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d159ac37 AH |
1 | /* Copyright (C) 2009 Pierre-Marc Fournier |
2 | * 2010 Alexis Halle | |
3 | * | |
4 | * This library is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU Lesser General Public | |
6 | * License as published by the Free Software Foundation; either | |
7 | * version 2.1 of the License, or (at your option) any later version. | |
8 | * | |
9 | * This library 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 GNU | |
12 | * Lesser General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU Lesser General Public | |
15 | * License along with this library; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
17 | */ | |
18 | ||
19 | #define _GNU_SOURCE | |
20 | ||
4723ca09 | 21 | #include <sys/epoll.h> |
d159ac37 | 22 | #include <sys/shm.h> |
4723ca09 NC |
23 | #include <sys/types.h> |
24 | #include <sys/stat.h> | |
d159ac37 AH |
25 | #include <unistd.h> |
26 | #include <pthread.h> | |
27 | #include <signal.h> | |
28 | ||
29 | #include <stdlib.h> | |
30 | #include <stdio.h> | |
31 | #include <string.h> | |
32 | #include <errno.h> | |
33 | #include <assert.h> | |
34 | ||
d6c9f207 AH |
35 | #include <ust/ustd.h> |
36 | #include "lowlevel.h" | |
d159ac37 AH |
37 | #include "usterr.h" |
38 | #include "ustcomm.h" | |
39 | ||
d159ac37 AH |
40 | #define GET_SUBBUF_OK 1 |
41 | #define GET_SUBBUF_DONE 0 | |
42 | #define GET_SUBBUF_DIED 2 | |
43 | ||
44 | #define PUT_SUBBUF_OK 1 | |
45 | #define PUT_SUBBUF_DIED 0 | |
46 | #define PUT_SUBBUF_PUSHED 2 | |
47 | #define PUT_SUBBUF_DONE 3 | |
48 | ||
49 | #define UNIX_PATH_MAX 108 | |
50 | ||
72098143 | 51 | static int get_subbuffer(struct buffer_info *buf) |
d159ac37 | 52 | { |
72098143 NC |
53 | struct ustcomm_header _send_hdr, *send_hdr; |
54 | struct ustcomm_header _recv_hdr, *recv_hdr; | |
55 | struct ustcomm_buffer_info _send_msg, _recv_msg; | |
56 | struct ustcomm_buffer_info *send_msg, *recv_msg; | |
d159ac37 AH |
57 | int result; |
58 | ||
72098143 NC |
59 | send_hdr = &_send_hdr; |
60 | recv_hdr = &_recv_hdr; | |
61 | send_msg = &_send_msg; | |
62 | recv_msg = &_recv_msg; | |
4723ca09 | 63 | |
d89b8191 | 64 | result = ustcomm_pack_buffer_info(send_hdr, send_msg, buf->trace, |
72098143 NC |
65 | buf->channel, buf->channel_cpu); |
66 | if (result < 0) { | |
67 | return result; | |
d159ac37 AH |
68 | } |
69 | ||
72098143 NC |
70 | send_hdr->command = GET_SUBBUFFER; |
71 | ||
72 | result = ustcomm_req(buf->app_sock, send_hdr, (char *)send_msg, | |
73 | recv_hdr, (char *)recv_msg); | |
74 | if ((result < 0 && (errno == ECONNRESET || errno == EPIPE)) || | |
75 | result == 0) { | |
76 | DBG("app died while being traced"); | |
77 | return GET_SUBBUF_DIED; | |
78 | } else if (result < 0) { | |
79 | ERR("get_subbuffer: ustcomm_req failed"); | |
80 | return result; | |
d159ac37 AH |
81 | } |
82 | ||
72098143 | 83 | if (!recv_hdr->result) { |
d159ac37 | 84 | DBG("got subbuffer %s", buf->name); |
72098143 NC |
85 | buf->consumed_old = recv_msg->consumed_old; |
86 | return GET_SUBBUF_OK; | |
87 | } else if (recv_hdr->result == -ENODATA) { | |
88 | DBG("For buffer %s, the trace was not found. This likely means" | |
89 | " it was destroyed by the user.", buf->name); | |
90 | return GET_SUBBUF_DIED; | |
d159ac37 AH |
91 | } |
92 | ||
72098143 NC |
93 | DBG("error getting subbuffer %s", buf->name); |
94 | return recv_hdr->result; | |
d159ac37 AH |
95 | } |
96 | ||
72098143 | 97 | static int put_subbuffer(struct buffer_info *buf) |
d159ac37 | 98 | { |
72098143 NC |
99 | struct ustcomm_header _send_hdr, *send_hdr; |
100 | struct ustcomm_header _recv_hdr, *recv_hdr; | |
101 | struct ustcomm_buffer_info _send_msg, *send_msg; | |
d159ac37 AH |
102 | int result; |
103 | ||
72098143 NC |
104 | send_hdr = &_send_hdr; |
105 | recv_hdr = &_recv_hdr; | |
106 | send_msg = &_send_msg; | |
d159ac37 | 107 | |
d89b8191 | 108 | result = ustcomm_pack_buffer_info(send_hdr, send_msg, buf->trace, |
72098143 NC |
109 | buf->channel, buf->channel_cpu); |
110 | if (result < 0) { | |
111 | return result; | |
d159ac37 AH |
112 | } |
113 | ||
72098143 NC |
114 | send_hdr->command = PUT_SUBBUFFER; |
115 | send_msg->consumed_old = buf->consumed_old; | |
d159ac37 | 116 | |
72098143 NC |
117 | result = ustcomm_req(buf->app_sock, send_hdr, (char *)send_msg, |
118 | recv_hdr, NULL); | |
119 | if ((result < 0 && (errno == ECONNRESET || errno == EPIPE)) || | |
120 | result == 0) { | |
121 | DBG("app died while being traced"); | |
122 | return PUT_SUBBUF_DIED; | |
123 | } else if (result < 0) { | |
124 | ERR("put_subbuffer: ustcomm_req failed"); | |
125 | return result; | |
126 | } | |
d159ac37 | 127 | |
72098143 NC |
128 | if (!recv_hdr->result) { |
129 | DBG("put subbuffer %s", buf->name); | |
130 | return PUT_SUBBUF_OK; | |
131 | } else if (recv_hdr->result == -ENODATA) { | |
132 | DBG("For buffer %s, the trace was not found. This likely means" | |
133 | " it was destroyed by the user.", buf->name); | |
134 | return PUT_SUBBUF_DIED; | |
135 | } | |
d159ac37 | 136 | |
72098143 NC |
137 | DBG("error getting subbuffer %s", buf->name); |
138 | return recv_hdr->result; | |
d159ac37 AH |
139 | } |
140 | ||
141 | void decrement_active_buffers(void *arg) | |
142 | { | |
143 | struct libustd_instance *instance = arg; | |
144 | pthread_mutex_lock(&instance->mutex); | |
145 | instance->active_buffers--; | |
146 | pthread_mutex_unlock(&instance->mutex); | |
147 | } | |
148 | ||
72098143 | 149 | static int get_pidunique(int sock, s64 *pidunique) |
d159ac37 | 150 | { |
72098143 NC |
151 | struct ustcomm_header _send_hdr, *send_hdr; |
152 | struct ustcomm_header _recv_hdr, *recv_hdr; | |
153 | struct ustcomm_pidunique _recv_msg, *recv_msg; | |
d159ac37 | 154 | int result; |
d159ac37 | 155 | |
72098143 NC |
156 | send_hdr = &_send_hdr; |
157 | recv_hdr = &_recv_hdr; | |
158 | recv_msg = &_recv_msg; | |
159 | ||
160 | memset(send_hdr, 0, sizeof(*send_hdr)); | |
161 | ||
162 | send_hdr->command = GET_PIDUNIQUE; | |
163 | result = ustcomm_req(sock, send_hdr, NULL, recv_hdr, (char *)recv_msg); | |
164 | if (result < 1) { | |
165 | return -ENOTCONN; | |
166 | } | |
167 | if (recv_hdr->result < 0) { | |
168 | ERR("App responded with error: %s", strerror(recv_hdr->result)); | |
169 | return recv_hdr->result; | |
d159ac37 AH |
170 | } |
171 | ||
72098143 | 172 | *pidunique = recv_msg->pidunique; |
d159ac37 | 173 | |
72098143 NC |
174 | return 0; |
175 | } | |
176 | ||
177 | static int get_buf_shmid_pipe_fd(int sock, struct buffer_info *buf, | |
178 | int *buf_shmid, int *buf_struct_shmid, | |
179 | int *buf_pipe_fd) | |
180 | { | |
181 | struct ustcomm_header _send_hdr, *send_hdr; | |
182 | struct ustcomm_header _recv_hdr, *recv_hdr; | |
183 | struct ustcomm_buffer_info _send_msg, *send_msg; | |
184 | struct ustcomm_buffer_info _recv_msg, *recv_msg; | |
185 | int result, recv_pipe_fd; | |
186 | ||
187 | send_hdr = &_send_hdr; | |
188 | recv_hdr = &_recv_hdr; | |
189 | send_msg = &_send_msg; | |
190 | recv_msg = &_recv_msg; | |
191 | ||
d89b8191 | 192 | result = ustcomm_pack_buffer_info(send_hdr, send_msg, buf->trace, |
72098143 NC |
193 | buf->channel, buf->channel_cpu); |
194 | if (result < 0) { | |
195 | ERR("Failed to pack buffer info"); | |
196 | return result; | |
d159ac37 AH |
197 | } |
198 | ||
72098143 NC |
199 | send_hdr->command = GET_BUF_SHMID_PIPE_FD; |
200 | ||
201 | result = ustcomm_send(sock, send_hdr, (char *)send_msg); | |
202 | if (result < 1) { | |
203 | ERR("Failed to send request"); | |
204 | return -ENOTCONN; | |
08b8805e | 205 | } |
72098143 NC |
206 | result = ustcomm_recv_fd(sock, recv_hdr, (char *)recv_msg, &recv_pipe_fd); |
207 | if (result < 1) { | |
208 | ERR("Failed to receive message and fd"); | |
209 | return -ENOTCONN; | |
d159ac37 | 210 | } |
72098143 NC |
211 | if (recv_hdr->result < 0) { |
212 | ERR("App responded with error %s", strerror(recv_hdr->result)); | |
213 | return recv_hdr->result; | |
d159ac37 AH |
214 | } |
215 | ||
72098143 NC |
216 | *buf_shmid = recv_msg->buf_shmid; |
217 | *buf_struct_shmid = recv_msg->buf_struct_shmid; | |
218 | *buf_pipe_fd = recv_pipe_fd; | |
d159ac37 | 219 | |
72098143 NC |
220 | return 0; |
221 | } | |
222 | ||
223 | static int get_subbuf_num_size(int sock, struct buffer_info *buf, | |
224 | int *subbuf_num, int *subbuf_size) | |
225 | { | |
226 | struct ustcomm_header _send_hdr, *send_hdr; | |
227 | struct ustcomm_header _recv_hdr, *recv_hdr; | |
228 | struct ustcomm_channel_info _send_msg, *send_msg; | |
229 | struct ustcomm_channel_info _recv_msg, *recv_msg; | |
230 | int result; | |
231 | ||
232 | send_hdr = &_send_hdr; | |
233 | recv_hdr = &_recv_hdr; | |
234 | send_msg = &_send_msg; | |
235 | recv_msg = &_recv_msg; | |
236 | ||
d89b8191 | 237 | result = ustcomm_pack_channel_info(send_hdr, send_msg, buf->trace, |
72098143 NC |
238 | buf->channel); |
239 | if (result < 0) { | |
240 | return result; | |
d159ac37 | 241 | } |
72098143 NC |
242 | |
243 | send_hdr->command = GET_SUBBUF_NUM_SIZE; | |
244 | ||
245 | result = ustcomm_req(sock, send_hdr, (char *)send_msg, | |
246 | recv_hdr, (char *)recv_msg); | |
247 | if (result < 1) { | |
248 | return -ENOTCONN; | |
d159ac37 AH |
249 | } |
250 | ||
72098143 NC |
251 | *subbuf_num = recv_msg->subbuf_num; |
252 | *subbuf_size = recv_msg->subbuf_size; | |
253 | ||
254 | return recv_hdr->result; | |
255 | } | |
256 | ||
257 | ||
258 | static int notify_buffer_mapped(int sock, struct buffer_info *buf) | |
259 | { | |
260 | struct ustcomm_header _send_hdr, *send_hdr; | |
261 | struct ustcomm_header _recv_hdr, *recv_hdr; | |
262 | struct ustcomm_buffer_info _send_msg, *send_msg; | |
263 | int result; | |
264 | ||
265 | send_hdr = &_send_hdr; | |
266 | recv_hdr = &_recv_hdr; | |
267 | send_msg = &_send_msg; | |
268 | ||
d89b8191 | 269 | result = ustcomm_pack_buffer_info(send_hdr, send_msg, buf->trace, |
72098143 NC |
270 | buf->channel, buf->channel_cpu); |
271 | if (result < 0) { | |
272 | return result; | |
d159ac37 | 273 | } |
d159ac37 | 274 | |
72098143 NC |
275 | send_hdr->command = NOTIFY_BUF_MAPPED; |
276 | ||
277 | result = ustcomm_req(sock, send_hdr, (char *)send_msg, | |
278 | recv_hdr, NULL); | |
279 | if (result < 1) { | |
280 | return -ENOTCONN; | |
08b8805e | 281 | } |
72098143 NC |
282 | |
283 | return recv_hdr->result; | |
284 | } | |
285 | ||
286 | ||
287 | struct buffer_info *connect_buffer(struct libustd_instance *instance, pid_t pid, | |
d89b8191 NC |
288 | const char *trace, const char *channel, |
289 | int channel_cpu) | |
72098143 NC |
290 | { |
291 | struct buffer_info *buf; | |
292 | int result; | |
293 | struct shmid_ds shmds; | |
294 | ||
295 | buf = (struct buffer_info *) zmalloc(sizeof(struct buffer_info)); | |
296 | if(buf == NULL) { | |
297 | ERR("add_buffer: insufficient memory"); | |
d159ac37 AH |
298 | return NULL; |
299 | } | |
d159ac37 | 300 | |
d89b8191 NC |
301 | buf->trace = strdup(trace); |
302 | if (!buf->trace) { | |
303 | goto free_buf; | |
304 | } | |
305 | ||
72098143 NC |
306 | buf->channel = strdup(channel); |
307 | if (!buf->channel) { | |
d89b8191 | 308 | goto free_buf_trace; |
d159ac37 | 309 | } |
d159ac37 | 310 | |
72098143 NC |
311 | result = asprintf(&buf->name, "%s_%d", channel, channel_cpu); |
312 | if (result < 0 || buf->name == NULL) { | |
313 | goto free_buf_channel; | |
08b8805e | 314 | } |
72098143 NC |
315 | |
316 | buf->channel_cpu = channel_cpu; | |
317 | buf->pid = pid; | |
318 | ||
319 | result = ustcomm_connect_app(buf->pid, &buf->app_sock); | |
320 | if(result) { | |
321 | WARN("unable to connect to process, it probably died before we were able to connect"); | |
322 | goto free_buf_name; | |
d159ac37 | 323 | } |
72098143 NC |
324 | |
325 | /* get pidunique */ | |
326 | result = get_pidunique(buf->app_sock, &buf->pidunique); | |
327 | if (result < 0) { | |
328 | ERR("Failed to get pidunique"); | |
329 | goto close_app_sock; | |
330 | } | |
331 | ||
332 | /* get shmid and pipe fd */ | |
333 | result = get_buf_shmid_pipe_fd(buf->app_sock, buf, &buf->shmid, | |
334 | &buf->bufstruct_shmid, &buf->pipe_fd); | |
335 | if (result < 0) { | |
336 | ERR("Failed to get buf_shmid and pipe_fd"); | |
337 | goto close_app_sock; | |
338 | } else { | |
339 | struct stat temp; | |
340 | fstat(buf->pipe_fd, &temp); | |
341 | if (!S_ISFIFO(temp.st_mode)) { | |
342 | ERR("Didn't receive a fifo from the app"); | |
343 | goto close_app_sock; | |
344 | } | |
d159ac37 AH |
345 | } |
346 | ||
72098143 NC |
347 | |
348 | /* get number of subbufs and subbuf size */ | |
349 | result = get_subbuf_num_size(buf->app_sock, buf, &buf->n_subbufs, | |
350 | &buf->subbuf_size); | |
351 | if (result < 0) { | |
352 | ERR("Failed to get subbuf number and size"); | |
353 | goto close_fifo; | |
d159ac37 | 354 | } |
d159ac37 AH |
355 | |
356 | /* attach memory */ | |
357 | buf->mem = shmat(buf->shmid, NULL, 0); | |
358 | if(buf->mem == (void *) 0) { | |
359 | PERROR("shmat"); | |
72098143 | 360 | goto close_fifo; |
d159ac37 AH |
361 | } |
362 | DBG("successfully attached buffer memory"); | |
363 | ||
364 | buf->bufstruct_mem = shmat(buf->bufstruct_shmid, NULL, 0); | |
365 | if(buf->bufstruct_mem == (void *) 0) { | |
366 | PERROR("shmat"); | |
72098143 | 367 | goto shmdt_mem; |
d159ac37 AH |
368 | } |
369 | DBG("successfully attached buffer bufstruct memory"); | |
370 | ||
371 | /* obtain info on the memory segment */ | |
372 | result = shmctl(buf->shmid, IPC_STAT, &shmds); | |
373 | if(result == -1) { | |
374 | PERROR("shmctl"); | |
72098143 | 375 | goto shmdt_bufstruct_mem; |
d159ac37 AH |
376 | } |
377 | buf->memlen = shmds.shm_segsz; | |
378 | ||
72098143 NC |
379 | /* Notify the application that we have mapped the buffer */ |
380 | result = notify_buffer_mapped(buf->app_sock, buf); | |
381 | if (result < 0) { | |
382 | goto shmdt_bufstruct_mem; | |
4723ca09 | 383 | } |
72098143 | 384 | |
d159ac37 AH |
385 | if(instance->callbacks->on_open_buffer) |
386 | instance->callbacks->on_open_buffer(instance->callbacks, buf); | |
387 | ||
388 | pthread_mutex_lock(&instance->mutex); | |
389 | instance->active_buffers++; | |
390 | pthread_mutex_unlock(&instance->mutex); | |
391 | ||
392 | return buf; | |
393 | ||
72098143 NC |
394 | shmdt_bufstruct_mem: |
395 | shmdt(buf->bufstruct_mem); | |
396 | ||
397 | shmdt_mem: | |
398 | shmdt(buf->mem); | |
399 | ||
400 | close_fifo: | |
401 | close(buf->pipe_fd); | |
402 | ||
403 | close_app_sock: | |
404 | close(buf->app_sock); | |
405 | ||
406 | free_buf_name: | |
407 | free(buf->name); | |
408 | ||
409 | free_buf_channel: | |
410 | free(buf->channel); | |
411 | ||
d89b8191 NC |
412 | free_buf_trace: |
413 | free(buf->trace); | |
414 | ||
72098143 | 415 | free_buf: |
d159ac37 AH |
416 | free(buf); |
417 | return NULL; | |
418 | } | |
419 | ||
420 | static void destroy_buffer(struct libustd_callbacks *callbacks, | |
421 | struct buffer_info *buf) | |
422 | { | |
423 | int result; | |
424 | ||
4723ca09 | 425 | result = close(buf->app_sock); |
d159ac37 AH |
426 | if(result == -1) { |
427 | WARN("problem calling ustcomm_close_app"); | |
428 | } | |
429 | ||
430 | result = shmdt(buf->mem); | |
431 | if(result == -1) { | |
432 | PERROR("shmdt"); | |
433 | } | |
434 | ||
435 | result = shmdt(buf->bufstruct_mem); | |
436 | if(result == -1) { | |
437 | PERROR("shmdt"); | |
438 | } | |
439 | ||
440 | if(callbacks->on_close_buffer) | |
441 | callbacks->on_close_buffer(callbacks, buf); | |
442 | ||
443 | free(buf); | |
444 | } | |
445 | ||
446 | int consumer_loop(struct libustd_instance *instance, struct buffer_info *buf) | |
447 | { | |
4723ca09 NC |
448 | int result, read_result; |
449 | char read_buf; | |
d159ac37 AH |
450 | |
451 | pthread_cleanup_push(decrement_active_buffers, instance); | |
452 | ||
453 | for(;;) { | |
4723ca09 | 454 | read_result = read(buf->pipe_fd, &read_buf, 1); |
d159ac37 | 455 | /* get the subbuffer */ |
4723ca09 NC |
456 | if (read_result == 1) { |
457 | result = get_subbuffer(buf); | |
72098143 | 458 | if (result < 0) { |
4723ca09 NC |
459 | ERR("error getting subbuffer"); |
460 | continue; | |
461 | } else if (result == GET_SUBBUF_DIED) { | |
462 | finish_consuming_dead_subbuffer(instance->callbacks, buf); | |
463 | break; | |
464 | } | |
465 | } else if ((read_result == -1 && (errno == ECONNRESET || errno == EPIPE)) || | |
466 | result == 0) { | |
467 | DBG("App died while being traced"); | |
d159ac37 AH |
468 | finish_consuming_dead_subbuffer(instance->callbacks, buf); |
469 | break; | |
470 | } | |
471 | ||
472 | if(instance->callbacks->on_read_subbuffer) | |
473 | instance->callbacks->on_read_subbuffer(instance->callbacks, buf); | |
474 | ||
475 | /* put the subbuffer */ | |
476 | result = put_subbuffer(buf); | |
477 | if(result == -1) { | |
478 | ERR("unknown error putting subbuffer (channel=%s)", buf->name); | |
479 | break; | |
480 | } | |
481 | else if(result == PUT_SUBBUF_PUSHED) { | |
482 | ERR("Buffer overflow (channel=%s), reader pushed. This channel will not be usable passed this point.", buf->name); | |
483 | break; | |
484 | } | |
485 | else if(result == PUT_SUBBUF_DIED) { | |
486 | DBG("application died while putting subbuffer"); | |
487 | /* Skip the first subbuffer. We are not sure it is trustable | |
488 | * because the put_subbuffer() did not complete. | |
489 | */ | |
490 | if(instance->callbacks->on_put_error) | |
491 | instance->callbacks->on_put_error(instance->callbacks, buf); | |
492 | ||
493 | finish_consuming_dead_subbuffer(instance->callbacks, buf); | |
494 | break; | |
495 | } | |
496 | else if(result == PUT_SUBBUF_DONE) { | |
497 | /* Done with this subbuffer */ | |
498 | /* FIXME: add a case where this branch is used? Upon | |
499 | * normal trace termination, at put_subbuf time, a | |
500 | * special last-subbuffer code could be returned by | |
501 | * the listener. | |
502 | */ | |
503 | break; | |
504 | } | |
505 | else if(result == PUT_SUBBUF_OK) { | |
506 | } | |
507 | } | |
508 | ||
509 | DBG("thread for buffer %s is stopping", buf->name); | |
510 | ||
511 | /* FIXME: destroy, unalloc... */ | |
512 | ||
513 | pthread_cleanup_pop(1); | |
514 | ||
515 | return 0; | |
516 | } | |
517 | ||
518 | struct consumer_thread_args { | |
519 | pid_t pid; | |
d89b8191 | 520 | const char *trace; |
72098143 NC |
521 | const char *channel; |
522 | int channel_cpu; | |
d159ac37 AH |
523 | struct libustd_instance *instance; |
524 | }; | |
525 | ||
526 | void *consumer_thread(void *arg) | |
527 | { | |
528 | struct buffer_info *buf; | |
529 | struct consumer_thread_args *args = (struct consumer_thread_args *) arg; | |
530 | int result; | |
531 | sigset_t sigset; | |
532 | ||
d159ac37 AH |
533 | if(args->instance->callbacks->on_new_thread) |
534 | args->instance->callbacks->on_new_thread(args->instance->callbacks); | |
535 | ||
536 | /* Block signals that should be handled by the main thread. */ | |
537 | result = sigemptyset(&sigset); | |
538 | if(result == -1) { | |
539 | PERROR("sigemptyset"); | |
540 | goto end; | |
541 | } | |
542 | result = sigaddset(&sigset, SIGTERM); | |
543 | if(result == -1) { | |
544 | PERROR("sigaddset"); | |
545 | goto end; | |
546 | } | |
547 | result = sigaddset(&sigset, SIGINT); | |
548 | if(result == -1) { | |
549 | PERROR("sigaddset"); | |
550 | goto end; | |
551 | } | |
552 | result = sigprocmask(SIG_BLOCK, &sigset, NULL); | |
553 | if(result == -1) { | |
554 | PERROR("sigprocmask"); | |
555 | goto end; | |
556 | } | |
557 | ||
d89b8191 | 558 | buf = connect_buffer(args->instance, args->pid, args->trace, |
72098143 | 559 | args->channel, args->channel_cpu); |
d159ac37 AH |
560 | if(buf == NULL) { |
561 | ERR("failed to connect to buffer"); | |
562 | goto end; | |
563 | } | |
564 | ||
565 | consumer_loop(args->instance, buf); | |
566 | ||
567 | destroy_buffer(args->instance->callbacks, buf); | |
568 | ||
569 | end: | |
570 | ||
571 | if(args->instance->callbacks->on_close_thread) | |
572 | args->instance->callbacks->on_close_thread(args->instance->callbacks); | |
573 | ||
72098143 | 574 | free((void *)args->channel); |
d159ac37 AH |
575 | free(args); |
576 | return NULL; | |
577 | } | |
578 | ||
72098143 | 579 | int start_consuming_buffer(struct libustd_instance *instance, pid_t pid, |
d89b8191 NC |
580 | const char *trace, const char *channel, |
581 | int channel_cpu) | |
d159ac37 AH |
582 | { |
583 | pthread_t thr; | |
584 | struct consumer_thread_args *args; | |
585 | int result; | |
586 | ||
72098143 NC |
587 | DBG("beginning of start_consuming_buffer: args: pid %d bufname %s_%d", pid, channel, |
588 | channel_cpu); | |
d159ac37 | 589 | |
7032c7d3 | 590 | args = (struct consumer_thread_args *) zmalloc(sizeof(struct consumer_thread_args)); |
72098143 NC |
591 | if (!args) { |
592 | return -ENOMEM; | |
593 | } | |
d159ac37 AH |
594 | |
595 | args->pid = pid; | |
d89b8191 | 596 | args->trace = strdup(trace); |
72098143 NC |
597 | args->channel = strdup(channel); |
598 | args->channel_cpu = channel_cpu; | |
d159ac37 | 599 | args->instance = instance; |
d89b8191 NC |
600 | DBG("beginning2 of start_consuming_buffer: args: pid %d trace %s" |
601 | " bufname %s_%d", args->pid, args->channel, args->channel_cpu); | |
d159ac37 AH |
602 | |
603 | result = pthread_create(&thr, NULL, consumer_thread, args); | |
604 | if(result == -1) { | |
605 | ERR("pthread_create failed"); | |
606 | return -1; | |
607 | } | |
608 | result = pthread_detach(thr); | |
609 | if(result == -1) { | |
610 | ERR("pthread_detach failed"); | |
611 | return -1; | |
612 | } | |
d89b8191 NC |
613 | DBG("end of start_consuming_buffer: args: pid %d trace %s " |
614 | "bufname %s_%d", args->pid, args->channel, args->channel_cpu); | |
d159ac37 AH |
615 | |
616 | return 0; | |
617 | } | |
72098143 NC |
618 | static void process_client_cmd(int sock, struct ustcomm_header *req_header, |
619 | char *recvbuf, struct libustd_instance *instance) | |
4723ca09 | 620 | { |
72098143 NC |
621 | int result; |
622 | struct ustcomm_header _res_header; | |
623 | struct ustcomm_header *res_header = &_res_header; | |
624 | struct ustcomm_buffer_info *buf_inf; | |
625 | ||
626 | DBG("Processing client command"); | |
627 | ||
628 | switch (req_header->command) { | |
629 | case CONSUME_BUFFER: | |
630 | ||
631 | buf_inf = (struct ustcomm_buffer_info *)recvbuf; | |
632 | result = ustcomm_unpack_buffer_info(buf_inf); | |
633 | if (result < 0) { | |
634 | ERR("Couldn't unpack buffer info"); | |
635 | return; | |
4723ca09 NC |
636 | } |
637 | ||
d89b8191 NC |
638 | DBG("Going to consume trace %s buffer %s_%d in process %d", |
639 | buf_inf->trace, buf_inf->channel, buf_inf->ch_cpu, | |
640 | buf_inf->pid); | |
72098143 | 641 | result = start_consuming_buffer(instance, buf_inf->pid, |
d89b8191 | 642 | buf_inf->trace, |
72098143 NC |
643 | buf_inf->channel, |
644 | buf_inf->ch_cpu); | |
4723ca09 NC |
645 | if (result < 0) { |
646 | ERR("error in add_buffer"); | |
72098143 | 647 | return; |
4723ca09 NC |
648 | } |
649 | ||
72098143 NC |
650 | res_header->result = 0; |
651 | break; | |
652 | case EXIT: | |
653 | res_header->result = 0; | |
4723ca09 | 654 | /* Only there to force poll to return */ |
72098143 NC |
655 | break; |
656 | default: | |
657 | res_header->result = -EINVAL; | |
658 | WARN("unknown command: %d", req_header->command); | |
659 | } | |
660 | ||
661 | if (ustcomm_send(sock, res_header, NULL) <= 0) { | |
662 | ERR("couldn't send command response"); | |
4723ca09 NC |
663 | } |
664 | } | |
665 | ||
666 | #define MAX_EVENTS 10 | |
d159ac37 AH |
667 | |
668 | int libustd_start_instance(struct libustd_instance *instance) | |
669 | { | |
72098143 NC |
670 | struct ustcomm_header recv_hdr; |
671 | char recv_buf[USTCOMM_BUFFER_SIZE]; | |
4723ca09 NC |
672 | struct ustcomm_sock *epoll_sock; |
673 | struct epoll_event events[MAX_EVENTS]; | |
674 | struct sockaddr addr; | |
675 | int result, epoll_fd, accept_fd, nfds, i, addr_size, timeout; | |
d159ac37 AH |
676 | |
677 | if(!instance->is_init) { | |
678 | ERR("libustd instance not initialized"); | |
679 | return 1; | |
680 | } | |
4723ca09 NC |
681 | epoll_fd = instance->epoll_fd; |
682 | ||
683 | timeout = -1; | |
d159ac37 AH |
684 | |
685 | /* app loop */ | |
686 | for(;;) { | |
4723ca09 NC |
687 | nfds = epoll_wait(epoll_fd, events, MAX_EVENTS, timeout); |
688 | if (nfds == -1 && errno == EINTR) { | |
d159ac37 | 689 | /* Caught signal */ |
4723ca09 NC |
690 | } else if (nfds == -1) { |
691 | PERROR("libustd_start_instance: epoll_wait failed"); | |
692 | continue; | |
d159ac37 | 693 | } |
d159ac37 | 694 | |
4723ca09 NC |
695 | for (i = 0; i < nfds; ++i) { |
696 | epoll_sock = (struct ustcomm_sock *)events[i].data.ptr; | |
697 | if (epoll_sock == instance->listen_sock) { | |
698 | addr_size = sizeof(struct sockaddr); | |
699 | accept_fd = accept(epoll_sock->fd, | |
700 | &addr, | |
701 | (socklen_t *)&addr_size); | |
702 | if (accept_fd == -1) { | |
703 | PERROR("libustd_start_instance: " | |
704 | "accept failed"); | |
705 | continue; | |
706 | } | |
707 | ustcomm_init_sock(accept_fd, epoll_fd, | |
708 | &instance->connections); | |
709 | } else { | |
72098143 NC |
710 | result = ustcomm_recv(epoll_sock->fd, &recv_hdr, |
711 | recv_buf); | |
712 | if (result < 1) { | |
4723ca09 | 713 | ustcomm_del_sock(epoll_sock, 0); |
72098143 NC |
714 | } else { |
715 | process_client_cmd(epoll_sock->fd, | |
716 | &recv_hdr, recv_buf, | |
717 | instance); | |
d159ac37 AH |
718 | } |
719 | ||
d159ac37 | 720 | } |
d159ac37 AH |
721 | } |
722 | ||
4723ca09 | 723 | if (instance->quit_program) { |
d159ac37 AH |
724 | pthread_mutex_lock(&instance->mutex); |
725 | if(instance->active_buffers == 0) { | |
726 | pthread_mutex_unlock(&instance->mutex); | |
727 | break; | |
728 | } | |
729 | pthread_mutex_unlock(&instance->mutex); | |
730 | timeout = 100; | |
731 | } | |
732 | } | |
733 | ||
734 | if(instance->callbacks->on_trace_end) | |
735 | instance->callbacks->on_trace_end(instance); | |
736 | ||
737 | libustd_delete_instance(instance); | |
738 | ||
739 | return 0; | |
740 | } | |
741 | ||
4723ca09 | 742 | /* FIXME: threads and connections !? */ |
d159ac37 AH |
743 | void libustd_delete_instance(struct libustd_instance *instance) |
744 | { | |
4723ca09 NC |
745 | if (instance->is_init) { |
746 | ustcomm_del_named_sock(instance->listen_sock, 0); | |
747 | close(instance->epoll_fd); | |
748 | } | |
d159ac37 AH |
749 | |
750 | pthread_mutex_destroy(&instance->mutex); | |
751 | free(instance->sock_path); | |
752 | free(instance); | |
753 | } | |
754 | ||
72098143 NC |
755 | /* FIXME: Do something about the fixed path length, maybe get rid |
756 | * of the whole concept and use a pipe? | |
757 | */ | |
d159ac37 AH |
758 | int libustd_stop_instance(struct libustd_instance *instance, int send_msg) |
759 | { | |
760 | int result; | |
761 | int fd; | |
762 | int bytes = 0; | |
763 | ||
764 | char msg[] = "exit"; | |
765 | ||
766 | instance->quit_program = 1; | |
767 | ||
768 | if(!send_msg) | |
769 | return 0; | |
770 | ||
771 | /* Send a message through the socket to force poll to return */ | |
772 | ||
773 | struct sockaddr_un addr; | |
774 | ||
775 | result = fd = socket(PF_UNIX, SOCK_STREAM, 0); | |
776 | if(result == -1) { | |
777 | PERROR("socket"); | |
778 | return 1; | |
779 | } | |
780 | ||
781 | addr.sun_family = AF_UNIX; | |
782 | ||
783 | strncpy(addr.sun_path, instance->sock_path, UNIX_PATH_MAX); | |
784 | addr.sun_path[UNIX_PATH_MAX-1] = '\0'; | |
785 | ||
786 | result = connect(fd, (struct sockaddr *)&addr, sizeof(addr)); | |
787 | if(result == -1) { | |
788 | PERROR("connect"); | |
789 | } | |
790 | ||
791 | while(bytes != sizeof(msg)) | |
792 | bytes += send(fd, msg, sizeof(msg), 0); | |
793 | ||
794 | close(fd); | |
795 | ||
796 | return 0; | |
797 | } | |
798 | ||
4723ca09 NC |
799 | struct libustd_instance |
800 | *libustd_new_instance(struct libustd_callbacks *callbacks, | |
801 | char *sock_path) | |
d159ac37 AH |
802 | { |
803 | struct libustd_instance *instance = | |
7032c7d3 | 804 | zmalloc(sizeof(struct libustd_instance)); |
4723ca09 | 805 | if(!instance) { |
f3f8cc91 AH |
806 | return NULL; |
807 | } | |
808 | ||
d159ac37 AH |
809 | instance->callbacks = callbacks; |
810 | instance->quit_program = 0; | |
811 | instance->is_init = 0; | |
812 | instance->active_buffers = 0; | |
813 | pthread_mutex_init(&instance->mutex, NULL); | |
814 | ||
4723ca09 | 815 | if (sock_path) { |
d159ac37 | 816 | instance->sock_path = strdup(sock_path); |
4723ca09 | 817 | } else { |
d159ac37 | 818 | instance->sock_path = NULL; |
4723ca09 | 819 | } |
d159ac37 AH |
820 | |
821 | return instance; | |
822 | } | |
823 | ||
4723ca09 NC |
824 | static int init_ustd_socket(struct libustd_instance *instance) |
825 | { | |
826 | char *name; | |
827 | ||
828 | if (instance->sock_path) { | |
829 | if (asprintf(&name, "%s", instance->sock_path) < 0) { | |
830 | ERR("ustcomm_init_ustd : asprintf failed (sock_path %s)", | |
831 | instance->sock_path); | |
832 | return -1; | |
833 | } | |
834 | } else { | |
835 | int result; | |
836 | ||
837 | /* Only check if socket dir exists if we are using the default directory */ | |
838 | result = ensure_dir_exists(SOCK_DIR); | |
839 | if (result == -1) { | |
840 | ERR("Unable to create socket directory %s", SOCK_DIR); | |
841 | return -1; | |
842 | } | |
843 | ||
844 | if (asprintf(&name, "%s/%s", SOCK_DIR, "ustd") < 0) { | |
845 | ERR("ustcomm_init_ustd : asprintf failed (%s/ustd)", | |
846 | SOCK_DIR); | |
847 | return -1; | |
848 | } | |
849 | } | |
850 | ||
851 | /* Set up epoll */ | |
852 | instance->epoll_fd = epoll_create(MAX_EVENTS); | |
853 | if (instance->epoll_fd == -1) { | |
854 | ERR("epoll_create failed, start instance bailing"); | |
855 | goto free_name; | |
856 | } | |
857 | ||
858 | /* Create the named socket */ | |
859 | instance->listen_sock = ustcomm_init_named_socket(name, | |
860 | instance->epoll_fd); | |
861 | if(!instance->listen_sock) { | |
862 | ERR("error initializing named socket at %s", name); | |
863 | goto close_epoll; | |
864 | } | |
865 | ||
0222e121 | 866 | CDS_INIT_LIST_HEAD(&instance->connections); |
4723ca09 NC |
867 | |
868 | free(name); | |
869 | ||
870 | return 0; | |
871 | ||
872 | close_epoll: | |
873 | close(instance->epoll_fd); | |
874 | free_name: | |
875 | free(name); | |
876 | ||
877 | return -1; | |
878 | } | |
879 | ||
d159ac37 AH |
880 | int libustd_init_instance(struct libustd_instance *instance) |
881 | { | |
882 | int result; | |
4723ca09 | 883 | result = init_ustd_socket(instance); |
d159ac37 AH |
884 | if(result == -1) { |
885 | ERR("failed to initialize socket"); | |
886 | return 1; | |
887 | } | |
888 | instance->is_init = 1; | |
889 | return 0; | |
890 | } | |
891 |