Commit | Line | Data |
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d4a1283e 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. | |
d4a1283e 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 <getopt.h> | |
23 | #include <grp.h> | |
24 | #include <limits.h> | |
25 | #include <pthread.h> | |
26 | #include <signal.h> | |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
30 | #include <sys/ipc.h> | |
31 | #include <sys/shm.h> | |
32 | #include <sys/socket.h> | |
33 | #include <sys/stat.h> | |
34 | #include <sys/types.h> | |
35 | #include <urcu/list.h> | |
36 | #include <poll.h> | |
37 | #include <unistd.h> | |
03424a9b | 38 | #include <sys/mman.h> |
5348b470 | 39 | #include <assert.h> |
d4a1283e | 40 | |
6533b585 DG |
41 | #include <lttng/lttng-kconsumerd.h> |
42 | ||
d4a1283e | 43 | #include "lttngerr.h" |
50ecdf72 | 44 | #include "kernelctl.h" |
6533b585 DG |
45 | #include "ltt-kconsumerd.h" |
46 | #include "lttng-sessiond-comm.h" | |
d4a1283e JD |
47 | |
48 | /* the two threads (receive fd and poll) */ | |
6533b585 | 49 | static pthread_t threads[2]; |
d4a1283e | 50 | |
13e44745 JD |
51 | /* to count the number of time the user pressed ctrl+c */ |
52 | static int sigintcount = 0; | |
53 | ||
d4a1283e JD |
54 | /* Argument variables */ |
55 | int opt_quiet; | |
56 | int opt_verbose; | |
57 | static int opt_daemon; | |
58 | static const char *progname; | |
6533b585 DG |
59 | static char command_sock_path[PATH_MAX]; /* Global command socket path */ |
60 | static char error_sock_path[PATH_MAX]; /* Global error path */ | |
d4a1283e | 61 | |
6533b585 DG |
62 | /* the liblttngkconsumerd context */ |
63 | static struct lttng_kconsumerd_local_data *ctx; | |
cb040cc1 | 64 | |
d4a1283e | 65 | /* |
6533b585 | 66 | * Signal handler for the daemon |
d4a1283e JD |
67 | */ |
68 | static void sighandler(int sig) | |
69 | { | |
13e44745 JD |
70 | if (sig == SIGINT && sigintcount++ == 0) { |
71 | DBG("ignoring first SIGINT"); | |
72 | return; | |
73 | } | |
74 | ||
6533b585 | 75 | lttng_kconsumerd_should_exit(ctx); |
d4a1283e JD |
76 | } |
77 | ||
78 | /* | |
6533b585 | 79 | * Setup signal handler for : |
d4a1283e JD |
80 | * SIGINT, SIGTERM, SIGPIPE |
81 | */ | |
82 | static int set_signal_handler(void) | |
83 | { | |
84 | int ret = 0; | |
85 | struct sigaction sa; | |
86 | sigset_t sigset; | |
87 | ||
88 | if ((ret = sigemptyset(&sigset)) < 0) { | |
89 | perror("sigemptyset"); | |
90 | return ret; | |
91 | } | |
92 | ||
93 | sa.sa_handler = sighandler; | |
94 | sa.sa_mask = sigset; | |
95 | sa.sa_flags = 0; | |
96 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
97 | perror("sigaction"); | |
98 | return ret; | |
99 | } | |
100 | ||
101 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { | |
102 | perror("sigaction"); | |
103 | return ret; | |
104 | } | |
105 | ||
106 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
107 | perror("sigaction"); | |
108 | return ret; | |
109 | } | |
110 | ||
111 | return ret; | |
112 | } | |
113 | ||
d4a1283e JD |
114 | /* |
115 | * usage function on stderr | |
116 | */ | |
117 | static void usage(void) | |
118 | { | |
119 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); | |
120 | fprintf(stderr, " -h, --help " | |
121 | "Display this usage.\n"); | |
122 | fprintf(stderr, " -c, --kconsumerd-cmd-sock PATH " | |
123 | "Specify path for the command socket\n"); | |
124 | fprintf(stderr, " -e, --kconsumerd-err-sock PATH " | |
125 | "Specify path for the error socket\n"); | |
126 | fprintf(stderr, " -d, --daemonize " | |
127 | "Start as a daemon.\n"); | |
128 | fprintf(stderr, " -q, --quiet " | |
129 | "No output at all.\n"); | |
130 | fprintf(stderr, " -v, --verbose " | |
131 | "Verbose mode. Activate DBG() macro.\n"); | |
132 | fprintf(stderr, " -V, --version " | |
133 | "Show version number.\n"); | |
134 | } | |
135 | ||
136 | /* | |
137 | * daemon argument parsing | |
138 | */ | |
139 | static void parse_args(int argc, char **argv) | |
140 | { | |
141 | int c; | |
142 | ||
143 | static struct option long_options[] = { | |
144 | { "kconsumerd-cmd-sock", 1, 0, 'c' }, | |
145 | { "kconsumerd-err-sock", 1, 0, 'e' }, | |
146 | { "daemonize", 0, 0, 'd' }, | |
147 | { "help", 0, 0, 'h' }, | |
148 | { "quiet", 0, 0, 'q' }, | |
149 | { "verbose", 0, 0, 'v' }, | |
150 | { "version", 0, 0, 'V' }, | |
151 | { NULL, 0, 0, 0 } | |
152 | }; | |
153 | ||
154 | while (1) { | |
155 | int option_index = 0; | |
156 | c = getopt_long(argc, argv, "dhqvV" "c:e:", long_options, &option_index); | |
157 | if (c == -1) { | |
158 | break; | |
159 | } | |
160 | ||
161 | switch (c) { | |
914a571b JD |
162 | case 0: |
163 | fprintf(stderr, "option %s", long_options[option_index].name); | |
164 | if (optarg) { | |
165 | fprintf(stderr, " with arg %s\n", optarg); | |
166 | } | |
167 | break; | |
168 | case 'c': | |
169 | snprintf(command_sock_path, PATH_MAX, "%s", optarg); | |
170 | break; | |
171 | case 'e': | |
172 | snprintf(error_sock_path, PATH_MAX, "%s", optarg); | |
173 | break; | |
174 | case 'd': | |
175 | opt_daemon = 1; | |
176 | break; | |
177 | case 'h': | |
178 | usage(); | |
179 | exit(EXIT_FAILURE); | |
180 | case 'q': | |
181 | opt_quiet = 1; | |
182 | break; | |
183 | case 'v': | |
184 | opt_verbose = 1; | |
185 | break; | |
186 | case 'V': | |
187 | fprintf(stdout, "%s\n", VERSION); | |
188 | exit(EXIT_SUCCESS); | |
189 | default: | |
190 | usage(); | |
191 | exit(EXIT_FAILURE); | |
d4a1283e JD |
192 | } |
193 | } | |
194 | } | |
195 | ||
cb040cc1 | 196 | /* |
6533b585 | 197 | * Consume data on a file descriptor and write it on a trace file. |
cb040cc1 | 198 | */ |
6533b585 | 199 | static int read_subbuffer(struct lttng_kconsumerd_fd *kconsumerd_fd) |
cb040cc1 JD |
200 | { |
201 | unsigned long len; | |
202 | int err; | |
203 | long ret = 0; | |
204 | int infd = kconsumerd_fd->consumerd_fd; | |
205 | ||
206 | DBG("In kconsumerd_read_subbuffer (infd : %d)", infd); | |
207 | /* Get the next subbuffer */ | |
208 | err = kernctl_get_next_subbuf(infd); | |
209 | if (err != 0) { | |
210 | ret = errno; | |
81ffcd20 MD |
211 | /* |
212 | * This is a debug message even for single-threaded consumer, | |
213 | * because poll() have more relaxed criterions than get subbuf, | |
214 | * so get_subbuf may fail for short race windows where poll() | |
215 | * would issue wakeups. | |
216 | */ | |
217 | DBG("Reserving sub buffer failed (everything is normal, " | |
cb040cc1 JD |
218 | "it is due to concurrency)"); |
219 | goto end; | |
220 | } | |
221 | ||
57194bf2 | 222 | switch (kconsumerd_fd->output) { |
cb040cc1 JD |
223 | case LTTNG_EVENT_SPLICE: |
224 | /* read the whole subbuffer */ | |
225 | err = kernctl_get_padded_subbuf_size(infd, &len); | |
226 | if (err != 0) { | |
227 | ret = errno; | |
228 | perror("Getting sub-buffer len failed."); | |
229 | goto end; | |
230 | } | |
231 | ||
232 | /* splice the subbuffer to the tracefile */ | |
6533b585 | 233 | ret = lttng_kconsumerd_on_read_subbuffer_splice(ctx, kconsumerd_fd, len); |
cb040cc1 JD |
234 | if (ret < 0) { |
235 | /* | |
236 | * display the error but continue processing to try | |
237 | * to release the subbuffer | |
238 | */ | |
239 | ERR("Error splicing to tracefile"); | |
240 | } | |
241 | break; | |
242 | case LTTNG_EVENT_MMAP: | |
243 | /* read the used subbuffer size */ | |
8b270bdb | 244 | err = kernctl_get_padded_subbuf_size(infd, &len); |
cb040cc1 JD |
245 | if (err != 0) { |
246 | ret = errno; | |
247 | perror("Getting sub-buffer len failed."); | |
248 | goto end; | |
249 | } | |
250 | /* write the subbuffer to the tracefile */ | |
6533b585 | 251 | ret = lttng_kconsumerd_on_read_subbuffer_mmap(ctx, kconsumerd_fd, len); |
cb040cc1 JD |
252 | if (ret < 0) { |
253 | /* | |
254 | * display the error but continue processing to try | |
255 | * to release the subbuffer | |
256 | */ | |
257 | ERR("Error writing to tracefile"); | |
258 | } | |
259 | break; | |
260 | default: | |
261 | ERR("Unknown output method"); | |
262 | ret = -1; | |
263 | } | |
264 | ||
265 | err = kernctl_put_next_subbuf(infd); | |
266 | if (err != 0) { | |
267 | ret = errno; | |
268 | if (errno == EFAULT) { | |
269 | perror("Error in unreserving sub buffer\n"); | |
270 | } else if (errno == EIO) { | |
271 | /* Should never happen with newer LTTng versions */ | |
272 | perror("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
273 | } | |
274 | goto end; | |
275 | } | |
276 | ||
277 | end: | |
278 | return ret; | |
279 | } | |
d4a1283e | 280 | |
5348b470 JD |
281 | static int on_recv_fd(struct lttng_kconsumerd_fd *kconsumerd_fd) |
282 | { | |
283 | int ret; | |
284 | ||
285 | /* Opening the tracefile in write mode */ | |
286 | if (kconsumerd_fd->path_name != NULL) { | |
287 | ret = open(kconsumerd_fd->path_name, | |
288 | O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG|S_IRWXO); | |
289 | if (ret < 0) { | |
290 | ERR("Opening %s", kconsumerd_fd->path_name); | |
291 | perror("open"); | |
292 | goto error; | |
293 | } | |
294 | kconsumerd_fd->out_fd = ret; | |
295 | } | |
296 | ||
297 | if (kconsumerd_fd->output == LTTNG_EVENT_MMAP) { | |
298 | /* get the len of the mmap region */ | |
299 | ret = kernctl_get_mmap_len(kconsumerd_fd->consumerd_fd, &kconsumerd_fd->mmap_len); | |
300 | if (ret != 0) { | |
301 | ret = errno; | |
302 | perror("kernctl_get_mmap_len"); | |
303 | goto error_close_fd; | |
304 | } | |
305 | ||
306 | kconsumerd_fd->mmap_base = mmap(NULL, kconsumerd_fd->mmap_len, | |
307 | PROT_READ, MAP_PRIVATE, kconsumerd_fd->consumerd_fd, 0); | |
308 | if (kconsumerd_fd->mmap_base == MAP_FAILED) { | |
309 | perror("Error mmaping"); | |
310 | ret = -1; | |
311 | goto error_close_fd; | |
312 | } | |
313 | } | |
314 | ||
315 | /* we return 0 to let the library handle the FD internally */ | |
316 | return 0; | |
317 | ||
318 | error_close_fd: | |
319 | { | |
320 | int err; | |
321 | ||
322 | err = close(kconsumerd_fd->out_fd); | |
323 | assert(!err); | |
324 | } | |
325 | error: | |
326 | return ret; | |
327 | } | |
328 | ||
d4a1283e JD |
329 | /* |
330 | * main | |
331 | */ | |
332 | int main(int argc, char **argv) | |
333 | { | |
334 | int i; | |
335 | int ret = 0; | |
336 | void *status; | |
337 | ||
338 | /* Parse arguments */ | |
339 | progname = argv[0]; | |
340 | parse_args(argc, argv); | |
341 | ||
342 | /* Daemonize */ | |
343 | if (opt_daemon) { | |
344 | ret = daemon(0, 0); | |
345 | if (ret < 0) { | |
346 | perror("daemon"); | |
347 | goto error; | |
348 | } | |
349 | } | |
350 | ||
351 | if (strlen(command_sock_path) == 0) { | |
352 | snprintf(command_sock_path, PATH_MAX, | |
353 | KCONSUMERD_CMD_SOCK_PATH); | |
354 | } | |
5348b470 JD |
355 | /* create the consumer instance with and assign the callbacks */ |
356 | ctx = lttng_kconsumerd_create(read_subbuffer, on_recv_fd, NULL); | |
cb040cc1 JD |
357 | if (ctx == NULL) { |
358 | goto error; | |
359 | } | |
360 | ||
6533b585 | 361 | lttng_kconsumerd_set_command_sock_path(ctx, command_sock_path); |
d4a1283e JD |
362 | if (strlen(error_sock_path) == 0) { |
363 | snprintf(error_sock_path, PATH_MAX, | |
364 | KCONSUMERD_ERR_SOCK_PATH); | |
365 | } | |
366 | ||
367 | if (set_signal_handler() < 0) { | |
368 | goto error; | |
369 | } | |
370 | ||
371 | /* Connect to the socket created by ltt-sessiond to report errors */ | |
372 | DBG("Connecting to error socket %s", error_sock_path); | |
1ce86c9a | 373 | ret = lttcomm_connect_unix_sock(error_sock_path); |
d4a1283e | 374 | /* not a fatal error, but all communication with ltt-sessiond will fail */ |
1ce86c9a | 375 | if (ret < 0) { |
d4a1283e JD |
376 | WARN("Cannot connect to error socket, is ltt-sessiond started ?"); |
377 | } | |
6533b585 | 378 | lttng_kconsumerd_set_error_sock(ctx, ret); |
d4a1283e JD |
379 | |
380 | /* Create the thread to manage the receive of fd */ | |
6533b585 | 381 | ret = pthread_create(&threads[0], NULL, lttng_kconsumerd_thread_receive_fds, |
cb040cc1 | 382 | (void *) ctx); |
d4a1283e JD |
383 | if (ret != 0) { |
384 | perror("pthread_create"); | |
385 | goto error; | |
386 | } | |
387 | ||
388 | /* Create thread to manage the polling/writing of traces */ | |
6533b585 | 389 | ret = pthread_create(&threads[1], NULL, lttng_kconsumerd_thread_poll_fds, |
cb040cc1 | 390 | (void *) ctx); |
d4a1283e JD |
391 | if (ret != 0) { |
392 | perror("pthread_create"); | |
393 | goto error; | |
394 | } | |
395 | ||
396 | for (i = 0; i < 2; i++) { | |
397 | ret = pthread_join(threads[i], &status); | |
398 | if (ret != 0) { | |
399 | perror("pthread_join"); | |
400 | goto error; | |
401 | } | |
402 | } | |
403 | ret = EXIT_SUCCESS; | |
6533b585 | 404 | lttng_kconsumerd_send_error(ctx, KCONSUMERD_EXIT_SUCCESS); |
d4a1283e JD |
405 | goto end; |
406 | ||
407 | error: | |
408 | ret = EXIT_FAILURE; | |
6533b585 | 409 | lttng_kconsumerd_send_error(ctx, KCONSUMERD_EXIT_FAILURE); |
d4a1283e JD |
410 | |
411 | end: | |
6533b585 DG |
412 | lttng_kconsumerd_destroy(ctx); |
413 | lttng_kconsumerd_cleanup(); | |
d4a1283e JD |
414 | |
415 | return ret; | |
416 | } |