| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * Copyright (C) 2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License, version 2 only, |
| 7 | * as published by the Free Software Foundation. |
| 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 along |
| 15 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 <common/error.h> |
| 27 | #include <common/sessiond-comm/sessiond-comm.h> |
| 28 | |
| 29 | #include "filter.h" |
| 30 | #include "kernel.h" |
| 31 | #include "ust-app.h" |
| 32 | #include "trace-ust.h" |
| 33 | |
| 34 | /* |
| 35 | * Add UST context to event. |
| 36 | */ |
| 37 | static int add_ufilter_to_event(struct ltt_ust_session *usess, int domain, |
| 38 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, |
| 39 | struct lttng_filter_bytecode *bytecode) |
| 40 | { |
| 41 | int ret; |
| 42 | |
| 43 | if (uevent->filter) { |
| 44 | ret = -EEXIST; |
| 45 | goto error; |
| 46 | } |
| 47 | /* Same layout. */ |
| 48 | uevent->filter = (struct lttng_ust_filter_bytecode *) bytecode; |
| 49 | uevent->filter->seqnum = usess->filter_seq_num; |
| 50 | |
| 51 | switch (domain) { |
| 52 | case LTTNG_DOMAIN_UST: |
| 53 | ret = ust_app_set_filter_event_glb(usess, uchan, uevent, |
| 54 | bytecode); |
| 55 | if (ret < 0) { |
| 56 | goto error; |
| 57 | } |
| 58 | usess->filter_seq_num++; |
| 59 | break; |
| 60 | default: |
| 61 | ret = -ENOSYS; |
| 62 | goto error; |
| 63 | } |
| 64 | |
| 65 | DBG("Filter UST added to event %s",uevent->attr.name); |
| 66 | |
| 67 | return 0; |
| 68 | |
| 69 | error: |
| 70 | free(bytecode); |
| 71 | return ret; |
| 72 | } |
| 73 | |
| 74 | /* |
| 75 | * Add UST context to tracer. |
| 76 | */ |
| 77 | int filter_ust_set(struct ltt_ust_session *usess, int domain, |
| 78 | struct lttng_filter_bytecode *bytecode, struct lttng_event *event, |
| 79 | char *channel_name) |
| 80 | { |
| 81 | int ret = LTTNG_OK, have_event = 0; |
| 82 | struct lttng_ht_iter iter; |
| 83 | struct lttng_ht *chan_ht; |
| 84 | struct ltt_ust_channel *uchan = NULL; |
| 85 | struct ltt_ust_event *uevent = NULL; |
| 86 | |
| 87 | /* |
| 88 | * Define which channel's hashtable to use from the domain or quit if |
| 89 | * unknown domain. |
| 90 | */ |
| 91 | switch (domain) { |
| 92 | case LTTNG_DOMAIN_UST: |
| 93 | chan_ht = usess->domain_global.channels; |
| 94 | break; |
| 95 | #if 0 |
| 96 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
| 97 | case LTTNG_DOMAIN_UST_PID: |
| 98 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
| 99 | #endif |
| 100 | default: |
| 101 | ret = LTTNG_ERR_UND; |
| 102 | goto error; |
| 103 | } |
| 104 | |
| 105 | /* Do we have a valid event. */ |
| 106 | if (event && event->name[0] != '\0') { |
| 107 | have_event = 1; |
| 108 | } |
| 109 | |
| 110 | /* Get UST channel if defined */ |
| 111 | if (strlen(channel_name) != 0) { |
| 112 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); |
| 113 | if (uchan == NULL) { |
| 114 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
| 115 | goto error; |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | /* If UST channel specified and event name, get UST event ref */ |
| 120 | if (uchan && have_event) { |
| 121 | uevent = trace_ust_find_event(uchan->events, event->name, bytecode, |
| 122 | event->loglevel); |
| 123 | if (uevent == NULL) { |
| 124 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
| 125 | goto error; |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | /* At this point, we have 4 possibilities */ |
| 130 | |
| 131 | if (uchan && uevent) { /* Add filter to event in channel */ |
| 132 | ret = add_ufilter_to_event(usess, domain, uchan, uevent, |
| 133 | bytecode); |
| 134 | } else if (uchan && !have_event) { /* Add filter to channel */ |
| 135 | ERR("Cannot add filter to channel"); |
| 136 | ret = LTTNG_ERR_FATAL; /* not supported. */ |
| 137 | goto error; |
| 138 | } else if (!uchan && have_event) { /* Add filter to event */ |
| 139 | /* Add context to event without having the channel name */ |
| 140 | cds_lfht_for_each_entry(chan_ht->ht, &iter.iter, uchan, node.node) { |
| 141 | uevent = trace_ust_find_event(uchan->events, event->name, bytecode, |
| 142 | event->loglevel); |
| 143 | if (uevent != NULL) { |
| 144 | ret = add_ufilter_to_event(usess, domain, uchan, uevent, bytecode); |
| 145 | /* |
| 146 | * LTTng UST does not allowed the same event to be registered |
| 147 | * multiple time in different or the same channel. So, if we |
| 148 | * found our event, we stop. |
| 149 | */ |
| 150 | goto end; |
| 151 | } |
| 152 | } |
| 153 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
| 154 | goto error; |
| 155 | } else if (!uchan && !have_event) { /* Add filter all events, all channels */ |
| 156 | ERR("Cannot add filter to channel"); |
| 157 | ret = LTTNG_ERR_FATAL; /* not supported. */ |
| 158 | goto error; |
| 159 | } |
| 160 | |
| 161 | end: |
| 162 | /* Must handle both local internal error and UST code. */ |
| 163 | switch (ret) { |
| 164 | case -EEXIST: |
| 165 | case -LTTNG_UST_ERR_EXIST: |
| 166 | ret = LTTNG_ERR_FILTER_EXIST; |
| 167 | break; |
| 168 | case -ENOMEM: |
| 169 | ret = LTTNG_ERR_FATAL; |
| 170 | break; |
| 171 | case -EINVAL: |
| 172 | case -LTTNG_UST_ERR_INVAL: |
| 173 | ret = LTTNG_ERR_FILTER_INVAL; |
| 174 | break; |
| 175 | case -ENOSYS: |
| 176 | case -LTTNG_UST_ERR_NOSYS: |
| 177 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
| 178 | break; |
| 179 | default: |
| 180 | ret = LTTNG_OK; |
| 181 | break; |
| 182 | } |
| 183 | |
| 184 | error: |
| 185 | return ret; |
| 186 | } |