Commit | Line | Data |
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1ce86c9a JD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
82a3637f DG |
7 | * as published by the Free Software Foundation; only version 2 |
8 | * of the License. | |
1ce86c9a JD |
9 | * |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
18 | */ | |
19 | ||
20 | #define _GNU_SOURCE | |
21 | #include <fcntl.h> | |
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> | |
28 | #include <sys/types.h> | |
29 | #include <unistd.h> | |
30 | #include <urcu/list.h> | |
159c7ff4 | 31 | #include <assert.h> |
1ce86c9a | 32 | |
50ecdf72 MD |
33 | #include "kernelctl.h" |
34 | #include "lttkconsumerd.h" | |
1ce86c9a JD |
35 | #include "lttngerr.h" |
36 | ||
242cd187 MD |
37 | static |
38 | struct kconsumerd_global_data { | |
39 | /* | |
40 | * kconsumerd_data.lock protects kconsumerd_data.fd_list, | |
41 | * kconsumerd_data.fds_count, and kconsumerd_data.need_update. It | |
42 | * ensures the count matches the number of items in the fd_list. | |
43 | * It ensures the list updates *always* trigger an fd_array | |
44 | * update (therefore need to make list update vs | |
45 | * kconsumerd_data.need_update flag update atomic, and also flag | |
46 | * read, fd array and flag clear atomic). | |
47 | */ | |
48 | pthread_mutex_t lock; | |
49 | /* | |
50 | * Number of element for the list below. Protected by | |
51 | * kconsumerd_data.lock. | |
52 | */ | |
53 | unsigned int fds_count; | |
54 | /* | |
55 | * List of FDs. Protected by kconsumerd_data.lock. | |
56 | */ | |
57 | struct kconsumerd_fd_list fd_list; | |
58 | /* | |
59 | * Flag specifying if the local array of FDs needs update in the | |
60 | * poll function. Protected by kconsumerd_data.lock. | |
61 | */ | |
62 | unsigned int need_update; | |
63 | } kconsumerd_data = { | |
64 | .fd_list.head = CDS_LIST_HEAD_INIT(kconsumerd_data.fd_list.head), | |
cb040cc1 JD |
65 | .fds_count = 0, |
66 | .need_update = 1, | |
1ce86c9a JD |
67 | }; |
68 | ||
1ce86c9a JD |
69 | /* timeout parameter, to control the polling thread grace period */ |
70 | static int kconsumerd_poll_timeout = -1; | |
71 | ||
3dcd2721 MD |
72 | /* |
73 | * flag to inform the polling thread to quit when all fd hung up. | |
74 | * Updated by the kconsumerd_thread_receive_fds when it notices that all | |
75 | * fds has hung up. Also updated by the signal handler | |
76 | * (kconsumerd_should_exit()). Read by the polling threads. | |
77 | */ | |
78 | static volatile int kconsumerd_quit = 0; | |
1ce86c9a JD |
79 | |
80 | /* | |
81 | * kconsumerd_set_error_socket | |
82 | * | |
83 | * Set the error socket | |
84 | */ | |
cb040cc1 | 85 | void kconsumerd_set_error_socket(struct kconsumerd_local_data *ctx, int sock) |
1ce86c9a | 86 | { |
cb040cc1 | 87 | ctx->kconsumerd_error_socket = sock; |
1ce86c9a JD |
88 | } |
89 | ||
90 | /* | |
91 | * kconsumerd_set_command_socket_path | |
92 | * | |
93 | * Set the command socket path | |
94 | */ | |
cb040cc1 JD |
95 | void kconsumerd_set_command_socket_path(struct kconsumerd_local_data *ctx, |
96 | char *sock) | |
1ce86c9a | 97 | { |
cb040cc1 | 98 | ctx->kconsumerd_command_sock_path = sock; |
1ce86c9a JD |
99 | } |
100 | ||
38079a1b DG |
101 | /* |
102 | * kconsumerd_find_session_fd | |
103 | * | |
104 | * Find a session fd in the global list. | |
fec07047 | 105 | * The kconsumerd_data.lock must be locked during this call |
38079a1b DG |
106 | * |
107 | * Return 1 if found else 0 | |
108 | */ | |
109 | static int kconsumerd_find_session_fd(int fd) | |
110 | { | |
111 | struct kconsumerd_fd *iter; | |
112 | ||
242cd187 | 113 | cds_list_for_each_entry(iter, &kconsumerd_data.fd_list.head, list) { |
38079a1b DG |
114 | if (iter->sessiond_fd == fd) { |
115 | DBG("Duplicate session fd %d", fd); | |
38079a1b DG |
116 | return 1; |
117 | } | |
118 | } | |
38079a1b DG |
119 | |
120 | return 0; | |
121 | } | |
122 | ||
1ce86c9a JD |
123 | /* |
124 | * kconsumerd_del_fd | |
125 | * | |
126 | * Remove a fd from the global list protected by a mutex | |
127 | */ | |
128 | static void kconsumerd_del_fd(struct kconsumerd_fd *lcf) | |
129 | { | |
8b270bdb | 130 | int ret; |
242cd187 | 131 | pthread_mutex_lock(&kconsumerd_data.lock); |
1ce86c9a | 132 | cds_list_del(&lcf->list); |
242cd187 MD |
133 | if (kconsumerd_data.fds_count > 0) { |
134 | kconsumerd_data.fds_count--; | |
1ce86c9a | 135 | if (lcf != NULL) { |
8b270bdb JD |
136 | if (lcf->mmap_base != NULL) { |
137 | ret = munmap(lcf->mmap_base, lcf->mmap_len); | |
138 | if (ret != 0) { | |
139 | perror("munmap"); | |
140 | } | |
141 | } | |
cb040cc1 JD |
142 | if (lcf->out_fd != 0) { |
143 | close(lcf->out_fd); | |
144 | } | |
1ce86c9a JD |
145 | close(lcf->consumerd_fd); |
146 | free(lcf); | |
147 | lcf = NULL; | |
148 | } | |
149 | } | |
242cd187 MD |
150 | kconsumerd_data.need_update = 1; |
151 | pthread_mutex_unlock(&kconsumerd_data.lock); | |
1ce86c9a JD |
152 | } |
153 | ||
154 | /* | |
155 | * kconsumerd_add_fd | |
156 | * | |
157 | * Add a fd to the global list protected by a mutex | |
158 | */ | |
159 | static int kconsumerd_add_fd(struct lttcomm_kconsumerd_msg *buf, int consumerd_fd) | |
160 | { | |
38079a1b | 161 | struct kconsumerd_fd *tmp_fd; |
cb040cc1 | 162 | int ret = 0; |
38079a1b | 163 | |
242cd187 | 164 | pthread_mutex_lock(&kconsumerd_data.lock); |
38079a1b DG |
165 | /* Check if already exist */ |
166 | ret = kconsumerd_find_session_fd(buf->fd); | |
167 | if (ret == 1) { | |
168 | goto end; | |
169 | } | |
1ce86c9a JD |
170 | |
171 | tmp_fd = malloc(sizeof(struct kconsumerd_fd)); | |
172 | tmp_fd->sessiond_fd = buf->fd; | |
173 | tmp_fd->consumerd_fd = consumerd_fd; | |
174 | tmp_fd->state = buf->state; | |
175 | tmp_fd->max_sb_size = buf->max_sb_size; | |
cb040cc1 JD |
176 | tmp_fd->out_fd = 0; |
177 | tmp_fd->out_fd_offset = 0; | |
8b270bdb JD |
178 | tmp_fd->mmap_len = 0; |
179 | tmp_fd->mmap_base = NULL; | |
180 | tmp_fd->output = buf->output; | |
1ce86c9a | 181 | strncpy(tmp_fd->path_name, buf->path_name, PATH_MAX); |
99497cd0 | 182 | tmp_fd->path_name[PATH_MAX - 1] = '\0'; |
1ce86c9a JD |
183 | |
184 | /* Opening the tracefile in write mode */ | |
cb040cc1 JD |
185 | if (tmp_fd->path_name != NULL) { |
186 | ret = open(tmp_fd->path_name, | |
187 | O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG|S_IRWXO); | |
188 | if (ret < 0) { | |
189 | ERR("Opening %s", tmp_fd->path_name); | |
190 | perror("open"); | |
191 | goto end; | |
192 | } | |
193 | tmp_fd->out_fd = ret; | |
194 | DBG("Adding %s (%d, %d, %d)", tmp_fd->path_name, | |
195 | tmp_fd->sessiond_fd, tmp_fd->consumerd_fd, tmp_fd->out_fd); | |
1ce86c9a | 196 | } |
1ce86c9a | 197 | |
8b270bdb JD |
198 | if (tmp_fd->output == LTTNG_EVENT_MMAP) { |
199 | /* get the len of the mmap region */ | |
200 | ret = kernctl_get_mmap_len(tmp_fd->consumerd_fd, &tmp_fd->mmap_len); | |
201 | if (ret != 0) { | |
202 | ret = errno; | |
203 | perror("kernctl_get_mmap_len"); | |
204 | goto end; | |
205 | } | |
206 | ||
207 | tmp_fd->mmap_base = mmap(NULL, tmp_fd->mmap_len, | |
208 | PROT_READ, MAP_PRIVATE, tmp_fd->consumerd_fd, 0); | |
209 | if (tmp_fd->mmap_base == MAP_FAILED) { | |
210 | perror("Error mmaping"); | |
211 | ret = -1; | |
212 | goto end; | |
213 | } | |
214 | } | |
215 | ||
242cd187 MD |
216 | cds_list_add(&tmp_fd->list, &kconsumerd_data.fd_list.head); |
217 | kconsumerd_data.fds_count++; | |
218 | kconsumerd_data.need_update = 1; | |
1ce86c9a | 219 | end: |
242cd187 | 220 | pthread_mutex_unlock(&kconsumerd_data.lock); |
1ce86c9a JD |
221 | return ret; |
222 | } | |
223 | ||
224 | /* | |
225 | * kconsumerd_change_fd_state | |
226 | * | |
227 | * Update a fd according to what we just received | |
228 | */ | |
229 | static void kconsumerd_change_fd_state(int sessiond_fd, | |
230 | enum kconsumerd_fd_state state) | |
231 | { | |
232 | struct kconsumerd_fd *iter; | |
0237248c | 233 | |
242cd187 MD |
234 | pthread_mutex_lock(&kconsumerd_data.lock); |
235 | cds_list_for_each_entry(iter, &kconsumerd_data.fd_list.head, list) { | |
1ce86c9a JD |
236 | if (iter->sessiond_fd == sessiond_fd) { |
237 | iter->state = state; | |
238 | break; | |
239 | } | |
240 | } | |
242cd187 MD |
241 | kconsumerd_data.need_update = 1; |
242 | pthread_mutex_unlock(&kconsumerd_data.lock); | |
1ce86c9a JD |
243 | } |
244 | ||
245 | /* | |
246 | * kconsumerd_update_poll_array | |
247 | * | |
248 | * Allocate the pollfd structure and the local view of the out fds | |
249 | * to avoid doing a lookup in the linked list and concurrency issues | |
250 | * when writing is needed. | |
251 | * Returns the number of fds in the structures | |
242cd187 | 252 | * Called with kconsumerd_data.lock held. |
1ce86c9a | 253 | */ |
cb040cc1 JD |
254 | static int kconsumerd_update_poll_array(struct kconsumerd_local_data *ctx, |
255 | struct pollfd **pollfd, struct kconsumerd_fd **local_kconsumerd_fd) | |
1ce86c9a JD |
256 | { |
257 | struct kconsumerd_fd *iter; | |
258 | int i = 0; | |
259 | ||
260 | DBG("Updating poll fd array"); | |
242cd187 | 261 | cds_list_for_each_entry(iter, &kconsumerd_data.fd_list.head, list) { |
1ce86c9a JD |
262 | if (iter->state == ACTIVE_FD) { |
263 | DBG("Active FD %d", iter->consumerd_fd); | |
264 | (*pollfd)[i].fd = iter->consumerd_fd; | |
265 | (*pollfd)[i].events = POLLIN | POLLPRI; | |
266 | local_kconsumerd_fd[i] = iter; | |
267 | i++; | |
268 | } | |
269 | } | |
270 | ||
271 | /* | |
272 | * insert the kconsumerd_poll_pipe at the end of the array and don't | |
273 | * increment i so nb_fd is the number of real FD | |
274 | */ | |
cb040cc1 | 275 | (*pollfd)[i].fd = ctx->kconsumerd_poll_pipe[0]; |
1ce86c9a | 276 | (*pollfd)[i].events = POLLIN; |
1ce86c9a JD |
277 | return i; |
278 | } | |
279 | ||
280 | ||
281 | /* | |
282 | * kconsumerd_on_read_subbuffer_mmap | |
283 | * | |
284 | * mmap the ring buffer, read it and write the data to the tracefile. | |
285 | * Returns the number of bytes written | |
286 | */ | |
cb040cc1 | 287 | int kconsumerd_on_read_subbuffer_mmap(struct kconsumerd_local_data *ctx, |
1ce86c9a JD |
288 | struct kconsumerd_fd *kconsumerd_fd, unsigned long len) |
289 | { | |
8b270bdb | 290 | unsigned long mmap_offset; |
1ce86c9a JD |
291 | char *padding = NULL; |
292 | long ret = 0; | |
293 | off_t orig_offset = kconsumerd_fd->out_fd_offset; | |
294 | int fd = kconsumerd_fd->consumerd_fd; | |
295 | int outfd = kconsumerd_fd->out_fd; | |
296 | ||
1ce86c9a JD |
297 | /* get the offset inside the fd to mmap */ |
298 | ret = kernctl_get_mmap_read_offset(fd, &mmap_offset); | |
299 | if (ret != 0) { | |
300 | ret = errno; | |
301 | perror("kernctl_get_mmap_read_offset"); | |
302 | goto end; | |
303 | } | |
304 | ||
1ce86c9a | 305 | while (len > 0) { |
8b270bdb | 306 | ret = write(outfd, kconsumerd_fd->mmap_base + mmap_offset, len); |
1ce86c9a JD |
307 | if (ret >= len) { |
308 | len = 0; | |
309 | } else if (ret < 0) { | |
310 | ret = errno; | |
311 | perror("Error in file write"); | |
312 | goto end; | |
313 | } | |
314 | /* This won't block, but will start writeout asynchronously */ | |
315 | sync_file_range(outfd, kconsumerd_fd->out_fd_offset, ret, | |
316 | SYNC_FILE_RANGE_WRITE); | |
317 | kconsumerd_fd->out_fd_offset += ret; | |
318 | } | |
319 | ||
1ce86c9a JD |
320 | /* |
321 | * This does a blocking write-and-wait on any page that belongs to the | |
322 | * subbuffer prior to the one we just wrote. | |
323 | * Don't care about error values, as these are just hints and ways to | |
324 | * limit the amount of page cache used. | |
325 | */ | |
326 | if (orig_offset >= kconsumerd_fd->max_sb_size) { | |
327 | sync_file_range(outfd, orig_offset - kconsumerd_fd->max_sb_size, | |
328 | kconsumerd_fd->max_sb_size, | |
329 | SYNC_FILE_RANGE_WAIT_BEFORE | |
330 | | SYNC_FILE_RANGE_WRITE | |
331 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
332 | ||
333 | /* | |
334 | * Give hints to the kernel about how we access the file: | |
335 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
336 | * we write it. | |
337 | * | |
338 | * We need to call fadvise again after the file grows because the | |
339 | * kernel does not seem to apply fadvise to non-existing parts of the | |
340 | * file. | |
341 | * | |
342 | * Call fadvise _after_ having waited for the page writeback to | |
343 | * complete because the dirty page writeback semantic is not well | |
344 | * defined. So it can be expected to lead to lower throughput in | |
345 | * streaming. | |
346 | */ | |
347 | posix_fadvise(outfd, orig_offset - kconsumerd_fd->max_sb_size, | |
348 | kconsumerd_fd->max_sb_size, POSIX_FADV_DONTNEED); | |
349 | } | |
350 | goto end; | |
351 | ||
352 | end: | |
353 | if (padding != NULL) { | |
354 | free(padding); | |
355 | } | |
356 | return ret; | |
357 | } | |
358 | ||
359 | /* | |
360 | * kconsumerd_on_read_subbuffer | |
361 | * | |
362 | * Splice the data from the ring buffer to the tracefile. | |
363 | * Returns the number of bytes spliced | |
364 | */ | |
cb040cc1 | 365 | int kconsumerd_on_read_subbuffer_splice(struct kconsumerd_local_data *ctx, |
1ce86c9a JD |
366 | struct kconsumerd_fd *kconsumerd_fd, unsigned long len) |
367 | { | |
368 | long ret = 0; | |
369 | loff_t offset = 0; | |
370 | off_t orig_offset = kconsumerd_fd->out_fd_offset; | |
371 | int fd = kconsumerd_fd->consumerd_fd; | |
372 | int outfd = kconsumerd_fd->out_fd; | |
373 | ||
374 | while (len > 0) { | |
375 | DBG("splice chan to pipe offset %lu (fd : %d)", | |
376 | (unsigned long)offset, fd); | |
cb040cc1 | 377 | ret = splice(fd, &offset, ctx->kconsumerd_thread_pipe[1], NULL, len, |
1ce86c9a JD |
378 | SPLICE_F_MOVE | SPLICE_F_MORE); |
379 | DBG("splice chan to pipe ret %ld", ret); | |
380 | if (ret < 0) { | |
381 | ret = errno; | |
382 | perror("Error in relay splice"); | |
383 | goto splice_error; | |
384 | } | |
385 | ||
cb040cc1 | 386 | ret = splice(ctx->kconsumerd_thread_pipe[0], NULL, outfd, NULL, ret, |
1ce86c9a JD |
387 | SPLICE_F_MOVE | SPLICE_F_MORE); |
388 | DBG("splice pipe to file %ld", ret); | |
389 | if (ret < 0) { | |
390 | ret = errno; | |
391 | perror("Error in file splice"); | |
392 | goto splice_error; | |
393 | } | |
394 | if (ret >= len) { | |
395 | len = 0; | |
396 | } | |
397 | /* This won't block, but will start writeout asynchronously */ | |
398 | sync_file_range(outfd, kconsumerd_fd->out_fd_offset, ret, | |
399 | SYNC_FILE_RANGE_WRITE); | |
400 | kconsumerd_fd->out_fd_offset += ret; | |
401 | } | |
402 | ||
403 | /* | |
404 | * This does a blocking write-and-wait on any page that belongs to the | |
405 | * subbuffer prior to the one we just wrote. | |
406 | * Don't care about error values, as these are just hints and ways to | |
407 | * limit the amount of page cache used. | |
408 | */ | |
409 | if (orig_offset >= kconsumerd_fd->max_sb_size) { | |
410 | sync_file_range(outfd, orig_offset - kconsumerd_fd->max_sb_size, | |
411 | kconsumerd_fd->max_sb_size, | |
412 | SYNC_FILE_RANGE_WAIT_BEFORE | |
413 | | SYNC_FILE_RANGE_WRITE | |
414 | | SYNC_FILE_RANGE_WAIT_AFTER); | |
415 | /* | |
416 | * Give hints to the kernel about how we access the file: | |
417 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after | |
418 | * we write it. | |
419 | * | |
420 | * We need to call fadvise again after the file grows because the | |
421 | * kernel does not seem to apply fadvise to non-existing parts of the | |
422 | * file. | |
423 | * | |
424 | * Call fadvise _after_ having waited for the page writeback to | |
425 | * complete because the dirty page writeback semantic is not well | |
426 | * defined. So it can be expected to lead to lower throughput in | |
427 | * streaming. | |
428 | */ | |
429 | posix_fadvise(outfd, orig_offset - kconsumerd_fd->max_sb_size, | |
430 | kconsumerd_fd->max_sb_size, POSIX_FADV_DONTNEED); | |
431 | } | |
432 | goto end; | |
433 | ||
434 | splice_error: | |
435 | /* send the appropriate error description to sessiond */ | |
436 | switch(ret) { | |
437 | case EBADF: | |
cb040cc1 | 438 | kconsumerd_send_error(ctx, KCONSUMERD_SPLICE_EBADF); |
1ce86c9a JD |
439 | break; |
440 | case EINVAL: | |
cb040cc1 | 441 | kconsumerd_send_error(ctx, KCONSUMERD_SPLICE_EINVAL); |
1ce86c9a JD |
442 | break; |
443 | case ENOMEM: | |
cb040cc1 | 444 | kconsumerd_send_error(ctx, KCONSUMERD_SPLICE_ENOMEM); |
1ce86c9a JD |
445 | break; |
446 | case ESPIPE: | |
cb040cc1 | 447 | kconsumerd_send_error(ctx, KCONSUMERD_SPLICE_ESPIPE); |
1ce86c9a | 448 | break; |
1ce86c9a JD |
449 | } |
450 | ||
451 | end: | |
452 | return ret; | |
453 | } | |
454 | ||
4de84ad9 JD |
455 | /* |
456 | * kconsumerd_poll_socket | |
457 | * | |
458 | * Poll on the should_quit pipe and the command socket | |
459 | * return -1 on error and should exit, 0 if data is | |
460 | * available on the command socket | |
461 | */ | |
462 | int kconsumerd_poll_socket(struct pollfd *kconsumerd_sockpoll) | |
463 | { | |
464 | int num_rdy; | |
465 | ||
466 | num_rdy = poll(kconsumerd_sockpoll, 2, -1); | |
467 | if (num_rdy == -1) { | |
468 | perror("Poll error"); | |
469 | goto exit; | |
470 | } | |
471 | if (kconsumerd_sockpoll[0].revents == POLLIN) { | |
472 | DBG("kconsumerd_should_quit wake up"); | |
473 | goto exit; | |
474 | } | |
475 | return 0; | |
476 | ||
477 | exit: | |
478 | return -1; | |
479 | } | |
480 | ||
1ce86c9a JD |
481 | /* |
482 | * kconsumerd_consumerd_recv_fd | |
483 | * | |
484 | * Receives an array of file descriptors and the associated | |
485 | * structures describing each fd (path name). | |
486 | * Returns the size of received data | |
487 | */ | |
cb040cc1 JD |
488 | static int kconsumerd_consumerd_recv_fd(struct kconsumerd_local_data *ctx, |
489 | int sfd, struct pollfd *kconsumerd_sockpoll, int size, | |
1ce86c9a JD |
490 | enum kconsumerd_command cmd_type) |
491 | { | |
1ce86c9a JD |
492 | struct iovec iov[1]; |
493 | int ret = 0, i, tmp2; | |
494 | struct cmsghdr *cmsg; | |
495 | int nb_fd; | |
496 | char recv_fd[CMSG_SPACE(sizeof(int))]; | |
497 | struct lttcomm_kconsumerd_msg lkm; | |
498 | ||
499 | /* the number of fds we are about to receive */ | |
500 | nb_fd = size / sizeof(struct lttcomm_kconsumerd_msg); | |
501 | ||
159c7ff4 | 502 | /* |
8b97b5dd | 503 | * nb_fd is the number of fds we receive. One fd per recvmsg. |
159c7ff4 | 504 | */ |
1ce86c9a | 505 | for (i = 0; i < nb_fd; i++) { |
159c7ff4 | 506 | struct msghdr msg = { 0 }; |
1ce86c9a JD |
507 | |
508 | /* Prepare to receive the structures */ | |
509 | iov[0].iov_base = &lkm; | |
510 | iov[0].iov_len = sizeof(lkm); | |
511 | msg.msg_iov = iov; | |
512 | msg.msg_iovlen = 1; | |
513 | ||
514 | msg.msg_control = recv_fd; | |
515 | msg.msg_controllen = sizeof(recv_fd); | |
516 | ||
517 | DBG("Waiting to receive fd"); | |
4de84ad9 JD |
518 | if (kconsumerd_poll_socket(kconsumerd_sockpoll) < 0) { |
519 | goto end; | |
520 | } | |
521 | ||
1ce86c9a JD |
522 | if ((ret = recvmsg(sfd, &msg, 0)) < 0) { |
523 | perror("recvmsg"); | |
524 | continue; | |
525 | } | |
526 | ||
527 | if (ret != (size / nb_fd)) { | |
528 | ERR("Received only %d, expected %d", ret, size); | |
cb040cc1 | 529 | kconsumerd_send_error(ctx, KCONSUMERD_ERROR_RECV_FD); |
1ce86c9a JD |
530 | goto end; |
531 | } | |
532 | ||
533 | cmsg = CMSG_FIRSTHDR(&msg); | |
534 | if (!cmsg) { | |
535 | ERR("Invalid control message header"); | |
536 | ret = -1; | |
cb040cc1 | 537 | kconsumerd_send_error(ctx, KCONSUMERD_ERROR_RECV_FD); |
1ce86c9a JD |
538 | goto end; |
539 | } | |
159c7ff4 | 540 | |
1ce86c9a JD |
541 | /* if we received fds */ |
542 | if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) { | |
543 | switch (cmd_type) { | |
544 | case ADD_STREAM: | |
159c7ff4 MD |
545 | DBG("kconsumerd_add_fd %s (%d)", lkm.path_name, ((int *) CMSG_DATA(cmsg))[0]); |
546 | ret = kconsumerd_add_fd(&lkm, ((int *) CMSG_DATA(cmsg))[0]); | |
1ce86c9a | 547 | if (ret < 0) { |
cb040cc1 | 548 | kconsumerd_send_error(ctx, KCONSUMERD_OUTFD_ERROR); |
1ce86c9a JD |
549 | goto end; |
550 | } | |
551 | break; | |
552 | case UPDATE_STREAM: | |
553 | kconsumerd_change_fd_state(lkm.fd, lkm.state); | |
554 | break; | |
555 | default: | |
556 | break; | |
557 | } | |
1ce86c9a | 558 | /* signal the poll thread */ |
cb040cc1 | 559 | tmp2 = write(ctx->kconsumerd_poll_pipe[1], "4", 1); |
f40799e8 DG |
560 | if (tmp2 < 0) { |
561 | perror("write kconsumerd poll"); | |
562 | } | |
1ce86c9a JD |
563 | } else { |
564 | ERR("Didn't received any fd"); | |
cb040cc1 | 565 | kconsumerd_send_error(ctx, KCONSUMERD_ERROR_RECV_FD); |
1ce86c9a JD |
566 | ret = -1; |
567 | goto end; | |
568 | } | |
569 | } | |
570 | ||
571 | end: | |
1ce86c9a JD |
572 | return ret; |
573 | } | |
574 | ||
575 | /* | |
576 | * kconsumerd_thread_poll_fds | |
577 | * | |
578 | * This thread polls the fds in the ltt_fd_list to consume the data | |
579 | * and write it to tracefile if necessary. | |
580 | */ | |
581 | void *kconsumerd_thread_poll_fds(void *data) | |
582 | { | |
583 | int num_rdy, num_hup, high_prio, ret, i; | |
584 | struct pollfd *pollfd = NULL; | |
585 | /* local view of the fds */ | |
586 | struct kconsumerd_fd **local_kconsumerd_fd = NULL; | |
242cd187 | 587 | /* local view of kconsumerd_data.fds_count */ |
1ce86c9a JD |
588 | int nb_fd = 0; |
589 | char tmp; | |
590 | int tmp2; | |
cb040cc1 | 591 | struct kconsumerd_local_data *ctx = data; |
1ce86c9a | 592 | |
1ce86c9a JD |
593 | |
594 | local_kconsumerd_fd = malloc(sizeof(struct kconsumerd_fd)); | |
595 | ||
596 | while (1) { | |
597 | high_prio = 0; | |
598 | num_hup = 0; | |
599 | ||
600 | /* | |
601 | * the ltt_fd_list has been updated, we need to update our | |
602 | * local array as well | |
603 | */ | |
242cd187 MD |
604 | pthread_mutex_lock(&kconsumerd_data.lock); |
605 | if (kconsumerd_data.need_update) { | |
1ce86c9a JD |
606 | if (pollfd != NULL) { |
607 | free(pollfd); | |
608 | pollfd = NULL; | |
609 | } | |
610 | if (local_kconsumerd_fd != NULL) { | |
611 | free(local_kconsumerd_fd); | |
612 | local_kconsumerd_fd = NULL; | |
613 | } | |
0237248c | 614 | |
1ce86c9a | 615 | /* allocate for all fds + 1 for the kconsumerd_poll_pipe */ |
242cd187 | 616 | pollfd = malloc((kconsumerd_data.fds_count + 1) * sizeof(struct pollfd)); |
1ce86c9a JD |
617 | if (pollfd == NULL) { |
618 | perror("pollfd malloc"); | |
242cd187 | 619 | pthread_mutex_unlock(&kconsumerd_data.lock); |
1ce86c9a JD |
620 | goto end; |
621 | } | |
0237248c | 622 | |
1ce86c9a | 623 | /* allocate for all fds + 1 for the kconsumerd_poll_pipe */ |
242cd187 | 624 | local_kconsumerd_fd = malloc((kconsumerd_data.fds_count + 1) * |
1ce86c9a JD |
625 | sizeof(struct kconsumerd_fd)); |
626 | if (local_kconsumerd_fd == NULL) { | |
627 | perror("local_kconsumerd_fd malloc"); | |
242cd187 | 628 | pthread_mutex_unlock(&kconsumerd_data.lock); |
1ce86c9a JD |
629 | goto end; |
630 | } | |
cb040cc1 | 631 | ret = kconsumerd_update_poll_array(ctx, &pollfd, local_kconsumerd_fd); |
1ce86c9a JD |
632 | if (ret < 0) { |
633 | ERR("Error in allocating pollfd or local_outfds"); | |
cb040cc1 | 634 | kconsumerd_send_error(ctx, KCONSUMERD_POLL_ERROR); |
242cd187 | 635 | pthread_mutex_unlock(&kconsumerd_data.lock); |
1ce86c9a JD |
636 | goto end; |
637 | } | |
638 | nb_fd = ret; | |
242cd187 | 639 | kconsumerd_data.need_update = 0; |
1ce86c9a | 640 | } |
242cd187 | 641 | pthread_mutex_unlock(&kconsumerd_data.lock); |
1ce86c9a JD |
642 | |
643 | /* poll on the array of fds */ | |
644 | DBG("polling on %d fd", nb_fd + 1); | |
645 | num_rdy = poll(pollfd, nb_fd + 1, kconsumerd_poll_timeout); | |
646 | DBG("poll num_rdy : %d", num_rdy); | |
647 | if (num_rdy == -1) { | |
648 | perror("Poll error"); | |
cb040cc1 | 649 | kconsumerd_send_error(ctx, KCONSUMERD_POLL_ERROR); |
1ce86c9a JD |
650 | goto end; |
651 | } else if (num_rdy == 0) { | |
652 | DBG("Polling thread timed out"); | |
653 | goto end; | |
654 | } | |
655 | ||
656 | /* No FDs and kconsumerd_quit, kconsumerd_cleanup the thread */ | |
657 | if (nb_fd == 0 && kconsumerd_quit == 1) { | |
658 | goto end; | |
659 | } | |
660 | ||
661 | /* | |
242cd187 MD |
662 | * If the kconsumerd_poll_pipe triggered poll go |
663 | * directly to the beginning of the loop to update the | |
664 | * array. We want to prioritize array update over | |
665 | * low-priority reads. | |
1ce86c9a | 666 | */ |
242cd187 | 667 | if (pollfd[nb_fd].revents == POLLIN) { |
1ce86c9a | 668 | DBG("kconsumerd_poll_pipe wake up"); |
cb040cc1 | 669 | tmp2 = read(ctx->kconsumerd_poll_pipe[0], &tmp, 1); |
f40799e8 DG |
670 | if (tmp2 < 0) { |
671 | perror("read kconsumerd poll"); | |
672 | } | |
1ce86c9a JD |
673 | continue; |
674 | } | |
675 | ||
676 | /* Take care of high priority channels first. */ | |
677 | for (i = 0; i < nb_fd; i++) { | |
678 | switch(pollfd[i].revents) { | |
679 | case POLLERR: | |
680 | ERR("Error returned in polling fd %d.", pollfd[i].fd); | |
681 | kconsumerd_del_fd(local_kconsumerd_fd[i]); | |
1ce86c9a JD |
682 | num_hup++; |
683 | break; | |
684 | case POLLHUP: | |
685 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); | |
686 | kconsumerd_del_fd(local_kconsumerd_fd[i]); | |
1ce86c9a JD |
687 | num_hup++; |
688 | break; | |
689 | case POLLNVAL: | |
690 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); | |
691 | kconsumerd_del_fd(local_kconsumerd_fd[i]); | |
1ce86c9a JD |
692 | num_hup++; |
693 | break; | |
694 | case POLLPRI: | |
695 | DBG("Urgent read on fd %d", pollfd[i].fd); | |
696 | high_prio = 1; | |
cb040cc1 | 697 | ret = ctx->on_buffer_ready(local_kconsumerd_fd[i]); |
1ce86c9a JD |
698 | /* it's ok to have an unavailable sub-buffer */ |
699 | if (ret == EAGAIN) { | |
700 | ret = 0; | |
701 | } | |
702 | break; | |
703 | } | |
704 | } | |
705 | ||
706 | /* If every buffer FD has hung up, we end the read loop here */ | |
707 | if (nb_fd > 0 && num_hup == nb_fd) { | |
708 | DBG("every buffer FD has hung up\n"); | |
709 | if (kconsumerd_quit == 1) { | |
710 | goto end; | |
711 | } | |
712 | continue; | |
713 | } | |
714 | ||
715 | /* Take care of low priority channels. */ | |
716 | if (high_prio == 0) { | |
717 | for (i = 0; i < nb_fd; i++) { | |
718 | if (pollfd[i].revents == POLLIN) { | |
719 | DBG("Normal read on fd %d", pollfd[i].fd); | |
cb040cc1 | 720 | ret = ctx->on_buffer_ready(local_kconsumerd_fd[i]); |
1ce86c9a JD |
721 | /* it's ok to have an unavailable subbuffer */ |
722 | if (ret == EAGAIN) { | |
723 | ret = 0; | |
724 | } | |
725 | } | |
726 | } | |
727 | } | |
728 | } | |
729 | end: | |
730 | DBG("polling thread exiting"); | |
731 | if (pollfd != NULL) { | |
732 | free(pollfd); | |
733 | pollfd = NULL; | |
734 | } | |
735 | if (local_kconsumerd_fd != NULL) { | |
736 | free(local_kconsumerd_fd); | |
737 | local_kconsumerd_fd = NULL; | |
738 | } | |
1ce86c9a JD |
739 | return NULL; |
740 | } | |
741 | ||
742 | /* | |
cb040cc1 | 743 | * kconsumerd_create |
1ce86c9a | 744 | * |
4de84ad9 | 745 | * initialise the necessary environnement : |
cb040cc1 | 746 | * - create a new context |
4de84ad9 JD |
747 | * - create the poll_pipe |
748 | * - create the should_quit pipe (for signal handler) | |
cb040cc1 JD |
749 | * - create the thread pipe (for splice) |
750 | * Takes a function pointer as argument, this function is called when data is | |
751 | * available on a buffer. This function is responsible to do the | |
752 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the | |
753 | * buffer configuration and then kernctl_put_next_subbuf at the end. | |
754 | * Returns a pointer to the new context or NULL on error. | |
1ce86c9a | 755 | */ |
cb040cc1 JD |
756 | struct kconsumerd_local_data *kconsumerd_create( |
757 | int (*buffer_ready)(struct kconsumerd_fd *kconsumerd_fd)) | |
1ce86c9a | 758 | { |
4de84ad9 | 759 | int ret; |
cb040cc1 | 760 | struct kconsumerd_local_data *ctx; |
4de84ad9 | 761 | |
cb040cc1 JD |
762 | ctx = malloc(sizeof(struct kconsumerd_local_data)); |
763 | if (ctx == NULL) { | |
764 | perror("allocating context"); | |
765 | goto end; | |
766 | } | |
767 | ||
768 | ctx->on_buffer_ready = buffer_ready; | |
4de84ad9 | 769 | |
cb040cc1 | 770 | ret = pipe(ctx->kconsumerd_poll_pipe); |
4de84ad9 JD |
771 | if (ret < 0) { |
772 | perror("Error creating poll pipe"); | |
cb040cc1 | 773 | ctx = NULL; |
4de84ad9 JD |
774 | goto end; |
775 | } | |
776 | ||
cb040cc1 | 777 | ret = pipe(ctx->kconsumerd_should_quit); |
4de84ad9 JD |
778 | if (ret < 0) { |
779 | perror("Error creating recv pipe"); | |
cb040cc1 JD |
780 | ctx = NULL; |
781 | goto end; | |
782 | } | |
783 | ||
784 | ret = pipe(ctx->kconsumerd_thread_pipe); | |
785 | if (ret < 0) { | |
786 | perror("Error creating thread pipe"); | |
787 | ctx = NULL; | |
4de84ad9 JD |
788 | goto end; |
789 | } | |
790 | ||
791 | end: | |
cb040cc1 JD |
792 | return ctx; |
793 | } | |
794 | ||
795 | /* | |
796 | * kconsumerd_destroy | |
797 | * | |
798 | * Close all fds associated with the instance and free the context | |
799 | */ | |
800 | void kconsumerd_destroy(struct kconsumerd_local_data *ctx) | |
801 | { | |
802 | close(ctx->kconsumerd_error_socket); | |
803 | close(ctx->kconsumerd_thread_pipe[0]); | |
804 | close(ctx->kconsumerd_thread_pipe[1]); | |
805 | close(ctx->kconsumerd_poll_pipe[0]); | |
806 | close(ctx->kconsumerd_poll_pipe[1]); | |
807 | close(ctx->kconsumerd_should_quit[0]); | |
808 | close(ctx->kconsumerd_should_quit[1]); | |
809 | unlink(ctx->kconsumerd_command_sock_path); | |
810 | free(ctx); | |
811 | ctx = NULL; | |
1ce86c9a JD |
812 | } |
813 | ||
814 | /* | |
815 | * kconsumerd_thread_receive_fds | |
816 | * | |
817 | * This thread listens on the consumerd socket and | |
818 | * receives the file descriptors from ltt-sessiond | |
819 | */ | |
820 | void *kconsumerd_thread_receive_fds(void *data) | |
821 | { | |
822 | int sock, client_socket, ret; | |
823 | struct lttcomm_kconsumerd_header tmp; | |
4de84ad9 JD |
824 | /* |
825 | * structure to poll for incoming data on communication socket | |
826 | * avoids making blocking sockets | |
827 | */ | |
828 | struct pollfd kconsumerd_sockpoll[2]; | |
cb040cc1 | 829 | struct kconsumerd_local_data *ctx = data; |
4de84ad9 | 830 | |
1ce86c9a | 831 | |
cb040cc1 JD |
832 | DBG("Creating command socket %s", ctx->kconsumerd_command_sock_path); |
833 | unlink(ctx->kconsumerd_command_sock_path); | |
834 | client_socket = lttcomm_create_unix_sock(ctx->kconsumerd_command_sock_path); | |
1ce86c9a JD |
835 | if (client_socket < 0) { |
836 | ERR("Cannot create command socket"); | |
837 | goto end; | |
838 | } | |
839 | ||
840 | ret = lttcomm_listen_unix_sock(client_socket); | |
841 | if (ret < 0) { | |
842 | goto end; | |
843 | } | |
844 | ||
845 | DBG("Sending ready command to ltt-sessiond"); | |
cb040cc1 | 846 | ret = kconsumerd_send_error(ctx, KCONSUMERD_COMMAND_SOCK_READY); |
1ce86c9a JD |
847 | if (ret < 0) { |
848 | ERR("Error sending ready command to ltt-sessiond"); | |
849 | goto end; | |
850 | } | |
851 | ||
4de84ad9 JD |
852 | ret = fcntl(client_socket, F_SETFL, O_NONBLOCK); |
853 | if (ret < 0) { | |
854 | perror("fcntl O_NONBLOCK"); | |
855 | goto end; | |
856 | } | |
857 | ||
858 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ | |
cb040cc1 | 859 | kconsumerd_sockpoll[0].fd = ctx->kconsumerd_should_quit[0]; |
4de84ad9 JD |
860 | kconsumerd_sockpoll[0].events = POLLIN | POLLPRI; |
861 | kconsumerd_sockpoll[1].fd = client_socket; | |
862 | kconsumerd_sockpoll[1].events = POLLIN | POLLPRI; | |
863 | ||
864 | if (kconsumerd_poll_socket(kconsumerd_sockpoll) < 0) { | |
865 | goto end; | |
866 | } | |
867 | DBG("Connection on client_socket"); | |
868 | ||
1ce86c9a JD |
869 | /* Blocking call, waiting for transmission */ |
870 | sock = lttcomm_accept_unix_sock(client_socket); | |
871 | if (sock <= 0) { | |
872 | WARN("On accept"); | |
873 | goto end; | |
874 | } | |
4de84ad9 JD |
875 | ret = fcntl(sock, F_SETFL, O_NONBLOCK); |
876 | if (ret < 0) { | |
877 | perror("fcntl O_NONBLOCK"); | |
878 | goto end; | |
879 | } | |
880 | ||
881 | /* update the polling structure to poll on the established socket */ | |
882 | kconsumerd_sockpoll[1].fd = sock; | |
883 | kconsumerd_sockpoll[1].events = POLLIN | POLLPRI; | |
884 | ||
1ce86c9a | 885 | while (1) { |
4de84ad9 JD |
886 | if (kconsumerd_poll_socket(kconsumerd_sockpoll) < 0) { |
887 | goto end; | |
888 | } | |
889 | DBG("Incoming fds on sock"); | |
890 | ||
1ce86c9a JD |
891 | /* We first get the number of fd we are about to receive */ |
892 | ret = lttcomm_recv_unix_sock(sock, &tmp, | |
893 | sizeof(struct lttcomm_kconsumerd_header)); | |
894 | if (ret <= 0) { | |
895 | ERR("Communication interrupted on command socket"); | |
896 | goto end; | |
897 | } | |
898 | if (tmp.cmd_type == STOP) { | |
899 | DBG("Received STOP command"); | |
900 | goto end; | |
901 | } | |
3dcd2721 MD |
902 | if (kconsumerd_quit) { |
903 | DBG("kconsumerd_thread_receive_fds received quit from signal"); | |
904 | goto end; | |
905 | } | |
4de84ad9 | 906 | |
1ce86c9a | 907 | /* we received a command to add or update fds */ |
cb040cc1 | 908 | ret = kconsumerd_consumerd_recv_fd(ctx, sock, kconsumerd_sockpoll, |
4de84ad9 | 909 | tmp.payload_size, tmp.cmd_type); |
8b270bdb | 910 | if (ret < 0) { |
1ce86c9a JD |
911 | ERR("Receiving the FD, exiting"); |
912 | goto end; | |
913 | } | |
4de84ad9 | 914 | DBG("received fds on sock"); |
1ce86c9a JD |
915 | } |
916 | ||
917 | end: | |
918 | DBG("kconsumerd_thread_receive_fds exiting"); | |
919 | ||
920 | /* | |
921 | * when all fds have hung up, the polling thread | |
922 | * can exit cleanly | |
923 | */ | |
924 | kconsumerd_quit = 1; | |
925 | ||
926 | /* | |
927 | * 2s of grace period, if no polling events occur during | |
928 | * this period, the polling thread will exit even if there | |
929 | * are still open FDs (should not happen, but safety mechanism). | |
930 | */ | |
931 | kconsumerd_poll_timeout = KCONSUMERD_POLL_GRACE_PERIOD; | |
932 | ||
933 | /* wake up the polling thread */ | |
cb040cc1 | 934 | ret = write(ctx->kconsumerd_poll_pipe[1], "4", 1); |
1ce86c9a JD |
935 | if (ret < 0) { |
936 | perror("poll pipe write"); | |
937 | } | |
938 | return NULL; | |
939 | } | |
940 | ||
941 | /* | |
942 | * kconsumerd_cleanup | |
943 | * | |
cb040cc1 JD |
944 | * Close all the tracefiles and stream fds, should be called when all |
945 | * instances are destroyed. | |
1ce86c9a | 946 | */ |
3dcd2721 | 947 | void kconsumerd_cleanup(void) |
1ce86c9a | 948 | { |
fbf10601 | 949 | struct kconsumerd_fd *iter, *tmp; |
1ce86c9a | 950 | |
3dcd2721 MD |
951 | /* |
952 | * close all outfd. Called when there are no more threads | |
953 | * running (after joining on the threads), no need to protect | |
954 | * list iteration with mutex. | |
955 | */ | |
fbf10601 | 956 | cds_list_for_each_entry_safe(iter, tmp, &kconsumerd_data.fd_list.head, list) { |
1ce86c9a JD |
957 | kconsumerd_del_fd(iter); |
958 | } | |
959 | } | |
960 | ||
3dcd2721 | 961 | /* |
4de84ad9 JD |
962 | * kconsumerd_should_exit |
963 | * | |
3dcd2721 MD |
964 | * Called from signal handler. |
965 | */ | |
cb040cc1 | 966 | void kconsumerd_should_exit(struct kconsumerd_local_data *ctx) |
3dcd2721 | 967 | { |
4de84ad9 | 968 | int ret; |
3dcd2721 | 969 | kconsumerd_quit = 1; |
cb040cc1 | 970 | ret = write(ctx->kconsumerd_should_quit[1], "4", 1); |
f40799e8 DG |
971 | if (ret < 0) { |
972 | perror("write kconsumerd quit"); | |
973 | } | |
3dcd2721 MD |
974 | } |
975 | ||
1ce86c9a JD |
976 | /* |
977 | * kconsumerd_send_error | |
978 | * | |
979 | * send return code to ltt-sessiond | |
980 | */ | |
cb040cc1 | 981 | int kconsumerd_send_error(struct kconsumerd_local_data *ctx, enum lttcomm_return_code cmd) |
1ce86c9a | 982 | { |
cb040cc1 JD |
983 | if (ctx->kconsumerd_error_socket > 0) { |
984 | return lttcomm_send_unix_sock(ctx->kconsumerd_error_socket, &cmd, | |
1ce86c9a JD |
985 | sizeof(enum lttcomm_sessiond_command)); |
986 | } | |
987 | ||
988 | return 0; | |
989 | } |