+++ /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 as published by the Free
- * Software Foundation; only version 2 of the License.
- *
- * 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., 59 Temple
- * Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
-#define _GNU_SOURCE
-#include <string.h>
-#include <unistd.h>
-
-#include <lttng/lttng.h>
-#include <lttng-ht.h>
-#include <lttng-sessiond-comm.h>
-#include <lttngerr.h>
-
-#include "channel.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)
-{
- 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;
- }
-
- chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
- chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
- chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
-
- switch (dom) {
- case LTTNG_DOMAIN_KERNEL:
- chan->attr.subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE;
- chan->attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
- chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
- break;
- case LTTNG_DOMAIN_UST:
- case LTTNG_DOMAIN_UST_PID:
- chan->attr.subbuf_size = DEFAULT_UST_CHANNEL_SUBBUF_SIZE;
- chan->attr.num_subbuf = DEFAULT_UST_CHANNEL_SUBBUF_NUM;
- chan->attr.output = DEFAULT_UST_CHANNEL_OUTPUT;
- 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;
-
- kchan = trace_kernel_get_channel_by_name(channel_name, ksession);
- if (kchan == NULL) {
- ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
- goto error;
- } else if (kchan->enabled == 1) {
- ret = kernel_disable_channel(kchan);
- if (ret < 0 && ret != -EEXIST) {
- ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL;
- goto error;
- }
- }
-
- ret = LTTCOMM_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;
-
- if (kchan->enabled == 0) {
- ret = kernel_enable_channel(kchan);
- if (ret < 0) {
- ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL;
- goto error;
- }
- }
-
- ret = LTTCOMM_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;
-
- /* Creating channel attributes if needed */
- if (attr == NULL) {
- defattr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL);
- if (defattr == NULL) {
- ret = LTTCOMM_FATAL;
- goto error;
- }
- attr = defattr;
- }
-
- /* Channel not found, creating it */
- ret = kernel_create_channel(ksession, attr, ksession->trace_path);
- if (ret < 0) {
- ret = LTTCOMM_KERN_CHAN_FAIL;
- goto error;
- }
-
- /* Notify kernel thread that there is a new channel */
- ret = notify_thread_pipe(kernel_pipe);
- if (ret < 0) {
- ret = LTTCOMM_FATAL;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-error:
- free(defattr);
- return ret;
-}
-
-/*
- * Enable UST channel for session and domain.
- */
-int channel_ust_enable(struct ltt_ust_session *usess, int domain,
- struct ltt_ust_channel *uchan)
-{
- int ret = LTTCOMM_OK;
-
- /* If already enabled, everything is OK */
- if (uchan->enabled) {
- DBG3("Channel %s already enabled. Skipping", uchan->name);
- goto end;
- }
-
- switch (domain) {
- case LTTNG_DOMAIN_UST:
- DBG2("Channel %s being enabled in UST global domain", uchan->name);
- /* Enable channel for global domain */
- ret = ust_app_enable_channel_glb(usess, uchan);
- break;
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- ret = LTTCOMM_NOT_IMPLEMENTED;
- goto error;
- }
-
- if (ret < 0) {
- if (ret != -EEXIST) {
- ret = LTTCOMM_UST_CHAN_ENABLE_FAIL;
- goto error;
- } else {
- ret = LTTCOMM_OK;
- }
- }
-
- uchan->enabled = 1;
- DBG2("Channel %s enabled successfully", uchan->name);
-
-end:
-error:
- return ret;
-}
-
-/*
- * Create UST channel for session and domain.
- */
-int channel_ust_create(struct ltt_ust_session *usess, int domain,
- struct lttng_channel *attr)
-{
- int ret = LTTCOMM_OK;
- struct ltt_ust_channel *uchan = NULL;
- struct lttng_channel *defattr = NULL;
-
- /* Creating channel attributes if needed */
- if (attr == NULL) {
- defattr = channel_new_default_attr(domain);
- if (defattr == NULL) {
- ret = LTTCOMM_FATAL;
- goto error;
- }
- attr = defattr;
- }
-
- /* Create UST channel */
- uchan = trace_ust_create_channel(attr, usess->pathname);
- if (uchan == NULL) {
- ret = LTTCOMM_FATAL;
- goto error;
- }
- uchan->enabled = 1;
-
- switch (domain) {
- case LTTNG_DOMAIN_UST:
- DBG2("Channel %s being created in UST global domain", uchan->name);
-
- /* Enable channel for global domain */
- ret = ust_app_create_channel_glb(usess, uchan);
- break;
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- default:
- ret = LTTCOMM_NOT_IMPLEMENTED;
- goto error_free_chan;
- }
-
- if (ret < 0 && ret != -EEXIST) {
- ret = LTTCOMM_UST_CHAN_ENABLE_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 LTTCOMM_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, int domain,
- struct ltt_ust_channel *uchan)
-{
- int ret = LTTCOMM_OK;
-
- /* Already disabled */
- if (uchan->enabled == 0) {
- DBG2("Channel UST %s already disabled", uchan->name);
- goto end;
- }
-
- /* Get the right channel's hashtable */
- switch (domain) {
- case LTTNG_DOMAIN_UST:
- DBG2("Channel %s being disabled in UST global domain", uchan->name);
- /* Disable channel for global domain */
- ret = ust_app_disable_channel_glb(usess, uchan);
- break;
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- ret = LTTCOMM_NOT_IMPLEMENTED;
- goto error;
- }
-
- if (ret < 0 && ret != -EEXIST) {
- ret = LTTCOMM_UST_DISABLE_FAIL;
- goto error;
- }
-
- uchan->enabled = 0;
-
- DBG2("Channel %s disabled successfully", uchan->name);
-
- return LTTCOMM_OK;
-
-end:
-error:
- return ret;
-}
projects / lttng-tools.git / blobdiff