_STREAM:
 		if (data->u.stream.shm_fd >= 0) {
 			ret = close(data->u.stream.shm_fd);
 			if (ret < 0) {
 				ret = -errno;
 				return ret;
 			}
+			data->u.stream.shm_fd = -1;
 		}
 		if (data->u.stream.wakeup_fd >= 0) {
 			ret = close(data->u.stream.wakeup_fd);
@@ -126,10 +136,37 @@ int ustctl_release_object(int sock, struct lttng_ust_object_data *data)
 				ret = -errno;
 				return ret;
 			}
+			data->u.stream.wakeup_fd = -1;
+		}
+		break;
+	case LTTNG_UST_ABI_OBJECT_TYPE_EVENT:
+	case LTTNG_UST_ABI_OBJECT_TYPE_CONTEXT:
+	case LTTNG_UST_ABI_OBJECT_TYPE_EVENT_NOTIFIER_GROUP:
+	case LTTNG_UST_ABI_OBJECT_TYPE_EVENT_NOTIFIER:
+		break;
+	case LTTNG_UST_ABI_OBJECT_TYPE_COUNTER:
+		free(data->u.counter.data);
+		data->u.counter.data = NULL;
+		break;
+	case LTTNG_UST_ABI_OBJECT_TYPE_COUNTER_GLOBAL:
+		if (data->u.counter_global.shm_fd >= 0) {
+			ret = close(data->u.counter_global.shm_fd);
+			if (ret < 0) {
+				ret = -errno;
+				return ret;
+			}
+			data->u.counter_global.shm_fd = -1;
 		}
 		break;
-	case LTTNG_UST_OBJECT_TYPE_EVENT:
-	case LTTNG_UST_OBJECT_TYPE_CONTEXT:
+	case LTTNG_UST_ABI_OBJECT_TYPE_COUNTER_CPU:
+		if (data->u.counter_cpu.shm_fd >= 0) {
+			ret = close(data->u.counter_cpu.shm_fd);
+			if (ret < 0) {
+				ret = -errno;
+				return ret;
+			}
+			data->u.counter_cpu.shm_fd = -1;
+		}
 		break;
 	default:
 		assert(0);
@@ -148,8 +185,8 @@ int ustctl_register_done(int sock)
 
 	DBG("Sending register done command to %d", sock);
 	memset(&lum, 0, sizeof(lum));
-	lum.handle = LTTNG_UST_ROOT_HANDLE;
-	lum.cmd = LTTNG_UST_REGISTER_DONE;
+	lum.handle = LTTNG_UST_ABI_ROOT_HANDLE;
+	lum.cmd = LTTNG_UST_ABI_REGISTER_DONE;
 	ret = ustcomm_send_app_cmd(sock, &lum, &lur);
 	if (ret)
 		return ret;
@@ -167,8 +204,8 @@ int ustctl_create_session(int sock)
 
 	/* Create session */
 	memset(&lum, 0, sizeof(lum));
-	lum.handle = LTTNG_UST_ROOT_HANDLE;
-	lum.cmd = LTTNG_UST_SESSION;
+	lum.handle = LTTNG_UST_ABI_ROOT_HANDLE;
+	lum.cmd = LTTNG_UST_ABI_SESSION;
 	ret = ustcomm_send_app_cmd(sock, &lum, &lur);
 	if (ret)
 		return ret;
@@ -177,13 +214,13 @@ int ustctl_create_session(int sock)
 	return session_handle;
 }
 
-int ustctl_create_event(int sock, struct lttng_ust_event *ev,
-		struct lttng_ust_object_data *channel_data,
-		struct lttng_ust_object_data **_event_data)
+int ustctl_create_event(int sock, struct lttng_ust_abi_event *ev,
+		struct lttng_ust_abi_object_data *channel_data,
+		struct lttng_ust_abi_object_data **_event_data)
 {
 	struct ustcomm_ust_msg lum;
 	struct ustcomm_ust_reply lur;
-	struct lttng_ust_object_data *event_data;
+	struct lttng_ust_abi_object_data *event_data;
 	int ret;
 
 	if (!channel_data || !_event_data)
@@ -192,12 +229,12 @@ int ustctl_create_event(int sock, struct lttng_ust_event *ev,
 	event_data = zmalloc(sizeof(*event_data));
 	if (!event_data)
 		return -ENOMEM;
-	event_data->type = LTTNG_UST_OBJECT_TYPE_EVENT;
+	event_data->type = LTTNG_UST_ABI_OBJECT_TYPE_EVENT;
 	memset(&lum, 0, sizeof(lum));
 	lum.handle = channel_data->handle;
-	lum.cmd = LTTNG_UST_EVENT;
+	lum.cmd = LTTNG_UST_ABI_EVENT;
 	strncpy(lum.u.event.name, ev->name,
-		LTTNG_UST_SYM_NAME_LEN);
+		LTTNG_UST_ABI_SYM_NAME_LEN);
 	lum.u.event.instrumentation = ev->instrumentation;
 	lum.u.event.loglevel_type = ev->loglevel_type;
 	lum.u.event.loglevel = ev->loglevel;
@@ -213,12 +250,12 @@ int ustctl_create_event(int sock, struct lttng_ust_event *ev,
 }
 
 int ustctl_add_context(int sock, struct lttng_ust_context_attr *ctx,
-		struct lttng_ust_object_data *obj_data,
-		struct lttng_ust_object_data **_context_data)
+		struct lttng_ust_abi_object_data *obj_data,
+		struct lttng_ust_abi_object_data **_context_data)
 {
 	struct ustcomm_ust_msg lum;
 	struct ustcomm_ust_reply lur;
-	struct lttng_ust_object_data *context_data = NULL;
+	struct lttng_ust_abi_object_data *context_data = NULL;
 	char *buf = NULL;
 	size_t len;
 	int ret;
@@ -233,17 +270,17 @@ int ustctl_add_context(int sock, struct lttng_ust_context_attr *ctx,
 		ret = -ENOMEM;
 		goto end;
 	}
-	context_data->type = LTTNG_UST_OBJECT_TYPE_CONTEXT;
+	context_data->type = LTTNG_UST_ABI_OBJECT_TYPE_CONTEXT;
 	memset(&lum, 0, sizeof(lum));
 	lum.handle = obj_data->handle;
-	lum.cmd = LTTNG_UST_CONTEXT;
+	lum.cmd = LTTNG_UST_ABI_CONTEXT;
 
 	lum.u.context.ctx = ctx->ctx;
 	switch (ctx->ctx) {
-	case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER:
+	case LTTNG_UST_ABI_CONTEXT_PERF_THREAD_COUNTER:
 		lum.u.context.u.perf_counter = ctx->u.perf_counter;
 		break;
-	case LTTNG_UST_CONTEXT_APP_CONTEXT:
+	case LTTNG_UST_ABI_CONTEXT_APP_CONTEXT:
 	{
 		size_t provider_name_len = strlen(
 				ctx->u.app_ctx.provider_name) + 1;
@@ -295,8 +332,8 @@ end:
 	return ret;
 }
 
-int ustctl_set_filter(int sock, struct lttng_ust_filter_bytecode *bytecode,
-		struct lttng_ust_object_data *obj_data)
+int ustctl_set_filter(int sock, struct lttng_ust_abi_filter_bytecode *bytecode,
+		struct lttng_ust_abi_object_data *obj_data)
 {
 	struct ustcomm_ust_msg lum;
 	struct ustcomm_ust_reply lur;
@@ -307,7 +344,7 @@ int ustctl_set_filter(int sock, struct lttng_ust_filter_bytecode *bytecode,
 
 	memset(&lum, 0, sizeof(lum));
 	lum.handle = obj_data->handle;
-	lum.cmd = LTTNG_UST_FILTER;
+	lum.cmd = LTTNG_UST_ABI_FILTER;
 	lum.u.filter.data_size = bytecode->len;
 	lum.u.filter.reloc_offset = bytecode->reloc_offset;
 	lum.u.filter.seqnum = bytecode->seqnum;
@@ -326,8 +363,39 @@ int ustctl_set_filter(int sock, struct lttng_ust_filter_bytecode *bytecode,
 	return ustcomm_recv_app_reply(sock, &lur, lum.handle, lum.cmd);
 }
 
-int ustctl_set_exclusion(int sock, struct lttng_ust_event_exclusion *exclusion,
-		struct lttng_ust_object_data *obj_data)
+int ustctl_set_capture(int sock, struct lttng_ust_abi_capture_bytecode *bytecode,
+		struct lttng_ust_abi_object_data *obj_data)
+{
+	struct ustcomm_ust_msg lum;
+	struct ustcomm_ust_reply lur;
+	int ret;
+
+	if (!obj_data)
+		return -EINVAL;
+
+	memset(&lum, 0, sizeof(lum));
+	lum.handle = obj_data->handle;
+	lum.cmd = LTTNG_UST_ABI_CAPTURE;
+	lum.u.capture.data_size = bytecode->len;
+	lum.u.capture.reloc_offset = bytecode->reloc_offset;
+	lum.u.capture.seqnum = bytecode->seqnum;
+
+	ret = ustcomm_send_app_msg(sock, &lum);
+	if (ret)
+		return ret;
+	/* send var len bytecode */
+	ret = ustcomm_send_unix_sock(sock, bytecode->data,
+				bytecode->len);
+	if (ret < 0) {
+		return ret;
+	}
+	if (ret != bytecode->len)
+		return -EINVAL;
+	return ustcomm_recv_app_reply(sock, &lur, lum.handle, lum.cmd);
+}
+
+int ustctl_set_exclusion(int sock, struct lttng_ust_abi_event_exclusion *exclusion,
+		struct lttng_ust_abi_object_data *obj_data)
 {
 	struct ustcomm_ust_msg lum;
 	struct ustcomm_ust_reply lur;
@@ -339,7 +407,7 @@ int ustctl_set_exclusion(int sock, struct lttng_ust_event_exclusion *exclusion,
 
 	memset(&lum, 0, sizeof(lum));
 	lum.handle = obj_data->handle;
-	lum.cmd = LTTNG_UST_EXCLUSION;
+	lum.cmd = LTTNG_UST_ABI_EXCLUSION;
 	lum.u.exclusion.count = exclusion->count;
 
 	ret = ustcomm_send_app_msg(sock, &lum);
@@ -350,18 +418,18 @@ int ustctl_set_exclusion(int sock, struct lttng_ust_event_exclusion *exclusion,
 	/* send var len exclusion names */
 	ret = ustcomm_send_unix_sock(sock,
 			exclusion->names,
-			exclusion->count * LTTNG_UST_SYM_NAME_LEN);
+			exclusion->count * LTTNG_UST_ABI_SYM_NAME_LEN);
 	if (ret < 0) {
 		return ret;
 	}
-	if (ret != exclusion->count * LTTNG_UST_SYM_NAME_LEN) {
+	if (ret != exclusion->count * LTTNG_UST_ABI_SYM_NAME_LEN) {
 		return -EINVAL;
 	}
 	return ustcomm_recv_app_reply(sock, &lur, lum.handle, lum.cmd);
 }
 
 /* Enable event, channel and session ioctl */
-int ustctl_enable(int sock, struct lttng_ust_object_data *object)
+int ustctl_enable(int sock, struct lttng_ust_abi_object_data *object)
 {
 	struct ustcomm_ust_msg lum;
 	struct ustcomm_ust_reply lur;
@@ -372,7 +440,7 @@ int ustctl_enable(int sock, struct lttng_ust_object_data *object)
 
 	memset(&lum, 0, sizeof(lum));
 	lum.handle = object->handle;
-	lum.cmd = LTTNG_UST_ENABLE;
+	lum.cmd = LTTNG_UST_ABI_ENABLE;
 	ret = ustcomm_send_app_cmd(sock, &lum, &lur);
 	if (ret)
 		return ret;
@@ -381,7 +449,7 @@ int ustctl_enable(int sock, struct lttng_ust_object_data *object)
 }
 
 /* Disable event, channel and session ioctl */
-int ustctl_disable(int sock, struct lttng_ust_object_data *object)
+int ustctl_disable(int sock, struct lttng_ust_abi_object_data *object)
 {
 	struct ustcomm_ust_msg lum;
 	struct ustcomm_ust_reply lur;
@@ -392,7 +460,7 @@ int ustctl_disable(int sock, struct lttng_ust_object_data *object)
 
 	memset(&lum, 0, sizeof(lum));
 	lum.handle = object->handle;
-	lum.cmd = LTTNG_UST_DISABLE;
+	lum.cmd = LTTNG_UST_ABI_DISABLE;
 	ret = ustcomm_send_app_cmd(sock, &lum, &lur);
 	if (ret)
 		return ret;
@@ -402,7 +470,7 @@ int ustctl_disable(int sock, struct lttng_ust_object_data *object)
 
 int ustctl_start_session(int sock, int handle)
 {
-	struct lttng_ust_object_data obj;
+	struct lttng_ust_abi_object_data obj;
 
 	obj.handle = handle;
 	return ustctl_enable(sock, &obj);
@@ -410,12 +478,113 @@ int ustctl_start_session(int sock, int handle)
 
 int ustctl_stop_session(int sock, int handle)
 {
-	struct lttng_ust_object_data obj;
+	struct lttng_ust_abi_object_data obj;
 
 	obj.handle = handle;
 	return ustctl_disable(sock, &obj);
 }
 
+int ustctl_create_event_notifier_group(int sock, int pipe_fd,
+		struct lttng_ust_abi_object_data **_event_notifier_group_data)
+{
+	struct lttng_ust_abi_object_data *event_notifier_group_data;
+	struct ustcomm_ust_msg lum;
+	struct ustcomm_ust_reply lur;
+	ssize_t len;
+	int ret;
+
+	if (!_event_notifier_group_data)
+		return -EINVAL;
+
+	event_notifier_group_data = zmalloc(sizeof(*event_notifier_group_data));
+	if (!event_notifier_group_data)
+		return -ENOMEM;
+
+	event_notifier_group_data->type = LTTNG_UST_ABI_OBJECT_TYPE_EVENT_NOTIFIER_GROUP;
+
+	memset(&lum, 0, sizeof(lum));
+	lum.handle = LTTNG_UST_ABI_ROOT_HANDLE;
+	lum.cmd = LTTNG_UST_ABI_EVENT_NOTIFIER_GROUP_CREATE;
+
+	ret = ustcomm_send_app_msg(sock, &lum);
+	if (ret)
+		goto error;
+
+	/* Send event_notifier notification pipe. */
+	len = ustcomm_send_fds_unix_sock(sock, &pipe_fd, 1);
+	if (len <= 0) {
+		ret = len;
+		goto error;
+	}
+
+	ret = ustcomm_recv_app_reply(sock, &lur, lum.handle, lum.cmd);
+	if (ret)
+		goto error;
+
+	event_notifier_group_data->handle = lur.ret_val;
+	DBG("received event_notifier group handle %d", event_notifier_group_data->handle);
+
+	*_event_notifier_group_data = event_notifier_group_data;
+
+	ret = 0;
+	goto end;
+error:
+	free(event_notifier_group_data);
+
+end:
+	return ret;
+}
+
+int ustctl_create_event_notifier(int sock, struct lttng_ust_abi_event_notifier *event_notifier,
+		struct lttng_ust_abi_object_data *event_notifier_group,
+		struct lttng_ust_abi_object_data **_event_notifier_data)
+{
+	struct ustcomm_ust_msg lum;
+	struct ustcomm_ust_reply lur;
+	struct lttng_ust_abi_object_data *event_notifier_data;
+	ssize_t len;
+	int ret;
+
+	if (!event_notifier_group || !_event_notifier_data)
+		return -EINVAL;
+
+	event_notifier_data = zmalloc(sizeof(*event_notifier_data));
+	if (!event_notifier_data)
+		return -ENOMEM;
+
+	event_notifier_data->type = LTTNG_UST_ABI_OBJECT_TYPE_EVENT_NOTIFIER;
+
+	memset(&lum, 0, sizeof(lum));
+	lum.handle = event_notifier_group->handle;
+	lum.cmd = LTTNG_UST_ABI_EVENT_NOTIFIER_CREATE;
+	lum.u.event_notifier.len = sizeof(*event_notifier);
+
+	ret = ustcomm_send_app_msg(sock, &lum);
+	if (ret) {
+		free(event_notifier_data);
+		return ret;
+	}
+	/* Send struct lttng_ust_abi_event_notifier */
+	len = ustcomm_send_unix_sock(sock, event_notifier, sizeof(*event_notifier));
+	if (len != sizeof(*event_notifier)) {
+		free(event_notifier_data);
+		if (len < 0)
+			return len;
+		else
+			return -EIO;
+	}
+	ret = ustcomm_recv_app_reply(sock, &lur, lum.handle, lum.cmd);
+	if (ret) {
+		free(event_notifier_data);
+		return ret;
+	}
+	event_notifier_data->handle = lur.ret_val;
+	DBG("received event_notifier handle %u", event_notifier_data->handle);
+	*_event_notifier_data = event_notifier_data;
+
+	return ret;
+}
+
 int ustctl_tracepoint_list(int sock)
 {
 	struct ustcomm_ust_msg lum;
@@ -423,8 +592,8 @@ int ustctl_tracepoint_list(int sock)
 	int ret, tp_list_handle;
 
 	memset(&lum, 0, sizeof(lum));
-	lum.handle = LTTNG_UST_ROOT_HANDLE;
-	lum.cmd = LTTNG_UST_TRACEPOINT_LIST;
+	lum.handle = LTTNG_UST_ABI_ROOT_HANDLE;
+	lum.cmd = LTTNG_UST_ABI_TRACEPOINT_LIST;
 	ret = ustcomm_send_app_cmd(sock, &lum, &lur);
 	if (ret)
 		return ret;
@@ -434,7 +603,7 @@ int ustctl_tracepoint_list(int sock)
 }
 
 int ustctl_tracepoint_list_get(int sock, int tp_list_handle,
-		struct lttng_ust_tracepoint_iter *iter)
+		struct lttng_ust_abi_tracepoint_iter *iter)
 {
 	struct ustcomm_ust_msg lum;
 	struct ustcomm_ust_reply lur;
@@ -445,7 +614,7 @@ int ustctl_tracepoint_list_get(int sock, int tp_list_handle,
 
 	memset(&lum, 0, sizeof(lum));
 	lum.handle = tp_list_handle;
-	lum.cmd = LTTNG_UST_TRACEPOINT_LIST_GET;
+	lum.cmd = LTTNG_UST_ABI_TRACEPOINT_LIST_GET;
 	ret = ustcomm_send_app_cmd(sock, &lum, &lur);
 	if (ret)
 		return ret;
@@ -463,8 +632,8 @@ int ustctl_tracepoint_field_list(int sock)
 	int ret, tp_field_list_handle;
 
 	memset(&lum, 0, sizeof(lum));
-	lum.handle = LTTNG_UST_ROOT_HANDLE;
-	lum.cmd = LTTNG_UST_TRACEPOINT_FIELD_LIST;
+	lum.handle = LTTNG_UST_ABI_ROOT_HANDLE;
+	lum.cmd = LTTNG_UST_ABI_TRACEPOINT_FIELD_LIST;
 	ret = ustcomm_send_app_cmd(sock, &lum, &lur);
 	if (ret)
 		return ret;
@@ -474,7 +643,7 @@ int ustctl_tracepoint_field_list(int sock)
 }
 
 int ustctl_tracepoint_field_list_get(int sock, int tp_field_list_handle,
-		struct lttng_ust_field_iter *iter)
+		struct lttng_ust_abi_field_iter *iter)
 {
 	struct ustcomm_ust_msg lum;
 	struct ustcomm_ust_reply lur;
@@ -486,7 +655,7 @@ int ustctl_tracepoint_field_list_get(int sock, int tp_field_list_handle,
 
 	memset(&lum, 0, sizeof(lum));
 	lum.handle = tp_field_list_handle;
-	lum.cmd = LTTNG_UST_TRACEPOINT_FIELD_LIST_GET;
+	lum.cmd = LTTNG_UST_ABI_TRACEPOINT_FIELD_LIST_GET;
 	ret = ustcomm_send_app_cmd(sock, &lum, &lur);
 	if (ret)
 		return ret;
@@ -502,7 +671,7 @@ int ustctl_tracepoint_field_list_get(int sock, int tp_field_list_handle,
 	return 0;
 }
 
-int ustctl_tracer_version(int sock, struct lttng_ust_tracer_version *v)
+int ustctl_tracer_version(int sock, struct lttng_ust_abi_tracer_version *v)
 {
 	struct ustcomm_ust_msg lum;
 	struct ustcomm_ust_reply lur;
@@ -512,8 +681,8 @@ int ustctl_tracer_version(int sock, struct lttng_ust_tracer_version *v)
 		return -EINVAL;
 
 	memset(&lum, 0, sizeof(lum));
-	lum.handle = LTTNG_UST_ROOT_HANDLE;
-	lum.cmd = LTTNG_UST_TRACER_VERSION;
+	lum.handle = LTTNG_UST_ABI_ROOT_HANDLE;
+	lum.cmd = LTTNG_UST_ABI_TRACER_VERSION;
 	ret = ustcomm_send_app_cmd(sock, &lum, &lur);
 	if (ret)
 		return ret;
@@ -529,8 +698,8 @@ int ustctl_wait_quiescent(int sock)
 	int ret;
 
 	memset(&lum, 0, sizeof(lum));
-	lum.handle = LTTNG_UST_ROOT_HANDLE;
-	lum.cmd = LTTNG_UST_WAIT_QUIESCENT;
+	lum.handle = LTTNG_UST_ABI_ROOT_HANDLE;
+	lum.cmd = LTTNG_UST_ABI_WAIT_QUIESCENT;
 	ret = ustcomm_send_app_cmd(sock, &lum, &lur);
 	if (ret)
 		return ret;
@@ -538,7 +707,8 @@ int ustctl_wait_quiescent(int sock)
 	return 0;
 }
 
-int ustctl_calibrate(int sock, struct lttng_ust_calibrate *calibrate)
+int ustctl_calibrate(int sock __attribute__((unused)),
+		struct lttng_ust_abi_calibrate *calibrate)
 {
 	if (!calibrate)
 		return -EINVAL;
@@ -546,7 +716,7 @@ int ustctl_calibrate(int sock, struct lttng_ust_calibrate *calibrate)
 	return -ENOSYS;
 }
 
-int ustctl_sock_flush_buffer(int sock, struct lttng_ust_object_data *object)
+int ustctl_sock_flush_buffer(int sock, struct lttng_ust_abi_object_data *object)
 {
 	struct ustcomm_ust_msg lum;
 	struct ustcomm_ust_reply lur;
@@ -557,7 +727,7 @@ int ustctl_sock_flush_buffer(int sock, struct lttng_ust_object_data *object)
 
 	memset(&lum, 0, sizeof(lum));
 	lum.handle = object->handle;
-	lum.cmd = LTTNG_UST_FLUSH_BUFFER;
+	lum.cmd = LTTNG_UST_ABI_FLUSH_BUFFER;
 	ret = ustcomm_send_app_cmd(sock, &lum, &lur);
 	if (ret)
 		return ret;
@@ -567,7 +737,7 @@ int ustctl_sock_flush_buffer(int sock, struct lttng_ust_object_data *object)
 
 static
 int ustctl_send_channel(int sock,
-		enum lttng_ust_chan_type type,
+		enum lttng_ust_abi_chan_type type,
 		void *data,
 		uint64_t size,
 		int wakeup_fd,
@@ -675,9 +845,9 @@ int ustctl_send_stream(int sock,
 }
 
 int ustctl_recv_channel_from_consumer(int sock,
-		struct lttng_ust_object_data **_channel_data)
+		struct lttng_ust_abi_object_data **_channel_data)
 {
-	struct lttng_ust_object_data *channel_data;
+	struct lttng_ust_abi_object_data *channel_data;
 	ssize_t len;
 	int wakeup_fd;
 	int ret;
@@ -687,7 +857,7 @@ int ustctl_recv_channel_from_consumer(int sock,
 		ret = -ENOMEM;
 		goto error_alloc;
 	}
-	channel_data->type = LTTNG_UST_OBJECT_TYPE_CHANNEL;
+	channel_data->type = LTTNG_UST_ABI_OBJECT_TYPE_CHANNEL;
 	channel_data->handle = -1;
 
 	/* recv mmap size */
@@ -751,9 +921,9 @@ error_alloc:
 }
 
 int ustctl_recv_stream_from_consumer(int sock,
-		struct lttng_ust_object_data **_stream_data)
+		struct lttng_ust_abi_object_data **_stream_data)
 {
-	struct lttng_ust_object_data *stream_data;
+	struct lttng_ust_abi_object_data *stream_data;
 	ssize_t len;
 	int ret;
 	int fds[2];
@@ -764,7 +934,7 @@ int ustctl_recv_stream_from_consumer(int sock,
 		goto error_alloc;
 	}
 
-	stream_data->type = LTTNG_UST_OBJECT_TYPE_STREAM;
+	stream_data->type = LTTNG_UST_ABI_OBJECT_TYPE_STREAM;
 	stream_data->handle = -1;
 
 	/* recv mmap size */
@@ -816,7 +986,7 @@ error_alloc:
 }
 
 int ustctl_send_channel_to_ust(int sock, int session_handle,
-		struct lttng_ust_object_data *channel_data)
+		struct lttng_ust_abi_object_data *channel_data)
 {
 	struct ustcomm_ust_msg lum;
 	struct ustcomm_ust_reply lur;
@@ -827,7 +997,7 @@ int ustctl_send_channel_to_ust(int sock, int session_handle,
 
 	memset(&lum, 0, sizeof(lum));
 	lum.handle = session_handle;
-	lum.cmd = LTTNG_UST_CHANNEL;
+	lum.cmd = LTTNG_UST_ABI_CHANNEL;
 	lum.u.channel.len = channel_data->size;
 	lum.u.channel.type = channel_data->u.channel.type;
 	ret = ustcomm_send_app_msg(sock, &lum);
@@ -850,8 +1020,8 @@ int ustctl_send_channel_to_ust(int sock, int session_handle,
 }
 
 int ustctl_send_stream_to_ust(int sock,
-		struct lttng_ust_object_data *channel_data,
-		struct lttng_ust_object_data *stream_data)
+		struct lttng_ust_abi_object_data *channel_data,
+		struct lttng_ust_abi_object_data *stream_data)
 {
 	struct ustcomm_ust_msg lum;
 	struct ustcomm_ust_reply lur;
@@ -859,7 +1029,7 @@ int ustctl_send_stream_to_ust(int sock,
 
 	memset(&lum, 0, sizeof(lum));
 	lum.handle = channel_data->handle;
-	lum.cmd = LTTNG_UST_STREAM;
+	lum.cmd = LTTNG_UST_ABI_STREAM;
 	lum.u.stream.len = stream_data->size;
 	lum.u.stream.stream_nr = stream_data->u.stream.stream_nr;
 	ret = ustcomm_send_app_msg(sock, &lum);
@@ -867,7 +1037,7 @@ int ustctl_send_stream_to_ust(int sock,
 		return ret;
 
 	assert(stream_data);
-	assert(stream_data->type == LTTNG_UST_OBJECT_TYPE_STREAM);
+	assert(stream_data->type == LTTNG_UST_ABI_OBJECT_TYPE_STREAM);
 
 	ret = ustctl_send_stream(sock,
 			stream_data->u.stream.stream_nr,
@@ -879,10 +1049,10 @@ int ustctl_send_stream_to_ust(int sock,
 	return ustcomm_recv_app_reply(sock, &lur, lum.handle, lum.cmd);
 }
 
-int ustctl_duplicate_ust_object_data(struct lttng_ust_object_data **dest,
-                struct lttng_ust_object_data *src)
+int ustctl_duplicate_ust_object_data(struct lttng_ust_abi_object_data **dest,
+                struct lttng_ust_abi_object_data *src)
 {
-	struct lttng_ust_object_data *obj;
+	struct lttng_ust_abi_object_data *obj;
 	int ret;
 
 	if (src->handle != -1) {
@@ -901,7 +1071,7 @@ int ustctl_duplicate_ust_object_data(struct lttng_ust_object_data **dest,
 	obj->size = src->size;
 
 	switch (obj->type) {
-	case LTTNG_UST_OBJECT_TYPE_CHANNEL:
+	case LTTNG_UST_ABI_OBJECT_TYPE_CHANNEL:
 	{
 		obj->u.channel.type = src->u.channel.type;
 		if (src->u.channel.wakeup_fd >= 0) {
@@ -937,7 +1107,7 @@ int ustctl_duplicate_ust_object_data(struct lttng_ust_object_data **dest,
 
 	}
 
-	case LTTNG_UST_OBJECT_TYPE_STREAM:
+	case LTTNG_UST_ABI_OBJECT_TYPE_STREAM:
 	{
 		obj->u.stream.stream_nr = src->u.stream.stream_nr;
 		if (src->u.stream.wakeup_fd >= 0) {
@@ -978,6 +1148,44 @@ int ustctl_duplicate_ust_object_data(struct lttng_ust_object_data **dest,
 		goto error_type;
 	}
 
+	case LTTNG_UST_ABI_OBJECT_TYPE_COUNTER:
+	{
+		obj->u.counter.data = zmalloc(obj->size);
+		if (!obj->u.counter.data) {
+			ret = -ENOMEM;
+			goto error_type;
+		}
+		memcpy(obj->u.counter.data, src->u.counter.data, obj->size);
+		break;
+	}
+
+	case LTTNG_UST_ABI_OBJECT_TYPE_COUNTER_GLOBAL:
+	{
+		if (src->u.counter_global.shm_fd >= 0) {
+			obj->u.counter_global.shm_fd =
+				dup(src->u.counter_global.shm_fd);
+			if (obj->u.counter_global.shm_fd < 0) {
+				ret = errno;
+				goto error_type;
+			}
+		}
+		break;
+	}
+
+	case LTTNG_UST_ABI_OBJECT_TYPE_COUNTER_CPU:
+	{
+		obj->u.counter_cpu.cpu_nr = src->u.counter_cpu.cpu_nr;
+		if (src->u.counter_cpu.shm_fd >= 0) {
+			obj->u.counter_cpu.shm_fd =
+				dup(src->u.counter_cpu.shm_fd);
+			if (obj->u.counter_cpu.shm_fd < 0) {
+				ret = errno;
+				goto error_type;
+			}
+		}
+		break;
+	}
+
 	default:
 		ret = -EINVAL;
 		goto error_type;
@@ -1009,8 +1217,8 @@ struct ustctl_consumer_channel *
 	struct lttng_transport *transport;
 
 	switch (attr->type) {
-	case LTTNG_UST_CHAN_PER_CPU:
-		if (attr->output == LTTNG_UST_MMAP) {
+	case LTTNG_UST_ABI_CHAN_PER_CPU:
+		if (attr->output == LTTNG_UST_ABI_MMAP) {
 			if (attr->overwrite) {
 				if (attr->read_timer_interval == 0) {
 					transport_name = "relay-overwrite-mmap";
@@ -1028,8 +1236,8 @@ struct ustctl_consumer_channel *
 			return NULL;
 		}
 		break;
-	case LTTNG_UST_CHAN_METADATA:
-		if (attr->output == LTTNG_UST_MMAP)
+	case LTTNG_UST_ABI_CHAN_METADATA:
+		if (attr->output == LTTNG_UST_ABI_MMAP)
 			transport_name = "relay-metadata-mmap";
 		else
 			return NULL;
@@ -1039,7 +1247,7 @@ struct ustctl_consumer_channel *
 		return NULL;
 	}
 
-	transport = lttng_transport_find(transport_name);
+	transport = lttng_ust_transport_find(transport_name);
 	if (!transport) {
 		DBG("LTTng transport %s not found\n",
 			transport_name);
@@ -1050,12 +1258,13 @@ struct ustctl_consumer_channel *
 	if (!chan)
 		return NULL;
 
-	chan->chan = transport->ops.channel_create(transport_name, NULL,
+	chan->chan = transport->ops.priv->channel_create(transport_name, NULL,
 			attr->subbuf_size, attr->num_subbuf,
 			attr->switch_timer_interval,
 			attr->read_timer_interval,
 			attr->uuid, attr->chan_id,
-			stream_fds, nr_stream_fds);
+			stream_fds, nr_stream_fds,
+			attr->blocking_timeout);
 	if (!chan->chan) {
 		goto chan_error;
 	}
@@ -1074,7 +1283,7 @@ void ustctl_destroy_channel(struct ustctl_consumer_channel *chan)
 {
 	(void) ustctl_channel_close_wait_fd(chan);
 	(void) ustctl_channel_close_wakeup_fd(chan);
-	chan->chan->ops->channel_destroy(chan->chan);
+	chan->chan->ops->priv->channel_destroy(chan->chan);
 	free(chan);
 }
 
@@ -1083,7 +1292,7 @@ int ustctl_send_channel_to_sessiond(int sock,
 {
 	struct shm_object_table *table;
 
-	table = channel->chan->handle->table;
+	table = channel->chan->priv->rb_chan->handle->table;
 	if (table->size <= 0)
 		return -EINVAL;
 	return ustctl_send_channel(sock,
@@ -1113,17 +1322,17 @@ int ustctl_write_metadata_to_channel(
 		size_t len)			/* metadata length */
 {
 	struct lttng_ust_lib_ring_buffer_ctx ctx;
-	struct lttng_channel *chan = channel->chan;
+	struct lttng_ust_channel_buffer *lttng_chan_buf = channel->chan;
+	struct lttng_ust_lib_ring_buffer_channel *rb_chan = lttng_chan_buf->priv->rb_chan;
 	const char *str = metadata_str;
 	int ret = 0, waitret;
 	size_t reserve_len, pos;
 
 	for (pos = 0; pos < len; pos += reserve_len) {
 		reserve_len = min_t(size_t,
-				chan->ops->packet_avail_size(chan->chan, chan->handle),
+				lttng_chan_buf->ops->priv->packet_avail_size(lttng_chan_buf),
 				len - pos);
-		lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL, reserve_len,
-					 sizeof(char), -1, chan->handle, NULL);
+		lttng_ust_lib_ring_buffer_ctx_init(&ctx, rb_chan, reserve_len, sizeof(char), NULL);
 		/*
 		 * We don't care about metadata buffer's records lost
 		 * count, because we always retry here. Report error if
@@ -1132,7 +1341,7 @@ int ustctl_write_metadata_to_channel(
 		 */
 		waitret = wait_cond_interruptible_timeout(
 			({
-				ret = chan->ops->event_reserve(&ctx, 0);
+				ret = lttng_chan_buf->ops->event_reserve(&ctx);
 				ret != -ENOBUFS || !ret;
 			}),
 			LTTNG_METADATA_TIMEOUT_MSEC);
@@ -1144,8 +1353,8 @@ int ustctl_write_metadata_to_channel(
 				ret = waitret;
 			goto end;
 		}
-		chan->ops->event_write(&ctx, &str[pos], reserve_len);
-		chan->ops->event_commit(&ctx);
+		lttng_chan_buf->ops->event_write(&ctx, &str[pos], reserve_len, 1);
+		lttng_chan_buf->ops->event_commit(&ctx);
 	}
 end:
 	return ret;
@@ -1161,25 +1370,25 @@ ssize_t ustctl_write_one_packet_to_channel(
 		size_t len)			/* metadata length */
 {
 	struct lttng_ust_lib_ring_buffer_ctx ctx;
-	struct lttng_channel *chan = channel->chan;
+	struct lttng_ust_channel_buffer *lttng_chan_buf = channel->chan;
+	struct lttng_ust_lib_ring_buffer_channel *rb_chan = lttng_chan_buf->priv->rb_chan;
 	const char *str = metadata_str;
 	ssize_t reserve_len;
 	int ret;
 
 	reserve_len = min_t(ssize_t,
-			chan->ops->packet_avail_size(chan->chan, chan->handle),
+			lttng_chan_buf->ops->priv->packet_avail_size(lttng_chan_buf),
 			len);
-	lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL, reserve_len,
-			sizeof(char), -1, chan->handle, NULL);
-	ret = chan->ops->event_reserve(&ctx, 0);
+	lttng_ust_lib_ring_buffer_ctx_init(&ctx, rb_chan, reserve_len, sizeof(char), NULL);
+	ret = lttng_chan_buf->ops->event_reserve(&ctx);
 	if (ret != 0) {
 		DBG("LTTng: event reservation failed");
 		assert(ret < 0);
 		reserve_len = ret;
 		goto end;
 	}
-	chan->ops->event_write(&ctx, str, reserve_len);
-	chan->ops->event_commit(&ctx);
+	lttng_chan_buf->ops->event_write(&ctx, str, reserve_len, 1);
+	lttng_chan_buf->ops->event_commit(&ctx);
 
 end:
 	return reserve_len;
@@ -1187,10 +1396,10 @@ end:
 
 int ustctl_channel_close_wait_fd(struct ustctl_consumer_channel *consumer_chan)
 {
-	struct channel *chan;
+	struct lttng_ust_lib_ring_buffer_channel *chan;
 	int ret;
 
-	chan = consumer_chan->chan->chan;
+	chan = consumer_chan->chan->priv->rb_chan;
 	ret = ring_buffer_channel_close_wait_fd(&chan->backend.config,
 			chan, chan->handle);
 	if (!ret)
@@ -1200,10 +1409,10 @@ int ustctl_channel_close_wait_fd(struct ustctl_consumer_channel *consumer_chan)
 
 int ustctl_channel_close_wakeup_fd(struct ustctl_consumer_channel *consumer_chan)
 {
-	struct channel *chan;
+	struct lttng_ust_lib_ring_buffer_channel *chan;
 	int ret;
 
-	chan = consumer_chan->chan->chan;
+	chan = consumer_chan->chan->priv->rb_chan;
 	ret = ring_buffer_channel_close_wakeup_fd(&chan->backend.config,
 			chan, chan->handle);
 	if (!ret)
@@ -1213,20 +1422,20 @@ int ustctl_channel_close_wakeup_fd(struct ustctl_consumer_channel *consumer_chan
 
 int ustctl_stream_close_wait_fd(struct ustctl_consumer_stream *stream)
 {
-	struct channel *chan;
+	struct lttng_ust_lib_ring_buffer_channel *chan;
 
-	chan = stream->chan->chan->chan;
+	chan = stream->chan->chan->priv->rb_chan;
 	return ring_buffer_stream_close_wait_fd(&chan->backend.config,
-			chan, stream->handle, stream->cpu);
+			chan, chan->handle, stream->cpu);
 }
 
 int ustctl_stream_close_wakeup_fd(struct ustctl_consumer_stream *stream)
 {
-	struct channel *chan;
+	struct lttng_ust_lib_ring_buffer_channel *chan;
 
-	chan = stream->chan->chan->chan;
+	chan = stream->chan->chan->priv->rb_chan;
 	return ring_buffer_stream_close_wakeup_fd(&chan->backend.config,
-			chan, stream->handle, stream->cpu);
+			chan, chan->handle, stream->cpu);
 }
 
 struct ustctl_consumer_stream *
@@ -1235,7 +1444,7 @@ struct ustctl_consumer_stream *
 {
 	struct ustctl_consumer_stream *stream;
 	struct lttng_ust_shm_handle *handle;
-	struct channel *chan;
+	struct lttng_ust_lib_ring_buffer_channel *rb_chan;
 	int shm_fd, wait_fd, wakeup_fd;
 	uint64_t memory_map_size;
 	struct lttng_ust_lib_ring_buffer *buf;
@@ -1243,13 +1452,13 @@ struct ustctl_consumer_stream *
 
 	if (!channel)
 		return NULL;
-	handle = channel->chan->handle;
+	rb_chan = channel->chan->priv->rb_chan;
+	handle = rb_chan->handle;
 	if (!handle)
 		return NULL;
 
-	chan = channel->chan->chan;
-	buf = channel_get_ring_buffer(&chan->backend.config,
-		chan, cpu, handle, &shm_fd, &wait_fd,
+	buf = channel_get_ring_buffer(&rb_chan->backend.config,
+		rb_chan, cpu, handle, &shm_fd, &wait_fd,
 		&wakeup_fd, &memory_map_size);
 	if (!buf)
 		return NULL;
@@ -1260,7 +1469,6 @@ struct ustctl_consumer_stream *
 	stream = zmalloc(sizeof(*stream));
 	if (!stream)
 		goto alloc_error;
-	stream->handle = handle;
 	stream->buf = buf;
 	stream->chan = channel;
 	stream->shm_fd = shm_fd;
@@ -1284,7 +1492,7 @@ void ustctl_destroy_stream(struct ustctl_consumer_stream *stream)
 	consumer_chan = stream->chan;
 	(void) ustctl_stream_close_wait_fd(stream);
 	(void) ustctl_stream_close_wakeup_fd(stream);
-	lib_ring_buffer_release_read(buf, consumer_chan->chan->handle);
+	lib_ring_buffer_release_read(buf, consumer_chan->chan->priv->rb_chan->handle);
 	free(stream);
 }
 
@@ -1292,16 +1500,16 @@ int ustctl_channel_get_wait_fd(struct ustctl_consumer_channel *chan)
 {
 	if (!chan)
 		return -EINVAL;
-	return shm_get_wait_fd(chan->chan->handle,
-		&chan->chan->handle->chan._ref);
+	return shm_get_wait_fd(chan->chan->priv->rb_chan->handle,
+		&chan->chan->priv->rb_chan->handle->chan._ref);
 }
 
 int ustctl_channel_get_wakeup_fd(struct ustctl_consumer_channel *chan)
 {
 	if (!chan)
 		return -EINVAL;
-	return shm_get_wakeup_fd(chan->chan->handle,
-		&chan->chan->handle->chan._ref);
+	return shm_get_wakeup_fd(chan->chan->priv->rb_chan->handle,
+		&chan->chan->priv->rb_chan->handle->chan._ref);
 }
 
 int ustctl_stream_get_wait_fd(struct ustctl_consumer_stream *stream)
@@ -1313,7 +1521,7 @@ int ustctl_stream_get_wait_fd(struct ustctl_consumer_stream *stream)
 		return -EINVAL;
 	buf = stream->buf;
 	consumer_chan = stream->chan;
-	return shm_get_wait_fd(consumer_chan->chan->handle, &buf->self._ref);
+	return shm_get_wait_fd(consumer_chan->chan->priv->rb_chan->handle, &buf->self._ref);
 }
 
 int ustctl_stream_get_wakeup_fd(struct ustctl_consumer_stream *stream)
@@ -1325,7 +1533,7 @@ int ustctl_stream_get_wakeup_fd(struct ustctl_consumer_stream *stream)
 		return -EINVAL;
 	buf = stream->buf;
 	consumer_chan = stream->chan;
-	return shm_get_wakeup_fd(consumer_chan->chan->handle, &buf->self._ref);
+	return shm_get_wakeup_fd(consumer_chan->chan->priv->rb_chan->handle, &buf->self._ref);
 }
 
 /* For mmap mode, readable without "get" operation */
@@ -1339,7 +1547,7 @@ void *ustctl_get_mmap_base(struct ustctl_consumer_stream *stream)
 		return NULL;
 	buf = stream->buf;
 	consumer_chan = stream->chan;
-	return shmp(consumer_chan->chan->handle, buf->backend.memory_map);
+	return shmp(consumer_chan->chan->priv->rb_chan->handle, buf->backend.memory_map);
 }
 
 /* returns the length to mmap. */
@@ -1348,17 +1556,17 @@ int ustctl_get_mmap_len(struct ustctl_consumer_stream *stream,
 {
 	struct ustctl_consumer_channel *consumer_chan;
 	unsigned long mmap_buf_len;
-	struct channel *chan;
+	struct lttng_ust_lib_ring_buffer_channel *rb_chan;
 
 	if (!stream)
 		return -EINVAL;
 	consumer_chan = stream->chan;
-	chan = consumer_chan->chan->chan;
-	if (chan->backend.config.output != RING_BUFFER_MMAP)
+	rb_chan = consumer_chan->chan->priv->rb_chan;
+	if (rb_chan->backend.config.output != RING_BUFFER_MMAP)
 		return -EINVAL;
-	mmap_buf_len = chan->backend.buf_size;
-	if (chan->backend.extra_reader_sb)
-		mmap_buf_len += chan->backend.subbuf_size;
+	mmap_buf_len = rb_chan->backend.buf_size;
+	if (rb_chan->backend.extra_reader_sb)
+		mmap_buf_len += rb_chan->backend.subbuf_size;
 	if (mmap_buf_len > INT_MAX)
 		return -EFBIG;
 	*len = mmap_buf_len;
@@ -1370,13 +1578,13 @@ int ustctl_get_max_subbuf_size(struct ustctl_consumer_stream *stream,
 		unsigned long *len)
 {
 	struct ustctl_consumer_channel *consumer_chan;
-	struct channel *chan;
+	struct lttng_ust_lib_ring_buffer_channel *rb_chan;
 
 	if (!stream)
 		return -EINVAL;
 	consumer_chan = stream->chan;
-	chan = consumer_chan->chan->chan;
-	*len = chan->backend.subbuf_size;
+	rb_chan = consumer_chan->chan->priv->rb_chan;
+	*len = rb_chan->backend.subbuf_size;
 	return 0;
 }
 
@@ -1389,7 +1597,7 @@ int ustctl_get_max_subbuf_size(struct ustctl_consumer_stream *stream,
 int ustctl_get_mmap_read_offset(struct ustctl_consumer_stream *stream,
 		unsigned long *off)
 {
-	struct channel *chan;
+	struct lttng_ust_lib_ring_buffer_channel *rb_chan;
 	unsigned long sb_bindex;
 	struct lttng_ust_lib_ring_buffer *buf;
 	struct ustctl_consumer_channel *consumer_chan;
@@ -1400,16 +1608,16 @@ int ustctl_get_mmap_read_offset(struct ustctl_consumer_stream *stream,
 		return -EINVAL;
 	buf = stream->buf;
 	consumer_chan = stream->chan;
-	chan = consumer_chan->chan->chan;
-	if (chan->backend.config.output != RING_BUFFER_MMAP)
+	rb_chan = consumer_chan->chan->priv->rb_chan;
+	if (rb_chan->backend.config.output != RING_BUFFER_MMAP)
 		return -EINVAL;
-	sb_bindex = subbuffer_id_get_index(&chan->backend.config,
+	sb_bindex = subbuffer_id_get_index(&rb_chan->backend.config,
 					buf->backend.buf_rsb.id);
-	barray_idx = shmp_index(consumer_chan->chan->handle, buf->backend.array,
+	barray_idx = shmp_index(rb_chan->handle, buf->backend.array,
 			sb_bindex);
 	if (!barray_idx)
 		return -EINVAL;
-	pages = shmp(consumer_chan->chan->handle, barray_idx->shmp);
+	pages = shmp(rb_chan->handle, barray_idx->shmp);
 	if (!pages)
 		return -EINVAL;
 	*off = pages->mmap_offset;
@@ -1421,7 +1629,7 @@ int ustctl_get_subbuf_size(struct ustctl_consumer_stream *stream,
 		unsigned long *len)
 {
 	struct ustctl_consumer_channel *consumer_chan;
-	struct channel *chan;
+	struct lttng_ust_lib_ring_buffer_channel *rb_chan;
 	struct lttng_ust_lib_ring_buffer *buf;
 
 	if (!stream)
@@ -1429,9 +1637,9 @@ int ustctl_get_subbuf_size(struct ustctl_consumer_stream *stream,
 
 	buf = stream->buf;
 	consumer_chan = stream->chan;
-	chan = consumer_chan->chan->chan;
-	*len = lib_ring_buffer_get_read_data_size(&chan->backend.config, buf,
-		consumer_chan->chan->handle);
+	rb_chan = consumer_chan->chan->priv->rb_chan;
+	*len = lib_ring_buffer_get_read_data_size(&rb_chan->backend.config, buf,
+		rb_chan->handle);
 	return 0;
 }
 
@@ -1440,17 +1648,17 @@ int ustctl_get_padded_subbuf_size(struct ustctl_consumer_stream *stream,
 		unsigned long *len)
 {
 	struct ustctl_consumer_channel *consumer_chan;
-	struct channel *chan;
+	struct lttng_ust_lib_ring_buffer_channel *rb_chan;
 	struct lttng_ust_lib_ring_buffer *buf;
 
 	if (!stream)
 		return -EINVAL;
 	buf = stream->buf;
 	consumer_chan = stream->chan;
-	chan = consumer_chan->chan->chan;
-	*len = lib_ring_buffer_get_read_data_size(&chan->backend.config, buf,
-		consumer_chan->chan->handle);
-	*len = PAGE_ALIGN(*len);
+	rb_chan = consumer_chan->chan->priv->rb_chan;
+	*len = lib_ring_buffer_get_read_data_size(&rb_chan->backend.config, buf,
+		rb_chan->handle);
+	*len = LTTNG_UST_PAGE_ALIGN(*len);
 	return 0;
 }
 
@@ -1465,7 +1673,7 @@ int ustctl_get_next_subbuf(struct ustctl_consumer_stream *stream)
 	buf = stream->buf;
 	consumer_chan = stream->chan;
 	return lib_ring_buffer_get_next_subbuf(buf,
-			consumer_chan->chan->handle);
+			consumer_chan->chan->priv->rb_chan->handle);
 }
 
 
@@ -1479,7 +1687,7 @@ int ustctl_put_next_subbuf(struct ustctl_consumer_stream *stream)
 		return -EINVAL;
 	buf = stream->buf;
 	consumer_chan = stream->chan;
-	lib_ring_buffer_put_next_subbuf(buf, consumer_chan->chan->handle);
+	lib_ring_buffer_put_next_subbuf(buf, consumer_chan->chan->priv->rb_chan->handle);
 	return 0;
 }
 
@@ -1496,7 +1704,26 @@ int ustctl_snapshot(struct ustctl_consumer_stream *stream)
 	buf = stream->buf;
 	consumer_chan = stream->chan;
 	return lib_ring_buffer_snapshot(buf, &buf->cons_snapshot,
-			&buf->prod_snapshot, consumer_chan->chan->handle);
+			&buf->prod_snapshot, consumer_chan->chan->priv->rb_chan->handle);
+}
+
+/*
+ * Get a snapshot of the current ring buffer producer and consumer positions
+ * even if the consumed and produced positions are contained within the same
+ * subbuffer.
+ */
+int ustctl_snapshot_sample_positions(struct ustctl_consumer_stream *stream)
+{
+	struct lttng_ust_lib_ring_buffer *buf;
+	struct ustctl_consumer_channel *consumer_chan;
+
+	if (!stream)
+		return -EINVAL;
+	buf = stream->buf;
+	consumer_chan = stream->chan;
+	return lib_ring_buffer_snapshot_sample_positions(buf,
+			&buf->cons_snapshot, &buf->prod_snapshot,
+			consumer_chan->chan->priv->rb_chan->handle);
 }
 
 /* Get the consumer position (iteration start) */
@@ -1537,7 +1764,7 @@ int ustctl_get_subbuf(struct ustctl_consumer_stream *stream,
 	buf = stream->buf;
 	consumer_chan = stream->chan;
 	return lib_ring_buffer_get_subbuf(buf, *pos,
-			consumer_chan->chan->handle);
+			consumer_chan->chan->priv->rb_chan->handle);
 }
 
 /* Release exclusive sub-buffer access */
@@ -1550,7 +1777,7 @@ int ustctl_put_subbuf(struct ustctl_consumer_stream *stream)
 		return -EINVAL;
 	buf = stream->buf;
 	consumer_chan = stream->chan;
-	lib_ring_buffer_put_subbuf(buf, consumer_chan->chan->handle);
+	lib_ring_buffer_put_subbuf(buf, consumer_chan->chan->priv->rb_chan->handle);
 	return 0;
 }
 
@@ -1565,21 +1792,30 @@ void ustctl_flush_buffer(struct ustctl_consumer_stream *stream,
 	consumer_chan = stream->chan;
 	lib_ring_buffer_switch_slow(buf,
 		producer_active ? SWITCH_ACTIVE : SWITCH_FLUSH,
-		consumer_chan->chan->handle);
+		consumer_chan->chan->priv->rb_chan->handle);
+}
+
+void ustctl_clear_buffer(struct ustctl_consumer_stream *stream)
+{
+	struct lttng_ust_lib_ring_buffer *buf;
+	struct ustctl_consumer_channel *consumer_chan;
+
+	assert(stream);
+	buf = stream->buf;
+	consumer_chan = stream->chan;
+	lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE,
+		consumer_chan->chan->priv->rb_chan->handle);
+	lib_ring_buffer_clear_reader(buf, consumer_chan->chan->priv->rb_chan->handle);
 }
 
 static
 struct lttng_ust_client_lib_ring_buffer_client_cb *get_client_cb(
-		struct lttng_ust_lib_ring_buffer *buf,
-		struct lttng_ust_shm_handle *handle)
+		struct lttng_ust_lib_ring_buffer *buf __attribute__((unused)),
+		struct lttng_ust_lib_ring_buffer_channel *chan)
 {
-	struct channel *chan;
 	const struct lttng_ust_lib_ring_buffer_config *config;
 	struct lttng_ust_client_lib_ring_buffer_client_cb *client_cb;
 
-	chan = shmp(handle, buf->backend.chan);
-	if (!chan)
-		return NULL;
 	config = &chan->backend.config;
 	if (!config->cb_ptr)
 		return NULL;
@@ -1593,139 +1829,156 @@ int ustctl_get_timestamp_begin(struct ustctl_consumer_stream *stream,
 		uint64_t *timestamp_begin)
 {
 	struct lttng_ust_client_lib_ring_buffer_client_cb *client_cb;
+	struct lttng_ust_lib_ring_buffer_channel *chan;
 	struct lttng_ust_lib_ring_buffer *buf;
-	struct lttng_ust_shm_handle *handle;
 
 	if (!stream || !timestamp_begin)
 		return -EINVAL;
 	buf = stream->buf;
-	handle = stream->chan->chan->handle;
-	client_cb = get_client_cb(buf, handle);
+	chan = stream->chan->chan->priv->rb_chan;
+	client_cb = get_client_cb(buf, chan);
 	if (!client_cb)
 		return -ENOSYS;
-	return client_cb->timestamp_begin(buf, handle, timestamp_begin);
+	return client_cb->timestamp_begin(buf, chan, timestamp_begin);
 }
 
 int ustctl_get_timestamp_end(struct ustctl_consumer_stream *stream,
 	uint64_t *timestamp_end)
 {
 	struct lttng_ust_client_lib_ring_buffer_client_cb *client_cb;
+	struct lttng_ust_lib_ring_buffer_channel *chan;
 	struct lttng_ust_lib_ring_buffer *buf;
-	struct lttng_ust_shm_handle *handle;
 
 	if (!stream || !timestamp_end)
 		return -EINVAL;
 	buf = stream->buf;
-	handle = stream->chan->chan->handle;
-	client_cb = get_client_cb(buf, handle);
+	chan = stream->chan->chan->priv->rb_chan;
+	client_cb = get_client_cb(buf, chan);
 	if (!client_cb)
 		return -ENOSYS;
-	return client_cb->timestamp_end(buf, handle, timestamp_end);
+	return client_cb->timestamp_end(buf, chan, timestamp_end);
 }
 
 int ustctl_get_events_discarded(struct ustctl_consumer_stream *stream,
 	uint64_t *events_discarded)
 {
 	struct lttng_ust_client_lib_ring_buffer_client_cb *client_cb;
+	struct lttng_ust_lib_ring_buffer_channel *chan;
 	struct lttng_ust_lib_ring_buffer *buf;
-	struct lttng_ust_shm_handle *handle;
 
 	if (!stream || !events_discarded)
 		return -EINVAL;
 	buf = stream->buf;
-	handle = stream->chan->chan->handle;
-	client_cb = get_client_cb(buf, handle);
+	chan = stream->chan->chan->priv->rb_chan;
+	client_cb = get_client_cb(buf, chan);
 	if (!client_cb)
 		return -ENOSYS;
-	return client_cb->events_discarded(buf, handle, events_discarded);
+	return client_cb->events_discarded(buf, chan, events_discarded);
 }
 
 int ustctl_get_content_size(struct ustctl_consumer_stream *stream,
 	uint64_t *content_size)
 {
 	struct lttng_ust_client_lib_ring_buffer_client_cb *client_cb;
+	struct lttng_ust_lib_ring_buffer_channel *chan;
 	struct lttng_ust_lib_ring_buffer *buf;
-	struct lttng_ust_shm_handle *handle;
 
 	if (!stream || !content_size)
 		return -EINVAL;
 	buf = stream->buf;
-	handle = stream->chan->chan->handle;
-	client_cb = get_client_cb(buf, handle);
+	chan = stream->chan->chan->priv->rb_chan;
+	client_cb = get_client_cb(buf, chan);
 	if (!client_cb)
 		return -ENOSYS;
-	return client_cb->content_size(buf, handle, content_size);
+	return client_cb->content_size(buf, chan, content_size);
 }
 
 int ustctl_get_packet_size(struct ustctl_consumer_stream *stream,
 	uint64_t *packet_size)
 {
 	struct lttng_ust_client_lib_ring_buffer_client_cb *client_cb;
+	struct lttng_ust_lib_ring_buffer_channel *chan;
 	struct lttng_ust_lib_ring_buffer *buf;
-	struct lttng_ust_shm_handle *handle;
 
 	if (!stream || !packet_size)
 		return -EINVAL;
 	buf = stream->buf;
-	handle = stream->chan->chan->handle;
-	client_cb = get_client_cb(buf, handle);
+	chan = stream->chan->chan->priv->rb_chan;
+	client_cb = get_client_cb(buf, chan);
 	if (!client_cb)
 		return -ENOSYS;
-	return client_cb->packet_size(buf, handle, packet_size);
+	return client_cb->packet_size(buf, chan, packet_size);
 }
 
 int ustctl_get_stream_id(struct ustctl_consumer_stream *stream,
 		uint64_t *stream_id)
 {
 	struct lttng_ust_client_lib_ring_buffer_client_cb *client_cb;
+	struct lttng_ust_lib_ring_buffer_channel *chan;
 	struct lttng_ust_lib_ring_buffer *buf;
-	struct lttng_ust_shm_handle *handle;
 
 	if (!stream || !stream_id)
 		return -EINVAL;
 	buf = stream->buf;
-	handle = stream->chan->chan->handle;
-	client_cb = get_client_cb(buf, handle);
+	chan = stream->chan->chan->priv->rb_chan;
+	client_cb = get_client_cb(buf, chan);
 	if (!client_cb)
 		return -ENOSYS;
-	return client_cb->stream_id(buf, handle, stream_id);
+	return client_cb->stream_id(buf, chan, stream_id);
 }
 
 int ustctl_get_current_timestamp(struct ustctl_consumer_stream *stream,
 		uint64_t *ts)
 {
 	struct lttng_ust_client_lib_ring_buffer_client_cb *client_cb;
+	struct lttng_ust_lib_ring_buffer_channel *chan;
 	struct lttng_ust_lib_ring_buffer *buf;
-	struct lttng_ust_shm_handle *handle;
 
 	if (!stream || !ts)
 		return -EINVAL;
 	buf = stream->buf;
-	handle = stream->chan->chan->handle;
-	client_cb = get_client_cb(buf, handle);
+	chan = stream->chan->chan->priv->rb_chan;
+	client_cb = get_client_cb(buf, chan);
 	if (!client_cb || !client_cb->current_timestamp)
 		return -ENOSYS;
-	return client_cb->current_timestamp(buf, handle, ts);
+	return client_cb->current_timestamp(buf, chan, ts);
 }
 
 int ustctl_get_sequence_number(struct ustctl_consumer_stream *stream,
 		uint64_t *seq)
 {
 	struct lttng_ust_client_lib_ring_buffer_client_cb *client_cb;
+	struct lttng_ust_lib_ring_buffer_channel *chan;
 	struct lttng_ust_lib_ring_buffer *buf;
-	struct lttng_ust_shm_handle *handle;
 
 	if (!stream || !seq)
 		return -EINVAL;
 	buf = stream->buf;
-	handle = stream->chan->chan->handle;
-	client_cb = get_client_cb(buf, handle);
+	chan = stream->chan->chan->priv->rb_chan;
+	client_cb = get_client_cb(buf, chan);
 	if (!client_cb || !client_cb->sequence_number)
 		return -ENOSYS;
-	return client_cb->sequence_number(buf, handle, seq);
+	return client_cb->sequence_number(buf, chan, seq);
+}
+
+int ustctl_get_instance_id(struct ustctl_consumer_stream *stream,
+		uint64_t *id)
+{
+	struct lttng_ust_client_lib_ring_buffer_client_cb *client_cb;
+	struct lttng_ust_lib_ring_buffer_channel *chan;
+	struct lttng_ust_lib_ring_buffer *buf;
+
+	if (!stream || !id)
+		return -EINVAL;
+	buf = stream->buf;
+	chan = stream->chan->chan->priv->rb_chan;
+	client_cb = get_client_cb(buf, chan);
+	if (!client_cb)
+		return -ENOSYS;
+	return client_cb->instance_id(buf, chan, id);
 }
 
-#if defined(__x86_64__) || defined(__i386__)
+#ifdef HAVE_LINUX_PERF_EVENT_H
 
 int ustctl_has_perf_counters(void)
 {
@@ -1741,6 +1994,105 @@ int ustctl_has_perf_counters(void)
 
 #endif
 
+#ifdef __linux__
+/*
+ * Override application pid/uid/gid with unix socket credentials. If
+ * the application announced a pid matching our view, it means it is
+ * within the same pid namespace, so expose the ppid provided by the
+ * application.
+ */
+static
+int get_cred(int sock,
+	const struct ustctl_reg_msg *reg_msg,
+	uint32_t *pid,
+	uint32_t *ppid,
+	uint32_t *uid,
+	uint32_t *gid)
+{
+	struct ucred ucred;
+	socklen_t ucred_len = sizeof(struct ucred);
+	int ret;
+
+	ret = getsockopt(sock, SOL_SOCKET, SO_PEERCRED, &ucred, &ucred_len);
+	if (ret) {
+		return -LTTNG_UST_ERR_PEERCRED;
+	}
+	DBG("Unix socket peercred [ pid: %u, uid: %u, gid: %u ], "
+		"application registered claiming [ pid: %u, ppid: %u, uid: %u, gid: %u ]",
+		ucred.pid, ucred.uid, ucred.gid,
+		reg_msg->pid, reg_msg->ppid, reg_msg->uid, reg_msg->gid);
+	if (!ucred.pid) {
+		ERR("Unix socket credential pid=0. Refusing application in distinct, non-nested pid namespace.");
+		return -LTTNG_UST_ERR_PEERCRED_PID;
+	}
+	*pid = ucred.pid;
+	*uid = ucred.uid;
+	*gid = ucred.gid;
+	if (ucred.pid == reg_msg->pid) {
+		*ppid = reg_msg->ppid;
+	} else {
+		*ppid = 0;
+	}
+	return 0;
+}
+#elif defined(__FreeBSD__)
+#include <sys/ucred.h>
+#include <sys/un.h>
+
+/*
+ * Override application uid/gid with unix socket credentials. Use the
+ * first group of the cr_groups.
+ * Use the pid and ppid provided by the application on registration.
+ */
+static
+int get_cred(int sock,
+	const struct ustctl_reg_msg *reg_msg,
+	uint32_t *pid,
+	uint32_t *ppid,
+	uint32_t *uid,
+	uint32_t *gid)
+{
+	struct xucred xucred;
+	socklen_t xucred_len = sizeof(struct xucred);
+	int ret;
+
+	ret = getsockopt(sock, SOL_SOCKET, LOCAL_PEERCRED, &xucred, &xucred_len);
+	if (ret) {
+		return -LTTNG_UST_ERR_PEERCRED;
+	}
+	if (xucred.cr_version != XUCRED_VERSION || xucred.cr_ngroups < 1) {
+		return -LTTNG_UST_ERR_PEERCRED;
+	}
+	DBG("Unix socket peercred [ uid: %u, gid: %u ], "
+		"application registered claiming [ pid: %d, ppid: %d, uid: %u, gid: %u ]",
+		xucred.cr_uid, xucred.cr_groups[0],
+		reg_msg->pid, reg_msg->ppid, reg_msg->uid, reg_msg->gid);
+	*pid = reg_msg->pid;
+	*ppid = reg_msg->ppid;
+	*uid = xucred.cr_uid;
+	*gid = xucred.cr_groups[0];
+	return 0;
+}
+#else
+#warning "Using insecure fallback: trusting user id provided by registered applications. Please consider implementing use of unix socket credentials on your platform."
+static
+int get_cred(int sock,
+	const struct ustctl_reg_msg *reg_msg,
+	uint32_t *pid,
+	uint32_t *ppid,
+	uint32_t *uid,
+	uint32_t *gid)
+{
+	DBG("Application registered claiming [ pid: %u, ppid: %d, uid: %u, gid: %u ]",
+		reg_msg->pid, reg_msg->ppid, reg_msg->uid, reg_msg->gid);
+	*pid = reg_msg->pid;
+	*ppid = reg_msg->ppid;
+	*uid = reg_msg->uid;
+	*gid = reg_msg->gid;
+	return 0;
+}
+#endif
+
 /*
  * Returns 0 on success, negative error value on error.
  */
@@ -1772,10 +2124,10 @@ int ustctl_recv_reg_msg(int sock,
 	if (len < 0)
 		return len;
 
-	if (reg_msg.magic == LTTNG_UST_COMM_MAGIC) {
+	if (reg_msg.magic == LTTNG_UST_ABI_COMM_MAGIC) {
 		*byte_order = BYTE_ORDER == BIG_ENDIAN ?
 				BIG_ENDIAN : LITTLE_ENDIAN;
-	} else if (reg_msg.magic == bswap_32(LTTNG_UST_COMM_MAGIC)) {
+	} else if (reg_msg.magic == bswap_32(LTTNG_UST_ABI_COMM_MAGIC)) {
 		*byte_order = BYTE_ORDER == BIG_ENDIAN ?
 				LITTLE_ENDIAN : BIG_ENDIAN;
 	} else {
@@ -1791,10 +2143,6 @@ int ustctl_recv_reg_msg(int sock,
 	}
 	*major = reg_msg.major;
 	*minor = reg_msg.minor;
-	*pid = reg_msg.pid;
-	*ppid = reg_msg.ppid;
-	*uid = reg_msg.uid;
-	*gid = reg_msg.gid;
 	*bits_per_long = reg_msg.bits_per_long;
 	*uint8_t_alignment = reg_msg.uint8_t_alignment;
 	*uint16_t_alignment = reg_msg.uint16_t_alignment;
@@ -1802,11 +2150,11 @@ int ustctl_recv_reg_msg(int sock,
 	*uint64_t_alignment = reg_msg.uint64_t_alignment;
 	*long_alignment = reg_msg.long_alignment;
 	memcpy(name, reg_msg.name, LTTNG_UST_ABI_PROCNAME_LEN);
-	if (reg_msg.major != LTTNG_UST_ABI_MAJOR_VERSION) {
+	if (reg_msg.major < LTTNG_UST_ABI_MAJOR_VERSION_OLDEST_COMPATIBLE ||
+			reg_msg.major > LTTNG_UST_ABI_MAJOR_VERSION) {
 		return -LTTNG_UST_ERR_UNSUP_MAJOR;
 	}
-
-	return 0;
+	return get_cred(sock, &reg_msg, pid, ppid, uid, gid);
 }
 
 int ustctl_recv_notify(int sock, enum ustctl_notify_cmd *notify_cmd)
@@ -1866,8 +2214,8 @@ int ustctl_recv_register_event(int sock,
 
 	*session_objd = msg.session_objd;
 	*channel_objd = msg.channel_objd;
-	strncpy(event_name, msg.event_name, LTTNG_UST_SYM_NAME_LEN);
-	event_name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
+	strncpy(event_name, msg.event_name, LTTNG_UST_ABI_SYM_NAME_LEN);
+	event_name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
 	*loglevel = msg.loglevel;
 	signature_len = msg.signature_len;
 	fields_len = msg.fields_len;
@@ -2006,8 +2354,8 @@ int ustctl_recv_register_enum(int sock,
 		return len;
 
 	*session_objd = msg.session_objd;
-	strncpy(enum_name, msg.enum_name, LTTNG_UST_SYM_NAME_LEN);
-	enum_name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
+	strncpy(enum_name, msg.enum_name, LTTNG_UST_ABI_SYM_NAME_LEN);
+	enum_name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
 	entries_len = msg.entries_len;
 
 	if (entries_len % sizeof(*a_entries) != 0) {
@@ -2166,25 +2514,413 @@ int ustctl_reply_register_channel(int sock,
 	return 0;
 }
 
-static __attribute__((constructor))
+/* Regenerate the statedump. */
+int ustctl_regenerate_statedump(int sock, int handle)
+{
+	struct ustcomm_ust_msg lum;
+	struct ustcomm_ust_reply lur;
+	int ret;
+
+	memset(&lum, 0, sizeof(lum));
+	lum.handle = handle;
+	lum.cmd = LTTNG_UST_ABI_SESSION_STATEDUMP;
+	ret = ustcomm_send_app_cmd(sock, &lum, &lur);
+	if (ret)
+		return ret;
+	DBG("Regenerated statedump for handle %u", handle);
+	return 0;
+}
+
+/* counter operations */
+
+int ustctl_get_nr_cpu_per_counter(void)
+{
+	return lttng_counter_num_possible_cpus();
+}
+
+struct ustctl_daemon_counter *
+	ustctl_create_counter(size_t nr_dimensions,
+		const struct ustctl_counter_dimension *dimensions,
+		int64_t global_sum_step,
+		int global_counter_fd,
+		int nr_counter_cpu_fds,
+		const int *counter_cpu_fds,
+		enum ustctl_counter_bitness bitness,
+		enum ustctl_counter_arithmetic arithmetic,
+		uint32_t alloc_flags,
+		bool coalesce_hits)
+{
+	const char *transport_name;
+	struct ustctl_daemon_counter *counter;
+	struct lttng_counter_transport *transport;
+	struct lttng_counter_dimension ust_dim[LTTNG_COUNTER_DIMENSION_MAX];
+	size_t i;
+
+	if (nr_dimensions > LTTNG_COUNTER_DIMENSION_MAX)
+		return NULL;
+	/* Currently, only per-cpu allocation is supported. */
+	switch (alloc_flags) {
+	case USTCTL_COUNTER_ALLOC_PER_CPU:
+		break;
+
+	case USTCTL_COUNTER_ALLOC_PER_CPU | USTCTL_COUNTER_ALLOC_GLOBAL:
+	case USTCTL_COUNTER_ALLOC_GLOBAL:
+	default:
+		return NULL;
+	}
+	switch (bitness) {
+	case USTCTL_COUNTER_BITNESS_32:
+		switch (arithmetic) {
+		case USTCTL_COUNTER_ARITHMETIC_MODULAR:
+			transport_name = "counter-per-cpu-32-modular";
+			break;
+		case USTCTL_COUNTER_ARITHMETIC_SATURATION:
+			transport_name = "counter-per-cpu-32-saturation";
+			break;
+		default:
+			return NULL;
+		}
+		break;
+	case USTCTL_COUNTER_BITNESS_64:
+		switch (arithmetic) {
+		case USTCTL_COUNTER_ARITHMETIC_MODULAR:
+			transport_name = "counter-per-cpu-64-modular";
+			break;
+		case USTCTL_COUNTER_ARITHMETIC_SATURATION:
+			transport_name = "counter-per-cpu-64-saturation";
+			break;
+		default:
+			return NULL;
+		}
+		break;
+	default:
+		return NULL;
+	}
+
+	transport = lttng_counter_transport_find(transport_name);
+	if (!transport) {
+		DBG("LTTng transport %s not found\n",
+			transport_name);
+		return NULL;
+	}
+
+	counter = zmalloc(sizeof(*counter));
+	if (!counter)
+		return NULL;
+	counter->attr = zmalloc(sizeof(*counter->attr));
+	if (!counter->attr)
+		goto free_counter;
+	counter->attr->bitness = bitness;
+	counter->attr->arithmetic = arithmetic;
+	counter->attr->nr_dimensions = nr_dimensions;
+	counter->attr->global_sum_step = global_sum_step;
+	counter->attr->coalesce_hits = coalesce_hits;
+	for (i = 0; i < nr_dimensions; i++)
+		counter->attr->dimensions[i] = dimensions[i];
+
+	for (i = 0; i < nr_dimensions; i++) {
+		ust_dim[i].size = dimensions[i].size;
+		ust_dim[i].underflow_index = dimensions[i].underflow_index;
+		ust_dim[i].overflow_index = dimensions[i].overflow_index;
+		ust_dim[i].has_underflow = dimensions[i].has_underflow;
+		ust_dim[i].has_overflow = dimensions[i].has_overflow;
+	}
+	counter->counter = transport->ops.counter_create(nr_dimensions,
+		ust_dim, global_sum_step, global_counter_fd,
+		nr_counter_cpu_fds, counter_cpu_fds, true);
+	if (!counter->counter)
+		goto free_attr;
+	counter->ops = &transport->ops;
+	return counter;
+
+free_attr:
+	free(counter->attr);
+free_counter:
+	free(counter);
+	return NULL;
+}
+
+int ustctl_create_counter_data(struct ustctl_daemon_counter *counter,
+		struct lttng_ust_abi_object_data **_counter_data)
+{
+	struct lttng_ust_abi_object_data *counter_data;
+	struct lttng_ust_abi_counter_conf counter_conf = {0};
+	size_t i;
+	int ret;
+
+	switch (counter->attr->arithmetic) {
+	case USTCTL_COUNTER_ARITHMETIC_MODULAR:
+		counter_conf.arithmetic = LTTNG_UST_ABI_COUNTER_ARITHMETIC_MODULAR;
+		break;
+	case USTCTL_COUNTER_ARITHMETIC_SATURATION:
+		counter_conf.arithmetic = LTTNG_UST_ABI_COUNTER_ARITHMETIC_SATURATION;
+		break;
+	default:
+		return -EINVAL;
+	}
+	switch (counter->attr->bitness) {
+	case USTCTL_COUNTER_BITNESS_32:
+		counter_conf.bitness = LTTNG_UST_ABI_COUNTER_BITNESS_32;
+		break;
+	case USTCTL_COUNTER_BITNESS_64:
+		counter_conf.bitness = LTTNG_UST_ABI_COUNTER_BITNESS_64;
+		break;
+	default:
+		return -EINVAL;
+	}
+	counter_conf.number_dimensions = counter->attr->nr_dimensions;
+	counter_conf.global_sum_step = counter->attr->global_sum_step;
+	counter_conf.coalesce_hits = counter->attr->coalesce_hits;
+	for (i = 0; i < counter->attr->nr_dimensions; i++) {
+		counter_conf.dimensions[i].size = counter->attr->dimensions[i].size;
+		counter_conf.dimensions[i].underflow_index = counter->attr->dimensions[i].underflow_index;
+		counter_conf.dimensions[i].overflow_index = counter->attr->dimensions[i].overflow_index;
+		counter_conf.dimensions[i].has_underflow = counter->attr->dimensions[i].has_underflow;
+		counter_conf.dimensions[i].has_overflow = counter->attr->dimensions[i].has_overflow;
+	}
+
+	counter_data = zmalloc(sizeof(*counter_data));
+	if (!counter_data) {
+		ret = -ENOMEM;
+		goto error_alloc;
+	}
+	counter_data->type = LTTNG_UST_ABI_OBJECT_TYPE_COUNTER;
+	counter_data->handle = -1;
+
+	counter_data->size = sizeof(counter_conf);
+	counter_data->u.counter.data = zmalloc(sizeof(counter_conf));
+	if (!counter_data->u.counter.data) {
+		ret = -ENOMEM;
+		goto error_alloc_data;
+	}
+
+	memcpy(counter_data->u.counter.data, &counter_conf, sizeof(counter_conf));
+	*_counter_data = counter_data;
+
+	return 0;
+
+error_alloc_data:
+	free(counter_data);
+error_alloc:
+	return ret;
+}
+
+int ustctl_create_counter_global_data(struct ustctl_daemon_counter *counter,
+		struct lttng_ust_abi_object_data **_counter_global_data)
+{
+	struct lttng_ust_abi_object_data *counter_global_data;
+	int ret, fd;
+	size_t len;
+
+	if (lttng_counter_get_global_shm(counter->counter, &fd, &len))
+		return -EINVAL;
+	counter_global_data = zmalloc(sizeof(*counter_global_data));
+	if (!counter_global_data) {
+		ret = -ENOMEM;
+		goto error_alloc;
+	}
+	counter_global_data->type = LTTNG_UST_ABI_OBJECT_TYPE_COUNTER_GLOBAL;
+	counter_global_data->handle = -1;
+	counter_global_data->size = len;
+	counter_global_data->u.counter_global.shm_fd = fd;
+	*_counter_global_data = counter_global_data;
+	return 0;
+
+error_alloc:
+	return ret;
+}
+
+int ustctl_create_counter_cpu_data(struct ustctl_daemon_counter *counter, int cpu,
+		struct lttng_ust_abi_object_data **_counter_cpu_data)
+{
+	struct lttng_ust_abi_object_data *counter_cpu_data;
+	int ret, fd;
+	size_t len;
+
+	if (lttng_counter_get_cpu_shm(counter->counter, cpu, &fd, &len))
+		return -EINVAL;
+	counter_cpu_data = zmalloc(sizeof(*counter_cpu_data));
+	if (!counter_cpu_data) {
+		ret = -ENOMEM;
+		goto error_alloc;
+	}
+	counter_cpu_data->type = LTTNG_UST_ABI_OBJECT_TYPE_COUNTER_CPU;
+	counter_cpu_data->handle = -1;
+	counter_cpu_data->size = len;
+	counter_cpu_data->u.counter_cpu.shm_fd = fd;
+	counter_cpu_data->u.counter_cpu.cpu_nr = cpu;
+	*_counter_cpu_data = counter_cpu_data;
+	return 0;
+
+error_alloc:
+	return ret;
+}
+
+void ustctl_destroy_counter(struct ustctl_daemon_counter *counter)
+{
+	counter->ops->counter_destroy(counter->counter);
+	free(counter->attr);
+	free(counter);
+}
+
+int ustctl_send_counter_data_to_ust(int sock, int parent_handle,
+		struct lttng_ust_abi_object_data *counter_data)
+{
+	struct ustcomm_ust_msg lum;
+	struct ustcomm_ust_reply lur;
+	int ret;
+	size_t size;
+	ssize_t len;
+
+	if (!counter_data)
+		return -EINVAL;
+
+	size = counter_data->size;
+	memset(&lum, 0, sizeof(lum));
+	lum.handle = parent_handle;
+	lum.cmd = LTTNG_UST_ABI_COUNTER;
+	lum.u.counter.len = size;
+	ret = ustcomm_send_app_msg(sock, &lum);
+	if (ret)
+		return ret;
+
+	/* Send counter data */
+	len = ustcomm_send_unix_sock(sock, counter_data->u.counter.data, size);
+	if (len != size) {
+		if (len < 0)
+			return len;
+		else
+			return -EIO;
+	}
+
+	ret = ustcomm_recv_app_reply(sock, &lur, lum.handle, lum.cmd);
+	if (!ret) {
+		counter_data->handle = lur.ret_val;
+	}
+	return ret;
+}
+
+int ustctl_send_counter_global_data_to_ust(int sock,
+		struct lttng_ust_abi_object_data *counter_data,
+		struct lttng_ust_abi_object_data *counter_global_data)
+{
+	struct ustcomm_ust_msg lum;
+	struct ustcomm_ust_reply lur;
+	int ret, shm_fd[1];
+	size_t size;
+	ssize_t len;
+
+	if (!counter_data || !counter_global_data)
+		return -EINVAL;
+
+	size = counter_global_data->size;
+	memset(&lum, 0, sizeof(lum));
+	lum.handle = counter_data->handle;	/* parent handle */
+	lum.cmd = LTTNG_UST_ABI_COUNTER_GLOBAL;
+	lum.u.counter_global.len = size;
+	ret = ustcomm_send_app_msg(sock, &lum);
+	if (ret)
+		return ret;
+
+	shm_fd[0] = counter_global_data->u.counter_global.shm_fd;
+	len = ustcomm_send_fds_unix_sock(sock, shm_fd, 1);
+	if (len <= 0) {
+		if (len < 0)
+			return len;
+		else
+			return -EIO;
+	}
+
+	ret = ustcomm_recv_app_reply(sock, &lur, lum.handle, lum.cmd);
+	if (!ret) {
+		counter_global_data->handle = lur.ret_val;
+	}
+	return ret;
+}
+
+int ustctl_send_counter_cpu_data_to_ust(int sock,
+		struct lttng_ust_abi_object_data *counter_data,
+		struct lttng_ust_abi_object_data *counter_cpu_data)
+{
+	struct ustcomm_ust_msg lum;
+	struct ustcomm_ust_reply lur;
+	int ret, shm_fd[1];
+	size_t size;
+	ssize_t len;
+
+	if (!counter_data || !counter_cpu_data)
+		return -EINVAL;
+
+	size = counter_cpu_data->size;
+	memset(&lum, 0, sizeof(lum));
+	lum.handle = counter_data->handle;	/* parent handle */
+	lum.cmd = LTTNG_UST_ABI_COUNTER_CPU;
+	lum.u.counter_cpu.len = size;
+	lum.u.counter_cpu.cpu_nr = counter_cpu_data->u.counter_cpu.cpu_nr;
+	ret = ustcomm_send_app_msg(sock, &lum);
+	if (ret)
+		return ret;
+
+	shm_fd[0] = counter_cpu_data->u.counter_global.shm_fd;
+	len = ustcomm_send_fds_unix_sock(sock, shm_fd, 1);
+	if (len <= 0) {
+		if (len < 0)
+			return len;
+		else
+			return -EIO;
+	}
+
+	ret = ustcomm_recv_app_reply(sock, &lur, lum.handle, lum.cmd);
+	if (!ret) {
+		counter_cpu_data->handle = lur.ret_val;
+	}
+	return ret;
+}
+
+int ustctl_counter_read(struct ustctl_daemon_counter *counter,
+		const size_t *dimension_indexes,
+		int cpu, int64_t *value,
+		bool *overflow, bool *underflow)
+{
+	return counter->ops->counter_read(counter->counter, dimension_indexes, cpu,
+			value, overflow, underflow);
+}
+
+int ustctl_counter_aggregate(struct ustctl_daemon_counter *counter,
+		const size_t *dimension_indexes,
+		int64_t *value,
+		bool *overflow, bool *underflow)
+{
+	return counter->ops->counter_aggregate(counter->counter, dimension_indexes,
+			value, overflow, underflow);
+}
+
+int ustctl_counter_clear(struct ustctl_daemon_counter *counter,
+		const size_t *dimension_indexes)
+{
+	return counter->ops->counter_clear(counter->counter, dimension_indexes);
+}
+
+static
+void ustctl_init(void)
+	__attribute__((constructor));
+static
 void ustctl_init(void)
 {
-	init_usterr();
+	ust_err_init();
+	lttng_ust_getenv_init();	/* Needs ust_err_init() to be completed. */
 	lttng_ust_clock_init();
-	lttng_ring_buffer_metadata_client_init();
-	lttng_ring_buffer_client_overwrite_init();
-	lttng_ring_buffer_client_overwrite_rt_init();
-	lttng_ring_buffer_client_discard_init();
-	lttng_ring_buffer_client_discard_rt_init();
+	lttng_ust_ring_buffer_clients_init();
+	lttng_ust_counter_clients_init();
 	lib_ringbuffer_signal_init();
 }
 
-static __attribute__((destructor))
+static
+void ustctl_exit(void)
+	__attribute__((destructor));
+static
 void ustctl_exit(void)
 {
-	lttng_ring_buffer_client_discard_rt_exit();
-	lttng_ring_buffer_client_discard_exit();
-	lttng_ring_buffer_client_overwrite_rt_exit();
-	lttng_ring_buffer_client_overwrite_exit();
-	lttng_ring_buffer_metadata_client_exit();
+	lttng_ust_counter_clients_exit();
+	lttng_ust_ring_buffer_clients_exit();
 }