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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 | |
7 | * as published by the Free Software Foundation; either version 2 | |
8 | * of the License, or (at your option) any later version. | |
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" | |
41 | #include "libkernelctl.h" | |
42 | #include "liblttsessiondcomm.h" | |
1ce86c9a | 43 | #include "liblttkconsumerd.h" |
d4a1283e JD |
44 | |
45 | /* the two threads (receive fd and poll) */ | |
1ce86c9a | 46 | pthread_t threads[2]; |
d4a1283e | 47 | |
13e44745 JD |
48 | /* to count the number of time the user pressed ctrl+c */ |
49 | static int sigintcount = 0; | |
50 | ||
d4a1283e JD |
51 | /* Argument variables */ |
52 | int opt_quiet; | |
53 | int opt_verbose; | |
54 | static int opt_daemon; | |
55 | static const char *progname; | |
1ce86c9a JD |
56 | char command_sock_path[PATH_MAX]; /* Global command socket path */ |
57 | char error_sock_path[PATH_MAX]; /* Global error path */ | |
d4a1283e JD |
58 | |
59 | /* | |
60 | * sighandler | |
61 | * | |
62 | * Signal handler for the daemon | |
63 | */ | |
64 | static void sighandler(int sig) | |
65 | { | |
13e44745 JD |
66 | if (sig == SIGINT && sigintcount++ == 0) { |
67 | DBG("ignoring first SIGINT"); | |
68 | return; | |
69 | } | |
70 | ||
1ce86c9a | 71 | kconsumerd_cleanup(); |
d4a1283e JD |
72 | } |
73 | ||
74 | /* | |
75 | * set_signal_handler | |
76 | * | |
77 | * Setup signal handler for : | |
78 | * SIGINT, SIGTERM, SIGPIPE | |
79 | */ | |
80 | static int set_signal_handler(void) | |
81 | { | |
82 | int ret = 0; | |
83 | struct sigaction sa; | |
84 | sigset_t sigset; | |
85 | ||
86 | if ((ret = sigemptyset(&sigset)) < 0) { | |
87 | perror("sigemptyset"); | |
88 | return ret; | |
89 | } | |
90 | ||
91 | sa.sa_handler = sighandler; | |
92 | sa.sa_mask = sigset; | |
93 | sa.sa_flags = 0; | |
94 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
95 | perror("sigaction"); | |
96 | return ret; | |
97 | } | |
98 | ||
99 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { | |
100 | perror("sigaction"); | |
101 | return ret; | |
102 | } | |
103 | ||
104 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
105 | perror("sigaction"); | |
106 | return ret; | |
107 | } | |
108 | ||
109 | return ret; | |
110 | } | |
111 | ||
d4a1283e JD |
112 | /* |
113 | * usage function on stderr | |
114 | */ | |
115 | static void usage(void) | |
116 | { | |
117 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); | |
118 | fprintf(stderr, " -h, --help " | |
119 | "Display this usage.\n"); | |
120 | fprintf(stderr, " -c, --kconsumerd-cmd-sock PATH " | |
121 | "Specify path for the command socket\n"); | |
122 | fprintf(stderr, " -e, --kconsumerd-err-sock PATH " | |
123 | "Specify path for the error socket\n"); | |
124 | fprintf(stderr, " -d, --daemonize " | |
125 | "Start as a daemon.\n"); | |
126 | fprintf(stderr, " -q, --quiet " | |
127 | "No output at all.\n"); | |
128 | fprintf(stderr, " -v, --verbose " | |
129 | "Verbose mode. Activate DBG() macro.\n"); | |
130 | fprintf(stderr, " -V, --version " | |
131 | "Show version number.\n"); | |
132 | } | |
133 | ||
134 | /* | |
135 | * daemon argument parsing | |
136 | */ | |
137 | static void parse_args(int argc, char **argv) | |
138 | { | |
139 | int c; | |
140 | ||
141 | static struct option long_options[] = { | |
142 | { "kconsumerd-cmd-sock", 1, 0, 'c' }, | |
143 | { "kconsumerd-err-sock", 1, 0, 'e' }, | |
144 | { "daemonize", 0, 0, 'd' }, | |
145 | { "help", 0, 0, 'h' }, | |
146 | { "quiet", 0, 0, 'q' }, | |
147 | { "verbose", 0, 0, 'v' }, | |
148 | { "version", 0, 0, 'V' }, | |
149 | { NULL, 0, 0, 0 } | |
150 | }; | |
151 | ||
152 | while (1) { | |
153 | int option_index = 0; | |
154 | c = getopt_long(argc, argv, "dhqvV" "c:e:", long_options, &option_index); | |
155 | if (c == -1) { | |
156 | break; | |
157 | } | |
158 | ||
159 | switch (c) { | |
914a571b JD |
160 | case 0: |
161 | fprintf(stderr, "option %s", long_options[option_index].name); | |
162 | if (optarg) { | |
163 | fprintf(stderr, " with arg %s\n", optarg); | |
164 | } | |
165 | break; | |
166 | case 'c': | |
167 | snprintf(command_sock_path, PATH_MAX, "%s", optarg); | |
168 | break; | |
169 | case 'e': | |
170 | snprintf(error_sock_path, PATH_MAX, "%s", optarg); | |
171 | break; | |
172 | case 'd': | |
173 | opt_daemon = 1; | |
174 | break; | |
175 | case 'h': | |
176 | usage(); | |
177 | exit(EXIT_FAILURE); | |
178 | case 'q': | |
179 | opt_quiet = 1; | |
180 | break; | |
181 | case 'v': | |
182 | opt_verbose = 1; | |
183 | break; | |
184 | case 'V': | |
185 | fprintf(stdout, "%s\n", VERSION); | |
186 | exit(EXIT_SUCCESS); | |
187 | default: | |
188 | usage(); | |
189 | exit(EXIT_FAILURE); | |
d4a1283e JD |
190 | } |
191 | } | |
192 | } | |
193 | ||
194 | ||
195 | /* | |
196 | * main | |
197 | */ | |
198 | int main(int argc, char **argv) | |
199 | { | |
200 | int i; | |
201 | int ret = 0; | |
202 | void *status; | |
203 | ||
204 | /* Parse arguments */ | |
205 | progname = argv[0]; | |
206 | parse_args(argc, argv); | |
207 | ||
208 | /* Daemonize */ | |
209 | if (opt_daemon) { | |
210 | ret = daemon(0, 0); | |
211 | if (ret < 0) { | |
212 | perror("daemon"); | |
213 | goto error; | |
214 | } | |
215 | } | |
216 | ||
217 | if (strlen(command_sock_path) == 0) { | |
218 | snprintf(command_sock_path, PATH_MAX, | |
219 | KCONSUMERD_CMD_SOCK_PATH); | |
220 | } | |
1ce86c9a | 221 | kconsumerd_set_command_socket_path(command_sock_path); |
d4a1283e JD |
222 | if (strlen(error_sock_path) == 0) { |
223 | snprintf(error_sock_path, PATH_MAX, | |
224 | KCONSUMERD_ERR_SOCK_PATH); | |
225 | } | |
226 | ||
227 | if (set_signal_handler() < 0) { | |
228 | goto error; | |
229 | } | |
230 | ||
252fd492 | 231 | /* create the pipe to wake to polling thread when needed */ |
1ce86c9a | 232 | ret = kconsumerd_create_poll_pipe(); |
252fd492 JD |
233 | if (ret < 0) { |
234 | perror("Error creating poll pipe"); | |
235 | goto end; | |
236 | } | |
237 | ||
d4a1283e JD |
238 | /* Connect to the socket created by ltt-sessiond to report errors */ |
239 | DBG("Connecting to error socket %s", error_sock_path); | |
1ce86c9a | 240 | ret = lttcomm_connect_unix_sock(error_sock_path); |
d4a1283e | 241 | /* not a fatal error, but all communication with ltt-sessiond will fail */ |
1ce86c9a | 242 | if (ret < 0) { |
d4a1283e JD |
243 | WARN("Cannot connect to error socket, is ltt-sessiond started ?"); |
244 | } | |
1ce86c9a | 245 | kconsumerd_set_error_socket(ret); |
d4a1283e JD |
246 | |
247 | /* Create the thread to manage the receive of fd */ | |
1ce86c9a JD |
248 | ret = pthread_create(&threads[0], NULL, kconsumerd_thread_receive_fds, |
249 | (void *) NULL); | |
d4a1283e JD |
250 | if (ret != 0) { |
251 | perror("pthread_create"); | |
252 | goto error; | |
253 | } | |
254 | ||
255 | /* Create thread to manage the polling/writing of traces */ | |
1ce86c9a JD |
256 | ret = pthread_create(&threads[1], NULL, kconsumerd_thread_poll_fds, |
257 | (void *) NULL); | |
d4a1283e JD |
258 | if (ret != 0) { |
259 | perror("pthread_create"); | |
260 | goto error; | |
261 | } | |
262 | ||
263 | for (i = 0; i < 2; i++) { | |
264 | ret = pthread_join(threads[i], &status); | |
265 | if (ret != 0) { | |
266 | perror("pthread_join"); | |
267 | goto error; | |
268 | } | |
269 | } | |
270 | ret = EXIT_SUCCESS; | |
1ce86c9a | 271 | kconsumerd_send_error(KCONSUMERD_EXIT_SUCCESS); |
d4a1283e JD |
272 | goto end; |
273 | ||
274 | error: | |
275 | ret = EXIT_FAILURE; | |
1ce86c9a | 276 | kconsumerd_send_error(KCONSUMERD_EXIT_FAILURE); |
d4a1283e JD |
277 | |
278 | end: | |
1ce86c9a | 279 | kconsumerd_cleanup(); |
d4a1283e JD |
280 | |
281 | return ret; | |
282 | } |