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53a80697 MD |
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; | |
f3f0db50 | 49 | uevent->filter->seqnum = usess->filter_seq_num; |
53a80697 MD |
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 | } | |
f3f0db50 | 58 | usess->filter_seq_num++; |
53a80697 MD |
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, | |
178191b3 | 78 | struct lttng_filter_bytecode *bytecode, struct lttng_event *event, |
53a80697 MD |
79 | char *channel_name) |
80 | { | |
f73fabfd | 81 | int ret = LTTNG_OK, have_event = 0; |
53a80697 MD |
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: | |
f73fabfd | 101 | ret = LTTNG_ERR_UND; |
53a80697 MD |
102 | goto error; |
103 | } | |
104 | ||
178191b3 DG |
105 | /* Do we have a valid event. */ |
106 | if (event && event->name[0] != '\0') { | |
53a80697 MD |
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) { | |
f73fabfd | 114 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
53a80697 MD |
115 | goto error; |
116 | } | |
117 | } | |
118 | ||
119 | /* If UST channel specified and event name, get UST event ref */ | |
120 | if (uchan && have_event) { | |
18eace3b DG |
121 | uevent = trace_ust_find_event(uchan->events, event->name, bytecode, |
122 | event->loglevel); | |
53a80697 | 123 | if (uevent == NULL) { |
f73fabfd | 124 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
53a80697 MD |
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"); | |
f73fabfd | 136 | ret = LTTNG_ERR_FATAL; /* not supported. */ |
53a80697 MD |
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) { | |
18eace3b DG |
141 | uevent = trace_ust_find_event(uchan->events, event->name, bytecode, |
142 | event->loglevel); | |
53a80697 MD |
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 | } | |
f73fabfd | 153 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
53a80697 MD |
154 | goto error; |
155 | } else if (!uchan && !have_event) { /* Add filter all events, all channels */ | |
156 | ERR("Cannot add filter to channel"); | |
f73fabfd | 157 | ret = LTTNG_ERR_FATAL; /* not supported. */ |
53a80697 MD |
158 | goto error; |
159 | } | |
160 | ||
161 | end: | |
49c336c1 | 162 | /* Must handle both local internal error and UST code. */ |
53a80697 MD |
163 | switch (ret) { |
164 | case -EEXIST: | |
49c336c1 | 165 | case -LTTNG_UST_ERR_EXIST: |
f73fabfd | 166 | ret = LTTNG_ERR_FILTER_EXIST; |
53a80697 MD |
167 | break; |
168 | case -ENOMEM: | |
f73fabfd | 169 | ret = LTTNG_ERR_FATAL; |
53a80697 MD |
170 | break; |
171 | case -EINVAL: | |
49c336c1 | 172 | case -LTTNG_UST_ERR_INVAL: |
f73fabfd | 173 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
174 | break; |
175 | case -ENOSYS: | |
49c336c1 | 176 | case -LTTNG_UST_ERR_NOSYS: |
f73fabfd | 177 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
53a80697 MD |
178 | break; |
179 | default: | |
f73fabfd | 180 | ret = LTTNG_OK; |
53a80697 MD |
181 | break; |
182 | } | |
183 | ||
184 | error: | |
185 | return ret; | |
186 | } |