Commit | Line | Data |
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3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * | |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
3bd1e081 MD |
8 | * |
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. | |
13 | * | |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <assert.h> | |
f02e1e8a | 21 | #include <lttng/ust-ctl.h> |
3bd1e081 MD |
22 | #include <poll.h> |
23 | #include <pthread.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <sys/mman.h> | |
27 | #include <sys/socket.h> | |
dbb5dfe6 | 28 | #include <sys/stat.h> |
3bd1e081 | 29 | #include <sys/types.h> |
77c7c900 | 30 | #include <inttypes.h> |
3bd1e081 | 31 | #include <unistd.h> |
0857097f | 32 | |
990570ed | 33 | #include <common/common.h> |
10a8a223 | 34 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 35 | #include <common/relayd/relayd.h> |
dbb5dfe6 | 36 | #include <common/compat/fcntl.h> |
10a8a223 DG |
37 | |
38 | #include "ust-consumer.h" | |
3bd1e081 MD |
39 | |
40 | extern struct lttng_consumer_global_data consumer_data; | |
41 | extern int consumer_poll_timeout; | |
42 | extern volatile int consumer_quit; | |
43 | ||
44 | /* | |
f02e1e8a DG |
45 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be |
46 | * compiled out, we isolate it in this library. | |
3bd1e081 | 47 | */ |
f02e1e8a DG |
48 | int lttng_ustctl_get_mmap_read_offset(struct lttng_ust_shm_handle *handle, |
49 | struct lttng_ust_lib_ring_buffer *buf, unsigned long *off) | |
3bd1e081 | 50 | { |
f02e1e8a DG |
51 | return ustctl_get_mmap_read_offset(handle, buf, off); |
52 | }; | |
3bd1e081 MD |
53 | |
54 | /* | |
55 | * Take a snapshot for a specific fd | |
56 | * | |
57 | * Returns 0 on success, < 0 on error | |
58 | */ | |
59 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_local_data *ctx, | |
60 | struct lttng_consumer_stream *stream) | |
61 | { | |
62 | int ret = 0; | |
63 | ||
64 | ret = ustctl_snapshot(stream->chan->handle, stream->buf); | |
65 | if (ret != 0) { | |
87dc6a9c | 66 | errno = -ret; |
4c462e79 | 67 | PERROR("Getting sub-buffer snapshot."); |
3bd1e081 MD |
68 | } |
69 | ||
70 | return ret; | |
71 | } | |
72 | ||
73 | /* | |
74 | * Get the produced position | |
75 | * | |
76 | * Returns 0 on success, < 0 on error | |
77 | */ | |
78 | int lttng_ustconsumer_get_produced_snapshot( | |
79 | struct lttng_consumer_local_data *ctx, | |
80 | struct lttng_consumer_stream *stream, | |
81 | unsigned long *pos) | |
82 | { | |
83 | int ret; | |
84 | ||
85 | ret = ustctl_snapshot_get_produced(stream->chan->handle, | |
86 | stream->buf, pos); | |
87 | if (ret != 0) { | |
87dc6a9c | 88 | errno = -ret; |
4c462e79 | 89 | PERROR("kernctl_snapshot_get_produced"); |
3bd1e081 MD |
90 | } |
91 | ||
92 | return ret; | |
93 | } | |
94 | ||
4cbc1a04 DG |
95 | /* |
96 | * Receive command from session daemon and process it. | |
97 | * | |
98 | * Return 1 on success else a negative value or 0. | |
99 | */ | |
3bd1e081 MD |
100 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
101 | int sock, struct pollfd *consumer_sockpoll) | |
102 | { | |
103 | ssize_t ret; | |
104 | struct lttcomm_consumer_msg msg; | |
105 | ||
106 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); | |
107 | if (ret != sizeof(msg)) { | |
173af62f DG |
108 | DBG("Consumer received unexpected message size %zd (expects %zu)", |
109 | ret, sizeof(msg)); | |
f73fabfd | 110 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
3bd1e081 MD |
111 | return ret; |
112 | } | |
113 | if (msg.cmd_type == LTTNG_CONSUMER_STOP) { | |
114 | return -ENOENT; | |
115 | } | |
116 | ||
3f8e211f | 117 | /* relayd needs RCU read-side lock */ |
b0b335c8 MD |
118 | rcu_read_lock(); |
119 | ||
3bd1e081 | 120 | switch (msg.cmd_type) { |
00e2e675 DG |
121 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
122 | { | |
7735ef9e DG |
123 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
124 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
125 | &msg.u.relayd_sock.sock); | |
00e2e675 DG |
126 | goto end_nosignal; |
127 | } | |
3bd1e081 MD |
128 | case LTTNG_CONSUMER_ADD_CHANNEL: |
129 | { | |
130 | struct lttng_consumer_channel *new_channel; | |
131 | int fds[1]; | |
132 | size_t nb_fd = 1; | |
133 | ||
173af62f DG |
134 | DBG("UST Consumer adding channel"); |
135 | ||
3bd1e081 MD |
136 | /* block */ |
137 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
3f8e211f | 138 | rcu_read_unlock(); |
3bd1e081 MD |
139 | return -EINTR; |
140 | } | |
141 | ret = lttcomm_recv_fds_unix_sock(sock, fds, nb_fd); | |
142 | if (ret != sizeof(fds)) { | |
f73fabfd | 143 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
3f8e211f | 144 | rcu_read_unlock(); |
3bd1e081 MD |
145 | return ret; |
146 | } | |
147 | ||
148 | DBG("consumer_add_channel %d", msg.u.channel.channel_key); | |
149 | ||
150 | new_channel = consumer_allocate_channel(msg.u.channel.channel_key, | |
151 | fds[0], -1, | |
152 | msg.u.channel.mmap_len, | |
c30aaa51 MD |
153 | msg.u.channel.max_sb_size, |
154 | msg.u.channel.nb_init_streams); | |
3bd1e081 | 155 | if (new_channel == NULL) { |
f73fabfd | 156 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
3bd1e081 MD |
157 | goto end_nosignal; |
158 | } | |
159 | if (ctx->on_recv_channel != NULL) { | |
160 | ret = ctx->on_recv_channel(new_channel); | |
161 | if (ret == 0) { | |
162 | consumer_add_channel(new_channel); | |
163 | } else if (ret < 0) { | |
164 | goto end_nosignal; | |
165 | } | |
166 | } else { | |
167 | consumer_add_channel(new_channel); | |
168 | } | |
169 | goto end_nosignal; | |
170 | } | |
171 | case LTTNG_CONSUMER_ADD_STREAM: | |
172 | { | |
173 | struct lttng_consumer_stream *new_stream; | |
174 | int fds[2]; | |
175 | size_t nb_fd = 2; | |
00e2e675 | 176 | struct consumer_relayd_sock_pair *relayd = NULL; |
c80048c6 | 177 | int alloc_ret = 0; |
3bd1e081 | 178 | |
173af62f DG |
179 | DBG("UST Consumer adding stream"); |
180 | ||
3bd1e081 MD |
181 | /* block */ |
182 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { | |
3f8e211f | 183 | rcu_read_unlock(); |
3bd1e081 MD |
184 | return -EINTR; |
185 | } | |
186 | ret = lttcomm_recv_fds_unix_sock(sock, fds, nb_fd); | |
187 | if (ret != sizeof(fds)) { | |
f73fabfd | 188 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); |
3f8e211f | 189 | rcu_read_unlock(); |
3bd1e081 MD |
190 | return ret; |
191 | } | |
192 | ||
7a57cf92 DG |
193 | DBG("Consumer command ADD_STREAM chan %d stream %d", |
194 | msg.u.stream.channel_key, msg.u.stream.stream_key); | |
173af62f | 195 | |
d41f73b7 | 196 | assert(msg.u.stream.output == LTTNG_EVENT_MMAP); |
173af62f | 197 | new_stream = consumer_allocate_stream(msg.u.stream.channel_key, |
3bd1e081 MD |
198 | msg.u.stream.stream_key, |
199 | fds[0], fds[1], | |
200 | msg.u.stream.state, | |
201 | msg.u.stream.mmap_len, | |
202 | msg.u.stream.output, | |
6df2e2c9 MD |
203 | msg.u.stream.path_name, |
204 | msg.u.stream.uid, | |
00e2e675 DG |
205 | msg.u.stream.gid, |
206 | msg.u.stream.net_index, | |
c80048c6 MD |
207 | msg.u.stream.metadata_flag, |
208 | &alloc_ret); | |
3bd1e081 | 209 | if (new_stream == NULL) { |
c80048c6 MD |
210 | switch (alloc_ret) { |
211 | case -ENOMEM: | |
212 | case -EINVAL: | |
213 | default: | |
214 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
215 | break; | |
216 | case -ENOENT: | |
217 | /* | |
218 | * We could not find the channel. Can happen if cpu hotplug | |
219 | * happens while tearing down. | |
220 | */ | |
221 | DBG3("Could not find channel"); | |
222 | break; | |
223 | } | |
3f8e211f | 224 | goto end_nosignal; |
3bd1e081 | 225 | } |
00e2e675 DG |
226 | |
227 | /* The stream is not metadata. Get relayd reference if exists. */ | |
228 | relayd = consumer_find_relayd(msg.u.stream.net_index); | |
229 | if (relayd != NULL) { | |
230 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); | |
231 | /* Add stream on the relayd */ | |
232 | ret = relayd_add_stream(&relayd->control_sock, | |
233 | msg.u.stream.name, msg.u.stream.path_name, | |
234 | &new_stream->relayd_stream_id); | |
235 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); | |
236 | if (ret < 0) { | |
e316aad5 | 237 | consumer_del_stream(new_stream, NULL); |
3f8e211f | 238 | goto end_nosignal; |
00e2e675 DG |
239 | } |
240 | } else if (msg.u.stream.net_index != -1) { | |
241 | ERR("Network sequence index %d unknown. Not adding stream.", | |
242 | msg.u.stream.net_index); | |
e316aad5 | 243 | consumer_del_stream(new_stream, NULL); |
3f8e211f | 244 | goto end_nosignal; |
00e2e675 DG |
245 | } |
246 | ||
633d0084 DG |
247 | /* Do actions once stream has been received. */ |
248 | if (ctx->on_recv_stream) { | |
249 | ret = ctx->on_recv_stream(new_stream); | |
250 | if (ret < 0) { | |
e316aad5 | 251 | consumer_del_stream(new_stream, NULL); |
633d0084 | 252 | goto end_nosignal; |
fb3a43a9 | 253 | } |
633d0084 | 254 | } |
fb3a43a9 | 255 | |
633d0084 DG |
256 | /* Send stream to the metadata thread */ |
257 | if (new_stream->metadata_flag) { | |
fb3a43a9 | 258 | do { |
633d0084 DG |
259 | ret = write(ctx->consumer_metadata_pipe[1], &new_stream, |
260 | sizeof(new_stream)); | |
fb3a43a9 DG |
261 | } while (ret < 0 && errno == EINTR); |
262 | if (ret < 0) { | |
263 | PERROR("write metadata pipe"); | |
e316aad5 DG |
264 | consumer_del_metadata_stream(new_stream, NULL); |
265 | goto end_nosignal; | |
3bd1e081 MD |
266 | } |
267 | } else { | |
e316aad5 DG |
268 | ret = consumer_add_stream(new_stream); |
269 | if (ret) { | |
270 | ERR("Consumer add stream %d failed. Continuing", | |
271 | new_stream->key); | |
272 | /* | |
273 | * At this point, if the add_stream fails, it is not in the | |
274 | * hash table thus passing the NULL value here. | |
275 | */ | |
276 | consumer_del_stream(new_stream, NULL); | |
277 | goto end_nosignal; | |
278 | } | |
3bd1e081 | 279 | } |
00e2e675 | 280 | |
77c7c900 | 281 | DBG("UST consumer_add_stream %s (%d,%d) with relayd id %" PRIu64, |
00e2e675 DG |
282 | msg.u.stream.path_name, fds[0], fds[1], |
283 | new_stream->relayd_stream_id); | |
3bd1e081 MD |
284 | break; |
285 | } | |
173af62f DG |
286 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
287 | { | |
a6ba4fe1 | 288 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
173af62f DG |
289 | struct consumer_relayd_sock_pair *relayd; |
290 | ||
a6ba4fe1 | 291 | DBG("UST consumer destroying relayd %" PRIu64, index); |
173af62f DG |
292 | |
293 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 294 | relayd = consumer_find_relayd(index); |
173af62f | 295 | if (relayd == NULL) { |
a6ba4fe1 | 296 | ERR("Unable to find relayd %" PRIu64, index); |
3f8e211f | 297 | goto end_nosignal; |
173af62f DG |
298 | } |
299 | ||
a6ba4fe1 DG |
300 | /* |
301 | * Each relayd socket pair has a refcount of stream attached to it | |
302 | * which tells if the relayd is still active or not depending on the | |
303 | * refcount value. | |
304 | * | |
305 | * This will set the destroy flag of the relayd object and destroy it | |
306 | * if the refcount reaches zero when called. | |
307 | * | |
308 | * The destroy can happen either here or when a stream fd hangs up. | |
309 | */ | |
310 | consumer_flag_relayd_for_destroy(relayd); | |
173af62f | 311 | |
3f8e211f | 312 | goto end_nosignal; |
173af62f | 313 | } |
3bd1e081 MD |
314 | case LTTNG_CONSUMER_UPDATE_STREAM: |
315 | { | |
3f8e211f | 316 | rcu_read_unlock(); |
7ad0a0cb MD |
317 | return -ENOSYS; |
318 | #if 0 | |
3bd1e081 MD |
319 | if (ctx->on_update_stream != NULL) { |
320 | ret = ctx->on_update_stream(msg.u.stream.stream_key, msg.u.stream.state); | |
321 | if (ret == 0) { | |
322 | consumer_change_stream_state(msg.u.stream.stream_key, msg.u.stream.state); | |
323 | } else if (ret < 0) { | |
324 | goto end; | |
325 | } | |
326 | } else { | |
327 | consumer_change_stream_state(msg.u.stream.stream_key, | |
328 | msg.u.stream.state); | |
329 | } | |
330 | break; | |
3f8e211f | 331 | #endif |
3bd1e081 MD |
332 | } |
333 | default: | |
334 | break; | |
335 | } | |
3f8e211f | 336 | |
04fdd819 | 337 | /* |
3f8e211f DG |
338 | * Wake-up the other end by writing a null byte in the pipe (non-blocking). |
339 | * Important note: Because writing into the pipe is non-blocking (and | |
340 | * therefore we allow dropping wakeup data, as long as there is wakeup data | |
341 | * present in the pipe buffer to wake up the other end), the other end | |
342 | * should perform the following sequence for waiting: | |
343 | * | |
04fdd819 MD |
344 | * 1) empty the pipe (reads). |
345 | * 2) perform update operation. | |
346 | * 3) wait on the pipe (poll). | |
347 | */ | |
348 | do { | |
349 | ret = write(ctx->consumer_poll_pipe[1], "", 1); | |
6f94560a | 350 | } while (ret < 0 && errno == EINTR); |
3bd1e081 | 351 | end_nosignal: |
b0b335c8 | 352 | rcu_read_unlock(); |
4cbc1a04 DG |
353 | |
354 | /* | |
355 | * Return 1 to indicate success since the 0 value can be a socket | |
356 | * shutdown during the recv() or send() call. | |
357 | */ | |
358 | return 1; | |
3bd1e081 MD |
359 | } |
360 | ||
361 | int lttng_ustconsumer_allocate_channel(struct lttng_consumer_channel *chan) | |
362 | { | |
13161846 | 363 | struct lttng_ust_object_data obj; |
3bd1e081 MD |
364 | |
365 | obj.handle = -1; | |
366 | obj.shm_fd = chan->shm_fd; | |
367 | obj.wait_fd = chan->wait_fd; | |
368 | obj.memory_map_size = chan->mmap_len; | |
369 | chan->handle = ustctl_map_channel(&obj); | |
370 | if (!chan->handle) { | |
371 | return -ENOMEM; | |
372 | } | |
b5c5fc29 | 373 | chan->wait_fd_is_copy = 1; |
2c1dd183 | 374 | chan->shm_fd = -1; |
b5c5fc29 | 375 | |
3bd1e081 MD |
376 | return 0; |
377 | } | |
378 | ||
d056b477 MD |
379 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) |
380 | { | |
381 | ustctl_flush_buffer(stream->chan->handle, stream->buf, 0); | |
effcf122 | 382 | stream->hangup_flush_done = 1; |
d056b477 MD |
383 | } |
384 | ||
3bd1e081 MD |
385 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
386 | { | |
387 | ustctl_unmap_channel(chan->handle); | |
388 | } | |
389 | ||
e316aad5 | 390 | int lttng_ustconsumer_add_stream(struct lttng_consumer_stream *stream) |
3bd1e081 | 391 | { |
13161846 | 392 | struct lttng_ust_object_data obj; |
3bd1e081 MD |
393 | int ret; |
394 | ||
395 | obj.handle = -1; | |
396 | obj.shm_fd = stream->shm_fd; | |
397 | obj.wait_fd = stream->wait_fd; | |
398 | obj.memory_map_size = stream->mmap_len; | |
399 | ret = ustctl_add_stream(stream->chan->handle, &obj); | |
7a57cf92 DG |
400 | if (ret) { |
401 | ERR("UST ctl add_stream failed with ret %d", ret); | |
e316aad5 | 402 | goto error; |
7a57cf92 DG |
403 | } |
404 | ||
3bd1e081 | 405 | stream->buf = ustctl_open_stream_read(stream->chan->handle, stream->cpu); |
7a57cf92 DG |
406 | if (!stream->buf) { |
407 | ERR("UST ctl open_stream_read failed"); | |
e316aad5 DG |
408 | ret = -EBUSY; |
409 | goto error; | |
7a57cf92 DG |
410 | } |
411 | ||
2c1dd183 MD |
412 | /* ustctl_open_stream_read has closed the shm fd. */ |
413 | stream->wait_fd_is_copy = 1; | |
414 | stream->shm_fd = -1; | |
415 | ||
3bd1e081 MD |
416 | stream->mmap_base = ustctl_get_mmap_base(stream->chan->handle, stream->buf); |
417 | if (!stream->mmap_base) { | |
7a57cf92 | 418 | ERR("UST ctl get_mmap_base failed"); |
e316aad5 DG |
419 | ret = -EINVAL; |
420 | goto mmap_error; | |
3bd1e081 | 421 | } |
ee77a7b0 | 422 | |
3bd1e081 | 423 | return 0; |
e316aad5 DG |
424 | |
425 | mmap_error: | |
426 | ustctl_close_stream_read(stream->chan->handle, stream->buf); | |
427 | error: | |
428 | return ret; | |
3bd1e081 MD |
429 | } |
430 | ||
431 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) | |
432 | { | |
433 | ustctl_close_stream_read(stream->chan->handle, stream->buf); | |
434 | } | |
d41f73b7 MD |
435 | |
436 | ||
437 | int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream, | |
438 | struct lttng_consumer_local_data *ctx) | |
439 | { | |
1d4dfdef | 440 | unsigned long len, subbuf_size, padding; |
d41f73b7 MD |
441 | int err; |
442 | long ret = 0; | |
443 | struct lttng_ust_shm_handle *handle; | |
444 | struct lttng_ust_lib_ring_buffer *buf; | |
445 | char dummy; | |
446 | ssize_t readlen; | |
447 | ||
448 | DBG("In read_subbuffer (wait_fd: %d, stream key: %d)", | |
449 | stream->wait_fd, stream->key); | |
450 | ||
451 | /* We can consume the 1 byte written into the wait_fd by UST */ | |
effcf122 MD |
452 | if (!stream->hangup_flush_done) { |
453 | do { | |
454 | readlen = read(stream->wait_fd, &dummy, 1); | |
87dc6a9c | 455 | } while (readlen == -1 && errno == EINTR); |
effcf122 MD |
456 | if (readlen == -1) { |
457 | ret = readlen; | |
458 | goto end; | |
459 | } | |
d41f73b7 MD |
460 | } |
461 | ||
462 | buf = stream->buf; | |
463 | handle = stream->chan->handle; | |
464 | /* Get the next subbuffer */ | |
465 | err = ustctl_get_next_subbuf(handle, buf); | |
466 | if (err != 0) { | |
1d4dfdef | 467 | ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */ |
d41f73b7 MD |
468 | /* |
469 | * This is a debug message even for single-threaded consumer, | |
470 | * because poll() have more relaxed criterions than get subbuf, | |
471 | * so get_subbuf may fail for short race windows where poll() | |
472 | * would issue wakeups. | |
473 | */ | |
474 | DBG("Reserving sub buffer failed (everything is normal, " | |
475 | "it is due to concurrency)"); | |
476 | goto end; | |
477 | } | |
478 | assert(stream->output == LTTNG_EVENT_MMAP); | |
1d4dfdef | 479 | /* Get the full padded subbuffer size */ |
d41f73b7 | 480 | err = ustctl_get_padded_subbuf_size(handle, buf, &len); |
effcf122 | 481 | assert(err == 0); |
1d4dfdef DG |
482 | |
483 | /* Get subbuffer data size (without padding) */ | |
484 | err = ustctl_get_subbuf_size(handle, buf, &subbuf_size); | |
485 | assert(err == 0); | |
486 | ||
487 | /* Make sure we don't get a subbuffer size bigger than the padded */ | |
488 | assert(len >= subbuf_size); | |
489 | ||
490 | padding = len - subbuf_size; | |
d41f73b7 | 491 | /* write the subbuffer to the tracefile */ |
1d4dfdef | 492 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, padding); |
91dfef6e DG |
493 | /* |
494 | * The mmap operation should write subbuf_size amount of data when network | |
495 | * streaming or the full padding (len) size when we are _not_ streaming. | |
496 | */ | |
497 | if ((ret != subbuf_size && stream->net_seq_idx != -1) || | |
498 | (ret != len && stream->net_seq_idx == -1)) { | |
d41f73b7 | 499 | /* |
91dfef6e DG |
500 | * Display the error but continue processing to try to release the |
501 | * subbuffer | |
d41f73b7 | 502 | */ |
91dfef6e DG |
503 | ERR("Error writing to tracefile " |
504 | "(ret: %zd != len: %lu != subbuf_size: %lu)", | |
505 | ret, len, subbuf_size); | |
d41f73b7 MD |
506 | } |
507 | err = ustctl_put_next_subbuf(handle, buf); | |
effcf122 | 508 | assert(err == 0); |
d41f73b7 MD |
509 | end: |
510 | return ret; | |
511 | } | |
512 | ||
513 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) | |
514 | { | |
515 | int ret; | |
516 | ||
517 | /* Opening the tracefile in write mode */ | |
00e2e675 | 518 | if (stream->path_name != NULL && stream->net_seq_idx == -1) { |
e11d277b | 519 | ret = run_as_open(stream->path_name, |
60b6c79c MD |
520 | O_WRONLY|O_CREAT|O_TRUNC, |
521 | S_IRWXU|S_IRWXG|S_IRWXO, | |
522 | stream->uid, stream->gid); | |
d41f73b7 MD |
523 | if (ret < 0) { |
524 | ERR("Opening %s", stream->path_name); | |
4c462e79 | 525 | PERROR("open"); |
d41f73b7 MD |
526 | goto error; |
527 | } | |
528 | stream->out_fd = ret; | |
529 | } | |
530 | ||
531 | /* we return 0 to let the library handle the FD internally */ | |
532 | return 0; | |
533 | ||
534 | error: | |
535 | return ret; | |
536 | } |