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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> |
3bd1e081 | 40 | #include <config.h> |
d4a1283e | 41 | |
3bd1e081 | 42 | #include <lttng-consumerd.h> |
1e307fab DG |
43 | #include <lttng-kernel-ctl.h> |
44 | #include <lttng-sessiond-comm.h> | |
3bd1e081 MD |
45 | #include <lttng/lttng-kconsumer.h> |
46 | #include <lttng/lttng-ustconsumer.h> | |
1e307fab | 47 | #include <lttngerr.h> |
d4a1283e | 48 | |
3bd1e081 MD |
49 | /* TODO : support UST (all direct kernctl accesses). */ |
50 | ||
d4a1283e | 51 | /* the two threads (receive fd and poll) */ |
6533b585 | 52 | static pthread_t threads[2]; |
d4a1283e | 53 | |
13e44745 JD |
54 | /* to count the number of time the user pressed ctrl+c */ |
55 | static int sigintcount = 0; | |
56 | ||
d4a1283e JD |
57 | /* Argument variables */ |
58 | int opt_quiet; | |
59 | int opt_verbose; | |
60 | static int opt_daemon; | |
61 | static const char *progname; | |
6533b585 DG |
62 | static char command_sock_path[PATH_MAX]; /* Global command socket path */ |
63 | static char error_sock_path[PATH_MAX]; /* Global error path */ | |
3bd1e081 | 64 | static enum lttng_consumer_type opt_type = LTTNG_CONSUMER_KERNEL; |
d4a1283e | 65 | |
6533b585 | 66 | /* the liblttngkconsumerd context */ |
3bd1e081 | 67 | static struct lttng_consumer_local_data *ctx; |
cb040cc1 | 68 | |
d4a1283e | 69 | /* |
6533b585 | 70 | * Signal handler for the daemon |
d4a1283e JD |
71 | */ |
72 | static void sighandler(int sig) | |
73 | { | |
13e44745 JD |
74 | if (sig == SIGINT && sigintcount++ == 0) { |
75 | DBG("ignoring first SIGINT"); | |
76 | return; | |
77 | } | |
78 | ||
3bd1e081 | 79 | lttng_consumer_should_exit(ctx); |
d4a1283e JD |
80 | } |
81 | ||
82 | /* | |
6533b585 | 83 | * Setup signal handler for : |
d4a1283e JD |
84 | * SIGINT, SIGTERM, SIGPIPE |
85 | */ | |
86 | static int set_signal_handler(void) | |
87 | { | |
88 | int ret = 0; | |
89 | struct sigaction sa; | |
90 | sigset_t sigset; | |
91 | ||
92 | if ((ret = sigemptyset(&sigset)) < 0) { | |
93 | perror("sigemptyset"); | |
94 | return ret; | |
95 | } | |
96 | ||
97 | sa.sa_handler = sighandler; | |
98 | sa.sa_mask = sigset; | |
99 | sa.sa_flags = 0; | |
100 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
101 | perror("sigaction"); | |
102 | return ret; | |
103 | } | |
104 | ||
105 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { | |
106 | perror("sigaction"); | |
107 | return ret; | |
108 | } | |
109 | ||
110 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
111 | perror("sigaction"); | |
112 | return ret; | |
113 | } | |
114 | ||
115 | return ret; | |
116 | } | |
117 | ||
d4a1283e JD |
118 | /* |
119 | * usage function on stderr | |
120 | */ | |
121 | static void usage(void) | |
122 | { | |
123 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); | |
124 | fprintf(stderr, " -h, --help " | |
125 | "Display this usage.\n"); | |
126 | fprintf(stderr, " -c, --kconsumerd-cmd-sock PATH " | |
127 | "Specify path for the command socket\n"); | |
128 | fprintf(stderr, " -e, --kconsumerd-err-sock PATH " | |
129 | "Specify path for the error socket\n"); | |
130 | fprintf(stderr, " -d, --daemonize " | |
131 | "Start as a daemon.\n"); | |
132 | fprintf(stderr, " -q, --quiet " | |
133 | "No output at all.\n"); | |
134 | fprintf(stderr, " -v, --verbose " | |
135 | "Verbose mode. Activate DBG() macro.\n"); | |
136 | fprintf(stderr, " -V, --version " | |
137 | "Show version number.\n"); | |
3bd1e081 MD |
138 | fprintf(stderr, " -k, --kernel " |
139 | "Consumer kernel buffers (default).\n"); | |
140 | fprintf(stderr, " -u, --ust " | |
141 | "Consumer UST buffers.%s\n", | |
74d0b642 | 142 | #ifdef HAVE_LIBLTTNG_UST_CTL |
3bd1e081 MD |
143 | "" |
144 | #else | |
145 | " (support not compiled in)" | |
146 | #endif | |
147 | ); | |
d4a1283e JD |
148 | } |
149 | ||
150 | /* | |
151 | * daemon argument parsing | |
152 | */ | |
153 | static void parse_args(int argc, char **argv) | |
154 | { | |
155 | int c; | |
156 | ||
157 | static struct option long_options[] = { | |
158 | { "kconsumerd-cmd-sock", 1, 0, 'c' }, | |
159 | { "kconsumerd-err-sock", 1, 0, 'e' }, | |
160 | { "daemonize", 0, 0, 'd' }, | |
161 | { "help", 0, 0, 'h' }, | |
162 | { "quiet", 0, 0, 'q' }, | |
163 | { "verbose", 0, 0, 'v' }, | |
164 | { "version", 0, 0, 'V' }, | |
3bd1e081 | 165 | { "kernel", 0, 0, 'k' }, |
74d0b642 | 166 | #ifdef HAVE_LIBLTTNG_UST_CTL |
3bd1e081 MD |
167 | { "ust", 0, 0, 'u' }, |
168 | #endif | |
d4a1283e JD |
169 | { NULL, 0, 0, 0 } |
170 | }; | |
171 | ||
172 | while (1) { | |
173 | int option_index = 0; | |
3bd1e081 | 174 | c = getopt_long(argc, argv, "dhqvVku" "c:e:", long_options, &option_index); |
d4a1283e JD |
175 | if (c == -1) { |
176 | break; | |
177 | } | |
178 | ||
179 | switch (c) { | |
914a571b JD |
180 | case 0: |
181 | fprintf(stderr, "option %s", long_options[option_index].name); | |
182 | if (optarg) { | |
183 | fprintf(stderr, " with arg %s\n", optarg); | |
184 | } | |
185 | break; | |
186 | case 'c': | |
187 | snprintf(command_sock_path, PATH_MAX, "%s", optarg); | |
188 | break; | |
189 | case 'e': | |
190 | snprintf(error_sock_path, PATH_MAX, "%s", optarg); | |
191 | break; | |
192 | case 'd': | |
193 | opt_daemon = 1; | |
194 | break; | |
195 | case 'h': | |
196 | usage(); | |
197 | exit(EXIT_FAILURE); | |
198 | case 'q': | |
199 | opt_quiet = 1; | |
200 | break; | |
201 | case 'v': | |
202 | opt_verbose = 1; | |
203 | break; | |
204 | case 'V': | |
205 | fprintf(stdout, "%s\n", VERSION); | |
206 | exit(EXIT_SUCCESS); | |
3bd1e081 MD |
207 | case 'k': |
208 | opt_type = LTTNG_CONSUMER_KERNEL; | |
209 | break; | |
74d0b642 | 210 | #ifdef HAVE_LIBLTTNG_UST_CTL |
3bd1e081 MD |
211 | case 'u': |
212 | opt_type = LTTNG_CONSUMER_UST; | |
213 | break; | |
214 | #endif | |
914a571b JD |
215 | default: |
216 | usage(); | |
217 | exit(EXIT_FAILURE); | |
d4a1283e JD |
218 | } |
219 | } | |
220 | } | |
221 | ||
d4a1283e JD |
222 | /* |
223 | * main | |
224 | */ | |
225 | int main(int argc, char **argv) | |
226 | { | |
227 | int i; | |
228 | int ret = 0; | |
229 | void *status; | |
230 | ||
231 | /* Parse arguments */ | |
232 | progname = argv[0]; | |
233 | parse_args(argc, argv); | |
234 | ||
235 | /* Daemonize */ | |
236 | if (opt_daemon) { | |
237 | ret = daemon(0, 0); | |
238 | if (ret < 0) { | |
239 | perror("daemon"); | |
240 | goto error; | |
241 | } | |
242 | } | |
243 | ||
244 | if (strlen(command_sock_path) == 0) { | |
245 | snprintf(command_sock_path, PATH_MAX, | |
3bd1e081 MD |
246 | opt_type == LTTNG_CONSUMER_KERNEL ? |
247 | KCONSUMERD_CMD_SOCK_PATH : | |
248 | USTCONSUMERD_CMD_SOCK_PATH); | |
d4a1283e | 249 | } |
5348b470 | 250 | /* create the consumer instance with and assign the callbacks */ |
d41f73b7 MD |
251 | ctx = lttng_consumer_create(opt_type, lttng_consumer_read_subbuffer, |
252 | NULL, lttng_consumer_on_recv_stream, NULL); | |
cb040cc1 JD |
253 | if (ctx == NULL) { |
254 | goto error; | |
255 | } | |
256 | ||
3bd1e081 | 257 | lttng_consumer_set_command_sock_path(ctx, command_sock_path); |
d4a1283e JD |
258 | if (strlen(error_sock_path) == 0) { |
259 | snprintf(error_sock_path, PATH_MAX, | |
3bd1e081 MD |
260 | opt_type == LTTNG_CONSUMER_KERNEL ? |
261 | KCONSUMERD_ERR_SOCK_PATH : | |
262 | USTCONSUMERD_ERR_SOCK_PATH); | |
d4a1283e JD |
263 | } |
264 | ||
265 | if (set_signal_handler() < 0) { | |
266 | goto error; | |
267 | } | |
268 | ||
32258573 | 269 | /* Connect to the socket created by lttng-sessiond to report errors */ |
d4a1283e | 270 | DBG("Connecting to error socket %s", error_sock_path); |
1ce86c9a | 271 | ret = lttcomm_connect_unix_sock(error_sock_path); |
32258573 | 272 | /* not a fatal error, but all communication with lttng-sessiond will fail */ |
1ce86c9a | 273 | if (ret < 0) { |
32258573 | 274 | WARN("Cannot connect to error socket, is lttng-sessiond started ?"); |
d4a1283e | 275 | } |
3bd1e081 | 276 | lttng_consumer_set_error_sock(ctx, ret); |
d4a1283e JD |
277 | |
278 | /* Create the thread to manage the receive of fd */ | |
3bd1e081 | 279 | ret = pthread_create(&threads[0], NULL, lttng_consumer_thread_receive_fds, |
cb040cc1 | 280 | (void *) ctx); |
d4a1283e JD |
281 | if (ret != 0) { |
282 | perror("pthread_create"); | |
283 | goto error; | |
284 | } | |
285 | ||
286 | /* Create thread to manage the polling/writing of traces */ | |
3bd1e081 | 287 | ret = pthread_create(&threads[1], NULL, lttng_consumer_thread_poll_fds, |
cb040cc1 | 288 | (void *) ctx); |
d4a1283e JD |
289 | if (ret != 0) { |
290 | perror("pthread_create"); | |
291 | goto error; | |
292 | } | |
293 | ||
294 | for (i = 0; i < 2; i++) { | |
295 | ret = pthread_join(threads[i], &status); | |
296 | if (ret != 0) { | |
297 | perror("pthread_join"); | |
298 | goto error; | |
299 | } | |
300 | } | |
301 | ret = EXIT_SUCCESS; | |
3bd1e081 | 302 | lttng_consumer_send_error(ctx, CONSUMERD_EXIT_SUCCESS); |
d4a1283e JD |
303 | goto end; |
304 | ||
305 | error: | |
306 | ret = EXIT_FAILURE; | |
3bd1e081 | 307 | lttng_consumer_send_error(ctx, CONSUMERD_EXIT_FAILURE); |
d4a1283e JD |
308 | |
309 | end: | |
3bd1e081 MD |
310 | lttng_consumer_destroy(ctx); |
311 | lttng_consumer_cleanup(); | |
d4a1283e JD |
312 | |
313 | return ret; | |
314 | } |