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; only version 2
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.
28 #include "libkernelctl.h"
29 #include "kernel-ctl.h"
32 * kernel_add_channel_context
34 * Add context on a kernel channel.
36 int kernel_add_channel_context(struct ltt_kernel_channel
*chan
,
37 struct lttng_kernel_context
*ctx
)
41 DBG("Adding context to channel %s", chan
->channel
->name
);
42 ret
= kernctl_add_context(chan
->fd
, ctx
);
44 perror("add context ioctl");
48 chan
->ctx
= malloc(sizeof(struct lttng_kernel_context
));
49 if (chan
->ctx
== NULL
) {
50 perror("malloc event context");
54 memcpy(chan
->ctx
, ctx
, sizeof(struct lttng_kernel_context
));
63 * kernel_add_event_context
65 * Add context on a kernel event.
67 int kernel_add_event_context(struct ltt_kernel_event
*event
,
68 struct lttng_kernel_context
*ctx
)
72 DBG("Adding context to event %s", event
->event
->name
);
73 ret
= kernctl_add_context(event
->fd
, ctx
);
75 perror("add context ioctl");
79 event
->ctx
= malloc(sizeof(struct lttng_kernel_context
));
80 if (event
->ctx
== NULL
) {
81 perror("malloc event context");
85 memcpy(event
->ctx
, ctx
, sizeof(struct lttng_kernel_context
));
94 * kernel_create_session
96 * Create a new kernel session, register it to the kernel tracer and add it to
97 * the session daemon session.
99 int kernel_create_session(struct ltt_session
*session
, int tracer_fd
)
102 struct ltt_kernel_session
*lks
;
104 /* Allocate data structure */
105 lks
= trace_create_kernel_session();
111 /* Kernel tracer session creation */
112 ret
= kernctl_create_session(tracer_fd
);
114 perror("ioctl kernel create session");
119 /* Prevent fd duplication after execlp() */
120 ret
= fcntl(lks
->fd
, F_SETFD
, FD_CLOEXEC
);
122 perror("fcntl session fd");
125 lks
->kconsumer_fds_sent
= 0;
126 session
->kernel_session
= lks
;
128 DBG("Kernel session created (fd: %d)", lks
->fd
);
137 * kernel_create_channel
139 * Create a kernel channel, register it to the kernel tracer and add it to the
142 int kernel_create_channel(struct ltt_kernel_session
*session
, struct lttng_channel
*chan
, char *path
)
145 struct ltt_kernel_channel
*lkc
;
147 /* Allocate kernel channel */
148 lkc
= trace_create_kernel_channel(chan
, path
);
153 /* Kernel tracer channel creation */
154 ret
= kernctl_create_channel(session
->fd
, &lkc
->channel
->attr
);
156 perror("ioctl kernel create channel");
160 /* Setup the channel fd */
162 /* Prevent fd duplication after execlp() */
163 ret
= fcntl(lkc
->fd
, F_SETFD
, FD_CLOEXEC
);
165 perror("fcntl session fd");
168 /* Add channel to session */
169 cds_list_add(&lkc
->list
, &session
->channel_list
.head
);
170 session
->channel_count
++;
172 DBG("Kernel channel %s created (fd: %d and path: %s)",
173 lkc
->channel
->name
, lkc
->fd
, lkc
->pathname
);
182 * kernel_create_event
184 * Create a kernel event, enable it to the kernel tracer and add it to the
185 * channel event list of the kernel session.
187 int kernel_create_event(struct lttng_event
*ev
, struct ltt_kernel_channel
*channel
)
190 struct ltt_kernel_event
*event
;
192 event
= trace_create_kernel_event(ev
);
197 ret
= kernctl_create_event(channel
->fd
, event
->event
);
199 perror("create event ioctl");
204 /* Prevent fd duplication after execlp() */
205 ret
= fcntl(event
->fd
, F_SETFD
, FD_CLOEXEC
);
207 perror("fcntl session fd");
210 /* Add event to event list */
211 cds_list_add(&event
->list
, &channel
->events_list
.head
);
212 DBG("Event %s created (fd: %d)", ev
->name
, event
->fd
);
223 * kernel_disable_channel
225 * Disable a kernel channel.
227 int kernel_disable_channel(struct ltt_kernel_channel
*chan
)
231 ret
= kernctl_disable(chan
->fd
);
233 perror("disable chan ioctl");
239 DBG("Kernel channel %s disabled (fd: %d)", chan
->channel
->name
, chan
->fd
);
248 * kernel_enable_channel
250 * Enable a kernel channel.
252 int kernel_enable_channel(struct ltt_kernel_channel
*chan
)
256 ret
= kernctl_enable(chan
->fd
);
258 perror("enable chan ioctl");
264 DBG("Kernel channel %s enabled (fd: %d)", chan
->channel
->name
, chan
->fd
);
273 * kernel_enable_event
275 * Enable a kernel event.
277 int kernel_enable_event(struct ltt_kernel_event
*event
)
281 ret
= kernctl_enable(event
->fd
);
283 perror("enable event ioctl");
284 if (errno
== EEXIST
) {
291 DBG("Kernel event %s enabled (fd: %d)", event
->event
->name
, event
->fd
);
300 * kernel_disable_event
302 * Disable a kernel event.
304 int kernel_disable_event(struct ltt_kernel_event
*event
)
308 ret
= kernctl_disable(event
->fd
);
310 perror("disable event ioctl");
315 DBG("Kernel event %s disabled (fd: %d)", event
->event
->name
, event
->fd
);
324 * kernel_open_metadata
326 * Create kernel metadata, open from the kernel tracer and add it to the
329 int kernel_open_metadata(struct ltt_kernel_session
*session
, char *path
)
332 struct ltt_kernel_metadata
*lkm
;
334 /* Allocate kernel metadata */
335 lkm
= trace_create_kernel_metadata(path
);
340 /* Kernel tracer metadata creation */
341 ret
= kernctl_open_metadata(session
->fd
, &lkm
->conf
->attr
);
347 /* Prevent fd duplication after execlp() */
348 ret
= fcntl(lkm
->fd
, F_SETFD
, FD_CLOEXEC
);
350 perror("fcntl session fd");
353 session
->metadata
= lkm
;
355 DBG("Kernel metadata opened (fd: %d and path: %s)", lkm
->fd
, lkm
->pathname
);
364 * kernel_start_session
366 * Start tracing session.
368 int kernel_start_session(struct ltt_kernel_session
*session
)
372 ret
= kernctl_start_session(session
->fd
);
374 perror("ioctl start session");
378 DBG("Kernel session started");
387 * kernel_wait_quiescent
389 * Make a kernel wait to make sure in-flight probe have completed.
391 void kernel_wait_quiescent(int fd
)
395 DBG("Kernel quiescent wait on %d", fd
);
397 ret
= kernctl_wait_quiescent(fd
);
399 perror("wait quiescent ioctl");
400 ERR("Kernel quiescent wait failed");
405 * kernel_metadata_flush_buffer
407 * Force flush buffer of metadata.
409 int kernel_metadata_flush_buffer(int fd
)
413 ret
= kernctl_buffer_flush(fd
);
415 ERR("Fail to flush metadata buffers %d (ret: %d", fd
, ret
);
422 * kernel_flush_buffer
424 * Force flush buffer for channel.
426 int kernel_flush_buffer(struct ltt_kernel_channel
*channel
)
429 struct ltt_kernel_stream
*stream
;
431 DBG("Flush buffer for channel %s", channel
->channel
->name
);
433 cds_list_for_each_entry(stream
, &channel
->stream_list
.head
, list
) {
434 DBG("Flushing channel stream %d", stream
->fd
);
435 ret
= kernctl_buffer_flush(stream
->fd
);
438 ERR("Fail to flush buffer for stream %d (ret: %d)",
447 * kernel_stop_session
449 * Stop tracing session.
451 int kernel_stop_session(struct ltt_kernel_session
*session
)
455 ret
= kernctl_stop_session(session
->fd
);
460 DBG("Kernel session stopped");
469 * kernel_open_channel_stream
471 * Open stream of channel, register it to the kernel tracer and add it
472 * to the stream list of the channel.
474 * Return the number of created stream. Else, a negative value.
476 int kernel_open_channel_stream(struct ltt_kernel_channel
*channel
)
479 struct ltt_kernel_stream
*lks
;
481 while ((ret
= kernctl_create_stream(channel
->fd
)) > 0) {
482 lks
= trace_create_kernel_stream();
489 /* Prevent fd duplication after execlp() */
490 ret
= fcntl(lks
->fd
, F_SETFD
, FD_CLOEXEC
);
492 perror("fcntl session fd");
495 ret
= asprintf(&lks
->pathname
, "%s/%s_%d",
496 channel
->pathname
, channel
->channel
->name
, channel
->stream_count
);
498 perror("asprintf kernel create stream");
502 /* Add stream to channe stream list */
503 cds_list_add(&lks
->list
, &channel
->stream_list
.head
);
504 channel
->stream_count
++;
506 DBG("Kernel stream %d created (fd: %d, state: %d, path: %s)",
507 channel
->stream_count
, lks
->fd
, lks
->state
, lks
->pathname
);
510 return channel
->stream_count
;
517 * kernel_open_metadata_stream
519 * Open the metadata stream and set it to the kernel session.
521 int kernel_open_metadata_stream(struct ltt_kernel_session
*session
)
525 ret
= kernctl_create_stream(session
->metadata
->fd
);
527 perror("kernel create metadata stream");
531 DBG("Kernel metadata stream created (fd: %d)", ret
);
532 session
->metadata_stream_fd
= ret
;
533 /* Prevent fd duplication after execlp() */
534 ret
= fcntl(session
->metadata_stream_fd
, F_SETFD
, FD_CLOEXEC
);
536 perror("fcntl session fd");
548 * Get the event list from the kernel tracer and return that list in the CTF
551 ssize_t
kernel_list_events(int tracer_fd
, char **list
)
554 char *buf
, *line
= NULL
;
555 size_t nb
, nbmem
, total
= 0;
559 fd
= kernctl_tracepoint_list(tracer_fd
);
561 perror("kernel tracepoint list");
565 fp
= fdopen(fd
, "r");
567 perror("kernel tracepoint list fdopen");
572 * Init memory size counter
573 * See kernel-ctl.h for explanation of this value
575 nbmem
= KERNEL_EVENT_LIST_SIZE
;
578 while ((size
= getline(&line
, &nb
, fp
)) != -1) {
579 if (total
+ size
> nbmem
) {
580 DBG("Reallocating event list from %zd to %zd bytes", nbmem
,
581 total
+ size
+ KERNEL_EVENT_LIST_SIZE
);
582 /* Adding the default size again */
583 nbmem
= total
+ size
+ KERNEL_EVENT_LIST_SIZE
;
584 buf
= realloc(buf
, nbmem
);
586 perror("realloc list events");
590 memcpy(buf
+ total
, line
, size
);
596 DBG("Kernel list events done");
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