+++ /dev/null
-/*
- * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2 only,
- * as published by the Free Software Foundation.
- *
- * 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 <inttypes.h>
-#include <string.h>
-#include <unistd.h>
-
-#include <common/common.h>
-#include <common/defaults.h>
-#include <common/sessiond-comm/sessiond-comm.h>
-
-#include "channel.h"
-#include "lttng-sessiond.h"
-#include "kernel.h"
-#include "ust-ctl.h"
-#include "utils.h"
-#include "ust-app.h"
-
-/*
- * Return allocated channel attributes.
- */
-struct lttng_channel *channel_new_default_attr(int dom,
- enum lttng_buffer_type type)
-{
- struct lttng_channel *chan;
-
- chan = zmalloc(sizeof(struct lttng_channel));
- if (chan == NULL) {
- PERROR("zmalloc channel init");
- goto error_alloc;
- }
-
- if (snprintf(chan->name, sizeof(chan->name), "%s",
- DEFAULT_CHANNEL_NAME) < 0) {
- PERROR("snprintf default channel name");
- goto error;
- }
-
- /* Same for all domains. */
- chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
- chan->attr.tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE;
- chan->attr.tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT;
-
- switch (dom) {
- case LTTNG_DOMAIN_KERNEL:
- assert(type == LTTNG_BUFFER_GLOBAL);
- chan->attr.subbuf_size =
- default_get_kernel_channel_subbuf_size();
- chan->attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
- chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
- chan->attr.switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
- chan->attr.read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
- chan->attr.live_timer_interval = DEFAULT_KERNEL_CHANNEL_LIVE_TIMER;
- break;
- case LTTNG_DOMAIN_UST:
- switch (type) {
- case LTTNG_BUFFER_PER_UID:
- chan->attr.subbuf_size = default_get_ust_uid_channel_subbuf_size();
- chan->attr.num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM;
- chan->attr.output = DEFAULT_UST_UID_CHANNEL_OUTPUT;
- chan->attr.switch_timer_interval =
- DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
- chan->attr.read_timer_interval =
- DEFAULT_UST_UID_CHANNEL_READ_TIMER;
- chan->attr.live_timer_interval =
- DEFAULT_UST_UID_CHANNEL_LIVE_TIMER;
- break;
- case LTTNG_BUFFER_PER_PID:
- default:
- chan->attr.subbuf_size = default_get_ust_pid_channel_subbuf_size();
- chan->attr.num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM;
- chan->attr.output = DEFAULT_UST_PID_CHANNEL_OUTPUT;
- chan->attr.switch_timer_interval =
- DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
- chan->attr.read_timer_interval =
- DEFAULT_UST_PID_CHANNEL_READ_TIMER;
- chan->attr.live_timer_interval =
- DEFAULT_UST_UID_CHANNEL_LIVE_TIMER;
- break;
- }
- break;
- default:
- goto error; /* Not implemented */
- }
-
- return chan;
-
-error:
- free(chan);
-error_alloc:
- return NULL;
-}
-
-/*
- * Disable kernel channel of the kernel session.
- */
-int channel_kernel_disable(struct ltt_kernel_session *ksession,
- char *channel_name)
-{
- int ret;
- struct ltt_kernel_channel *kchan;
-
- assert(ksession);
- assert(channel_name);
-
- kchan = trace_kernel_get_channel_by_name(channel_name, ksession);
- if (kchan == NULL) {
- ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
- goto error;
- }
-
- /* Only if channel is enabled disable it. */
- if (kchan->enabled == 1) {
- ret = kernel_disable_channel(kchan);
- if (ret < 0 && ret != -EEXIST) {
- ret = LTTNG_ERR_KERN_CHAN_DISABLE_FAIL;
- goto error;
- }
- }
-
- ret = LTTNG_OK;
-
-error:
- return ret;
-}
-
-/*
- * Enable kernel channel of the kernel session.
- */
-int channel_kernel_enable(struct ltt_kernel_session *ksession,
- struct ltt_kernel_channel *kchan)
-{
- int ret;
-
- assert(ksession);
- assert(kchan);
-
- if (kchan->enabled == 0) {
- ret = kernel_enable_channel(kchan);
- if (ret < 0) {
- ret = LTTNG_ERR_KERN_CHAN_ENABLE_FAIL;
- goto error;
- }
- } else {
- ret = LTTNG_ERR_KERN_CHAN_EXIST;
- goto error;
- }
-
- ret = LTTNG_OK;
-
-error:
- return ret;
-}
-
-/*
- * Create kernel channel of the kernel session and notify kernel thread.
- */
-int channel_kernel_create(struct ltt_kernel_session *ksession,
- struct lttng_channel *attr, int kernel_pipe)
-{
- int ret;
- struct lttng_channel *defattr = NULL;
-
- assert(ksession);
-
- /* Creating channel attributes if needed */
- if (attr == NULL) {
- defattr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
- LTTNG_BUFFER_GLOBAL);
- if (defattr == NULL) {
- ret = LTTNG_ERR_FATAL;
- goto error;
- }
- attr = defattr;
- }
-
- if (ksession->snapshot_mode) {
- /* Force channel attribute for snapshot mode. */
- attr->attr.overwrite = 1;
- attr->attr.output = LTTNG_EVENT_MMAP;
- }
-
- /* Channel not found, creating it */
- ret = kernel_create_channel(ksession, attr);
- if (ret < 0) {
- ret = LTTNG_ERR_KERN_CHAN_FAIL;
- goto error;
- }
-
- /* Notify kernel thread that there is a new channel */
- ret = notify_thread_pipe(kernel_pipe);
- if (ret < 0) {
- ret = LTTNG_ERR_FATAL;
- goto error;
- }
-
- ret = LTTNG_OK;
-error:
- free(defattr);
- return ret;
-}
-
-/*
- * Enable UST channel for session and domain.
- */
-int channel_ust_enable(struct ltt_ust_session *usess,
- struct ltt_ust_channel *uchan)
-{
- int ret = LTTNG_OK;
-
- assert(usess);
- assert(uchan);
-
- /* If already enabled, everything is OK */
- if (uchan->enabled) {
- DBG3("Channel %s already enabled. Skipping", uchan->name);
- ret = LTTNG_ERR_UST_CHAN_EXIST;
- goto end;
- }
-
- DBG2("Channel %s being enabled in UST domain", uchan->name);
-
- /*
- * Enable channel for UST global domain on all applications. Ignore return
- * value here since whatever error we got, it means that the channel was
- * not created on one or many registered applications and we can not report
- * this to the user yet. However, at this stage, the channel was
- * successfully created on the session daemon side so the enable-channel
- * command is a success.
- */
- (void) ust_app_enable_channel_glb(usess, uchan);
-
- uchan->enabled = 1;
- DBG2("Channel %s enabled successfully", uchan->name);
-
-end:
- return ret;
-}
-
-/*
- * Create UST channel for session and domain.
- */
-int channel_ust_create(struct ltt_ust_session *usess,
- struct lttng_channel *attr, enum lttng_buffer_type type)
-{
- int ret = LTTNG_OK;
- struct ltt_ust_channel *uchan = NULL;
- struct lttng_channel *defattr = NULL;
-
- assert(usess);
-
- /* Creating channel attributes if needed */
- if (attr == NULL) {
- defattr = channel_new_default_attr(LTTNG_DOMAIN_UST, type);
- if (defattr == NULL) {
- ret = LTTNG_ERR_FATAL;
- goto error;
- }
- attr = defattr;
- }
-
- if (usess->snapshot_mode) {
- /* Force channel attribute for snapshot mode. */
- attr->attr.overwrite = 1;
- attr->attr.output = LTTNG_EVENT_MMAP;
- }
-
- /*
- * Validate UST buffer size and number of buffers: must both be power of 2
- * and nonzero. We validate right here for UST, because applications will
- * not report the error to the user (unlike kernel tracing).
- */
- if (!attr->attr.subbuf_size ||
- (attr->attr.subbuf_size & (attr->attr.subbuf_size - 1))) {
- ret = LTTNG_ERR_INVALID;
- goto error;
- }
-
- /*
- * Invalid subbuffer size if it's lower then the page size.
- */
- if (attr->attr.subbuf_size < page_size) {
- ret = LTTNG_ERR_INVALID;
- goto error;
- }
-
- if (!attr->attr.num_subbuf ||
- (attr->attr.num_subbuf & (attr->attr.num_subbuf - 1))) {
- ret = LTTNG_ERR_INVALID;
- goto error;
- }
-
- if (attr->attr.output != LTTNG_EVENT_MMAP) {
- ret = LTTNG_ERR_NOT_SUPPORTED;
- goto error;
- }
-
- /*
- * The tracefile_size should not be < to the subbuf_size, otherwise
- * we won't be able to write the packets on disk
- */
- if ((attr->attr.tracefile_size > 0) &&
- (attr->attr.tracefile_size < attr->attr.subbuf_size)) {
- ret = LTTNG_ERR_INVALID;
- goto error;
- }
-
- /* Validate buffer type. */
- switch (type) {
- case LTTNG_BUFFER_PER_PID:
- break;
- case LTTNG_BUFFER_PER_UID:
- break;
- default:
- ret = LTTNG_ERR_BUFFER_NOT_SUPPORTED;
- goto error;
- }
-
- /* Create UST channel */
- uchan = trace_ust_create_channel(attr);
- if (uchan == NULL) {
- ret = LTTNG_ERR_FATAL;
- goto error;
- }
- uchan->enabled = 1;
- if (trace_ust_is_max_id(usess->used_channel_id)) {
- ret = LTTNG_ERR_UST_CHAN_FAIL;
- goto error;
- }
- uchan->id = trace_ust_get_next_chan_id(usess);
-
- DBG2("Channel %s is being created for UST with buffer %d and id %" PRIu64,
- uchan->name, type, uchan->id);
-
- /* Flag session buffer type. */
- if (!usess->buffer_type_changed) {
- usess->buffer_type = type;
- usess->buffer_type_changed = 1;
- } else if (usess->buffer_type != type) {
- /* Buffer type was already set. Refuse to create channel. */
- ret = LTTNG_ERR_BUFFER_TYPE_MISMATCH;
- goto error_free_chan;
- }
-
- /* Enable channel for global domain */
- ret = ust_app_create_channel_glb(usess, uchan);
- if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) {
- ret = LTTNG_ERR_UST_CHAN_FAIL;
- goto error_free_chan;
- }
-
- /* Adding the channel to the channel hash table. */
- rcu_read_lock();
- lttng_ht_add_unique_str(usess->domain_global.channels, &uchan->node);
- rcu_read_unlock();
-
- DBG2("Channel %s created successfully", uchan->name);
-
- free(defattr);
- return LTTNG_OK;
-
-error_free_chan:
- /*
- * No need to remove the channel from the hash table because at this point
- * it was not added hence the direct call and no call_rcu().
- */
- trace_ust_destroy_channel(uchan);
-error:
- free(defattr);
- return ret;
-}
-
-/*
- * Disable UST channel for session and domain.
- */
-int channel_ust_disable(struct ltt_ust_session *usess,
- struct ltt_ust_channel *uchan)
-{
- int ret = LTTNG_OK;
-
- assert(usess);
- assert(uchan);
-
- /* Already disabled */
- if (uchan->enabled == 0) {
- DBG2("Channel UST %s already disabled", uchan->name);
- goto end;
- }
-
- DBG2("Channel %s being disabled in UST global domain", uchan->name);
- /* Disable channel for global domain */
- ret = ust_app_disable_channel_glb(usess, uchan);
- if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) {
- ret = LTTNG_ERR_UST_CHAN_DISABLE_FAIL;
- goto error;
- }
-
- uchan->enabled = 0;
-
- DBG2("Channel %s disabled successfully", uchan->name);
-
- return LTTNG_OK;
-
-end:
-error:
- return ret;
-}
projects / lttng-tools.git / blobdiff