--- /dev/null
+/*
+ * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
+ * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; only version 2
+ * of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#define _GNU_SOURCE
+#include <fcntl.h>
+#include <getopt.h>
+#include <grp.h>
+#include <limits.h>
+#include <pthread.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ipc.h>
+#include <sys/shm.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <urcu/list.h>
+#include <poll.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <assert.h>
+#include <config.h>
+
+#include <lttng-consumerd.h>
+#include <lttng-kernel-ctl.h>
+#include <lttng-sessiond-comm.h>
+#include <lttng/lttng-kconsumer.h>
+#include <lttng/lttng-ustconsumer.h>
+#include <lttngerr.h>
+
+/* TODO : support UST (all direct kernctl accesses). */
+
+/* the two threads (receive fd and poll) */
+static pthread_t threads[2];
+
+/* to count the number of time the user pressed ctrl+c */
+static int sigintcount = 0;
+
+/* Argument variables */
+int opt_quiet;
+int opt_verbose;
+static int opt_daemon;
+static const char *progname;
+static char command_sock_path[PATH_MAX]; /* Global command socket path */
+static char error_sock_path[PATH_MAX]; /* Global error path */
+static enum lttng_consumer_type opt_type = LTTNG_CONSUMER_KERNEL;
+
+/* the liblttngkconsumerd context */
+static struct lttng_consumer_local_data *ctx;
+
+/*
+ * Signal handler for the daemon
+ */
+static void sighandler(int sig)
+{
+ if (sig == SIGINT && sigintcount++ == 0) {
+ DBG("ignoring first SIGINT");
+ return;
+ }
+
+ lttng_consumer_should_exit(ctx);
+}
+
+/*
+ * Setup signal handler for :
+ * SIGINT, SIGTERM, SIGPIPE
+ */
+static int set_signal_handler(void)
+{
+ int ret = 0;
+ struct sigaction sa;
+ sigset_t sigset;
+
+ if ((ret = sigemptyset(&sigset)) < 0) {
+ perror("sigemptyset");
+ return ret;
+ }
+
+ sa.sa_handler = sighandler;
+ sa.sa_mask = sigset;
+ sa.sa_flags = 0;
+ if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
+ perror("sigaction");
+ return ret;
+ }
+
+ if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
+ perror("sigaction");
+ return ret;
+ }
+
+ if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
+ perror("sigaction");
+ return ret;
+ }
+
+ return ret;
+}
+
+/*
+ * usage function on stderr
+ */
+static void usage(void)
+{
+ fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
+ fprintf(stderr, " -h, --help "
+ "Display this usage.\n");
+ fprintf(stderr, " -c, --kconsumerd-cmd-sock PATH "
+ "Specify path for the command socket\n");
+ fprintf(stderr, " -e, --kconsumerd-err-sock PATH "
+ "Specify path for the error socket\n");
+ fprintf(stderr, " -d, --daemonize "
+ "Start as a daemon.\n");
+ fprintf(stderr, " -q, --quiet "
+ "No output at all.\n");
+ fprintf(stderr, " -v, --verbose "
+ "Verbose mode. Activate DBG() macro.\n");
+ fprintf(stderr, " -V, --version "
+ "Show version number.\n");
+ fprintf(stderr, " -k, --kernel "
+ "Consumer kernel buffers (default).\n");
+ fprintf(stderr, " -u, --ust "
+ "Consumer UST buffers.%s\n",
+#ifdef CONFIG_LTTNG_TOOLS_HAVE_UST
+ ""
+#else
+ " (support not compiled in)"
+#endif
+ );
+}
+
+/*
+ * daemon argument parsing
+ */
+static void parse_args(int argc, char **argv)
+{
+ int c;
+
+ static struct option long_options[] = {
+ { "kconsumerd-cmd-sock", 1, 0, 'c' },
+ { "kconsumerd-err-sock", 1, 0, 'e' },
+ { "daemonize", 0, 0, 'd' },
+ { "help", 0, 0, 'h' },
+ { "quiet", 0, 0, 'q' },
+ { "verbose", 0, 0, 'v' },
+ { "version", 0, 0, 'V' },
+ { "kernel", 0, 0, 'k' },
+#ifdef CONFIG_LTTNG_TOOLS_HAVE_UST
+ { "ust", 0, 0, 'u' },
+#endif
+ { NULL, 0, 0, 0 }
+ };
+
+ while (1) {
+ int option_index = 0;
+ c = getopt_long(argc, argv, "dhqvVku" "c:e:", long_options, &option_index);
+ if (c == -1) {
+ break;
+ }
+
+ switch (c) {
+ case 0:
+ fprintf(stderr, "option %s", long_options[option_index].name);
+ if (optarg) {
+ fprintf(stderr, " with arg %s\n", optarg);
+ }
+ break;
+ case 'c':
+ snprintf(command_sock_path, PATH_MAX, "%s", optarg);
+ break;
+ case 'e':
+ snprintf(error_sock_path, PATH_MAX, "%s", optarg);
+ break;
+ case 'd':
+ opt_daemon = 1;
+ break;
+ case 'h':
+ usage();
+ exit(EXIT_FAILURE);
+ case 'q':
+ opt_quiet = 1;
+ break;
+ case 'v':
+ opt_verbose = 1;
+ break;
+ case 'V':
+ fprintf(stdout, "%s\n", VERSION);
+ exit(EXIT_SUCCESS);
+ case 'k':
+ opt_type = LTTNG_CONSUMER_KERNEL;
+ break;
+#ifdef CONFIG_LTTNG_TOOLS_HAVE_UST
+ case 'u':
+ opt_type = LTTNG_CONSUMER_UST;
+ break;
+#endif
+ default:
+ usage();
+ exit(EXIT_FAILURE);
+ }
+ }
+}
+
+/*
+ * Consume data on a file descriptor and write it on a trace file.
+ */
+static int read_subbuffer(struct lttng_consumer_stream *stream)
+{
+ unsigned long len;
+ int err;
+ long ret = 0;
+ int infd = stream->wait_fd;
+
+ DBG("In read_subbuffer (infd : %d)", infd);
+ /* Get the next subbuffer */
+ err = kernctl_get_next_subbuf(infd);
+ if (err != 0) {
+ ret = errno;
+ /*
+ * This is a debug message even for single-threaded consumer,
+ * because poll() have more relaxed criterions than get subbuf,
+ * so get_subbuf may fail for short race windows where poll()
+ * would issue wakeups.
+ */
+ DBG("Reserving sub buffer failed (everything is normal, "
+ "it is due to concurrency)");
+ goto end;
+ }
+
+ switch (stream->output) {
+ case LTTNG_EVENT_SPLICE:
+ /* read the whole subbuffer */
+ err = kernctl_get_padded_subbuf_size(infd, &len);
+ if (err != 0) {
+ ret = errno;
+ perror("Getting sub-buffer len failed.");
+ goto end;
+ }
+
+ /* splice the subbuffer to the tracefile */
+ ret = lttng_consumer_on_read_subbuffer_splice(ctx, stream, len);
+ if (ret < 0) {
+ /*
+ * display the error but continue processing to try
+ * to release the subbuffer
+ */
+ ERR("Error splicing to tracefile");
+ }
+ break;
+ case LTTNG_EVENT_MMAP:
+ /* read the used subbuffer size */
+ err = kernctl_get_padded_subbuf_size(infd, &len);
+ if (err != 0) {
+ ret = errno;
+ perror("Getting sub-buffer len failed.");
+ goto end;
+ }
+ /* write the subbuffer to the tracefile */
+ ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len);
+ if (ret < 0) {
+ /*
+ * display the error but continue processing to try
+ * to release the subbuffer
+ */
+ ERR("Error writing to tracefile");
+ }
+ break;
+ default:
+ ERR("Unknown output method");
+ ret = -1;
+ }
+
+ err = kernctl_put_next_subbuf(infd);
+ if (err != 0) {
+ ret = errno;
+ if (errno == EFAULT) {
+ perror("Error in unreserving sub buffer\n");
+ } else if (errno == EIO) {
+ /* Should never happen with newer LTTng versions */
+ perror("Reader has been pushed by the writer, last sub-buffer corrupted.");
+ }
+ goto end;
+ }
+
+end:
+ return ret;
+}
+
+static int on_recv_stream(struct lttng_consumer_stream *stream)
+{
+ int ret;
+
+ /* Opening the tracefile in write mode */
+ if (stream->path_name != NULL) {
+ ret = open(stream->path_name,
+ O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG|S_IRWXO);
+ if (ret < 0) {
+ ERR("Opening %s", stream->path_name);
+ perror("open");
+ goto error;
+ }
+ stream->out_fd = ret;
+ }
+
+ if (stream->output == LTTNG_EVENT_MMAP) {
+ /* get the len of the mmap region */
+ unsigned long mmap_len;
+
+ ret = kernctl_get_mmap_len(stream->wait_fd, &mmap_len);
+ if (ret != 0) {
+ ret = errno;
+ perror("kernctl_get_mmap_len");
+ goto error_close_fd;
+ }
+ stream->mmap_len = (size_t) mmap_len;
+
+ stream->mmap_base = mmap(NULL, stream->mmap_len,
+ PROT_READ, MAP_PRIVATE, stream->wait_fd, 0);
+ if (stream->mmap_base == MAP_FAILED) {
+ perror("Error mmaping");
+ ret = -1;
+ goto error_close_fd;
+ }
+ }
+
+ /* we return 0 to let the library handle the FD internally */
+ return 0;
+
+error_close_fd:
+ {
+ int err;
+
+ err = close(stream->out_fd);
+ assert(!err);
+ }
+error:
+ return ret;
+}
+
+/*
+ * main
+ */
+int main(int argc, char **argv)
+{
+ int i;
+ int ret = 0;
+ void *status;
+
+ /* Parse arguments */
+ progname = argv[0];
+ parse_args(argc, argv);
+
+ /* Daemonize */
+ if (opt_daemon) {
+ ret = daemon(0, 0);
+ if (ret < 0) {
+ perror("daemon");
+ goto error;
+ }
+ }
+
+ if (strlen(command_sock_path) == 0) {
+ snprintf(command_sock_path, PATH_MAX,
+ opt_type == LTTNG_CONSUMER_KERNEL ?
+ KCONSUMERD_CMD_SOCK_PATH :
+ USTCONSUMERD_CMD_SOCK_PATH);
+ }
+ /* create the consumer instance with and assign the callbacks */
+ ctx = lttng_consumer_create(opt_type, read_subbuffer, NULL, on_recv_stream, NULL);
+ if (ctx == NULL) {
+ goto error;
+ }
+
+ lttng_consumer_set_command_sock_path(ctx, command_sock_path);
+ if (strlen(error_sock_path) == 0) {
+ snprintf(error_sock_path, PATH_MAX,
+ opt_type == LTTNG_CONSUMER_KERNEL ?
+ KCONSUMERD_ERR_SOCK_PATH :
+ USTCONSUMERD_ERR_SOCK_PATH);
+ }
+
+ if (set_signal_handler() < 0) {
+ goto error;
+ }
+
+ /* Connect to the socket created by ltt-sessiond to report errors */
+ DBG("Connecting to error socket %s", error_sock_path);
+ ret = lttcomm_connect_unix_sock(error_sock_path);
+ /* not a fatal error, but all communication with ltt-sessiond will fail */
+ if (ret < 0) {
+ WARN("Cannot connect to error socket, is ltt-sessiond started ?");
+ }
+ lttng_consumer_set_error_sock(ctx, ret);
+
+ /* Create the thread to manage the receive of fd */
+ ret = pthread_create(&threads[0], NULL, lttng_consumer_thread_receive_fds,
+ (void *) ctx);
+ if (ret != 0) {
+ perror("pthread_create");
+ goto error;
+ }
+
+ /* Create thread to manage the polling/writing of traces */
+ ret = pthread_create(&threads[1], NULL, lttng_consumer_thread_poll_fds,
+ (void *) ctx);
+ if (ret != 0) {
+ perror("pthread_create");
+ goto error;
+ }
+
+ for (i = 0; i < 2; i++) {
+ ret = pthread_join(threads[i], &status);
+ if (ret != 0) {
+ perror("pthread_join");
+ goto error;
+ }
+ }
+ ret = EXIT_SUCCESS;
+ lttng_consumer_send_error(ctx, CONSUMERD_EXIT_SUCCESS);
+ goto end;
+
+error:
+ ret = EXIT_FAILURE;
+ lttng_consumer_send_error(ctx, CONSUMERD_EXIT_FAILURE);
+
+end:
+ lttng_consumer_destroy(ctx);
+ lttng_consumer_cleanup();
+
+ return ret;
+}
projects / lttng-tools.git / blobdiff