5c452ca924988e77694e0fc26ba3a242a8381886
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 "kernelctl.h"
29 #include "kernel-ctl.h"
32 * Add context on a kernel channel.
34 int kernel_add_channel_context(struct ltt_kernel_channel
*chan
,
35 struct lttng_kernel_context
*ctx
)
39 DBG("Adding context to channel %s", chan
->channel
->name
);
40 ret
= kernctl_add_context(chan
->fd
, ctx
);
42 if (errno
!= EEXIST
) {
43 perror("add context ioctl");
45 /* If EEXIST, we just ignore the error */
51 chan
->ctx
= malloc(sizeof(struct lttng_kernel_context
));
52 if (chan
->ctx
== NULL
) {
53 perror("malloc event context");
57 memcpy(chan
->ctx
, ctx
, sizeof(struct lttng_kernel_context
));
66 * Add context on a kernel event.
68 int kernel_add_event_context(struct ltt_kernel_event
*event
,
69 struct lttng_kernel_context
*ctx
)
73 DBG("Adding context to event %s", event
->event
->name
);
74 ret
= kernctl_add_context(event
->fd
, ctx
);
76 perror("add context ioctl");
80 event
->ctx
= malloc(sizeof(struct lttng_kernel_context
));
81 if (event
->ctx
== NULL
) {
82 perror("malloc event context");
86 memcpy(event
->ctx
, ctx
, sizeof(struct lttng_kernel_context
));
95 * Create a new kernel session, register it to the kernel tracer and add it to
96 * the session daemon session.
98 int kernel_create_session(struct ltt_session
*session
, int tracer_fd
)
101 struct ltt_kernel_session
*lks
;
103 /* Allocate data structure */
104 lks
= trace_create_kernel_session();
110 /* Kernel tracer session creation */
111 ret
= kernctl_create_session(tracer_fd
);
113 perror("ioctl kernel create session");
118 /* Prevent fd duplication after execlp() */
119 ret
= fcntl(lks
->fd
, F_SETFD
, FD_CLOEXEC
);
121 perror("fcntl session fd");
124 lks
->kconsumer_fds_sent
= 0;
125 session
->kernel_session
= lks
;
127 DBG("Kernel session created (fd: %d)", lks
->fd
);
136 * Create a kernel channel, register it to the kernel tracer and add it to the
139 int kernel_create_channel(struct ltt_kernel_session
*session
,
140 struct lttng_channel
*chan
, char *path
)
143 struct ltt_kernel_channel
*lkc
;
145 /* Allocate kernel channel */
146 lkc
= trace_create_kernel_channel(chan
, path
);
151 /* Kernel tracer channel creation */
152 ret
= kernctl_create_channel(session
->fd
, &lkc
->channel
->attr
);
154 perror("ioctl kernel create channel");
158 /* Setup the channel fd */
160 /* Prevent fd duplication after execlp() */
161 ret
= fcntl(lkc
->fd
, F_SETFD
, FD_CLOEXEC
);
163 perror("fcntl session fd");
166 /* Add channel to session */
167 cds_list_add(&lkc
->list
, &session
->channel_list
.head
);
168 session
->channel_count
++;
170 DBG("Kernel channel %s created (fd: %d and path: %s)",
171 lkc
->channel
->name
, lkc
->fd
, lkc
->pathname
);
180 * Create a kernel event, enable it to the kernel tracer and add it to the
181 * channel event list of the kernel session.
183 int kernel_create_event(struct lttng_event
*ev
,
184 struct ltt_kernel_channel
*channel
)
187 struct ltt_kernel_event
*event
;
189 event
= trace_create_kernel_event(ev
);
194 ret
= kernctl_create_event(channel
->fd
, event
->event
);
196 perror("create event ioctl");
201 /* Prevent fd duplication after execlp() */
202 ret
= fcntl(event
->fd
, F_SETFD
, FD_CLOEXEC
);
204 perror("fcntl session fd");
207 /* Add event to event list */
208 cds_list_add(&event
->list
, &channel
->events_list
.head
);
209 channel
->event_count
++;
211 DBG("Event %s created (fd: %d)", ev
->name
, event
->fd
);
222 * Disable a kernel channel.
224 int kernel_disable_channel(struct ltt_kernel_channel
*chan
)
228 ret
= kernctl_disable(chan
->fd
);
230 perror("disable chan ioctl");
236 DBG("Kernel channel %s disabled (fd: %d)", chan
->channel
->name
, chan
->fd
);
245 * Enable a kernel channel.
247 int kernel_enable_channel(struct ltt_kernel_channel
*chan
)
251 ret
= kernctl_enable(chan
->fd
);
253 perror("enable chan ioctl");
259 DBG("Kernel channel %s enabled (fd: %d)", chan
->channel
->name
, chan
->fd
);
268 * Enable a kernel event.
270 int kernel_enable_event(struct ltt_kernel_event
*event
)
274 ret
= kernctl_enable(event
->fd
);
276 perror("enable event ioctl");
277 if (errno
== EEXIST
) {
284 DBG("Kernel event %s enabled (fd: %d)", event
->event
->name
, event
->fd
);
293 * Disable a kernel event.
295 int kernel_disable_event(struct ltt_kernel_event
*event
)
299 ret
= kernctl_disable(event
->fd
);
301 perror("disable event ioctl");
306 DBG("Kernel event %s disabled (fd: %d)", event
->event
->name
, event
->fd
);
315 * Create kernel metadata, open from the kernel tracer and add it to the
318 int kernel_open_metadata(struct ltt_kernel_session
*session
, char *path
)
321 struct ltt_kernel_metadata
*lkm
;
323 /* Allocate kernel metadata */
324 lkm
= trace_create_kernel_metadata(path
);
329 /* Kernel tracer metadata creation */
330 ret
= kernctl_open_metadata(session
->fd
, &lkm
->conf
->attr
);
336 /* Prevent fd duplication after execlp() */
337 ret
= fcntl(lkm
->fd
, F_SETFD
, FD_CLOEXEC
);
339 perror("fcntl session fd");
342 session
->metadata
= lkm
;
344 DBG("Kernel metadata opened (fd: %d and path: %s)", lkm
->fd
, lkm
->pathname
);
353 * Start tracing session.
355 int kernel_start_session(struct ltt_kernel_session
*session
)
359 ret
= kernctl_start_session(session
->fd
);
361 perror("ioctl start session");
365 DBG("Kernel session started");
374 * Make a kernel wait to make sure in-flight probe have completed.
376 void kernel_wait_quiescent(int fd
)
380 DBG("Kernel quiescent wait on %d", fd
);
382 ret
= kernctl_wait_quiescent(fd
);
384 perror("wait quiescent ioctl");
385 ERR("Kernel quiescent wait failed");
392 int kernel_calibrate(int fd
, struct lttng_kernel_calibrate
*calibrate
)
396 ret
= kernctl_calibrate(fd
, calibrate
);
398 perror("calibrate ioctl");
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 * Force flush buffer for channel.
424 int kernel_flush_buffer(struct ltt_kernel_channel
*channel
)
427 struct ltt_kernel_stream
*stream
;
429 DBG("Flush buffer for channel %s", channel
->channel
->name
);
431 cds_list_for_each_entry(stream
, &channel
->stream_list
.head
, list
) {
432 DBG("Flushing channel stream %d", stream
->fd
);
433 ret
= kernctl_buffer_flush(stream
->fd
);
436 ERR("Fail to flush buffer for stream %d (ret: %d)",
445 * Stop tracing session.
447 int kernel_stop_session(struct ltt_kernel_session
*session
)
451 ret
= kernctl_stop_session(session
->fd
);
456 DBG("Kernel session stopped");
465 * Open stream of channel, register it to the kernel tracer and add it
466 * to the stream list of the channel.
468 * Return the number of created stream. Else, a negative value.
470 int kernel_open_channel_stream(struct ltt_kernel_channel
*channel
)
473 struct ltt_kernel_stream
*lks
;
475 while ((ret
= kernctl_create_stream(channel
->fd
)) > 0) {
476 lks
= trace_create_kernel_stream();
483 /* Prevent fd duplication after execlp() */
484 ret
= fcntl(lks
->fd
, F_SETFD
, FD_CLOEXEC
);
486 perror("fcntl session fd");
489 ret
= asprintf(&lks
->pathname
, "%s/%s_%d",
490 channel
->pathname
, channel
->channel
->name
, channel
->stream_count
);
492 perror("asprintf kernel create stream");
496 /* Add stream to channe stream list */
497 cds_list_add(&lks
->list
, &channel
->stream_list
.head
);
498 channel
->stream_count
++;
500 DBG("Kernel stream %d created (fd: %d, state: %d, path: %s)",
501 channel
->stream_count
, lks
->fd
, lks
->state
, lks
->pathname
);
504 return channel
->stream_count
;
511 * Open the metadata stream and set it to the kernel session.
513 int kernel_open_metadata_stream(struct ltt_kernel_session
*session
)
517 ret
= kernctl_create_stream(session
->metadata
->fd
);
519 perror("kernel create metadata stream");
523 DBG("Kernel metadata stream created (fd: %d)", ret
);
524 session
->metadata_stream_fd
= ret
;
525 /* Prevent fd duplication after execlp() */
526 ret
= fcntl(session
->metadata_stream_fd
, F_SETFD
, FD_CLOEXEC
);
528 perror("fcntl session fd");
538 * Get the event list from the kernel tracer and return the number of elements.
540 ssize_t
kernel_list_events(int tracer_fd
, struct lttng_event
**events
)
544 size_t nbmem
, count
= 0;
547 struct lttng_event
*elist
;
549 fd
= kernctl_tracepoint_list(tracer_fd
);
551 perror("kernel tracepoint list");
555 fp
= fdopen(fd
, "r");
557 perror("kernel tracepoint list fdopen");
562 * Init memory size counter
563 * See kernel-ctl.h for explanation of this value
565 nbmem
= KERNEL_EVENT_LIST_SIZE
;
566 elist
= malloc(sizeof(struct lttng_event
) * nbmem
);
568 while ((size
= fscanf(fp
, "event { name = %m[^;]; };%n\n", &event
, &pos
)) == 1) {
570 DBG("Reallocating event list from %zu to %zu bytes", nbmem
,
571 nbmem
+ KERNEL_EVENT_LIST_SIZE
);
572 /* Adding the default size again */
573 nbmem
+= KERNEL_EVENT_LIST_SIZE
;
574 elist
= realloc(elist
, nbmem
);
576 perror("realloc list events");
581 strncpy(elist
[count
].name
, event
, LTTNG_SYMBOL_NAME_LEN
);
582 elist
[count
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
587 DBG("Kernel list events done (%zu events)", count
);
589 fclose(fp
); /* closes both fp and fd */
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