-/*
- * 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 <ltt-kconsumerd.h>
-#include <lttng-kernel-ctl.h>
-#include <lttng-sessiond-comm.h>
-#include <lttng/lttng-kconsumerd.h>
-#include <lttngerr.h>
-
-/* 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 */
-
-/* the liblttngkconsumerd context */
-static struct lttng_kconsumerd_local_data *ctx;
-
-/*
- * Signal handler for the daemon
- */
-static void sighandler(int sig)
-{
- if (sig == SIGINT && sigintcount++ == 0) {
- DBG("ignoring first SIGINT");
- return;
- }
-
- lttng_kconsumerd_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");
-}
-
-/*
- * 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' },
- { NULL, 0, 0, 0 }
- };
-
- while (1) {
- int option_index = 0;
- c = getopt_long(argc, argv, "dhqvV" "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);
- default:
- usage();
- exit(EXIT_FAILURE);
- }
- }
-}
-
-/*
- * Consume data on a file descriptor and write it on a trace file.
- */
-static int read_subbuffer(struct lttng_kconsumerd_fd *kconsumerd_fd)
-{
- unsigned long len;
- int err;
- long ret = 0;
- int infd = kconsumerd_fd->consumerd_fd;
-
- DBG("In kconsumerd_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 (kconsumerd_fd->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_kconsumerd_on_read_subbuffer_splice(ctx, kconsumerd_fd, 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_kconsumerd_on_read_subbuffer_mmap(ctx, kconsumerd_fd, 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_fd(struct lttng_kconsumerd_fd *kconsumerd_fd)
-{
- int ret;
-
- /* Opening the tracefile in write mode */
- if (kconsumerd_fd->path_name != NULL) {
- ret = open(kconsumerd_fd->path_name,
- O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG|S_IRWXO);
- if (ret < 0) {
- ERR("Opening %s", kconsumerd_fd->path_name);
- perror("open");
- goto error;
- }
- kconsumerd_fd->out_fd = ret;
- }
-
- if (kconsumerd_fd->output == LTTNG_EVENT_MMAP) {
- /* get the len of the mmap region */
- unsigned long mmap_len;
-
- ret = kernctl_get_mmap_len(kconsumerd_fd->consumerd_fd, &mmap_len);
- if (ret != 0) {
- ret = errno;
- perror("kernctl_get_mmap_len");
- goto error_close_fd;
- }
- kconsumerd_fd->mmap_len = (size_t) mmap_len;
-
- kconsumerd_fd->mmap_base = mmap(NULL, kconsumerd_fd->mmap_len,
- PROT_READ, MAP_PRIVATE, kconsumerd_fd->consumerd_fd, 0);
- if (kconsumerd_fd->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(kconsumerd_fd->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,
- KCONSUMERD_CMD_SOCK_PATH);
- }
- /* create the consumer instance with and assign the callbacks */
- ctx = lttng_kconsumerd_create(read_subbuffer, on_recv_fd, NULL);
- if (ctx == NULL) {
- goto error;
- }
-
- lttng_kconsumerd_set_command_sock_path(ctx, command_sock_path);
- if (strlen(error_sock_path) == 0) {
- snprintf(error_sock_path, PATH_MAX,
- KCONSUMERD_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_kconsumerd_set_error_sock(ctx, ret);
-
- /* Create the thread to manage the receive of fd */
- ret = pthread_create(&threads[0], NULL, lttng_kconsumerd_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_kconsumerd_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_kconsumerd_send_error(ctx, KCONSUMERD_EXIT_SUCCESS);
- goto end;
-
-error:
- ret = EXIT_FAILURE;
- lttng_kconsumerd_send_error(ctx, KCONSUMERD_EXIT_FAILURE);
-
-end:
- lttng_kconsumerd_destroy(ctx);
- lttng_kconsumerd_cleanup();
-
- return ret;
-}
projects / lttng-tools.git / blobdiff