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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; | |
49 | ||
50 | switch (domain) { | |
51 | case LTTNG_DOMAIN_UST: | |
52 | ret = ust_app_set_filter_event_glb(usess, uchan, uevent, | |
53 | bytecode); | |
54 | if (ret < 0) { | |
55 | goto error; | |
56 | } | |
57 | break; | |
58 | default: | |
59 | ret = -ENOSYS; | |
60 | goto error; | |
61 | } | |
62 | ||
63 | DBG("Filter UST added to event %s",uevent->attr.name); | |
64 | ||
65 | return 0; | |
66 | ||
67 | error: | |
68 | free(bytecode); | |
69 | return ret; | |
70 | } | |
71 | ||
72 | /* | |
73 | * Add UST context to tracer. | |
74 | */ | |
75 | int filter_ust_set(struct ltt_ust_session *usess, int domain, | |
76 | struct lttng_filter_bytecode *bytecode, char *event_name, | |
77 | char *channel_name) | |
78 | { | |
79 | int ret = LTTCOMM_OK, have_event = 0; | |
80 | struct lttng_ht_iter iter; | |
81 | struct lttng_ht *chan_ht; | |
82 | struct ltt_ust_channel *uchan = NULL; | |
83 | struct ltt_ust_event *uevent = NULL; | |
84 | ||
85 | /* | |
86 | * Define which channel's hashtable to use from the domain or quit if | |
87 | * unknown domain. | |
88 | */ | |
89 | switch (domain) { | |
90 | case LTTNG_DOMAIN_UST: | |
91 | chan_ht = usess->domain_global.channels; | |
92 | break; | |
93 | #if 0 | |
94 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
95 | case LTTNG_DOMAIN_UST_PID: | |
96 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
97 | #endif | |
98 | default: | |
99 | ret = LTTCOMM_UND; | |
100 | goto error; | |
101 | } | |
102 | ||
103 | /* Do we have an event name */ | |
104 | if (strlen(event_name) != 0) { | |
105 | have_event = 1; | |
106 | } | |
107 | ||
108 | /* Get UST channel if defined */ | |
109 | if (strlen(channel_name) != 0) { | |
110 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
111 | if (uchan == NULL) { | |
112 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
113 | goto error; | |
114 | } | |
115 | } | |
116 | ||
117 | /* If UST channel specified and event name, get UST event ref */ | |
118 | if (uchan && have_event) { | |
119 | uevent = trace_ust_find_event_by_name(uchan->events, event_name); | |
120 | if (uevent == NULL) { | |
121 | ret = LTTCOMM_UST_EVENT_NOT_FOUND; | |
122 | goto error; | |
123 | } | |
124 | } | |
125 | ||
126 | /* At this point, we have 4 possibilities */ | |
127 | ||
128 | if (uchan && uevent) { /* Add filter to event in channel */ | |
129 | ret = add_ufilter_to_event(usess, domain, uchan, uevent, | |
130 | bytecode); | |
131 | } else if (uchan && !have_event) { /* Add filter to channel */ | |
132 | ERR("Cannot add filter to channel"); | |
133 | ret = LTTCOMM_FATAL; /* not supported. */ | |
134 | goto error; | |
135 | } else if (!uchan && have_event) { /* Add filter to event */ | |
136 | /* Add context to event without having the channel name */ | |
137 | cds_lfht_for_each_entry(chan_ht->ht, &iter.iter, uchan, node.node) { | |
138 | uevent = trace_ust_find_event_by_name(uchan->events, event_name); | |
139 | if (uevent != NULL) { | |
140 | ret = add_ufilter_to_event(usess, domain, uchan, uevent, bytecode); | |
141 | /* | |
142 | * LTTng UST does not allowed the same event to be registered | |
143 | * multiple time in different or the same channel. So, if we | |
144 | * found our event, we stop. | |
145 | */ | |
146 | goto end; | |
147 | } | |
148 | } | |
149 | ret = LTTCOMM_UST_EVENT_NOT_FOUND; | |
150 | goto error; | |
151 | } else if (!uchan && !have_event) { /* Add filter all events, all channels */ | |
152 | ERR("Cannot add filter to channel"); | |
153 | ret = LTTCOMM_FATAL; /* not supported. */ | |
154 | goto error; | |
155 | } | |
156 | ||
157 | end: | |
158 | switch (ret) { | |
159 | case -EEXIST: | |
160 | ret = LTTCOMM_FILTER_EXIST; | |
161 | break; | |
162 | case -ENOMEM: | |
163 | ret = LTTCOMM_FATAL; | |
164 | break; | |
165 | case -EINVAL: | |
166 | ret = LTTCOMM_FILTER_INVAL; | |
167 | break; | |
168 | case -ENOSYS: | |
169 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
170 | break; | |
171 | default: | |
172 | ret = LTTCOMM_OK; | |
173 | break; | |
174 | } | |
175 | ||
176 | error: | |
177 | return ret; | |
178 | } |