X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;ds=sidebyside;f=src%2Fbin%2Flttng-sessiond%2Fchannel.c;h=e84da039a8e25d1f9a7ef6bfc24d0cdb0d7a0f1d;hb=HEAD;hp=e2cdf563a6bbc42f9cf6f583b323c8c25b6217b8;hpb=a79d84dd6bf849361c34616ae9f60786c6a6bf20;p=lttng-tools.git diff --git a/src/bin/lttng-sessiond/channel.c b/src/bin/lttng-sessiond/channel.c deleted file mode 100644 index e2cdf563a..000000000 --- a/src/bin/lttng-sessiond/channel.c +++ /dev/null @@ -1,358 +0,0 @@ -/* - * Copyright (C) 2011 - David Goulet - * - * 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 -#include - -#include -#include -#include - -#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: -#if 0 - case LTTNG_DOMAIN_UST_PID: - case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: - case LTTNG_DOMAIN_UST_EXEC_NAME: -#endif - 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 = LTTNG_ERR_KERN_CHAN_NOT_FOUND; - goto error; - } else 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; - - 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; - - /* Creating channel attributes if needed */ - if (attr == NULL) { - defattr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL); - if (defattr == NULL) { - ret = LTTNG_ERR_FATAL; - goto error; - } - attr = defattr; - } - - /* Channel not found, creating it */ - ret = kernel_create_channel(ksession, attr, ksession->trace_path); - 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, int domain, - struct ltt_ust_channel *uchan) -{ - int ret = LTTNG_OK; - - /* 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; - } - - 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; -#if 0 - case LTTNG_DOMAIN_UST_PID: - case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: - case LTTNG_DOMAIN_UST_EXEC_NAME: -#endif - default: - ret = LTTNG_ERR_UND; - goto error; - } - - if (ret < 0) { - if (ret != -EEXIST) { - ret = LTTNG_ERR_UST_CHAN_ENABLE_FAIL; - goto error; - } else { - ret = LTTNG_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 = LTTNG_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 = LTTNG_ERR_FATAL; - goto error; - } - attr = defattr; - } - - /* - * 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; - } - 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; - } - - /* Create UST channel */ - uchan = trace_ust_create_channel(attr, usess->pathname); - if (uchan == NULL) { - ret = LTTNG_ERR_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; -#if 0 - case LTTNG_DOMAIN_UST_PID: - case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: - case LTTNG_DOMAIN_UST_EXEC_NAME: -#endif - default: - ret = LTTNG_ERR_UND; - goto error_free_chan; - } - - if (ret < 0 && ret != -EEXIST) { - 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, int domain, - struct ltt_ust_channel *uchan) -{ - int ret = LTTNG_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; -#if 0 - case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: - case LTTNG_DOMAIN_UST_EXEC_NAME: - case LTTNG_DOMAIN_UST_PID: -#endif - default: - ret = LTTNG_ERR_UND; - goto error; - } - - if (ret < 0 && ret != -EEXIST) { - 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; -}