Create a library for the kernel consumer
[lttng-tools.git] / kconsumerd / kconsumerd.c
CommitLineData
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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>
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39
40#include "lttngerr.h"
41#include "libkernelctl.h"
42#include "liblttsessiondcomm.h"
1ce86c9a 43#include "liblttkconsumerd.h"
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44
45/* the two threads (receive fd and poll) */
1ce86c9a 46pthread_t threads[2];
d4a1283e 47
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48/* to count the number of time the user pressed ctrl+c */
49static int sigintcount = 0;
50
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51/* Argument variables */
52int opt_quiet;
53int opt_verbose;
54static int opt_daemon;
55static const char *progname;
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56char command_sock_path[PATH_MAX]; /* Global command socket path */
57char error_sock_path[PATH_MAX]; /* Global error path */
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58
59/*
60 * sighandler
61 *
62 * Signal handler for the daemon
63 */
64static void sighandler(int sig)
65{
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66 if (sig == SIGINT && sigintcount++ == 0) {
67 DBG("ignoring first SIGINT");
68 return;
69 }
70
1ce86c9a 71 kconsumerd_cleanup();
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72}
73
74/*
75 * set_signal_handler
76 *
77 * Setup signal handler for :
78 * SIGINT, SIGTERM, SIGPIPE
79 */
80static 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
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112/*
113 * usage function on stderr
114 */
115static 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 */
137static 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) {
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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);
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190 }
191 }
192}
193
194
195/*
196 * main
197 */
198int 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);
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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();
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233 if (ret < 0) {
234 perror("Error creating poll pipe");
235 goto end;
236 }
237
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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) {
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243 WARN("Cannot connect to error socket, is ltt-sessiond started ?");
244 }
1ce86c9a 245 kconsumerd_set_error_socket(ret);
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246
247 /* Create the thread to manage the receive of fd */
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248 ret = pthread_create(&threads[0], NULL, kconsumerd_thread_receive_fds,
249 (void *) NULL);
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250 if (ret != 0) {
251 perror("pthread_create");
252 goto error;
253 }
254
255 /* Create thread to manage the polling/writing of traces */
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256 ret = pthread_create(&threads[1], NULL, kconsumerd_thread_poll_fds,
257 (void *) NULL);
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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);
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272 goto end;
273
274error:
275 ret = EXIT_FAILURE;
1ce86c9a 276 kconsumerd_send_error(KCONSUMERD_EXIT_FAILURE);
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277
278end:
1ce86c9a 279 kconsumerd_cleanup();
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280
281 return ret;
282}
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