| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version 2 |
| 7 | * of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #define _GNU_SOURCE |
| 20 | #include <stdio.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <string.h> |
| 23 | #include <unistd.h> |
| 24 | #include <urcu/list.h> |
| 25 | |
| 26 | #include "lttngerr.h" |
| 27 | #include "ltt-sessiond.h" |
| 28 | #include "trace.h" |
| 29 | |
| 30 | /* |
| 31 | * trace_create_kernel_session |
| 32 | * |
| 33 | * Allocate and initialize a kernel session data structure. |
| 34 | * |
| 35 | * Return pointer to structure or NULL. |
| 36 | */ |
| 37 | struct ltt_kernel_session *trace_create_kernel_session(void) |
| 38 | { |
| 39 | struct ltt_kernel_session *lks; |
| 40 | |
| 41 | /* Allocate a new ltt kernel session */ |
| 42 | lks = malloc(sizeof(struct ltt_kernel_session)); |
| 43 | if (lks == NULL) { |
| 44 | perror("create kernel session malloc"); |
| 45 | goto error; |
| 46 | } |
| 47 | |
| 48 | /* Init data structure */ |
| 49 | lks->fd = 0; |
| 50 | lks->metadata_stream_fd = 0; |
| 51 | lks->channel_count = 0; |
| 52 | lks->stream_count_global = 0; |
| 53 | lks->metadata = NULL; |
| 54 | CDS_INIT_LIST_HEAD(&lks->channel_list.head); |
| 55 | |
| 56 | return lks; |
| 57 | |
| 58 | error: |
| 59 | return NULL; |
| 60 | } |
| 61 | |
| 62 | /* |
| 63 | * trace_create_kernel_channel |
| 64 | * |
| 65 | * Allocate and initialize a kernel channel data structure. |
| 66 | * |
| 67 | * Return pointer to structure or NULL. |
| 68 | */ |
| 69 | struct ltt_kernel_channel *trace_create_kernel_channel(void) |
| 70 | { |
| 71 | int ret; |
| 72 | struct ltt_kernel_channel *lkc; |
| 73 | struct lttng_kernel_channel *chan; |
| 74 | |
| 75 | lkc = malloc(sizeof(struct ltt_kernel_channel)); |
| 76 | chan = malloc(sizeof(struct lttng_kernel_channel)); |
| 77 | if (lkc == NULL || chan == NULL) { |
| 78 | perror("kernel channel malloc"); |
| 79 | goto error; |
| 80 | } |
| 81 | |
| 82 | /* Default value to channel */ |
| 83 | chan->overwrite = DEFAULT_KERNEL_OVERWRITE; |
| 84 | chan->subbuf_size = DEFAULT_KERNEL_SUBBUF_SIZE; |
| 85 | chan->num_subbuf = DEFAULT_KERNEL_SUBBUF_NUM; |
| 86 | chan->switch_timer_interval = DEFAULT_KERNEL_SWITCH_TIMER; |
| 87 | chan->read_timer_interval = DEFAULT_KERNEL_READ_TIMER; |
| 88 | |
| 89 | lkc->fd = 0; |
| 90 | lkc->stream_count = 0; |
| 91 | lkc->channel = chan; |
| 92 | /* Init linked list */ |
| 93 | CDS_INIT_LIST_HEAD(&lkc->events_list.head); |
| 94 | CDS_INIT_LIST_HEAD(&lkc->stream_list.head); |
| 95 | /* Set default trace output path */ |
| 96 | ret = asprintf(&lkc->pathname, "%s", DEFAULT_TRACE_OUTPUT); |
| 97 | if (ret < 0) { |
| 98 | perror("asprintf kernel create channel"); |
| 99 | goto error; |
| 100 | } |
| 101 | |
| 102 | return lkc; |
| 103 | |
| 104 | error: |
| 105 | return NULL; |
| 106 | } |
| 107 | |
| 108 | /* |
| 109 | * trace_create_kernel_event |
| 110 | * |
| 111 | * Allocate and initialize a kernel event. Set name and event type. |
| 112 | * |
| 113 | * Return pointer to structure or NULL. |
| 114 | */ |
| 115 | struct ltt_kernel_event *trace_create_kernel_event(char *name, |
| 116 | enum lttng_kernel_instrumentation type) |
| 117 | { |
| 118 | struct ltt_kernel_event *lke; |
| 119 | struct lttng_kernel_event *attr; |
| 120 | |
| 121 | lke = malloc(sizeof(struct ltt_kernel_event)); |
| 122 | attr = malloc(sizeof(struct lttng_kernel_event)); |
| 123 | if (lke == NULL || attr == NULL) { |
| 124 | perror("kernel event malloc"); |
| 125 | goto error; |
| 126 | } |
| 127 | |
| 128 | /* Init event attribute */ |
| 129 | attr->instrumentation = type; |
| 130 | strncpy(attr->name, name, LTTNG_SYM_NAME_LEN); |
| 131 | /* Setting up a kernel event */ |
| 132 | lke->fd = 0; |
| 133 | lke->event = attr; |
| 134 | |
| 135 | return lke; |
| 136 | |
| 137 | error: |
| 138 | return NULL; |
| 139 | } |
| 140 | |
| 141 | /* |
| 142 | * trace_create_kernel_metadata |
| 143 | * |
| 144 | * Allocate and initialize a kernel metadata. |
| 145 | * |
| 146 | * Return pointer to structure or NULL. |
| 147 | */ |
| 148 | struct ltt_kernel_metadata *trace_create_kernel_metadata(void) |
| 149 | { |
| 150 | int ret; |
| 151 | struct ltt_kernel_metadata *lkm; |
| 152 | struct lttng_kernel_channel *attr; |
| 153 | |
| 154 | lkm = malloc(sizeof(struct ltt_kernel_metadata)); |
| 155 | attr = malloc(sizeof(struct lttng_kernel_channel)); |
| 156 | if (lkm == NULL || attr == NULL) { |
| 157 | perror("kernel metadata malloc"); |
| 158 | goto error; |
| 159 | } |
| 160 | |
| 161 | /* Set default attributes */ |
| 162 | attr->overwrite = DEFAULT_KERNEL_OVERWRITE; |
| 163 | attr->subbuf_size = DEFAULT_KERNEL_SUBBUF_SIZE; |
| 164 | attr->num_subbuf = DEFAULT_KERNEL_SUBBUF_NUM; |
| 165 | attr->switch_timer_interval = DEFAULT_KERNEL_SWITCH_TIMER; |
| 166 | attr->read_timer_interval = DEFAULT_KERNEL_READ_TIMER; |
| 167 | |
| 168 | /* Init metadata */ |
| 169 | lkm->fd = 0; |
| 170 | lkm->conf = attr; |
| 171 | /* Set default metadata path */ |
| 172 | ret = asprintf(&lkm->pathname, "%s/metadata", DEFAULT_TRACE_OUTPUT); |
| 173 | if (ret < 0) { |
| 174 | perror("asprintf kernel metadata"); |
| 175 | goto error; |
| 176 | } |
| 177 | |
| 178 | return lkm; |
| 179 | |
| 180 | error: |
| 181 | return NULL; |
| 182 | } |
| 183 | |
| 184 | /* |
| 185 | * trace_create_kernel_stream |
| 186 | * |
| 187 | * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by |
| 188 | * default. |
| 189 | * |
| 190 | * Return pointer to structure or NULL. |
| 191 | */ |
| 192 | struct ltt_kernel_stream *trace_create_kernel_stream(void) |
| 193 | { |
| 194 | struct ltt_kernel_stream *lks; |
| 195 | |
| 196 | lks = malloc(sizeof(struct ltt_kernel_stream)); |
| 197 | if (lks == NULL) { |
| 198 | perror("kernel stream malloc"); |
| 199 | goto error; |
| 200 | } |
| 201 | |
| 202 | /* Init stream */ |
| 203 | lks->fd = 0; |
| 204 | lks->pathname = NULL; |
| 205 | lks->state = 0; |
| 206 | |
| 207 | return lks; |
| 208 | |
| 209 | error: |
| 210 | return NULL; |
| 211 | } |
| 212 | |
| 213 | void trace_destroy_kernel_stream(struct ltt_kernel_stream *stream) |
| 214 | { |
| 215 | DBG("[trace] Closing stream fd %d", stream->fd); |
| 216 | /* Close kernel fd */ |
| 217 | close(stream->fd); |
| 218 | free(stream->pathname); |
| 219 | |
| 220 | /* Remove from stream list */ |
| 221 | cds_list_del(&stream->list); |
| 222 | free(stream); |
| 223 | } |
| 224 | |
| 225 | void trace_destroy_kernel_event(struct ltt_kernel_event *event) |
| 226 | { |
| 227 | DBG("[trace] Closing event fd %d", event->fd); |
| 228 | /* Close kernel fd */ |
| 229 | close(event->fd); |
| 230 | /* Free attributes */ |
| 231 | free(event->event); |
| 232 | |
| 233 | /* Remove from event list */ |
| 234 | cds_list_del(&event->list); |
| 235 | free(event); |
| 236 | } |
| 237 | |
| 238 | void trace_destroy_kernel_channel(struct ltt_kernel_channel *channel) |
| 239 | { |
| 240 | struct ltt_kernel_stream *stream; |
| 241 | struct ltt_kernel_event *event; |
| 242 | |
| 243 | DBG("[trace] Closing channel fd %d", channel->fd); |
| 244 | /* Close kernel fd */ |
| 245 | close(channel->fd); |
| 246 | free(channel->pathname); |
| 247 | /* Free attributes structure */ |
| 248 | free(channel->channel); |
| 249 | |
| 250 | /* For each stream in the channel list */ |
| 251 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
| 252 | trace_destroy_kernel_stream(stream); |
| 253 | } |
| 254 | |
| 255 | /* For each event in the channel list */ |
| 256 | cds_list_for_each_entry(event, &channel->events_list.head, list) { |
| 257 | trace_destroy_kernel_event(event); |
| 258 | } |
| 259 | |
| 260 | /* Remove from channel list */ |
| 261 | cds_list_del(&channel->list); |
| 262 | free(channel); |
| 263 | } |
| 264 | |
| 265 | void trace_destroy_kernel_metadata(struct ltt_kernel_metadata *metadata) |
| 266 | { |
| 267 | DBG("[trace] Closing metadata fd %d", metadata->fd); |
| 268 | /* Close kernel fd */ |
| 269 | close(metadata->fd); |
| 270 | /* Free attributes */ |
| 271 | free(metadata->conf); |
| 272 | |
| 273 | free(metadata); |
| 274 | } |
| 275 | |
| 276 | void trace_destroy_kernel_session(struct ltt_kernel_session *session) |
| 277 | { |
| 278 | struct ltt_kernel_channel *channel; |
| 279 | |
| 280 | DBG("[trace] Closing session fd %d", session->fd); |
| 281 | /* Close kernel fds */ |
| 282 | close(session->fd); |
| 283 | DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd); |
| 284 | close(session->metadata_stream_fd); |
| 285 | |
| 286 | trace_destroy_kernel_metadata(session->metadata); |
| 287 | |
| 288 | cds_list_for_each_entry(channel, &session->channel_list.head, list) { |
| 289 | trace_destroy_kernel_channel(channel); |
| 290 | } |
| 291 | |
| 292 | free(session); |
| 293 | } |