2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
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.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 #include "ltt-sessiond.h"
28 #include "libkernelctl.h"
29 #include "kernel-ctl.h"
32 * kernel_create_session
34 * Create a new kernel session, register it to the kernel tracer and add it to
35 * the session daemon session.
37 int kernel_create_session(struct ltt_session
*session
, int tracer_fd
)
40 struct ltt_kernel_session
*lks
;
42 /* Allocate data structure */
43 lks
= trace_create_kernel_session();
49 /* Kernel tracer session creation */
50 ret
= kernctl_create_session(tracer_fd
);
52 perror("ioctl kernel create session");
57 session
->kernel_session
= lks
;
58 session
->kern_session_count
++;
60 DBG("Kernel session created (fd: %d)", lks
->fd
);
69 * kernel_create_channel
71 * Create a kernel channel, register it to the kernel tracer and add it to the
74 int kernel_create_channel(struct ltt_kernel_session
*session
)
77 struct ltt_kernel_channel
*lkc
;
79 /* Allocate kernel channel */
80 lkc
= trace_create_kernel_channel();
85 /* Kernel tracer channel creation */
86 ret
= kernctl_create_channel(session
->fd
, lkc
->channel
);
88 perror("ioctl kernel create channel");
92 /* Setup the channel fd */
94 /* Add channel to session */
95 cds_list_add(&lkc
->list
, &session
->channel_list
.head
);
96 session
->channel_count
++;
98 DBG("Kernel channel created (fd: %d and path: %s)", lkc
->fd
, lkc
->pathname
);
107 * kernel_enable_event
109 * Create a kernel event, enable it to the kernel tracer and add it to the
110 * channel event list of the kernel session.
112 int kernel_enable_event(struct ltt_kernel_session
*session
, char *name
)
115 struct ltt_kernel_channel
*chan
;
116 struct ltt_kernel_event
*event
;
118 event
= trace_create_kernel_event(name
, LTTNG_KERNEL_TRACEPOINTS
);
123 cds_list_for_each_entry(chan
, &session
->channel_list
.head
, list
) {
124 ret
= kernctl_create_event(chan
->fd
, event
->event
);
126 ERR("Unable to enable event %s", name
);
131 /* Add event to event list */
132 cds_list_add(&event
->list
, &chan
->events_list
.head
);
133 DBG("Event %s enabled (fd: %d)", name
, event
->fd
);
143 * kernel_open_metadata
145 * Create kernel metadata, open from the kernel tracer and add it to the
148 int kernel_open_metadata(struct ltt_kernel_session
*session
)
151 struct ltt_kernel_metadata
*lkm
;
153 /* Allocate kernel metadata */
154 lkm
= trace_create_kernel_metadata();
159 /* Kernel tracer metadata creation */
160 ret
= kernctl_open_metadata(session
->fd
, lkm
->conf
);
166 session
->metadata
= lkm
;
168 DBG("Kernel metadata opened (fd: %d and path: %s)", lkm
->fd
, lkm
->pathname
);
177 * kernel_start_session
179 * Start tracing session.
181 int kernel_start_session(struct ltt_kernel_session
*session
)
185 ret
= kernctl_start_session(session
->fd
);
190 DBG("Kernel session started");
199 * kernel_stop_session
201 * Stop tracing session.
203 int kernel_stop_session(struct ltt_kernel_session
*session
)
207 ret
= kernctl_stop_session(session
->fd
);
212 DBG("Kernel session stopped");
221 * kernel_create_channel_stream
223 * Create a stream for a channel, register it to the kernel tracer and add it
224 * to the stream list of the channel.
226 * Return the number of created stream. Else, a negative value.
228 int kernel_create_channel_stream(struct ltt_kernel_channel
*channel
)
231 struct ltt_kernel_stream
*lks
;
233 while ((ret
= kernctl_create_stream(channel
->fd
)) > 0) {
234 lks
= trace_create_kernel_stream();
241 ret
= asprintf(&lks
->pathname
, "%s/trace_%d",
242 channel
->pathname
, channel
->stream_count
);
244 perror("asprintf kernel create stream");
248 /* Add stream to channe stream list */
249 cds_list_add(&lks
->list
, &channel
->stream_list
.head
);
250 channel
->stream_count
++;
252 DBG("Kernel stream %d created (fd: %d, state: %d, path: %s)",
253 channel
->stream_count
, lks
->fd
, lks
->state
, lks
->pathname
);
256 return channel
->stream_count
;
263 * kernel_create_metadata_stream
265 * Create the metadata stream and set it to the kernel session.
267 int kernel_create_metadata_stream(struct ltt_kernel_session
*session
)
271 ret
= kernctl_create_stream(session
->metadata
->fd
);
273 perror("kernel create metadata stream");
277 DBG("Kernel metadata stream created (fd: %d)", ret
);
278 session
->metadata_stream_fd
= ret
;
289 * Get the event list from the kernel tracer and return that list in the CTF
292 ssize_t
kernel_list_events(int tracer_fd
, char **list
)
295 char *buf
, *line
= NULL
;
296 size_t nb
, nbmem
, total
= 0;
300 fd
= kernctl_tracepoint_list(tracer_fd
);
302 perror("kernel tracepoint list");
306 fp
= fdopen(fd
, "r");
308 perror("kernel tracepoint list fdopen");
313 * Init memory size counter
314 * See kernel-ctl.h for explanation of this value
316 nbmem
= KERNEL_EVENT_LIST_SIZE
;
319 while ((size
= getline(&line
, &nb
, fp
)) != -1) {
320 if (total
+ size
> nbmem
) {
321 DBG("Reallocating event list from %ld to %ld bytes", nbmem
,
322 total
+ size
+ KERNEL_EVENT_LIST_SIZE
);
323 /* Adding the default size again */
324 nbmem
= total
+ size
+ KERNEL_EVENT_LIST_SIZE
;
325 buf
= realloc(buf
, nbmem
);
327 perror("realloc list events");
331 memcpy(buf
+ total
, line
, size
);
337 DBG("Kernel list events done");
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