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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> |
d4a1283e JD |
39 | |
40 | #include "lttngerr.h" | |
50ecdf72 MD |
41 | #include "kernelctl.h" |
42 | #include "lttkconsumerd.h" | |
d4a1283e JD |
43 | |
44 | /* the two threads (receive fd and poll) */ | |
1ce86c9a | 45 | pthread_t threads[2]; |
d4a1283e | 46 | |
13e44745 JD |
47 | /* to count the number of time the user pressed ctrl+c */ |
48 | static int sigintcount = 0; | |
49 | ||
d4a1283e JD |
50 | /* Argument variables */ |
51 | int opt_quiet; | |
52 | int opt_verbose; | |
53 | static int opt_daemon; | |
54 | static const char *progname; | |
1ce86c9a JD |
55 | char command_sock_path[PATH_MAX]; /* Global command socket path */ |
56 | char error_sock_path[PATH_MAX]; /* Global error path */ | |
d4a1283e | 57 | |
cb040cc1 JD |
58 | /* the liblttkconsumerd context */ |
59 | struct kconsumerd_local_data *ctx; | |
60 | ||
d4a1283e JD |
61 | /* |
62 | * sighandler | |
63 | * | |
64 | * Signal handler for the daemon | |
65 | */ | |
66 | static void sighandler(int sig) | |
67 | { | |
13e44745 JD |
68 | if (sig == SIGINT && sigintcount++ == 0) { |
69 | DBG("ignoring first SIGINT"); | |
70 | return; | |
71 | } | |
72 | ||
cb040cc1 | 73 | kconsumerd_should_exit(ctx); |
d4a1283e JD |
74 | } |
75 | ||
76 | /* | |
77 | * set_signal_handler | |
78 | * | |
79 | * Setup signal handler for : | |
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 JD |
196 | /* |
197 | * read_subbuffer | |
198 | * | |
199 | * Consume data on a file descriptor and write it on a trace file | |
200 | */ | |
201 | static int read_subbuffer(struct kconsumerd_fd *kconsumerd_fd) | |
202 | { | |
203 | unsigned long len; | |
204 | int err; | |
205 | long ret = 0; | |
206 | int infd = kconsumerd_fd->consumerd_fd; | |
207 | ||
208 | DBG("In kconsumerd_read_subbuffer (infd : %d)", infd); | |
209 | /* Get the next subbuffer */ | |
210 | err = kernctl_get_next_subbuf(infd); | |
211 | if (err != 0) { | |
212 | ret = errno; | |
213 | perror("Reserving sub buffer failed (everything is normal, " | |
214 | "it is due to concurrency)"); | |
215 | goto end; | |
216 | } | |
217 | ||
218 | switch (DEFAULT_KERNEL_CHANNEL_OUTPUT) { | |
219 | case LTTNG_EVENT_SPLICE: | |
220 | /* read the whole subbuffer */ | |
221 | err = kernctl_get_padded_subbuf_size(infd, &len); | |
222 | if (err != 0) { | |
223 | ret = errno; | |
224 | perror("Getting sub-buffer len failed."); | |
225 | goto end; | |
226 | } | |
227 | ||
228 | /* splice the subbuffer to the tracefile */ | |
229 | ret = kconsumerd_on_read_subbuffer_splice(ctx, kconsumerd_fd, len); | |
230 | if (ret < 0) { | |
231 | /* | |
232 | * display the error but continue processing to try | |
233 | * to release the subbuffer | |
234 | */ | |
235 | ERR("Error splicing to tracefile"); | |
236 | } | |
237 | break; | |
238 | case LTTNG_EVENT_MMAP: | |
239 | /* read the used subbuffer size */ | |
8b270bdb | 240 | err = kernctl_get_padded_subbuf_size(infd, &len); |
cb040cc1 JD |
241 | if (err != 0) { |
242 | ret = errno; | |
243 | perror("Getting sub-buffer len failed."); | |
244 | goto end; | |
245 | } | |
246 | /* write the subbuffer to the tracefile */ | |
247 | ret = kconsumerd_on_read_subbuffer_mmap(ctx, kconsumerd_fd, len); | |
248 | if (ret < 0) { | |
249 | /* | |
250 | * display the error but continue processing to try | |
251 | * to release the subbuffer | |
252 | */ | |
253 | ERR("Error writing to tracefile"); | |
254 | } | |
255 | break; | |
256 | default: | |
257 | ERR("Unknown output method"); | |
258 | ret = -1; | |
259 | } | |
260 | ||
261 | err = kernctl_put_next_subbuf(infd); | |
262 | if (err != 0) { | |
263 | ret = errno; | |
264 | if (errno == EFAULT) { | |
265 | perror("Error in unreserving sub buffer\n"); | |
266 | } else if (errno == EIO) { | |
267 | /* Should never happen with newer LTTng versions */ | |
268 | perror("Reader has been pushed by the writer, last sub-buffer corrupted."); | |
269 | } | |
270 | goto end; | |
271 | } | |
272 | ||
273 | end: | |
274 | return ret; | |
275 | } | |
d4a1283e JD |
276 | |
277 | /* | |
278 | * main | |
279 | */ | |
280 | int main(int argc, char **argv) | |
281 | { | |
282 | int i; | |
283 | int ret = 0; | |
284 | void *status; | |
285 | ||
286 | /* Parse arguments */ | |
287 | progname = argv[0]; | |
288 | parse_args(argc, argv); | |
289 | ||
290 | /* Daemonize */ | |
291 | if (opt_daemon) { | |
292 | ret = daemon(0, 0); | |
293 | if (ret < 0) { | |
294 | perror("daemon"); | |
295 | goto error; | |
296 | } | |
297 | } | |
298 | ||
299 | if (strlen(command_sock_path) == 0) { | |
300 | snprintf(command_sock_path, PATH_MAX, | |
301 | KCONSUMERD_CMD_SOCK_PATH); | |
302 | } | |
cb040cc1 JD |
303 | /* create the pipe to wake to receiving thread when needed */ |
304 | ctx = kconsumerd_create(read_subbuffer); | |
305 | if (ctx == NULL) { | |
306 | goto error; | |
307 | } | |
308 | ||
309 | kconsumerd_set_command_socket_path(ctx, command_sock_path); | |
d4a1283e JD |
310 | if (strlen(error_sock_path) == 0) { |
311 | snprintf(error_sock_path, PATH_MAX, | |
312 | KCONSUMERD_ERR_SOCK_PATH); | |
313 | } | |
314 | ||
315 | if (set_signal_handler() < 0) { | |
316 | goto error; | |
317 | } | |
318 | ||
319 | /* Connect to the socket created by ltt-sessiond to report errors */ | |
320 | DBG("Connecting to error socket %s", error_sock_path); | |
1ce86c9a | 321 | ret = lttcomm_connect_unix_sock(error_sock_path); |
d4a1283e | 322 | /* not a fatal error, but all communication with ltt-sessiond will fail */ |
1ce86c9a | 323 | if (ret < 0) { |
d4a1283e JD |
324 | WARN("Cannot connect to error socket, is ltt-sessiond started ?"); |
325 | } | |
cb040cc1 | 326 | kconsumerd_set_error_socket(ctx, ret); |
d4a1283e JD |
327 | |
328 | /* Create the thread to manage the receive of fd */ | |
1ce86c9a | 329 | ret = pthread_create(&threads[0], NULL, kconsumerd_thread_receive_fds, |
cb040cc1 | 330 | (void *) ctx); |
d4a1283e JD |
331 | if (ret != 0) { |
332 | perror("pthread_create"); | |
333 | goto error; | |
334 | } | |
335 | ||
336 | /* Create thread to manage the polling/writing of traces */ | |
1ce86c9a | 337 | ret = pthread_create(&threads[1], NULL, kconsumerd_thread_poll_fds, |
cb040cc1 | 338 | (void *) ctx); |
d4a1283e JD |
339 | if (ret != 0) { |
340 | perror("pthread_create"); | |
341 | goto error; | |
342 | } | |
343 | ||
344 | for (i = 0; i < 2; i++) { | |
345 | ret = pthread_join(threads[i], &status); | |
346 | if (ret != 0) { | |
347 | perror("pthread_join"); | |
348 | goto error; | |
349 | } | |
350 | } | |
351 | ret = EXIT_SUCCESS; | |
cb040cc1 | 352 | kconsumerd_send_error(ctx, KCONSUMERD_EXIT_SUCCESS); |
d4a1283e JD |
353 | goto end; |
354 | ||
355 | error: | |
356 | ret = EXIT_FAILURE; | |
cb040cc1 | 357 | kconsumerd_send_error(ctx, KCONSUMERD_EXIT_FAILURE); |
d4a1283e JD |
358 | |
359 | end: | |
cb040cc1 | 360 | kconsumerd_destroy(ctx); |
1ce86c9a | 361 | kconsumerd_cleanup(); |
d4a1283e JD |
362 | |
363 | return ret; | |
364 | } |