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2d78951a MD |
1 | /* |
2 | * lttng-filter.c | |
3 | * | |
4 | * LTTng UST filter code. | |
5 | * | |
6 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
7 | * | |
8 | * This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; only | |
11 | * version 2.1 of the License. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | */ | |
22 | ||
23 | #include <errno.h> | |
24 | #include <stdio.h> | |
25 | #include <helper.h> | |
26 | #include <lttng/ust-events.h> | |
27 | ||
28 | static | |
29 | int lttng_filter_interpret_bytecode(void *filter_data, | |
30 | const char *filter_stack_data) | |
31 | { | |
32 | /* TODO */ | |
33 | return 0; | |
34 | } | |
35 | ||
36 | static | |
37 | int _lttng_filter_event_link_bytecode(struct ltt_event *event, | |
38 | struct lttng_ust_filter_bytecode *filter_bytecode) | |
39 | { | |
40 | if (!filter_bytecode) | |
41 | return 0; | |
42 | ||
43 | event->filter = lttng_filter_interpret_bytecode; | |
44 | /* TODO */ | |
45 | /* event->filter_data = ; */ | |
46 | return 0; | |
47 | } | |
48 | ||
49 | void lttng_filter_event_link_bytecode(struct ltt_event *event, | |
50 | struct lttng_ust_filter_bytecode *filter_bytecode) | |
51 | { | |
52 | int ret; | |
53 | ||
54 | ret = _lttng_filter_event_link_bytecode(event, event->filter_bytecode); | |
55 | if (ret) { | |
56 | fprintf(stderr, "[lttng filter] error linking event bytecode\n"); | |
57 | } | |
58 | } | |
59 | ||
60 | /* | |
61 | * Link bytecode to all events for a wildcard. Skips events that already | |
62 | * have a bytecode linked. | |
63 | * We do not set each event's filter_bytecode field, because they do not | |
64 | * own the filter_bytecode: the wildcard owns it. | |
65 | */ | |
66 | void lttng_filter_wildcard_link_bytecode(struct session_wildcard *wildcard) | |
67 | { | |
68 | struct ltt_event *event; | |
69 | int ret; | |
70 | ||
71 | if (!wildcard->filter_bytecode) | |
72 | return; | |
73 | ||
74 | cds_list_for_each_entry(event, &wildcard->events, wildcard_list) { | |
75 | if (event->filter) | |
76 | continue; | |
77 | ret = _lttng_filter_event_link_bytecode(event, | |
78 | wildcard->filter_bytecode); | |
79 | if (ret) { | |
80 | fprintf(stderr, "[lttng filter] error linking wildcard bytecode\n"); | |
81 | } | |
82 | ||
83 | } | |
84 | return; | |
85 | } | |
86 | ||
87 | /* | |
88 | * Need to attach filter to an event before starting tracing for the | |
89 | * session. | |
90 | */ | |
91 | int lttng_filter_event_attach_bytecode(struct ltt_event *event, | |
92 | struct lttng_ust_filter_bytecode *filter_bytecode) | |
93 | { | |
94 | struct lttng_ust_filter_bytecode *bc; | |
95 | ||
96 | if (event->chan->session->been_active) | |
97 | return -EPERM; | |
98 | if (event->filter_bytecode) | |
99 | return -EEXIST; | |
100 | ||
101 | bc = zmalloc(sizeof(struct lttng_ust_filter_bytecode) | |
102 | + filter_bytecode->len); | |
103 | if (!bc) | |
104 | return -ENOMEM; | |
105 | event->filter_bytecode = bc; | |
106 | return 0; | |
107 | } | |
108 | ||
109 | /* | |
110 | * Need to attach filter to a wildcard before starting tracing for the | |
111 | * session. | |
112 | */ | |
113 | int lttng_filter_wildcard_attach_bytecode(struct session_wildcard *wildcard, | |
114 | struct lttng_ust_filter_bytecode *filter_bytecode) | |
115 | { | |
116 | struct lttng_ust_filter_bytecode *bc; | |
117 | ||
118 | if (wildcard->chan->session->been_active) | |
119 | return -EPERM; | |
120 | if (wildcard->filter_bytecode) | |
121 | return -EEXIST; | |
122 | ||
123 | bc = zmalloc(sizeof(struct lttng_ust_filter_bytecode) | |
124 | + filter_bytecode->len); | |
125 | if (!bc) | |
126 | return -ENOMEM; | |
127 | wildcard->filter_bytecode = bc; | |
128 | return 0; | |
129 | } |