| 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(struct lttng_channel *chan) |
| 70 | { |
| 71 | int ret; |
| 72 | struct ltt_kernel_channel *lkc; |
| 73 | |
| 74 | lkc = malloc(sizeof(struct ltt_kernel_channel)); |
| 75 | if (lkc == NULL) { |
| 76 | perror("ltt_kernel_channel malloc"); |
| 77 | goto error; |
| 78 | } |
| 79 | |
| 80 | lkc->channel = malloc(sizeof(struct lttng_channel)); |
| 81 | if (lkc->channel == NULL) { |
| 82 | perror("lttng_channel malloc"); |
| 83 | goto error; |
| 84 | } |
| 85 | memcpy(lkc->channel, chan, sizeof(struct lttng_channel)); |
| 86 | |
| 87 | lkc->fd = 0; |
| 88 | lkc->stream_count = 0; |
| 89 | /* Init linked list */ |
| 90 | CDS_INIT_LIST_HEAD(&lkc->events_list.head); |
| 91 | CDS_INIT_LIST_HEAD(&lkc->stream_list.head); |
| 92 | /* Set default trace output path */ |
| 93 | ret = asprintf(&lkc->pathname, "%s", DEFAULT_TRACE_OUTPUT); |
| 94 | if (ret < 0) { |
| 95 | perror("asprintf kernel create channel"); |
| 96 | goto error; |
| 97 | } |
| 98 | |
| 99 | return lkc; |
| 100 | |
| 101 | error: |
| 102 | return NULL; |
| 103 | } |
| 104 | |
| 105 | /* |
| 106 | * trace_create_kernel_event |
| 107 | * |
| 108 | * Allocate and initialize a kernel event. Set name and event type. |
| 109 | * |
| 110 | * Return pointer to structure or NULL. |
| 111 | */ |
| 112 | struct ltt_kernel_event *trace_create_kernel_event(struct lttng_event *ev) |
| 113 | { |
| 114 | struct ltt_kernel_event *lke; |
| 115 | struct lttng_kernel_event *attr; |
| 116 | |
| 117 | lke = malloc(sizeof(struct ltt_kernel_event)); |
| 118 | attr = malloc(sizeof(struct lttng_kernel_event)); |
| 119 | if (lke == NULL || attr == NULL) { |
| 120 | perror("kernel event malloc"); |
| 121 | goto error; |
| 122 | } |
| 123 | |
| 124 | switch (ev->type) { |
| 125 | case LTTNG_EVENT_KPROBES: |
| 126 | attr->instrumentation = LTTNG_KERNEL_KPROBES; |
| 127 | attr->u.kprobe.addr = ev->attr.kprobe.addr; |
| 128 | attr->u.kprobe.offset = ev->attr.kprobe.offset; |
| 129 | strncpy(attr->u.kprobe.symbol_name, |
| 130 | ev->attr.kprobe.symbol_name, LTTNG_SYM_NAME_LEN); |
| 131 | break; |
| 132 | case LTTNG_EVENT_FUNCTION: |
| 133 | attr->instrumentation = LTTNG_KERNEL_FUNCTION; |
| 134 | strncpy(attr->u.ftrace.symbol_name, |
| 135 | ev->attr.ftrace.symbol_name, LTTNG_SYM_NAME_LEN); |
| 136 | break; |
| 137 | case LTTNG_EVENT_TRACEPOINTS: |
| 138 | attr->instrumentation = LTTNG_KERNEL_TRACEPOINTS; |
| 139 | break; |
| 140 | default: |
| 141 | ERR("Unknown kernel instrumentation type (%d)", ev->type); |
| 142 | goto error; |
| 143 | } |
| 144 | |
| 145 | /* Copy event name */ |
| 146 | strncpy(attr->name, ev->name, LTTNG_SYM_NAME_LEN); |
| 147 | |
| 148 | /* Setting up a kernel event */ |
| 149 | lke->fd = 0; |
| 150 | lke->event = attr; |
| 151 | |
| 152 | return lke; |
| 153 | |
| 154 | error: |
| 155 | return NULL; |
| 156 | } |
| 157 | |
| 158 | /* |
| 159 | * trace_create_kernel_metadata |
| 160 | * |
| 161 | * Allocate and initialize a kernel metadata. |
| 162 | * |
| 163 | * Return pointer to structure or NULL. |
| 164 | */ |
| 165 | struct ltt_kernel_metadata *trace_create_kernel_metadata(void) |
| 166 | { |
| 167 | int ret; |
| 168 | struct ltt_kernel_metadata *lkm; |
| 169 | struct lttng_channel *chan; |
| 170 | |
| 171 | lkm = malloc(sizeof(struct ltt_kernel_metadata)); |
| 172 | chan = malloc(sizeof(struct lttng_channel)); |
| 173 | if (lkm == NULL || chan == NULL) { |
| 174 | perror("kernel metadata malloc"); |
| 175 | goto error; |
| 176 | } |
| 177 | |
| 178 | /* Set default attributes */ |
| 179 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; |
| 180 | chan->attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE; |
| 181 | chan->attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM; |
| 182 | chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; |
| 183 | chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; |
| 184 | |
| 185 | /* Init metadata */ |
| 186 | lkm->fd = 0; |
| 187 | lkm->conf = chan; |
| 188 | /* Set default metadata path */ |
| 189 | ret = asprintf(&lkm->pathname, "%s/metadata", DEFAULT_TRACE_OUTPUT); |
| 190 | if (ret < 0) { |
| 191 | perror("asprintf kernel metadata"); |
| 192 | goto error; |
| 193 | } |
| 194 | |
| 195 | return lkm; |
| 196 | |
| 197 | error: |
| 198 | return NULL; |
| 199 | } |
| 200 | |
| 201 | /* |
| 202 | * trace_create_kernel_stream |
| 203 | * |
| 204 | * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by |
| 205 | * default. |
| 206 | * |
| 207 | * Return pointer to structure or NULL. |
| 208 | */ |
| 209 | struct ltt_kernel_stream *trace_create_kernel_stream(void) |
| 210 | { |
| 211 | struct ltt_kernel_stream *lks; |
| 212 | |
| 213 | lks = malloc(sizeof(struct ltt_kernel_stream)); |
| 214 | if (lks == NULL) { |
| 215 | perror("kernel stream malloc"); |
| 216 | goto error; |
| 217 | } |
| 218 | |
| 219 | /* Init stream */ |
| 220 | lks->fd = 0; |
| 221 | lks->pathname = NULL; |
| 222 | lks->state = 0; |
| 223 | |
| 224 | return lks; |
| 225 | |
| 226 | error: |
| 227 | return NULL; |
| 228 | } |
| 229 | |
| 230 | void trace_destroy_kernel_stream(struct ltt_kernel_stream *stream) |
| 231 | { |
| 232 | DBG("[trace] Closing stream fd %d", stream->fd); |
| 233 | /* Close kernel fd */ |
| 234 | close(stream->fd); |
| 235 | free(stream->pathname); |
| 236 | |
| 237 | /* Remove from stream list */ |
| 238 | cds_list_del(&stream->list); |
| 239 | free(stream); |
| 240 | } |
| 241 | |
| 242 | void trace_destroy_kernel_event(struct ltt_kernel_event *event) |
| 243 | { |
| 244 | DBG("[trace] Closing event fd %d", event->fd); |
| 245 | /* Close kernel fd */ |
| 246 | close(event->fd); |
| 247 | /* Free attributes */ |
| 248 | free(event->event); |
| 249 | |
| 250 | /* Remove from event list */ |
| 251 | cds_list_del(&event->list); |
| 252 | free(event); |
| 253 | } |
| 254 | |
| 255 | void trace_destroy_kernel_channel(struct ltt_kernel_channel *channel) |
| 256 | { |
| 257 | struct ltt_kernel_stream *stream; |
| 258 | struct ltt_kernel_event *event; |
| 259 | |
| 260 | DBG("[trace] Closing channel fd %d", channel->fd); |
| 261 | /* Close kernel fd */ |
| 262 | close(channel->fd); |
| 263 | free(channel->pathname); |
| 264 | /* Free attributes structure */ |
| 265 | free(channel->channel); |
| 266 | |
| 267 | /* For each stream in the channel list */ |
| 268 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
| 269 | trace_destroy_kernel_stream(stream); |
| 270 | } |
| 271 | |
| 272 | /* For each event in the channel list */ |
| 273 | cds_list_for_each_entry(event, &channel->events_list.head, list) { |
| 274 | trace_destroy_kernel_event(event); |
| 275 | } |
| 276 | |
| 277 | /* Remove from channel list */ |
| 278 | cds_list_del(&channel->list); |
| 279 | free(channel); |
| 280 | } |
| 281 | |
| 282 | void trace_destroy_kernel_metadata(struct ltt_kernel_metadata *metadata) |
| 283 | { |
| 284 | DBG("[trace] Closing metadata fd %d", metadata->fd); |
| 285 | /* Close kernel fd */ |
| 286 | close(metadata->fd); |
| 287 | /* Free attributes */ |
| 288 | free(metadata->conf); |
| 289 | |
| 290 | free(metadata); |
| 291 | } |
| 292 | |
| 293 | void trace_destroy_kernel_session(struct ltt_kernel_session *session) |
| 294 | { |
| 295 | struct ltt_kernel_channel *channel; |
| 296 | |
| 297 | DBG("[trace] Closing session fd %d", session->fd); |
| 298 | /* Close kernel fds */ |
| 299 | close(session->fd); |
| 300 | if (session->metadata_stream_fd != 0) { |
| 301 | DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd); |
| 302 | close(session->metadata_stream_fd); |
| 303 | } |
| 304 | |
| 305 | trace_destroy_kernel_metadata(session->metadata); |
| 306 | |
| 307 | cds_list_for_each_entry(channel, &session->channel_list.head, list) { |
| 308 | trace_destroy_kernel_channel(channel); |
| 309 | } |
| 310 | |
| 311 | free(session); |
| 312 | } |