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f0966704 MD |
1 | /* |
2 | * ust-multi-test.c - single-proces, multi-session, multi-channel, multi-event UST tracing | |
3 | * | |
4 | * Copyright (C) 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
5 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the Free | |
9 | * Software Foundation; only version 2 of the License. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
14 | * more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along with | |
17 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
18 | * Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | */ | |
20 | ||
21 | #define _LARGEFILE64_SOURCE | |
9d335227 | 22 | #define _GNU_SOURCE |
f0966704 MD |
23 | #include <errno.h> |
24 | #include <stdio.h> | |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
27 | #include <signal.h> | |
28 | #include <unistd.h> | |
29 | #include <sys/wait.h> | |
30 | #include <sys/types.h> | |
31 | #include <sys/stat.h> | |
32 | #include <fcntl.h> | |
33 | #include <sys/mman.h> | |
34 | #include <limits.h> | |
35 | #include <urcu/futex.h> | |
36 | #include <urcu/uatomic.h> | |
37 | #include <assert.h> | |
38 | #include <sys/socket.h> | |
39 | ||
a3bb4b27 | 40 | #include <ust-comm.h> |
f0966704 MD |
41 | #include <../../libringbuffer/backend.h> |
42 | #include <../../libringbuffer/frontend.h> | |
43 | ||
44 | #define NR_SESSIONS 4 | |
45 | #define NR_CHANNELS 1 | |
46 | #define MAX_NR_STREAMS 64 | |
47 | #define NR_EVENTS 3 | |
48 | ||
49 | const char *evname[] = { | |
50 | "ust_tests_hello_tptest", | |
51 | "ust_tests_hello_tptest_sighandler", | |
52 | "ust_tests_hello_dontexist", | |
53 | }; | |
54 | ||
f0966704 | 55 | static int session_handle[NR_SESSIONS]; |
61f02aea MD |
56 | static struct lttng_ust_object_data metadata_stream_data[NR_SESSIONS]; |
57 | static struct lttng_ust_object_data metadata_data[NR_SESSIONS]; | |
58 | static struct lttng_ust_object_data channel_data[NR_SESSIONS][NR_CHANNELS]; | |
59 | static struct lttng_ust_object_data stream_data[NR_SESSIONS][NR_CHANNELS][MAX_NR_STREAMS]; | |
f0966704 MD |
60 | static int event_handle[NR_SESSIONS][NR_CHANNELS][NR_EVENTS]; |
61 | ||
62 | static int apps_socket = -1; | |
63 | static char apps_sock_path[PATH_MAX]; | |
64 | static char local_apps_wait_shm_path[PATH_MAX]; | |
65 | ||
66 | static volatile int quit_program; | |
67 | ||
68 | static void handle_signals(int signo) | |
69 | { | |
70 | quit_program = 1; | |
71 | } | |
72 | ||
f0966704 | 73 | static |
61f02aea | 74 | int open_streams(int sock, int channel_handle, struct lttng_ust_object_data *stream_datas, |
f0966704 MD |
75 | int nr_check) |
76 | { | |
77 | int ret, k = 0; | |
78 | ||
79 | for (;;) { | |
57773204 MD |
80 | struct ustcomm_ust_msg lum; |
81 | struct ustcomm_ust_reply lur; | |
f0966704 MD |
82 | |
83 | memset(&lum, 0, sizeof(lum)); | |
84 | lum.handle = channel_handle; | |
85 | lum.cmd = LTTNG_UST_STREAM; | |
57773204 | 86 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
87 | if (!ret) { |
88 | assert(k < nr_check); | |
89 | stream_datas[k].handle = lur.ret_val; | |
90 | printf("received stream handle %u\n", | |
91 | stream_datas[k].handle); | |
57773204 | 92 | if (lur.ret_code == USTCOMM_OK) { |
f0966704 MD |
93 | ssize_t len; |
94 | ||
95 | stream_datas[k].memory_map_size = lur.u.stream.memory_map_size; | |
96 | /* get shm fd */ | |
57773204 | 97 | len = ustcomm_recv_fd(sock); |
f0966704 MD |
98 | if (len < 0) |
99 | return -EINVAL; | |
100 | stream_datas[k].shm_fd = len; | |
101 | /* get wait fd */ | |
57773204 | 102 | len = ustcomm_recv_fd(sock); |
f0966704 MD |
103 | if (len < 0) |
104 | return -EINVAL; | |
105 | stream_datas[k].wait_fd = len; | |
106 | } | |
107 | k++; | |
108 | } | |
109 | if (ret == -ENOENT) | |
110 | break; | |
111 | if (ret) | |
112 | return ret; | |
113 | } | |
114 | return 0; | |
115 | } | |
116 | ||
117 | static | |
61f02aea | 118 | int close_streams(int sock, struct lttng_ust_object_data *stream_datas, int nr_check) |
f0966704 MD |
119 | { |
120 | int ret, k; | |
121 | ||
122 | for (k = 0; k < nr_check; k++) { | |
57773204 MD |
123 | struct ustcomm_ust_msg lum; |
124 | struct ustcomm_ust_reply lur; | |
f0966704 MD |
125 | |
126 | if (!stream_datas[k].handle) | |
127 | continue; | |
128 | memset(&lum, 0, sizeof(lum)); | |
129 | lum.handle = stream_datas[k].handle; | |
130 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 131 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
132 | if (ret) { |
133 | printf("Error closing stream\n"); | |
134 | return ret; | |
135 | } | |
136 | if (stream_datas[k].shm_fd >= 0) { | |
137 | ret = close(stream_datas[k].shm_fd); | |
138 | if (ret) { | |
139 | printf("Error closing stream shm_fd\n"); | |
140 | return ret; | |
141 | } | |
142 | } | |
143 | if (stream_datas[k].wait_fd >= 0) { | |
144 | ret = close(stream_datas[k].wait_fd); | |
145 | if (ret) { | |
146 | printf("Error closing stream wait_fd\n"); | |
147 | return ret; | |
148 | } | |
149 | } | |
150 | } | |
151 | return 0; | |
152 | } | |
153 | ||
154 | static | |
38fae1d3 | 155 | struct lttng_ust_shm_handle *map_channel(struct lttng_ust_object_data *chan_data, |
61f02aea | 156 | struct lttng_ust_object_data *stream_datas, int nr_check) |
f0966704 | 157 | { |
38fae1d3 | 158 | struct lttng_ust_shm_handle *handle; |
f0966704 MD |
159 | struct channel *chan; |
160 | int k, ret; | |
161 | ||
162 | /* map metadata channel */ | |
163 | handle = channel_handle_create(chan_data->shm_fd, | |
164 | chan_data->wait_fd, | |
165 | chan_data->memory_map_size); | |
166 | if (!handle) { | |
167 | printf("create handle error\n"); | |
168 | return NULL; | |
169 | } | |
170 | chan_data->shm_fd = -1; | |
171 | chan_data->wait_fd = -1; | |
172 | chan = shmp(handle, handle->chan); | |
173 | ||
174 | for (k = 0; k < nr_check; k++) { | |
61f02aea | 175 | struct lttng_ust_object_data *stream_data = &stream_datas[k]; |
f0966704 MD |
176 | |
177 | if (!stream_data->handle) | |
178 | break; | |
179 | /* map stream */ | |
180 | ret = channel_handle_add_stream(handle, | |
181 | stream_data->shm_fd, | |
182 | stream_data->wait_fd, | |
183 | stream_data->memory_map_size); | |
184 | if (ret) { | |
185 | printf("add stream error\n"); | |
186 | goto error_destroy; | |
187 | } | |
188 | stream_data->shm_fd = -1; | |
189 | stream_data->wait_fd = -1; | |
190 | } | |
191 | return handle; | |
192 | ||
193 | error_destroy: | |
194 | channel_destroy(chan, handle, 1); | |
195 | return NULL; | |
196 | } | |
197 | ||
198 | static | |
38fae1d3 | 199 | void unmap_channel(struct lttng_ust_shm_handle *handle) |
f0966704 MD |
200 | { |
201 | struct channel *chan; | |
202 | ||
203 | chan = shmp(handle, handle->chan); | |
204 | /* unmap channel */ | |
205 | channel_destroy(chan, handle, 1); | |
206 | } | |
207 | ||
208 | static | |
38fae1d3 | 209 | int consume_stream(struct lttng_ust_shm_handle *handle, int cpu, char *outfile) |
f0966704 MD |
210 | { |
211 | struct channel *chan; | |
4cfec15c | 212 | struct lttng_ust_lib_ring_buffer *buf; |
f0966704 | 213 | int outfd, ret; |
ef9ff354 MD |
214 | int *shm_fd, *wait_fd; |
215 | uint64_t *memory_map_size; | |
f0966704 MD |
216 | |
217 | chan = shmp(handle, handle->chan); | |
218 | ||
219 | /* open stream */ | |
220 | buf = channel_get_ring_buffer(&chan->backend.config, | |
221 | chan, cpu, handle, &shm_fd, &wait_fd, &memory_map_size); | |
222 | if (!buf) | |
223 | return -ENOENT; | |
224 | ret = lib_ring_buffer_open_read(buf, handle, 1); | |
225 | if (ret) { | |
226 | return -1; | |
227 | } | |
228 | ||
229 | /* copy */ | |
230 | outfd = open(outfile, O_WRONLY | O_CREAT | O_LARGEFILE | O_TRUNC, | |
231 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
232 | if (outfd < 0) { | |
233 | perror("open output"); | |
234 | return -1; | |
235 | } | |
236 | ||
237 | printf("Waiting for buffer data for %s\n", outfile); | |
238 | for (;;) { | |
239 | unsigned long read_size; | |
240 | unsigned long copy_size; | |
241 | char *ptr; | |
242 | ||
243 | ret = lib_ring_buffer_get_next_subbuf(buf, handle); | |
244 | printf("get next ret %d\n", ret); | |
245 | if (ret == -ENODATA) | |
246 | break; | |
247 | if (ret == -EAGAIN) { | |
248 | sleep(1); | |
249 | continue; | |
250 | } | |
251 | if (ret) { | |
252 | printf("Error %d in lib_ring_buffer_get_next_subbuf\n", ret); | |
253 | return -1; | |
254 | } | |
255 | read_size = lib_ring_buffer_get_read_data_size( | |
256 | &chan->backend.config, buf, handle); | |
257 | read_size = PAGE_ALIGN(read_size); | |
258 | ptr = lib_ring_buffer_read_offset_address( | |
259 | &buf->backend, 0, handle); | |
260 | printf("WRITE: copy %lu bytes\n", read_size); | |
261 | copy_size = write(outfd, ptr, read_size); | |
262 | if (copy_size < read_size) { | |
361dedfb | 263 | printf("write issue: copied %lu, expected %lu\n", copy_size, read_size); |
f0966704 MD |
264 | } |
265 | lib_ring_buffer_put_next_subbuf(buf, handle); | |
266 | } | |
267 | ||
268 | ret = close(outfd); | |
269 | if (ret) { | |
270 | perror("close"); | |
271 | return -1; | |
272 | } | |
273 | ||
274 | /* close stream */ | |
275 | lib_ring_buffer_release_read(buf, handle, 1); | |
276 | return 0; | |
277 | } | |
278 | ||
279 | static | |
280 | int consume_buffers(void) | |
281 | { | |
282 | int i, j, k, ret; | |
283 | mode_t old_umask; | |
284 | ||
285 | for (i = 0; i < NR_SESSIONS; i++) { | |
286 | char pathname[PATH_MAX]; | |
38fae1d3 | 287 | struct lttng_ust_shm_handle *handle; |
f0966704 MD |
288 | |
289 | snprintf(pathname, PATH_MAX - 1, "/tmp/testtrace%u", i); | |
290 | old_umask = umask(0); | |
291 | ret = mkdir(pathname, S_IRWXU | S_IRWXG); | |
292 | if (ret && errno != EEXIST) { | |
293 | perror("mkdir"); | |
294 | umask(old_umask); | |
295 | return -1; | |
296 | } | |
297 | umask(old_umask); | |
298 | ||
299 | /* copy metadata */ | |
300 | handle = map_channel(&metadata_data[i], | |
301 | &metadata_stream_data[i], 1); | |
302 | if (!handle) | |
303 | return -1; | |
304 | snprintf(pathname, PATH_MAX - 1, | |
305 | "/tmp/testtrace%u/metadata", i); | |
306 | ret = consume_stream(handle, -1, pathname); | |
307 | if (ret && ret != -ENOENT) { | |
308 | printf("Error in consume_stream\n"); | |
309 | return ret; | |
310 | } | |
311 | unmap_channel(handle); | |
312 | ||
313 | /* copy binary data */ | |
314 | for (j = 0; j < NR_CHANNELS; j++) { | |
315 | handle = map_channel(&channel_data[i][j], | |
316 | stream_data[i][j], MAX_NR_STREAMS); | |
317 | if (!handle) | |
318 | return -1; | |
319 | for (k = 0; k < MAX_NR_STREAMS; k++) { | |
320 | snprintf(pathname, PATH_MAX - 1, | |
321 | "/tmp/testtrace%u/data_%u", i, k); | |
322 | ret = consume_stream(handle, k, pathname); | |
323 | if (ret && ret != -ENOENT) { | |
324 | printf("Error in consume_stream\n"); | |
325 | return ret; | |
326 | } | |
327 | } | |
328 | unmap_channel(handle); | |
329 | } | |
330 | } | |
331 | ||
332 | return 0; | |
333 | } | |
334 | ||
335 | int send_app_msgs(int sock) | |
336 | { | |
57773204 MD |
337 | struct ustcomm_ust_msg lum; |
338 | struct ustcomm_ust_reply lur; | |
f0966704 MD |
339 | int ret, i, j, k; |
340 | ||
341 | for (i = 0; i < NR_SESSIONS; i++) { | |
342 | /* Create session */ | |
343 | memset(&lum, 0, sizeof(lum)); | |
344 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
345 | lum.cmd = LTTNG_UST_SESSION; | |
57773204 | 346 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
347 | if (ret) |
348 | return ret; | |
349 | session_handle[i] = lur.ret_val; | |
350 | printf("received session handle %u\n", session_handle[i]); | |
351 | ||
352 | /* Create metadata channel */ | |
353 | memset(&lum, 0, sizeof(lum)); | |
354 | lum.handle = session_handle[i]; | |
355 | lum.cmd = LTTNG_UST_METADATA; | |
356 | lum.u.channel.overwrite = 0; | |
357 | lum.u.channel.subbuf_size = 32768; | |
358 | lum.u.channel.num_subbuf = 4; | |
359 | lum.u.channel.switch_timer_interval = 0; | |
360 | lum.u.channel.read_timer_interval = 0; | |
361 | lum.u.channel.output = LTTNG_UST_MMAP; | |
57773204 | 362 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
363 | if (ret) |
364 | return ret; | |
365 | metadata_data[i].handle = lur.ret_val; | |
366 | printf("received metadata handle %u\n", metadata_data[i].handle); | |
57773204 | 367 | if (lur.ret_code == USTCOMM_OK) { |
f0966704 MD |
368 | ssize_t len; |
369 | ||
370 | metadata_data[i].memory_map_size = lur.u.channel.memory_map_size; | |
371 | /* get shm fd */ | |
57773204 | 372 | len = ustcomm_recv_fd(sock); |
f0966704 MD |
373 | if (len < 0) |
374 | return -EINVAL; | |
375 | metadata_data[i].shm_fd = len; | |
376 | /* get wait fd */ | |
57773204 | 377 | len = ustcomm_recv_fd(sock); |
f0966704 MD |
378 | if (len < 0) |
379 | return -EINVAL; | |
380 | metadata_data[i].wait_fd = len; | |
381 | } | |
382 | ||
383 | ret = open_streams(sock, metadata_data[i].handle, | |
384 | &metadata_stream_data[i], 1); | |
385 | if (ret) { | |
386 | printf("Error in open_streams\n"); | |
387 | return ret; | |
388 | } | |
389 | ||
390 | /* Create channels */ | |
391 | for (j = 0; j < NR_CHANNELS; j++) { | |
392 | memset(&lum, 0, sizeof(lum)); | |
393 | lum.handle = session_handle[i]; | |
394 | lum.cmd = LTTNG_UST_CHANNEL; | |
395 | //lum.u.channel.overwrite = 0; | |
396 | lum.u.channel.overwrite = 1; | |
397 | lum.u.channel.subbuf_size = 32768; | |
398 | lum.u.channel.num_subbuf = 8; | |
399 | //lum.u.channel.num_subbuf = 4; | |
400 | //lum.u.channel.num_subbuf = 2; | |
401 | lum.u.channel.switch_timer_interval = 0; | |
402 | lum.u.channel.read_timer_interval = 0; | |
403 | lum.u.channel.output = LTTNG_UST_MMAP; | |
57773204 | 404 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
405 | if (ret) |
406 | return ret; | |
407 | channel_data[i][j].handle = lur.ret_val; | |
408 | printf("received channel handle %u\n", channel_data[i][j].handle); | |
57773204 | 409 | if (lur.ret_code == USTCOMM_OK) { |
f0966704 MD |
410 | ssize_t len; |
411 | ||
412 | channel_data[i][j].memory_map_size = lur.u.channel.memory_map_size; | |
413 | /* get shm fd */ | |
57773204 | 414 | len = ustcomm_recv_fd(sock); |
f0966704 MD |
415 | if (len < 0) |
416 | return -EINVAL; | |
417 | channel_data[i][j].shm_fd = len; | |
418 | /* get wait fd */ | |
57773204 | 419 | len = ustcomm_recv_fd(sock); |
f0966704 MD |
420 | if (len < 0) |
421 | return -EINVAL; | |
422 | channel_data[i][j].wait_fd = len; | |
423 | } | |
424 | ||
425 | /* Create events */ | |
426 | for (k = 0; k < NR_EVENTS; k++) { | |
427 | memset(&lum, 0, sizeof(lum)); | |
428 | lum.handle = channel_data[i][j].handle; | |
429 | lum.cmd = LTTNG_UST_EVENT; | |
430 | strncpy(lum.u.event.name, evname[k], | |
431 | LTTNG_UST_SYM_NAME_LEN); | |
432 | lum.u.event.instrumentation = LTTNG_UST_TRACEPOINT; | |
57773204 | 433 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
434 | if (ret) |
435 | return ret; | |
436 | event_handle[i][j][k] = lur.ret_val; | |
437 | printf("received event handle %u\n", event_handle[i][j][k]); | |
438 | } | |
439 | ||
440 | /* Get references to channel streams */ | |
441 | ret = open_streams(sock, channel_data[i][j].handle, | |
442 | stream_data[i][j], MAX_NR_STREAMS); | |
443 | if (ret) { | |
444 | printf("Error in open_streams\n"); | |
445 | return ret; | |
446 | } | |
447 | } | |
448 | ||
449 | memset(&lum, 0, sizeof(lum)); | |
450 | lum.handle = session_handle[i]; | |
451 | lum.cmd = LTTNG_UST_SESSION_START; | |
57773204 | 452 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
453 | if (ret) |
454 | return ret; | |
455 | printf("Session handle %u started.\n", session_handle[i]); | |
456 | } | |
457 | ||
458 | /* Tell application registration is done */ | |
459 | memset(&lum, 0, sizeof(lum)); | |
460 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
461 | lum.cmd = LTTNG_UST_REGISTER_DONE; | |
57773204 | 462 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
463 | if (ret) |
464 | return ret; | |
465 | printf("Registration done acknowledged.\n"); | |
466 | ||
467 | sleep(4); | |
468 | ||
469 | ret = consume_buffers(); | |
470 | if (ret) { | |
471 | printf("Error in consume_buffers\n"); | |
472 | return ret; | |
473 | } | |
474 | ||
475 | for (i = 0; i < NR_SESSIONS; i++) { | |
476 | /* Release channels */ | |
477 | for (j = 0; j < NR_CHANNELS; j++) { | |
478 | /* Release streams */ | |
479 | ret = close_streams(sock, stream_data[i][j], | |
480 | MAX_NR_STREAMS); | |
481 | if (ret) | |
482 | return ret; | |
483 | ||
484 | /* Release events */ | |
485 | for (k = 0; k < NR_EVENTS; k++) { | |
486 | memset(&lum, 0, sizeof(lum)); | |
487 | lum.handle = event_handle[i][j][k]; | |
488 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 489 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
490 | if (ret) |
491 | return ret; | |
492 | } | |
493 | memset(&lum, 0, sizeof(lum)); | |
494 | lum.handle = channel_data[i][j].handle; | |
495 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 496 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
497 | if (ret) |
498 | return ret; | |
499 | if (channel_data[i][j].shm_fd >= 0) { | |
500 | ret = close(channel_data[i][j].shm_fd); | |
501 | if (ret) | |
502 | return ret; | |
503 | } | |
504 | if (channel_data[i][j].wait_fd >= 0) { | |
505 | ret = close(channel_data[i][j].wait_fd); | |
506 | if (ret) | |
507 | return ret; | |
508 | } | |
509 | } | |
510 | ||
511 | /* Release metadata channel */ | |
512 | ret = close_streams(sock, &metadata_stream_data[i], 1); | |
513 | if (ret) | |
514 | return ret; | |
515 | ||
516 | memset(&lum, 0, sizeof(lum)); | |
517 | lum.handle = metadata_data[i].handle; | |
518 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 519 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
520 | if (ret) |
521 | return ret; | |
522 | if (metadata_data[i].shm_fd >= 0) { | |
523 | ret = close(metadata_data[i].shm_fd); | |
524 | if (ret) | |
525 | return ret; | |
526 | } | |
527 | if (metadata_data[i].wait_fd >= 0) { | |
528 | ret = close(metadata_data[i].wait_fd); | |
529 | if (ret) | |
530 | return ret; | |
531 | } | |
532 | ||
533 | /* Release session */ | |
534 | memset(&lum, 0, sizeof(lum)); | |
535 | lum.handle = session_handle[i]; | |
536 | lum.cmd = LTTNG_UST_RELEASE; | |
57773204 | 537 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
f0966704 MD |
538 | if (ret) |
539 | return ret; | |
540 | } | |
541 | ||
542 | return 0; | |
543 | } | |
544 | ||
545 | /* | |
546 | * Using fork to set umask in the child process (not multi-thread safe). We | |
547 | * deal with the shm_open vs ftruncate race (happening when the sessiond owns | |
548 | * the shm and does not let everybody modify it, to ensure safety against | |
549 | * shm_unlink) by simply letting the mmap fail and retrying after a few | |
550 | * seconds. For global shm, everybody has rw access to it until the sessiond | |
551 | * starts. | |
552 | */ | |
553 | static int get_wait_shm(char *shm_path, size_t mmap_size, int global) | |
554 | { | |
555 | int wait_shm_fd, ret; | |
556 | mode_t mode; | |
557 | ||
558 | /* Default permissions */ | |
559 | mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP; | |
560 | ||
561 | /* Change owner of the shm path */ | |
562 | if (global) { | |
563 | ret = chown(shm_path, 0, 0); | |
564 | if (ret < 0) { | |
565 | if (errno != ENOENT) { | |
566 | perror("chown wait shm"); | |
567 | goto error; | |
568 | } | |
569 | } | |
570 | ||
571 | /* | |
572 | * If global session daemon, any application can register so the shm | |
573 | * needs to be set in read-only mode for others. | |
574 | */ | |
575 | mode |= S_IROTH; | |
576 | } else { | |
577 | ret = chown(shm_path, getuid(), getgid()); | |
578 | if (ret < 0) { | |
579 | if (errno != ENOENT) { | |
580 | perror("chown wait shm"); | |
581 | goto error; | |
582 | } | |
583 | } | |
584 | } | |
585 | ||
586 | /* | |
587 | * Set permissions to the shm even if we did not create the shm. | |
588 | */ | |
589 | ret = chmod(shm_path, mode); | |
590 | if (ret < 0) { | |
591 | if (errno != ENOENT) { | |
592 | perror("chmod wait shm"); | |
593 | goto error; | |
594 | } | |
595 | } | |
596 | ||
597 | /* | |
598 | * We're alone in a child process, so we can modify the process-wide | |
599 | * umask. | |
600 | */ | |
601 | umask(~mode); | |
602 | ||
603 | /* | |
604 | * Try creating shm (or get rw access). We don't do an exclusive open, | |
605 | * because we allow other processes to create+ftruncate it concurrently. | |
606 | */ | |
607 | wait_shm_fd = shm_open(shm_path, O_RDWR | O_CREAT, mode); | |
608 | if (wait_shm_fd < 0) { | |
609 | perror("shm_open wait shm"); | |
610 | goto error; | |
611 | } | |
612 | ||
613 | ret = ftruncate(wait_shm_fd, mmap_size); | |
614 | if (ret < 0) { | |
615 | perror("ftruncate wait shm"); | |
616 | exit(EXIT_FAILURE); | |
617 | } | |
618 | ||
619 | ret = fchmod(wait_shm_fd, mode); | |
620 | if (ret < 0) { | |
621 | perror("fchmod"); | |
622 | exit(EXIT_FAILURE); | |
623 | } | |
624 | ||
625 | printf("Got the wait shm fd %d\n", wait_shm_fd); | |
626 | ||
627 | return wait_shm_fd; | |
628 | ||
629 | error: | |
630 | printf("Failing to get the wait shm fd\n"); | |
631 | ||
632 | return -1; | |
633 | } | |
634 | ||
635 | int update_futex(int fd, int active) | |
636 | { | |
637 | size_t mmap_size = sysconf(_SC_PAGE_SIZE); | |
638 | char *wait_shm_mmap; | |
639 | int ret; | |
640 | ||
641 | wait_shm_mmap = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, | |
642 | MAP_SHARED, fd, 0); | |
643 | if (wait_shm_mmap == MAP_FAILED) { | |
644 | perror("mmap"); | |
645 | goto error; | |
646 | } | |
647 | ||
648 | if (active) { | |
649 | uatomic_set((int32_t *) wait_shm_mmap, 1); | |
650 | futex_async((int32_t *) wait_shm_mmap, FUTEX_WAKE, | |
651 | INT_MAX, NULL, NULL, 0); | |
652 | } else { | |
653 | uatomic_set((int32_t *) wait_shm_mmap, 0); | |
654 | } | |
655 | ret = munmap(wait_shm_mmap, mmap_size); | |
656 | if (ret) { | |
657 | perror("Error unmapping wait shm"); | |
658 | goto error; | |
659 | } | |
660 | return 0; | |
661 | error: | |
662 | return -1; | |
663 | } | |
664 | ||
665 | /* | |
666 | * Set open files limit to unlimited. This daemon can open a large number of | |
667 | * file descriptors in order to consumer multiple kernel traces. | |
668 | */ | |
669 | static void set_ulimit(void) | |
670 | { | |
671 | int ret; | |
672 | struct rlimit lim; | |
673 | ||
674 | /* | |
675 | * If not root, we cannot increase our max open files. But our | |
676 | * scope is then limited to processes from a single user. | |
677 | */ | |
678 | if (getuid() != 0) | |
679 | return; | |
680 | /* The kernel does not allowed an infinite limit for open files */ | |
681 | lim.rlim_cur = 65535; | |
682 | lim.rlim_max = 65535; | |
683 | ||
684 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
685 | if (ret < 0) { | |
686 | perror("failed to set open files limit"); | |
687 | } | |
688 | } | |
689 | ||
690 | int main(int argc, char **argv) | |
691 | { | |
692 | const char *home_dir; | |
693 | int ret, wait_shm_fd; | |
694 | struct sigaction act; | |
fb50c39d | 695 | mode_t old_umask = 0; |
f0966704 MD |
696 | |
697 | set_ulimit(); | |
698 | ||
699 | /* Ignore sigpipe */ | |
700 | memset(&act, 0, sizeof(act)); | |
701 | ret = sigemptyset(&act.sa_mask); | |
702 | if (ret == -1) { | |
703 | perror("sigemptyset"); | |
704 | return -1; | |
705 | } | |
706 | ||
707 | act.sa_handler = SIG_IGN; | |
708 | ret = sigaction(SIGPIPE, &act, NULL); | |
709 | if (ret == -1) { | |
710 | perror("sigaction"); | |
711 | return -1; | |
712 | } | |
713 | ||
714 | /* Handle SIGTERM */ | |
715 | act.sa_handler = handle_signals; | |
716 | ret = sigaction(SIGTERM, &act, NULL); | |
717 | if (ret == -1) { | |
718 | perror("sigaction"); | |
719 | return -1; | |
720 | } | |
721 | /* Handle SIGINT */ | |
722 | ret = sigaction(SIGINT, &act, NULL); | |
723 | if (ret == -1) { | |
724 | perror("sigaction"); | |
725 | return -1; | |
726 | } | |
727 | ||
728 | if (geteuid() == 0) { | |
729 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH); | |
730 | if (ret && errno != EEXIST) { | |
731 | perror("mkdir"); | |
732 | return -1; | |
733 | } | |
734 | wait_shm_fd = get_wait_shm(DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH, | |
735 | sysconf(_SC_PAGE_SIZE), 1); | |
736 | if (wait_shm_fd < 0) { | |
737 | perror("global wait shm error"); | |
738 | return -1; | |
739 | } | |
740 | strcpy(apps_sock_path, DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
741 | old_umask = umask(0); | |
742 | } else { | |
743 | snprintf(local_apps_wait_shm_path, PATH_MAX, | |
744 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, getuid()); | |
745 | wait_shm_fd = get_wait_shm(local_apps_wait_shm_path, | |
746 | sysconf(_SC_PAGE_SIZE), 0); | |
747 | if (wait_shm_fd < 0) { | |
748 | perror("local wait shm error"); | |
749 | return -1; | |
750 | } | |
751 | home_dir = (const char *) getenv("HOME"); | |
752 | if (!home_dir) { | |
753 | perror("getenv error"); | |
754 | return -ENOENT; | |
755 | } | |
756 | snprintf(apps_sock_path, PATH_MAX, | |
757 | DEFAULT_HOME_APPS_UNIX_SOCK, home_dir); | |
758 | } | |
759 | ||
57773204 | 760 | ret = ustcomm_create_unix_sock(apps_sock_path); |
f0966704 MD |
761 | if (ret < 0) { |
762 | perror("create error"); | |
763 | return ret; | |
764 | } | |
765 | apps_socket = ret; | |
766 | ||
767 | if (getuid() == 0) { | |
768 | /* File permission MUST be 666 */ | |
769 | ret = chmod(apps_sock_path, | |
770 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
771 | if (ret < 0) { | |
772 | printf("Set file permissions failed: %s\n", apps_sock_path); | |
773 | perror("chmod"); | |
774 | goto end; | |
775 | } | |
776 | umask(old_umask); | |
777 | } | |
57773204 | 778 | ret = ustcomm_listen_unix_sock(apps_socket); |
f0966704 MD |
779 | if (ret < 0) { |
780 | perror("listen error"); | |
781 | return ret; | |
782 | } | |
783 | ||
784 | /* wake up futexes */ | |
785 | ret = update_futex(wait_shm_fd, 1); | |
786 | if (ret) { | |
787 | fprintf(stderr, "Error wakeup futex\n"); | |
788 | return -1; | |
789 | } | |
790 | ||
791 | for (;;) { | |
792 | int sock; | |
793 | ssize_t len; | |
794 | struct { | |
795 | uint32_t major; | |
796 | uint32_t minor; | |
797 | pid_t pid; | |
798 | pid_t ppid; | |
799 | uid_t uid; | |
800 | gid_t gid; | |
801 | char name[16]; /* Process name */ | |
802 | } reg_msg; | |
803 | char bufname[17]; | |
804 | ||
805 | if (quit_program) | |
806 | break; | |
807 | ||
808 | printf("Accepting application registration\n"); | |
57773204 | 809 | sock = ustcomm_accept_unix_sock(apps_socket); |
f0966704 MD |
810 | if (sock < 0) { |
811 | perror("accept error"); | |
812 | goto end; | |
813 | } | |
814 | ||
815 | /* | |
816 | * Basic recv here to handle the very simple data | |
817 | * that the libust send to register (reg_msg). | |
818 | */ | |
57773204 | 819 | len = ustcomm_recv_unix_sock(sock, ®_msg, sizeof(reg_msg)); |
f0966704 | 820 | if (len < 0 || len != sizeof(reg_msg)) { |
57773204 | 821 | perror("ustcomm_recv_unix_sock"); |
f0966704 MD |
822 | continue; |
823 | } | |
824 | memcpy(bufname, reg_msg.name, 16); | |
825 | bufname[16] = '\0'; | |
826 | printf("Application %s pid %u ppid %u uid %u gid %u has registered (version : %u.%u)\n", | |
827 | bufname, reg_msg.pid, reg_msg.ppid, reg_msg.uid, | |
828 | reg_msg.gid, reg_msg.major, reg_msg.minor); | |
829 | ret = send_app_msgs(sock); | |
830 | if (ret) { | |
831 | printf("Error in send_app_msgs.\n"); | |
832 | sleep(1); | |
833 | } | |
834 | close(sock); | |
835 | } | |
836 | ||
837 | end: | |
838 | printf("quitting.\n"); | |
839 | /* Let applications know we are not responding anymore */ | |
840 | ret = update_futex(wait_shm_fd, 0); | |
841 | if (ret) { | |
842 | fprintf(stderr, "Error wakeup futex\n"); | |
843 | return -1; | |
844 | } | |
845 | ||
846 | return 0; | |
847 | } |