+++ /dev/null
-/*
- * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
- * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * 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.
- */
-
-#define _GNU_SOURCE
-#include <string.h>
-#include <lttng/ust-ctl.h>
-#include <lttng/ust-abi.h>
-#include <lttng/ust-events.h>
-#include <sys/mman.h>
-
-#include <usterr-signal-safe.h>
-#include <ust-comm.h>
-
-#include "../libringbuffer/backend.h"
-#include "../libringbuffer/frontend.h"
-
-volatile enum ust_loglevel ust_loglevel;
-
-static
-void init_object(struct lttng_ust_object_data *data)
-{
- data->handle = -1;
- data->shm_fd = -1;
- data->wait_fd = -1;
- data->memory_map_size = 0;
-}
-
-int ustctl_release_handle(int sock, int handle)
-{
- struct ustcomm_ust_msg lum;
- struct ustcomm_ust_reply lur;
- int ret;
-
- if (sock >= 0) {
- memset(&lum, 0, sizeof(lum));
- lum.handle = handle;
- lum.cmd = LTTNG_UST_RELEASE;
- ret = ustcomm_send_app_cmd(sock, &lum, &lur);
- if (ret < 0) {
- return ret;
- }
- }
- return 0;
-}
-/*
- * 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 ret;
-
- if (!data)
- return -EINVAL;
-
- if (data->shm_fd >= 0) {
- ret = close(data->shm_fd);
- if (ret < 0) {
- return ret;
- }
- }
- if (data->wait_fd >= 0) {
- ret = close(data->wait_fd);
- if (ret < 0) {
- return ret;
- }
- }
- return ustctl_release_handle(sock, data->handle);
-}
-
-/*
- * Send registration done packet to the application.
- */
-int ustctl_register_done(int sock)
-{
- struct ustcomm_ust_msg lum;
- struct ustcomm_ust_reply lur;
- int ret;
-
- 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;
- ret = ustcomm_send_app_cmd(sock, &lum, &lur);
- if (ret)
- return ret;
- if (lur.ret_code != USTCOMM_OK) {
- DBG("Return code: %s", ustcomm_get_readable_code(lur.ret_code));
- goto error;
- }
- return 0;
-
-error:
- return -1;
-}
-
-/*
- * returns session handle.
- */
-int ustctl_create_session(int sock)
-{
- struct ustcomm_ust_msg lum;
- struct ustcomm_ust_reply lur;
- int ret, session_handle;
-
- /* Create session */
- memset(&lum, 0, sizeof(lum));
- lum.handle = LTTNG_UST_ROOT_HANDLE;
- lum.cmd = LTTNG_UST_SESSION;
- ret = ustcomm_send_app_cmd(sock, &lum, &lur);
- if (ret)
- return ret;
- session_handle = lur.ret_val;
- DBG("received session handle %u", session_handle);
- return session_handle;
-}
-
-/* open the metadata global channel */
-int ustctl_open_metadata(int sock, int session_handle,
- struct lttng_ust_channel_attr *chops,
- struct lttng_ust_object_data **_metadata_data)
-{
- struct ustcomm_ust_msg lum;
- struct ustcomm_ust_reply lur;
- struct lttng_ust_object_data *metadata_data;
- int ret, err = 0;
-
- if (!chops || !_metadata_data)
- return -EINVAL;
-
- metadata_data = malloc(sizeof(*metadata_data));
- if (!metadata_data)
- return -ENOMEM;
- init_object(metadata_data);
- /* Create metadata channel */
- memset(&lum, 0, sizeof(lum));
- lum.handle = session_handle;
- lum.cmd = LTTNG_UST_METADATA;
- lum.u.channel.overwrite = chops->overwrite;
- lum.u.channel.subbuf_size = chops->subbuf_size;
- lum.u.channel.num_subbuf = chops->num_subbuf;
- lum.u.channel.switch_timer_interval = chops->switch_timer_interval;
- lum.u.channel.read_timer_interval = chops->read_timer_interval;
- lum.u.channel.output = chops->output;
- ret = ustcomm_send_app_cmd(sock, &lum, &lur);
- if (ret) {
- free(metadata_data);
- return ret;
- }
- if (lur.ret_code != USTCOMM_OK) {
- free(metadata_data);
- return lur.ret_code;
- }
- metadata_data->handle = lur.ret_val;
- DBG("received metadata handle %u", metadata_data->handle);
- metadata_data->memory_map_size = lur.u.channel.memory_map_size;
- /* get shm fd */
- ret = ustcomm_recv_fd(sock);
- if (ret < 0)
- err = 1;
- else
- metadata_data->shm_fd = ret;
- /*
- * We need to get the second FD even if the first fails, because
- * libust expects us to read the two FDs.
- */
- /* get wait fd */
- ret = ustcomm_recv_fd(sock);
- if (ret < 0)
- err = 1;
- else
- metadata_data->wait_fd = ret;
- if (err)
- goto error;
- *_metadata_data = metadata_data;
- return 0;
-
-error:
- (void) ustctl_release_object(sock, metadata_data);
- free(metadata_data);
- return -EINVAL;
-}
-
-int ustctl_create_channel(int sock, int session_handle,
- struct lttng_ust_channel_attr *chops,
- struct lttng_ust_object_data **_channel_data)
-{
- struct ustcomm_ust_msg lum;
- struct ustcomm_ust_reply lur;
- struct lttng_ust_object_data *channel_data;
- int ret, err = 0;
-
- if (!chops || !_channel_data)
- return -EINVAL;
-
- channel_data = malloc(sizeof(*channel_data));
- if (!channel_data)
- return -ENOMEM;
- init_object(channel_data);
- /* Create metadata channel */
- memset(&lum, 0, sizeof(lum));
- lum.handle = session_handle;
- lum.cmd = LTTNG_UST_CHANNEL;
- lum.u.channel.overwrite = chops->overwrite;
- lum.u.channel.subbuf_size = chops->subbuf_size;
- lum.u.channel.num_subbuf = chops->num_subbuf;
- lum.u.channel.switch_timer_interval = chops->switch_timer_interval;
- lum.u.channel.read_timer_interval = chops->read_timer_interval;
- lum.u.channel.output = chops->output;
- ret = ustcomm_send_app_cmd(sock, &lum, &lur);
- if (ret) {
- free(channel_data);
- return ret;
- }
- if (lur.ret_code != USTCOMM_OK) {
- free(channel_data);
- return lur.ret_code;
- }
- channel_data->handle = lur.ret_val;
- DBG("received channel handle %u", channel_data->handle);
- channel_data->memory_map_size = lur.u.channel.memory_map_size;
- /* get shm fd */
- ret = ustcomm_recv_fd(sock);
- if (ret < 0)
- err = 1;
- else
- channel_data->shm_fd = ret;
- /*
- * We need to get the second FD even if the first fails, because
- * libust expects us to read the two FDs.
- */
- /* get wait fd */
- ret = ustcomm_recv_fd(sock);
- if (ret < 0)
- err = 1;
- else
- channel_data->wait_fd = ret;
- if (err)
- goto error;
- *_channel_data = channel_data;
- return 0;
-
-error:
- (void) ustctl_release_object(sock, channel_data);
- free(channel_data);
- return -EINVAL;
-}
-
-/*
- * Return -ENOENT if no more stream is available for creation.
- * Return 0 on success.
- * Return negative error value on error.
- */
-int ustctl_create_stream(int sock, struct lttng_ust_object_data *channel_data,
- struct lttng_ust_object_data **_stream_data)
-{
- struct ustcomm_ust_msg lum;
- struct ustcomm_ust_reply lur;
- struct lttng_ust_object_data *stream_data;
- int ret, fd, err = 0;
-
- if (!channel_data || !_stream_data)
- return -EINVAL;
-
- stream_data = malloc(sizeof(*stream_data));
- if (!stream_data)
- return -ENOMEM;
- init_object(stream_data);
- memset(&lum, 0, sizeof(lum));
- lum.handle = channel_data->handle;
- lum.cmd = LTTNG_UST_STREAM;
- ret = ustcomm_send_app_cmd(sock, &lum, &lur);
- if (ret) {
- free(stream_data);
- return ret;
- }
- if (lur.ret_code != USTCOMM_OK) {
- free(stream_data);
- return lur.ret_code;
- }
-
- stream_data->handle = lur.ret_val;
- DBG("received stream handle %u", stream_data->handle);
- stream_data->memory_map_size = lur.u.stream.memory_map_size;
- /* get shm fd */
- fd = ustcomm_recv_fd(sock);
- if (fd < 0)
- err = 1;
- else
- stream_data->shm_fd = fd;
- /*
- * We need to get the second FD even if the first fails, because
- * libust expects us to read the two FDs.
- */
- /* get wait fd */
- fd = ustcomm_recv_fd(sock);
- if (fd < 0)
- err = 1;
- else
- stream_data->wait_fd = fd;
- if (err)
- goto error;
- *_stream_data = stream_data;
- return ret;
-
-error:
- (void) ustctl_release_object(sock, stream_data);
- free(stream_data);
- return -EINVAL;
-}
-
-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)
-{
- struct ustcomm_ust_msg lum;
- struct ustcomm_ust_reply lur;
- struct lttng_ust_object_data *event_data;
- int ret;
-
- if (!channel_data || !_event_data)
- return -EINVAL;
-
- event_data = malloc(sizeof(*event_data));
- if (!event_data)
- return -ENOMEM;
- init_object(event_data);
- memset(&lum, 0, sizeof(lum));
- lum.handle = channel_data->handle;
- lum.cmd = LTTNG_UST_EVENT;
- strncpy(lum.u.event.name, ev->name,
- LTTNG_UST_SYM_NAME_LEN);
- lum.u.event.instrumentation = ev->instrumentation;
- lum.u.event.loglevel_type = ev->loglevel_type;
- lum.u.event.loglevel = ev->loglevel;
- ret = ustcomm_send_app_cmd(sock, &lum, &lur);
- if (ret) {
- free(event_data);
- return ret;
- }
- event_data->handle = lur.ret_val;
- DBG("received event handle %u", event_data->handle);
- *_event_data = event_data;
- return 0;
-}
-
-int ustctl_add_context(int sock, struct lttng_ust_context *ctx,
- struct lttng_ust_object_data *obj_data,
- struct lttng_ust_object_data **_context_data)
-{
- struct ustcomm_ust_msg lum;
- struct ustcomm_ust_reply lur;
- struct lttng_ust_object_data *context_data;
- int ret;
-
- if (!obj_data || !_context_data)
- return -EINVAL;
-
- context_data = malloc(sizeof(*context_data));
- if (!context_data)
- return -ENOMEM;
- init_object(context_data);
- memset(&lum, 0, sizeof(lum));
- lum.handle = obj_data->handle;
- lum.cmd = LTTNG_UST_CONTEXT;
- lum.u.context.ctx = ctx->ctx;
- ret = ustcomm_send_app_cmd(sock, &lum, &lur);
- if (ret) {
- free(context_data);
- return ret;
- }
- context_data->handle = lur.ret_val;
- DBG("received context handle %u", context_data->handle);
- *_context_data = context_data;
- return ret;
-}
-
-/* Enable event, channel and session ioctl */
-int ustctl_enable(int sock, struct lttng_ust_object_data *object)
-{
- struct ustcomm_ust_msg lum;
- struct ustcomm_ust_reply lur;
- int ret;
-
- if (!object)
- return -EINVAL;
-
- memset(&lum, 0, sizeof(lum));
- lum.handle = object->handle;
- lum.cmd = LTTNG_UST_ENABLE;
- ret = ustcomm_send_app_cmd(sock, &lum, &lur);
- if (ret)
- return ret;
- DBG("enabled handle %u", object->handle);
- return 0;
-}
-
-/* Disable event, channel and session ioctl */
-int ustctl_disable(int sock, struct lttng_ust_object_data *object)
-{
- struct ustcomm_ust_msg lum;
- struct ustcomm_ust_reply lur;
- int ret;
-
- if (!object)
- return -EINVAL;
-
- memset(&lum, 0, sizeof(lum));
- lum.handle = object->handle;
- lum.cmd = LTTNG_UST_DISABLE;
- ret = ustcomm_send_app_cmd(sock, &lum, &lur);
- if (ret)
- return ret;
- DBG("disable handle %u", object->handle);
- return 0;
-}
-
-int ustctl_start_session(int sock, int handle)
-{
- struct lttng_ust_object_data obj;
-
- obj.handle = handle;
- return ustctl_enable(sock, &obj);
-}
-
-int ustctl_stop_session(int sock, int handle)
-{
- struct lttng_ust_object_data obj;
-
- obj.handle = handle;
- return ustctl_disable(sock, &obj);
-}
-
-int ustctl_tracepoint_list(int sock)
-{
- struct ustcomm_ust_msg lum;
- struct ustcomm_ust_reply lur;
- int ret, tp_list_handle;
-
- memset(&lum, 0, sizeof(lum));
- lum.handle = LTTNG_UST_ROOT_HANDLE;
- lum.cmd = LTTNG_UST_TRACEPOINT_LIST;
- ret = ustcomm_send_app_cmd(sock, &lum, &lur);
- if (ret)
- return ret;
- tp_list_handle = lur.ret_val;
- DBG("received tracepoint list handle %u", tp_list_handle);
- return tp_list_handle;
-}
-
-int ustctl_tracepoint_list_get(int sock, int tp_list_handle,
- struct lttng_ust_tracepoint_iter *iter)
-{
- struct ustcomm_ust_msg lum;
- struct ustcomm_ust_reply lur;
- int ret;
-
- if (!iter)
- return -EINVAL;
-
- memset(&lum, 0, sizeof(lum));
- lum.handle = tp_list_handle;
- lum.cmd = LTTNG_UST_TRACEPOINT_LIST_GET;
- ret = ustcomm_send_app_cmd(sock, &lum, &lur);
- if (ret)
- return ret;
- DBG("received tracepoint list entry name %s loglevel %d",
- lur.u.tracepoint.name,
- lur.u.tracepoint.loglevel);
- memcpy(iter, &lur.u.tracepoint, sizeof(*iter));
- return 0;
-}
-
-int ustctl_tracepoint_field_list(int sock)
-{
- struct ustcomm_ust_msg lum;
- struct ustcomm_ust_reply lur;
- int ret, tp_field_list_handle;
-
- memset(&lum, 0, sizeof(lum));
- lum.handle = LTTNG_UST_ROOT_HANDLE;
- lum.cmd = LTTNG_UST_TRACEPOINT_FIELD_LIST;
- ret = ustcomm_send_app_cmd(sock, &lum, &lur);
- if (ret)
- return ret;
- tp_field_list_handle = lur.ret_val;
- DBG("received tracepoint field list handle %u", tp_field_list_handle);
- return tp_field_list_handle;
-}
-
-int ustctl_tracepoint_field_list_get(int sock, int tp_field_list_handle,
- struct lttng_ust_field_iter *iter)
-{
- struct ustcomm_ust_msg lum;
- struct ustcomm_ust_reply lur;
- int ret;
- ssize_t len;
-
- if (!iter)
- return -EINVAL;
-
- memset(&lum, 0, sizeof(lum));
- lum.handle = tp_field_list_handle;
- lum.cmd = LTTNG_UST_TRACEPOINT_FIELD_LIST_GET;
- ret = ustcomm_send_app_cmd(sock, &lum, &lur);
- if (ret)
- return ret;
- len = ustcomm_recv_unix_sock(sock, iter, sizeof(*iter));
- if (len != sizeof(*iter)) {
- return -EINVAL;
- }
- DBG("received tracepoint field list entry event_name %s event_loglevel %d field_name %s field_type %d",
- iter->event_name,
- iter->loglevel,
- iter->field_name,
- iter->type);
- return 0;
-}
-
-int ustctl_tracer_version(int sock, struct lttng_ust_tracer_version *v)
-{
- struct ustcomm_ust_msg lum;
- struct ustcomm_ust_reply lur;
- int ret;
-
- if (!v)
- return -EINVAL;
-
- memset(&lum, 0, sizeof(lum));
- lum.handle = LTTNG_UST_ROOT_HANDLE;
- lum.cmd = LTTNG_UST_TRACER_VERSION;
- ret = ustcomm_send_app_cmd(sock, &lum, &lur);
- if (ret)
- return ret;
- memcpy(v, &lur.u.version, sizeof(*v));
- DBG("received tracer version");
- return 0;
-}
-
-int ustctl_wait_quiescent(int sock)
-{
- struct ustcomm_ust_msg lum;
- struct ustcomm_ust_reply lur;
- int ret;
-
- memset(&lum, 0, sizeof(lum));
- lum.handle = LTTNG_UST_ROOT_HANDLE;
- lum.cmd = LTTNG_UST_WAIT_QUIESCENT;
- ret = ustcomm_send_app_cmd(sock, &lum, &lur);
- if (ret)
- return ret;
- DBG("waited for quiescent state");
- return 0;
-}
-
-int ustctl_calibrate(int sock, struct lttng_ust_calibrate *calibrate)
-{
- if (!calibrate)
- return -EINVAL;
-
- return -ENOSYS;
-}
-
-int ustctl_sock_flush_buffer(int sock, struct lttng_ust_object_data *object)
-{
- struct ustcomm_ust_msg lum;
- struct ustcomm_ust_reply lur;
- int ret;
-
- if (!object)
- return -EINVAL;
-
- memset(&lum, 0, sizeof(lum));
- lum.handle = object->handle;
- lum.cmd = LTTNG_UST_FLUSH_BUFFER;
- ret = ustcomm_send_app_cmd(sock, &lum, &lur);
- if (ret)
- return ret;
- DBG("flushed buffer handle %u", object->handle);
- return 0;
-}
-
-/* Buffer operations */
-
-/* Map channel shm into process memory */
-struct lttng_ust_shm_handle *ustctl_map_channel(struct lttng_ust_object_data *chan_data)
-{
- struct lttng_ust_shm_handle *handle;
- struct channel *chan;
- size_t chan_size;
- struct lttng_ust_lib_ring_buffer_config *config;
- int ret;
-
- if (!chan_data)
- return NULL;
-
- handle = channel_handle_create(chan_data->shm_fd,
- chan_data->wait_fd,
- chan_data->memory_map_size);
- if (!handle) {
- ERR("create handle error");
- return NULL;
- }
- /*
- * Set to -1, and then close the shm fd, and set the handle shm
- * fd to -1 too. We don't need the shm fds after they have been
- * mapped.
- * The wait_fd is set to -1 in chan_data because it is now owned
- * by the handle.
- */
- chan_data->shm_fd = -1;
- chan_data->wait_fd = -1;
-
- /* chan is object 0. This is hardcoded. */
- if (handle->table->objects[0].shm_fd >= 0) {
- ret = close(handle->table->objects[0].shm_fd);
- if (ret) {
- perror("Error closing shm_fd");
- }
- handle->table->objects[0].shm_fd = -1;
- }
-
- /*
- * TODO: add consistency checks to be resilient if the
- * application try to feed us with incoherent channel structure
- * values.
- */
- chan = shmp(handle, handle->chan);
- /* chan is object 0. This is hardcoded. */
- chan_size = handle->table->objects[0].allocated_len;
- handle->shadow_chan = malloc(chan_size);
- if (!handle->shadow_chan) {
- channel_destroy(chan, handle, 1);
- return NULL;
- }
- memcpy(handle->shadow_chan, chan, chan_size);
- /*
- * The callback pointers in the producer are invalid in the
- * consumer. We need to look them up here.
- */
- config = &handle->shadow_chan->backend.config;
- switch (config->client_type) {
- case LTTNG_CLIENT_METADATA:
- memcpy(&config->cb, lttng_client_callbacks_metadata,
- sizeof(config->cb));
- break;
- case LTTNG_CLIENT_DISCARD:
- memcpy(&config->cb, lttng_client_callbacks_discard,
- sizeof(config->cb));
- break;
- case LTTNG_CLIENT_OVERWRITE:
- memcpy(&config->cb, lttng_client_callbacks_overwrite,
- sizeof(config->cb));
- break;
- default:
- ERR("Unknown client type %d", config->client_type);
- channel_destroy(chan, handle, 1);
- return NULL;
- }
- /* Replace the object table pointer. */
- ret = munmap(handle->table->objects[0].memory_map,
- handle->table->objects[0].memory_map_size);
- if (ret) {
- perror("munmap");
- assert(0);
- }
- handle->table->objects[0].memory_map = (char *) handle->shadow_chan;
- handle->table->objects[0].is_shadow = 1;
- return handle;
-}
-
-/* Add stream to channel shm and map its shm into process memory */
-int ustctl_add_stream(struct lttng_ust_shm_handle *handle,
- struct lttng_ust_object_data *stream_data)
-{
- int ret;
-
- if (!handle || !stream_data)
- return -EINVAL;
-
- if (!stream_data->handle)
- return -ENOENT;
- /* map stream */
- ret = channel_handle_add_stream(handle,
- stream_data->shm_fd,
- stream_data->wait_fd,
- stream_data->memory_map_size);
- if (ret) {
- ERR("add stream error\n");
- return ret;
- }
- /*
- * Set to -1 because the lttng_ust_shm_handle destruction will take care
- * of closing shm_fd and wait_fd.
- */
- stream_data->shm_fd = -1;
- stream_data->wait_fd = -1;
- return 0;
-}
-
-void ustctl_unmap_channel(struct lttng_ust_shm_handle *handle)
-{
- struct channel *chan;
-
- assert(handle);
- chan = shmp(handle, handle->chan);
- channel_destroy(chan, handle, 1);
-}
-
-/*
- * ustctl closes the shm_fd fds after mapping it.
- */
-struct lttng_ust_lib_ring_buffer *ustctl_open_stream_read(struct lttng_ust_shm_handle *handle,
- int cpu)
-{
- struct channel *chan = handle->shadow_chan;
- int *shm_fd, *wait_fd;
- uint64_t *memory_map_size;
- struct lttng_ust_lib_ring_buffer *buf;
- int ret;
-
- if (!handle)
- return NULL;
-
- buf = channel_get_ring_buffer(&chan->backend.config,
- chan, cpu, handle, &shm_fd, &wait_fd, &memory_map_size);
- if (!buf)
- return NULL;
- ret = lib_ring_buffer_open_read(buf, handle, 1);
- if (ret)
- return NULL;
- /*
- * We can close shm_fd early, right after is has been mapped.
- */
- if (*shm_fd >= 0) {
- ret = close(*shm_fd);
- if (ret) {
- perror("Error closing shm_fd");
- }
- *shm_fd = -1;
- }
- return buf;
-}
-
-void ustctl_close_stream_read(struct lttng_ust_shm_handle *handle,
- struct lttng_ust_lib_ring_buffer *buf)
-{
- assert(handle && buf);
- lib_ring_buffer_release_read(buf, handle, 1);
-}
-
-/* For mmap mode, readable without "get" operation */
-
-void *ustctl_get_mmap_base(struct lttng_ust_shm_handle *handle,
- struct lttng_ust_lib_ring_buffer *buf)
-{
- if (!handle || !buf)
- return NULL;
- return shmp(handle, buf->backend.memory_map);
-}
-
-/* returns the length to mmap. */
-int ustctl_get_mmap_len(struct lttng_ust_shm_handle *handle,
- struct lttng_ust_lib_ring_buffer *buf,
- unsigned long *len)
-{
- unsigned long mmap_buf_len;
- struct channel *chan = handle->shadow_chan;
-
- if (!handle || !buf || !len)
- return -EINVAL;
-
- if (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;
- if (mmap_buf_len > INT_MAX)
- return -EFBIG;
- *len = mmap_buf_len;
- return 0;
-}
-
-/* returns the maximum size for sub-buffers. */
-int ustctl_get_max_subbuf_size(struct lttng_ust_shm_handle *handle,
- struct lttng_ust_lib_ring_buffer *buf,
- unsigned long *len)
-{
- struct channel *chan = handle->shadow_chan;
-
- if (!handle || !buf || !len)
- return -EINVAL;
-
- *len = chan->backend.subbuf_size;
- return 0;
-}
-
-/*
- * For mmap mode, operate on the current packet (between get/put or
- * get_next/put_next).
- */
-
-/* returns the offset of the subbuffer belonging to the mmap reader. */
-int ustctl_get_mmap_read_offset(struct lttng_ust_shm_handle *handle,
- struct lttng_ust_lib_ring_buffer *buf, unsigned long *off)
-{
- struct channel *chan = handle->shadow_chan;
- unsigned long sb_bindex;
-
- if (!handle || !buf || !off)
- return -EINVAL;
-
- if (chan->backend.config.output != RING_BUFFER_MMAP)
- return -EINVAL;
- sb_bindex = subbuffer_id_get_index(&chan->backend.config,
- buf->backend.buf_rsb.id);
- *off = shmp(handle, shmp_index(handle, buf->backend.array, sb_bindex)->shmp)->mmap_offset;
- return 0;
-}
-
-/* returns the size of the current sub-buffer, without padding (for mmap). */
-int ustctl_get_subbuf_size(struct lttng_ust_shm_handle *handle,
- struct lttng_ust_lib_ring_buffer *buf, unsigned long *len)
-{
- struct channel *chan = handle->shadow_chan;
-
- if (!handle || !buf || !len)
- return -EINVAL;
-
- *len = lib_ring_buffer_get_read_data_size(&chan->backend.config, buf,
- handle);
- return 0;
-}
-
-/* returns the size of the current sub-buffer, without padding (for mmap). */
-int ustctl_get_padded_subbuf_size(struct lttng_ust_shm_handle *handle,
- struct lttng_ust_lib_ring_buffer *buf, unsigned long *len)
-{
- struct channel *chan = handle->shadow_chan;
-
- if (!handle || !buf || !len)
- return -EINVAL;
-
- *len = lib_ring_buffer_get_read_data_size(&chan->backend.config, buf,
- handle);
- *len = PAGE_ALIGN(*len);
- return 0;
-}
-
-/* Get exclusive read access to the next sub-buffer that can be read. */
-int ustctl_get_next_subbuf(struct lttng_ust_shm_handle *handle,
- struct lttng_ust_lib_ring_buffer *buf)
-{
- if (!handle || !buf)
- return -EINVAL;
-
- return lib_ring_buffer_get_next_subbuf(buf, handle);
-}
-
-
-/* Release exclusive sub-buffer access, move consumer forward. */
-int ustctl_put_next_subbuf(struct lttng_ust_shm_handle *handle,
- struct lttng_ust_lib_ring_buffer *buf)
-{
- if (!handle || !buf)
- return -EINVAL;
-
- lib_ring_buffer_put_next_subbuf(buf, handle);
- return 0;
-}
-
-/* snapshot */
-
-/* Get a snapshot of the current ring buffer producer and consumer positions */
-int ustctl_snapshot(struct lttng_ust_shm_handle *handle,
- struct lttng_ust_lib_ring_buffer *buf)
-{
- if (!handle || !buf)
- return -EINVAL;
-
- return lib_ring_buffer_snapshot(buf, &buf->cons_snapshot,
- &buf->prod_snapshot, handle);
-}
-
-/* Get the consumer position (iteration start) */
-int ustctl_snapshot_get_consumed(struct lttng_ust_shm_handle *handle,
- struct lttng_ust_lib_ring_buffer *buf, unsigned long *pos)
-{
- if (!handle || !buf || !pos)
- return -EINVAL;
-
- *pos = buf->cons_snapshot;
- return 0;
-}
-
-/* Get the producer position (iteration end) */
-int ustctl_snapshot_get_produced(struct lttng_ust_shm_handle *handle,
- struct lttng_ust_lib_ring_buffer *buf, unsigned long *pos)
-{
- if (!handle || !buf || !pos)
- return -EINVAL;
-
- *pos = buf->prod_snapshot;
- return 0;
-}
-
-/* Get exclusive read access to the specified sub-buffer position */
-int ustctl_get_subbuf(struct lttng_ust_shm_handle *handle,
- struct lttng_ust_lib_ring_buffer *buf, unsigned long *pos)
-{
- if (!handle || !buf || !pos)
- return -EINVAL;
-
- return lib_ring_buffer_get_subbuf(buf, *pos, handle);
-}
-
-/* Release exclusive sub-buffer access */
-int ustctl_put_subbuf(struct lttng_ust_shm_handle *handle,
- struct lttng_ust_lib_ring_buffer *buf)
-{
- if (!handle || !buf)
- return -EINVAL;
-
- lib_ring_buffer_put_subbuf(buf, handle);
- return 0;
-}
-
-void ustctl_flush_buffer(struct lttng_ust_shm_handle *handle,
- struct lttng_ust_lib_ring_buffer *buf,
- int producer_active)
-{
- assert(handle && buf);
- lib_ring_buffer_switch_slow(buf,
- producer_active ? SWITCH_ACTIVE : SWITCH_FLUSH,
- handle);
-}
projects / lttng-ust.git / blobdiff