Commit | Line | Data |
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b579acd9 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
1e307fab DG |
4 | * This program is free software; you can redistribute it and/or modify it |
5 | * under the terms of the GNU General Public License as published by the Free | |
6 | * Software Foundation; only version 2 of the License. | |
b579acd9 | 7 | * |
1e307fab DG |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
b579acd9 | 12 | * |
1e307fab DG |
13 | * You should have received a copy of the GNU General Public License along with |
14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
15 | * Place - Suite 330, Boston, MA 02111-1307, USA. | |
b579acd9 DG |
16 | */ |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #include <stdio.h> | |
20 | #include <stdlib.h> | |
21 | #include <string.h> | |
22 | #include <unistd.h> | |
54d01ffb | 23 | #include <urcu/list.h> |
1e307fab DG |
24 | |
25 | #include <lttng-sessiond-comm.h> | |
54d01ffb | 26 | #include <lttngerr.h> |
b579acd9 | 27 | |
b579acd9 | 28 | #include "context.h" |
1e307fab | 29 | #include "kernel-ctl.h" |
b579acd9 DG |
30 | |
31 | /* | |
32 | * Add kernel context to an event of a specific channel. | |
33 | */ | |
34 | static int add_kctx_to_event(struct lttng_kernel_context *kctx, | |
35 | struct ltt_kernel_channel *kchan, char *event_name) | |
36 | { | |
37 | int ret, found = 0; | |
38 | struct ltt_kernel_event *kevent; | |
39 | ||
40 | DBG("Add kernel context to event %s", event_name); | |
41 | ||
62499ad6 | 42 | kevent = trace_kernel_get_event_by_name(event_name, kchan); |
b579acd9 DG |
43 | if (kevent != NULL) { |
44 | ret = kernel_add_event_context(kevent, kctx); | |
45 | if (ret < 0) { | |
46 | goto error; | |
47 | } | |
48 | found = 1; | |
49 | } | |
50 | ||
51 | ret = found; | |
52 | ||
53 | error: | |
54 | return ret; | |
55 | } | |
56 | ||
57 | /* | |
58 | * Add kernel context to all channel. | |
59 | * | |
60 | * If event_name is specified, add context to event instead. | |
61 | */ | |
62 | static int add_kctx_all_channels(struct ltt_kernel_session *ksession, | |
63 | struct lttng_kernel_context *kctx, char *event_name) | |
64 | { | |
65 | int ret, no_event = 0, found = 0; | |
66 | struct ltt_kernel_channel *kchan; | |
67 | ||
68 | if (strlen(event_name) == 0) { | |
69 | no_event = 1; | |
70 | } | |
71 | ||
72 | DBG("Adding kernel context to all channels (event: %s)", event_name); | |
73 | ||
74 | /* Go over all channels */ | |
75 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
76 | if (no_event) { | |
77 | ret = kernel_add_channel_context(kchan, kctx); | |
78 | if (ret < 0) { | |
79 | ret = LTTCOMM_KERN_CONTEXT_FAIL; | |
80 | goto error; | |
81 | } | |
82 | } else { | |
83 | ret = add_kctx_to_event(kctx, kchan, event_name); | |
84 | if (ret < 0) { | |
85 | ret = LTTCOMM_KERN_CONTEXT_FAIL; | |
86 | goto error; | |
87 | } else if (ret == 1) { | |
88 | /* Event found and context added */ | |
89 | found = 1; | |
90 | break; | |
91 | } | |
92 | } | |
93 | } | |
94 | ||
95 | if (!found && !no_event) { | |
96 | ret = LTTCOMM_NO_EVENT; | |
97 | goto error; | |
98 | } | |
99 | ||
100 | ret = LTTCOMM_OK; | |
101 | ||
102 | error: | |
103 | return ret; | |
104 | } | |
105 | ||
106 | /* | |
107 | * Add kernel context to a specific channel. | |
108 | * | |
109 | * If event_name is specified, add context to that event. | |
110 | */ | |
111 | static int add_kctx_to_channel(struct lttng_kernel_context *kctx, | |
112 | struct ltt_kernel_channel *kchan, char *event_name) | |
113 | { | |
114 | int ret, no_event = 0, found = 0; | |
115 | ||
116 | if (strlen(event_name) == 0) { | |
117 | no_event = 1; | |
118 | } | |
119 | ||
120 | DBG("Add kernel context to channel '%s', event '%s'", | |
121 | kchan->channel->name, event_name); | |
122 | ||
123 | if (no_event) { | |
124 | ret = kernel_add_channel_context(kchan, kctx); | |
125 | if (ret < 0) { | |
126 | ret = LTTCOMM_KERN_CONTEXT_FAIL; | |
127 | goto error; | |
128 | } | |
129 | } else { | |
130 | ret = add_kctx_to_event(kctx, kchan, event_name); | |
131 | if (ret < 0) { | |
132 | ret = LTTCOMM_KERN_CONTEXT_FAIL; | |
133 | goto error; | |
134 | } else if (ret == 1) { | |
135 | /* Event found and context added */ | |
136 | found = 1; | |
137 | } | |
138 | } | |
139 | ||
140 | if (!found && !no_event) { | |
141 | ret = LTTCOMM_NO_EVENT; | |
142 | goto error; | |
143 | } | |
144 | ||
145 | ret = LTTCOMM_OK; | |
146 | ||
147 | error: | |
148 | return ret; | |
149 | } | |
150 | ||
151 | /* | |
152 | * Add kernel context to tracer. | |
153 | */ | |
54d01ffb DG |
154 | int context_kernel_add(struct ltt_kernel_session *ksession, |
155 | struct lttng_event_context *ctx, char *event_name, | |
b579acd9 DG |
156 | char *channel_name) |
157 | { | |
158 | int ret; | |
159 | struct ltt_kernel_channel *kchan; | |
54d01ffb DG |
160 | struct lttng_kernel_context kctx; |
161 | ||
162 | /* Setup kernel context structure */ | |
163 | kctx.ctx = ctx->ctx; | |
164 | kctx.u.perf_counter.type = ctx->u.perf_counter.type; | |
165 | kctx.u.perf_counter.config = ctx->u.perf_counter.config; | |
166 | strncpy(kctx.u.perf_counter.name, ctx->u.perf_counter.name, | |
167 | LTTNG_SYMBOL_NAME_LEN); | |
168 | kctx.u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
b579acd9 DG |
169 | |
170 | if (strlen(channel_name) == 0) { | |
54d01ffb | 171 | ret = add_kctx_all_channels(ksession, &kctx, event_name); |
b579acd9 DG |
172 | if (ret != LTTCOMM_OK) { |
173 | goto error; | |
174 | } | |
175 | } else { | |
176 | /* Get kernel channel */ | |
62499ad6 | 177 | kchan = trace_kernel_get_channel_by_name(channel_name, ksession); |
b579acd9 DG |
178 | if (kchan == NULL) { |
179 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
180 | goto error; | |
181 | } | |
182 | ||
54d01ffb | 183 | ret = add_kctx_to_channel(&kctx, kchan, event_name); |
b579acd9 DG |
184 | if (ret != LTTCOMM_OK) { |
185 | goto error; | |
186 | } | |
187 | } | |
188 | ||
189 | ret = LTTCOMM_OK; | |
190 | ||
191 | error: | |
192 | return ret; | |
193 | } |