| 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 <urcu/list.h> |
| 24 | |
| 25 | #include "ltt-sessiond.h" |
| 26 | #include "trace.h" |
| 27 | |
| 28 | /* |
| 29 | * trace_create_kernel_session |
| 30 | * |
| 31 | * Allocate and initialize a kernel session data structure. |
| 32 | * |
| 33 | * Return pointer to structure or NULL. |
| 34 | */ |
| 35 | struct ltt_kernel_session *trace_create_kernel_session(void) |
| 36 | { |
| 37 | struct ltt_kernel_session *lks; |
| 38 | |
| 39 | /* Allocate a new ltt kernel session */ |
| 40 | lks = malloc(sizeof(struct ltt_kernel_session)); |
| 41 | if (lks == NULL) { |
| 42 | perror("create kernel session malloc"); |
| 43 | goto error; |
| 44 | } |
| 45 | |
| 46 | /* Init data structure */ |
| 47 | lks->fd = 0; |
| 48 | lks->metadata_stream_fd = 0; |
| 49 | lks->channel_count = 0; |
| 50 | lks->stream_count_global = 0; |
| 51 | lks->metadata = NULL; |
| 52 | CDS_INIT_LIST_HEAD(&lks->channel_list.head); |
| 53 | |
| 54 | return lks; |
| 55 | |
| 56 | error: |
| 57 | return NULL; |
| 58 | } |
| 59 | |
| 60 | /* |
| 61 | * trace_create_kernel_channel |
| 62 | * |
| 63 | * Allocate and initialize a kernel channel data structure. |
| 64 | * |
| 65 | * Return pointer to structure or NULL. |
| 66 | */ |
| 67 | struct ltt_kernel_channel *trace_create_kernel_channel(void) |
| 68 | { |
| 69 | int ret; |
| 70 | struct ltt_kernel_channel *lkc; |
| 71 | struct lttng_kernel_channel *chan; |
| 72 | |
| 73 | lkc = malloc(sizeof(struct ltt_kernel_channel)); |
| 74 | chan = malloc(sizeof(struct lttng_kernel_channel)); |
| 75 | if (lkc == NULL || chan == NULL) { |
| 76 | perror("kernel channel malloc"); |
| 77 | goto error; |
| 78 | } |
| 79 | |
| 80 | /* Default value to channel */ |
| 81 | chan->overwrite = DEFAULT_KERNEL_OVERWRITE; |
| 82 | chan->subbuf_size = DEFAULT_KERNEL_SUBBUF_SIZE; |
| 83 | chan->num_subbuf = DEFAULT_KERNEL_SUBBUF_NUM; |
| 84 | chan->switch_timer_interval = DEFAULT_KERNEL_SWITCH_TIMER; |
| 85 | chan->read_timer_interval = DEFAULT_KERNEL_READ_TIMER; |
| 86 | |
| 87 | lkc->fd = 0; |
| 88 | lkc->stream_count = 0; |
| 89 | lkc->channel = chan; |
| 90 | /* Init linked list */ |
| 91 | CDS_INIT_LIST_HEAD(&lkc->events_list.head); |
| 92 | CDS_INIT_LIST_HEAD(&lkc->stream_list.head); |
| 93 | /* Set default trace output path */ |
| 94 | ret = asprintf(&lkc->pathname, "%s", DEFAULT_TRACE_OUTPUT); |
| 95 | if (ret < 0) { |
| 96 | perror("asprintf kernel create channel"); |
| 97 | goto error; |
| 98 | } |
| 99 | |
| 100 | return lkc; |
| 101 | |
| 102 | error: |
| 103 | return NULL; |
| 104 | } |
| 105 | |
| 106 | /* |
| 107 | * trace_create_kernel_event |
| 108 | * |
| 109 | * Allocate and initialize a kernel event. Set name and event type. |
| 110 | * |
| 111 | * Return pointer to structure or NULL. |
| 112 | */ |
| 113 | struct ltt_kernel_event *trace_create_kernel_event(char *name, |
| 114 | enum lttng_kernel_instrumentation type) |
| 115 | { |
| 116 | struct ltt_kernel_event *lke; |
| 117 | struct lttng_kernel_event *attr; |
| 118 | |
| 119 | lke = malloc(sizeof(struct ltt_kernel_event)); |
| 120 | attr = malloc(sizeof(struct lttng_kernel_event)); |
| 121 | if (lke == NULL || attr == NULL) { |
| 122 | perror("kernel event malloc"); |
| 123 | goto error; |
| 124 | } |
| 125 | |
| 126 | /* Init event attribute */ |
| 127 | attr->instrumentation = type; |
| 128 | strncpy(attr->name, name, LTTNG_SYM_NAME_LEN); |
| 129 | /* Setting up a kernel event */ |
| 130 | lke->fd = 0; |
| 131 | lke->event = attr; |
| 132 | |
| 133 | return lke; |
| 134 | |
| 135 | error: |
| 136 | return NULL; |
| 137 | } |
| 138 | |
| 139 | /* |
| 140 | * trace_create_kernel_metadata |
| 141 | * |
| 142 | * Allocate and initialize a kernel metadata. |
| 143 | * |
| 144 | * Return pointer to structure or NULL. |
| 145 | */ |
| 146 | struct ltt_kernel_metadata *trace_create_kernel_metadata(void) |
| 147 | { |
| 148 | int ret; |
| 149 | struct ltt_kernel_metadata *lkm; |
| 150 | struct lttng_kernel_channel *attr; |
| 151 | |
| 152 | lkm = malloc(sizeof(struct ltt_kernel_metadata)); |
| 153 | attr = malloc(sizeof(struct lttng_kernel_channel)); |
| 154 | if (lkm == NULL || attr == NULL) { |
| 155 | perror("kernel metadata malloc"); |
| 156 | goto error; |
| 157 | } |
| 158 | |
| 159 | /* Set default attributes */ |
| 160 | attr->overwrite = DEFAULT_KERNEL_OVERWRITE; |
| 161 | attr->subbuf_size = DEFAULT_KERNEL_SUBBUF_SIZE; |
| 162 | attr->num_subbuf = DEFAULT_KERNEL_SUBBUF_NUM; |
| 163 | attr->switch_timer_interval = DEFAULT_KERNEL_SWITCH_TIMER; |
| 164 | attr->read_timer_interval = DEFAULT_KERNEL_READ_TIMER; |
| 165 | |
| 166 | /* Init metadata */ |
| 167 | lkm->fd = 0; |
| 168 | lkm->conf = attr; |
| 169 | /* Set default metadata path */ |
| 170 | ret = asprintf(&lkm->pathname, "%s/metadata", DEFAULT_TRACE_OUTPUT); |
| 171 | if (ret < 0) { |
| 172 | perror("asprintf kernel metadata"); |
| 173 | goto error; |
| 174 | } |
| 175 | |
| 176 | return lkm; |
| 177 | |
| 178 | error: |
| 179 | return NULL; |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * trace_create_kernel_stream |
| 184 | * |
| 185 | * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by |
| 186 | * default. |
| 187 | * |
| 188 | * Return pointer to structure or NULL. |
| 189 | */ |
| 190 | struct ltt_kernel_stream *trace_create_kernel_stream(void) |
| 191 | { |
| 192 | struct ltt_kernel_stream *lks; |
| 193 | |
| 194 | lks = malloc(sizeof(struct ltt_kernel_stream)); |
| 195 | if (lks == NULL) { |
| 196 | perror("kernel stream malloc"); |
| 197 | goto error; |
| 198 | } |
| 199 | |
| 200 | /* Init stream */ |
| 201 | lks->fd = 0; |
| 202 | lks->pathname = NULL; |
| 203 | lks->state = 0; |
| 204 | |
| 205 | return lks; |
| 206 | |
| 207 | error: |
| 208 | return NULL; |
| 209 | } |