src/bin/lttng-consumerd/lttng-consumerd.c

   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; only version 2
   8  * of the License.
   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>
  38 #include <sys/mman.h>
  39 #include <assert.h>
  40 #include <config.h>
  41 #include <urcu/compiler.h>
  42
  43 #include <common/lttngerr.h>
  44 #include <common/kernel-ctl/kernel-ctl.h>
  45 #include <common/sessiond-comm/sessiond-comm.h>
  46 #include <common/kernel-consumer/kernel-consumer.h>
  47 #include <common/ust-consumer/ust-consumer.h>
  48
  49 #include "lttng-consumerd.h"
  50
  51 /* TODO : support UST (all direct kernctl accesses). */
  52
  53 /* the two threads (receive fd and poll) */
  54 static pthread_t threads[2];
  55
  56 /* to count the number of time the user pressed ctrl+c */
  57 static int sigintcount = 0;
  58
  59 /* Argument variables */
  60 int opt_quiet;
  61 int opt_verbose;
  62 static int opt_daemon;
  63 static const char *progname;
  64 static char command_sock_path[PATH_MAX]; /* Global command socket path */
  65 static char error_sock_path[PATH_MAX]; /* Global error path */
  66 static enum lttng_consumer_type opt_type = LTTNG_CONSUMER_KERNEL;
  67
  68 /* the liblttngconsumerd context */
  69 static struct lttng_consumer_local_data *ctx;
  70
  71 /*
  72  * Signal handler for the daemon
  73  */
  74 static void sighandler(int sig)
  75 {
  76         if (sig == SIGINT && sigintcount++ == 0) {
  77                 DBG("ignoring first SIGINT");
  78                 return;
  79         }
  80
  81         lttng_consumer_should_exit(ctx);
  82 }
  83
  84 /*
  85  * Setup signal handler for :
  86  *      SIGINT, SIGTERM, SIGPIPE
  87  */
  88 static int set_signal_handler(void)
  89 {
  90         int ret = 0;
  91         struct sigaction sa;
  92         sigset_t sigset;
  93
  94         if ((ret = sigemptyset(&sigset)) < 0) {
  95                 perror("sigemptyset");
  96                 return ret;
  97         }
  98
  99         sa.sa_handler = sighandler;
 100         sa.sa_mask = sigset;
 101         sa.sa_flags = 0;
 102         if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
 103                 perror("sigaction");
 104                 return ret;
 105         }
 106
 107         if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
 108                 perror("sigaction");
 109                 return ret;
 110         }
 111
 112         if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
 113                 perror("sigaction");
 114                 return ret;
 115         }
 116
 117         return ret;
 118 }
 119
 120 /*
 121  * usage function on stderr
 122  */
 123 static void usage(void)
 124 {
 125         fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
 126         fprintf(stderr, "  -h, --help                         "
 127                         "Display this usage.\n");
 128         fprintf(stderr, "  -c, --consumerd-cmd-sock PATH     "
 129                         "Specify path for the command socket\n");
 130         fprintf(stderr, "  -e, --consumerd-err-sock PATH     "
 131                         "Specify path for the error socket\n");
 132         fprintf(stderr, "  -d, --daemonize                    "
 133                         "Start as a daemon.\n");
 134         fprintf(stderr, "  -q, --quiet                        "
 135                         "No output at all.\n");
 136         fprintf(stderr, "  -v, --verbose                      "
 137                         "Verbose mode. Activate DBG() macro.\n");
 138         fprintf(stderr, "  -V, --version                      "
 139                         "Show version number.\n");
 140         fprintf(stderr, "  -k, --kernel                       "
 141                         "Consumer kernel buffers (default).\n");
 142         fprintf(stderr, "  -u, --ust                          "
 143                         "Consumer UST buffers.%s\n",
 144 #ifdef HAVE_LIBLTTNG_UST_CTL
 145                         ""
 146 #else
 147                         " (support not compiled in)"
 148 #endif
 149                         );
 150 }
 151
 152 /*
 153  * daemon argument parsing
 154  */
 155 static void parse_args(int argc, char **argv)
 156 {
 157         int c;
 158
 159         static struct option long_options[] = {
 160                 { "consumerd-cmd-sock", 1, 0, 'c' },
 161                 { "consumerd-err-sock", 1, 0, 'e' },
 162                 { "daemonize", 0, 0, 'd' },
 163                 { "help", 0, 0, 'h' },
 164                 { "quiet", 0, 0, 'q' },
 165                 { "verbose", 0, 0, 'v' },
 166                 { "version", 0, 0, 'V' },
 167                 { "kernel", 0, 0, 'k' },
 168 #ifdef HAVE_LIBLTTNG_UST_CTL
 169                 { "ust", 0, 0, 'u' },
 170 #endif
 171                 { NULL, 0, 0, 0 }
 172         };
 173
 174         while (1) {
 175                 int option_index = 0;
 176                 c = getopt_long(argc, argv, "dhqvVku" "c:e:", long_options, &option_index);
 177                 if (c == -1) {
 178                         break;
 179                 }
 180
 181                 switch (c) {
 182                 case 0:
 183                         fprintf(stderr, "option %s", long_options[option_index].name);
 184                         if (optarg) {
 185                                 fprintf(stderr, " with arg %s\n", optarg);
 186                         }
 187                         break;
 188                 case 'c':
 189                         snprintf(command_sock_path, PATH_MAX, "%s", optarg);
 190                         break;
 191                 case 'e':
 192                         snprintf(error_sock_path, PATH_MAX, "%s", optarg);
 193                         break;
 194                 case 'd':
 195                         opt_daemon = 1;
 196                         break;
 197                 case 'h':
 198                         usage();
 199                         exit(EXIT_FAILURE);
 200                 case 'q':
 201                         opt_quiet = 1;
 202                         break;
 203                 case 'v':
 204                         opt_verbose = 1;
 205                         break;
 206                 case 'V':
 207                         fprintf(stdout, "%s\n", VERSION);
 208                         exit(EXIT_SUCCESS);
 209                 case 'k':
 210                         opt_type = LTTNG_CONSUMER_KERNEL;
 211                         break;
 212 #ifdef HAVE_LIBLTTNG_UST_CTL
 213                 case 'u':
 214 # if (CAA_BITS_PER_LONG == 64)
 215                         opt_type = LTTNG_CONSUMER64_UST;
 216 # elif (CAA_BITS_PER_LONG == 32)
 217                         opt_type = LTTNG_CONSUMER32_UST;
 218 # else
 219 #  error "Unknown bitness"
 220 # endif
 221                         break;
 222 #endif
 223                 default:
 224                         usage();
 225                         exit(EXIT_FAILURE);
 226                 }
 227         }
 228 }
 229
 230 /*
 231  * main
 232  */
 233 int main(int argc, char **argv)
 234 {
 235         int i;
 236         int ret = 0;
 237         void *status;
 238
 239         /* Parse arguments */
 240         progname = argv[0];
 241         parse_args(argc, argv);
 242
 243         /* Daemonize */
 244         if (opt_daemon) {
 245                 ret = daemon(0, 0);
 246                 if (ret < 0) {
 247                         perror("daemon");
 248                         goto error;
 249                 }
 250         }
 251
 252         if (strlen(command_sock_path) == 0) {
 253                 switch (opt_type) {
 254                 case LTTNG_CONSUMER_KERNEL:
 255                         snprintf(command_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH,
 256                                         LTTNG_RUNDIR);
 257                         break;
 258                 case LTTNG_CONSUMER64_UST:
 259                         snprintf(command_sock_path, PATH_MAX,
 260                                         USTCONSUMERD64_CMD_SOCK_PATH, LTTNG_RUNDIR);
 261                         break;
 262                 case LTTNG_CONSUMER32_UST:
 263                         snprintf(command_sock_path, PATH_MAX,
 264                                         USTCONSUMERD32_CMD_SOCK_PATH, LTTNG_RUNDIR);
 265                         break;
 266                 default:
 267                         WARN("Unknown consumerd type");
 268                         goto error;
 269                 }
 270         }
 271
 272         /* Init */
 273         lttng_consumer_init();
 274
 275         /* create the consumer instance with and assign the callbacks */
 276         ctx = lttng_consumer_create(opt_type, lttng_consumer_read_subbuffer,
 277                 NULL, lttng_consumer_on_recv_stream, NULL);
 278         if (ctx == NULL) {
 279                 goto error;
 280         }
 281
 282         lttng_consumer_set_command_sock_path(ctx, command_sock_path);
 283         if (strlen(error_sock_path) == 0) {
 284                 switch (opt_type) {
 285                 case LTTNG_CONSUMER_KERNEL:
 286                         snprintf(error_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH,
 287                                         LTTNG_RUNDIR);
 288                         break;
 289                 case LTTNG_CONSUMER64_UST:
 290                         snprintf(error_sock_path, PATH_MAX,
 291                                         USTCONSUMERD64_ERR_SOCK_PATH, LTTNG_RUNDIR);
 292                         break;
 293                 case LTTNG_CONSUMER32_UST:
 294                         snprintf(error_sock_path, PATH_MAX,
 295                                         USTCONSUMERD32_ERR_SOCK_PATH, LTTNG_RUNDIR);
 296                         break;
 297                 default:
 298                         WARN("Unknown consumerd type");
 299                         goto error;
 300                 }
 301         }
 302
 303         if (set_signal_handler() < 0) {
 304                 goto error;
 305         }
 306
 307         /* Connect to the socket created by lttng-sessiond to report errors */
 308         DBG("Connecting to error socket %s", error_sock_path);
 309         ret = lttcomm_connect_unix_sock(error_sock_path);
 310         /* not a fatal error, but all communication with lttng-sessiond will fail */
 311         if (ret < 0) {
 312                 WARN("Cannot connect to error socket, is lttng-sessiond started ?");
 313         }
 314         lttng_consumer_set_error_sock(ctx, ret);
 315
 316         /* Create the thread to manage the receive of fd */
 317         ret = pthread_create(&threads[0], NULL, lttng_consumer_thread_receive_fds,
 318                         (void *) ctx);
 319         if (ret != 0) {
 320                 perror("pthread_create");
 321                 goto error;
 322         }
 323
 324         /* Create thread to manage the polling/writing of traces */
 325         ret = pthread_create(&threads[1], NULL, lttng_consumer_thread_poll_fds,
 326                         (void *) ctx);
 327         if (ret != 0) {
 328                 perror("pthread_create");
 329                 goto error;
 330         }
 331
 332         for (i = 0; i < 2; i++) {
 333                 ret = pthread_join(threads[i], &status);
 334                 if (ret != 0) {
 335                         perror("pthread_join");
 336                         goto error;
 337                 }
 338         }
 339         ret = EXIT_SUCCESS;
 340         lttng_consumer_send_error(ctx, CONSUMERD_EXIT_SUCCESS);
 341         goto end;
 342
 343 error:
 344         ret = EXIT_FAILURE;
 345         lttng_consumer_send_error(ctx, CONSUMERD_EXIT_FAILURE);
 346
 347 end:
 348         lttng_consumer_destroy(ctx);
 349         lttng_consumer_cleanup();
 350
 351         return ret;
 352 }