X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fchannel.c;h=e84da039a8e25d1f9a7ef6bfc24d0cdb0d7a0f1d;hp=8a88eccedb62ab788835468f56f193ce86d9b8fc;hb=HEAD;hpb=e9404c27e7cc9d841785e6c4292c1add19fbc1cc diff --git a/src/bin/lttng-sessiond/channel.c b/src/bin/lttng-sessiond/channel.c deleted file mode 100644 index 8a88ecced..000000000 --- a/src/bin/lttng-sessiond/channel.c +++ /dev/null @@ -1,535 +0,0 @@ -/* - * Copyright (C) 2011 - David Goulet - * Copyright (C) 2016 - Jérémie Galarneau - * - * 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 _LGPL_SOURCE -#include -#include -#include - -#include -#include -#include - -#include "channel.h" -#include "lttng-sessiond.h" -#include "kernel.h" -#include "ust-ctl.h" -#include "utils.h" -#include "ust-app.h" -#include "agent.h" - -/* - * Return allocated channel attributes. - */ -struct lttng_channel *channel_new_default_attr(int dom, - enum lttng_buffer_type type) -{ - struct lttng_channel *chan; - const char *channel_name = DEFAULT_CHANNEL_NAME; - struct lttng_channel_extended *extended_attr = NULL; - - chan = zmalloc(sizeof(struct lttng_channel)); - if (chan == NULL) { - PERROR("zmalloc channel init"); - goto error_alloc; - } - - extended_attr = zmalloc(sizeof(struct lttng_channel_extended)); - if (!extended_attr) { - PERROR("zmalloc channel extended init"); - goto error; - } - - chan->attr.extended.ptr = extended_attr; - - /* 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; - extended_attr->monitor_timer_interval = - DEFAULT_KERNEL_CHANNEL_MONITOR_TIMER; - break; - case LTTNG_DOMAIN_JUL: - channel_name = DEFAULT_JUL_CHANNEL_NAME; - goto common_ust; - case LTTNG_DOMAIN_LOG4J: - channel_name = DEFAULT_LOG4J_CHANNEL_NAME; - goto common_ust; - case LTTNG_DOMAIN_PYTHON: - channel_name = DEFAULT_PYTHON_CHANNEL_NAME; - goto common_ust; - case LTTNG_DOMAIN_UST: -common_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; - extended_attr->monitor_timer_interval = - DEFAULT_UST_UID_CHANNEL_MONITOR_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_PID_CHANNEL_LIVE_TIMER; - extended_attr->monitor_timer_interval = - DEFAULT_UST_PID_CHANNEL_MONITOR_TIMER; - break; - } - break; - default: - goto error; /* Not implemented */ - } - - if (snprintf(chan->name, sizeof(chan->name), "%s", - channel_name) < 0) { - PERROR("snprintf default channel name"); - goto error; - } - return chan; - -error: - free(extended_attr); - free(chan); -error_alloc: - return NULL; -} - -void channel_attr_destroy(struct lttng_channel *channel) -{ - if (!channel) { - return; - } - free(channel->attr.extended.ptr); - free(channel); -} - -/* - * 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; -} - -static int channel_validate(struct lttng_channel *attr) -{ - /* - * The ringbuffer (both in user space and kernel) behaves badly - * in overwrite mode and with less than 2 subbuffers so block it - * right away and send back an invalid attribute error. - */ - if (attr->attr.overwrite && attr->attr.num_subbuf < 2) { - return -1; - } - return 0; -} - -/* - * 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; - } - - /* - * Set the overwrite mode for this channel based on the session - * type unless the client explicitly overrides the channel mode. - */ - if (attr->attr.overwrite == DEFAULT_CHANNEL_OVERWRITE) { - attr->attr.overwrite = !!ksession->snapshot_mode; - } - - /* Enforce mmap output for snapshot sessions. */ - if (ksession->snapshot_mode) { - attr->attr.output = LTTNG_EVENT_MMAP; - } - - /* Validate common channel properties. */ - if (channel_validate(attr) < 0) { - ret = LTTNG_ERR_INVALID; - goto error; - } - - /* 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: - channel_attr_destroy(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; - enum lttng_domain_type domain = LTTNG_DOMAIN_UST; - - 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; - } else { - /* - * HACK: Set the channel's subdomain (JUL, Log4j, Python, etc.) - * based on the default name. - */ - if (!strcmp(attr->name, DEFAULT_JUL_CHANNEL_NAME)) { - domain = LTTNG_DOMAIN_JUL; - } else if (!strcmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME)) { - domain = LTTNG_DOMAIN_LOG4J; - } else if (!strcmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME)) { - domain = LTTNG_DOMAIN_PYTHON; - } - } - - /* - * Set the overwrite mode for this channel based on the session - * type unless the client explicitly overrides the channel mode. - */ - if (attr->attr.overwrite == DEFAULT_CHANNEL_OVERWRITE) { - attr->attr.overwrite = !!usess->snapshot_mode; - } - - /* Enforce mmap output for snapshot sessions. */ - if (usess->snapshot_mode) { - attr->attr.output = LTTNG_EVENT_MMAP; - } - - /* Validate common channel properties. */ - if (channel_validate(attr) < 0) { - ret = LTTNG_ERR_INVALID; - goto error; - } - - /* - * 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, domain); - 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(); - if (strncmp(uchan->name, DEFAULT_METADATA_NAME, - sizeof(uchan->name))) { - lttng_ht_add_unique_str(usess->domain_global.channels, &uchan->node); - } else { - /* - * Copy channel attribute to session if this is metadata so if NO - * application exists we can access that data in the shadow copy during - * the global update of newly registered application. - */ - memcpy(&usess->metadata_attr, &uchan->attr, - sizeof(usess->metadata_attr)); - } - rcu_read_unlock(); - - DBG2("Channel %s created successfully", uchan->name); - if (domain != LTTNG_DOMAIN_UST) { - struct agent *agt = trace_ust_find_agent(usess, domain); - - if (!agt) { - agt = agent_create(domain); - if (!agt) { - ret = LTTNG_ERR_NOMEM; - goto error_free_chan; - } - agent_add(agt, usess->agents); - } - } - - channel_attr_destroy(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: - channel_attr_destroy(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; -}