X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fchannel.c;h=e11d6d11fbcffa74d813d0722dcc7a4e65bc10aa;hp=58a36b97c8b2f54085ed0b2ad463ef005c68d53a;hb=0525e9ae15d215943d8187e7f190d5a45e723085;hpb=b024d072031acc6eec7e083de606fbce11aab882 diff --git a/src/bin/lttng-sessiond/channel.c b/src/bin/lttng-sessiond/channel.c index 58a36b97c..e11d6d11f 100644 --- a/src/bin/lttng-sessiond/channel.c +++ b/src/bin/lttng-sessiond/channel.c @@ -1,18 +1,18 @@ /* * 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 as published by the Free - * Software Foundation; only version 2 of the License. + * 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. + * 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. + * 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 @@ -54,7 +54,8 @@ struct lttng_channel *channel_new_default_attr(int dom) switch (dom) { case LTTNG_DOMAIN_KERNEL: - chan->attr.subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE; + 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; break; @@ -64,7 +65,7 @@ struct lttng_channel *channel_new_default_attr(int dom) 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.subbuf_size = default_get_ust_channel_subbuf_size(); chan->attr.num_subbuf = DEFAULT_UST_CHANNEL_SUBBUF_NUM; chan->attr.output = DEFAULT_UST_CHANNEL_OUTPUT; break; @@ -89,19 +90,25 @@ int channel_kernel_disable(struct ltt_kernel_session *ksession, 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 = LTTCOMM_KERN_CHAN_NOT_FOUND; + ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; goto error; - } else if (kchan->enabled == 1) { + } + + /* Only if channel is enabled disable it. */ + if (kchan->enabled == 1) { ret = kernel_disable_channel(kchan); if (ret < 0 && ret != -EEXIST) { - ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL; + ret = LTTNG_ERR_KERN_CHAN_DISABLE_FAIL; goto error; } } - ret = LTTCOMM_OK; + ret = LTTNG_OK; error: return ret; @@ -115,15 +122,21 @@ int channel_kernel_enable(struct ltt_kernel_session *ksession, { int ret; + assert(ksession); + assert(kchan); + if (kchan->enabled == 0) { ret = kernel_enable_channel(kchan); if (ret < 0) { - ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL; + ret = LTTNG_ERR_KERN_CHAN_ENABLE_FAIL; goto error; } + } else { + ret = LTTNG_ERR_KERN_CHAN_EXIST; + goto error; } - ret = LTTCOMM_OK; + ret = LTTNG_OK; error: return ret; @@ -138,11 +151,13 @@ int channel_kernel_create(struct ltt_kernel_session *ksession, 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); if (defattr == NULL) { - ret = LTTCOMM_FATAL; + ret = LTTNG_ERR_FATAL; goto error; } attr = defattr; @@ -151,18 +166,18 @@ int channel_kernel_create(struct ltt_kernel_session *ksession, /* Channel not found, creating it */ ret = kernel_create_channel(ksession, attr, ksession->trace_path); if (ret < 0) { - ret = LTTCOMM_KERN_CHAN_FAIL; + 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 = LTTCOMM_FATAL; + ret = LTTNG_ERR_FATAL; goto error; } - ret = LTTCOMM_OK; + ret = LTTNG_OK; error: free(defattr); return ret; @@ -174,19 +189,31 @@ error: int channel_ust_enable(struct ltt_ust_session *usess, int domain, struct ltt_ust_channel *uchan) { - int ret = LTTCOMM_OK; + 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; } 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); + + /* + * 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_create_channel_glb(usess, uchan); break; #if 0 case LTTNG_DOMAIN_UST_PID: @@ -194,19 +221,10 @@ int channel_ust_enable(struct ltt_ust_session *usess, int domain, case LTTNG_DOMAIN_UST_EXEC_NAME: #endif default: - ret = LTTCOMM_UND; + ret = LTTNG_ERR_UND; 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); @@ -221,39 +239,53 @@ error: int channel_ust_create(struct ltt_ust_session *usess, int domain, struct lttng_channel *attr) { - int ret = LTTCOMM_OK; + 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(domain); if (defattr == NULL) { - ret = LTTCOMM_FATAL; + ret = LTTNG_ERR_FATAL; goto error; } attr = defattr; } + if (attr->attr.subbuf_size < DEFAULT_UST_CHANNEL_SUBBUF_SIZE) { + 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). + * 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 = LTTCOMM_INVALID; + 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 = LTTCOMM_INVALID; + + 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 = LTTCOMM_FATAL; + ret = LTTNG_ERR_FATAL; goto error; } uchan->enabled = 1; @@ -271,12 +303,12 @@ int channel_ust_create(struct ltt_ust_session *usess, int domain, case LTTNG_DOMAIN_UST_EXEC_NAME: #endif default: - ret = LTTCOMM_UND; + ret = LTTNG_ERR_UND; goto error_free_chan; } - if (ret < 0 && ret != -EEXIST) { - ret = LTTCOMM_UST_CHAN_ENABLE_FAIL; + if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { + ret = LTTNG_ERR_UST_CHAN_FAIL; goto error_free_chan; } @@ -288,7 +320,7 @@ int channel_ust_create(struct ltt_ust_session *usess, int domain, DBG2("Channel %s created successfully", uchan->name); free(defattr); - return LTTCOMM_OK; + return LTTNG_OK; error_free_chan: /* @@ -307,7 +339,10 @@ error: int channel_ust_disable(struct ltt_ust_session *usess, int domain, struct ltt_ust_channel *uchan) { - int ret = LTTCOMM_OK; + int ret = LTTNG_OK; + + assert(usess); + assert(uchan); /* Already disabled */ if (uchan->enabled == 0) { @@ -328,12 +363,12 @@ int channel_ust_disable(struct ltt_ust_session *usess, int domain, case LTTNG_DOMAIN_UST_PID: #endif default: - ret = LTTCOMM_UND; + ret = LTTNG_ERR_UND; goto error; } - if (ret < 0 && ret != -EEXIST) { - ret = LTTCOMM_UST_DISABLE_FAIL; + if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { + ret = LTTNG_ERR_UST_CHAN_DISABLE_FAIL; goto error; } @@ -341,7 +376,7 @@ int channel_ust_disable(struct ltt_ust_session *usess, int domain, DBG2("Channel %s disabled successfully", uchan->name); - return LTTCOMM_OK; + return LTTNG_OK; end: error: