*
* 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; either version 2
- * of the License, or (at your option) any later version.
+ * 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
#include <poll.h>
#include <unistd.h>
#include <sys/mman.h>
+#include <assert.h>
-#include "lttngerr.h"
-#include "libkernelctl.h"
-#include "liblttkconsumerd.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) */
-pthread_t threads[2];
+static pthread_t threads[2];
/* to count the number of time the user pressed ctrl+c */
static int sigintcount = 0;
int opt_verbose;
static int opt_daemon;
static const char *progname;
-char command_sock_path[PATH_MAX]; /* Global command socket path */
-char error_sock_path[PATH_MAX]; /* Global error path */
+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;
/*
- * sighandler
- *
- * Signal handler for the daemon
+ * Signal handler for the daemon
*/
static void sighandler(int sig)
{
return;
}
- kconsumerd_should_exit();
+ lttng_kconsumerd_should_exit(ctx);
}
/*
- * set_signal_handler
- *
- * Setup signal handler for :
+ * Setup signal handler for :
* SIGINT, SIGTERM, SIGPIPE
*/
static int set_signal_handler(void)
}
}
+/*
+ * 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
snprintf(command_sock_path, PATH_MAX,
KCONSUMERD_CMD_SOCK_PATH);
}
- kconsumerd_set_command_socket_path(command_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);
goto error;
}
- /* create the pipe to wake to polling thread when needed */
- ret = kconsumerd_create_poll_pipe();
- if (ret < 0) {
- perror("Error creating poll pipe");
- goto end;
- }
-
/* 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);
if (ret < 0) {
WARN("Cannot connect to error socket, is ltt-sessiond started ?");
}
- kconsumerd_set_error_socket(ret);
+ lttng_kconsumerd_set_error_sock(ctx, ret);
/* Create the thread to manage the receive of fd */
- ret = pthread_create(&threads[0], NULL, kconsumerd_thread_receive_fds,
- (void *) NULL);
+ 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, kconsumerd_thread_poll_fds,
- (void *) NULL);
+ ret = pthread_create(&threads[1], NULL, lttng_kconsumerd_thread_poll_fds,
+ (void *) ctx);
if (ret != 0) {
perror("pthread_create");
goto error;
}
}
ret = EXIT_SUCCESS;
- kconsumerd_send_error(KCONSUMERD_EXIT_SUCCESS);
+ lttng_kconsumerd_send_error(ctx, KCONSUMERD_EXIT_SUCCESS);
goto end;
error:
ret = EXIT_FAILURE;
- kconsumerd_send_error(KCONSUMERD_EXIT_FAILURE);
+ lttng_kconsumerd_send_error(ctx, KCONSUMERD_EXIT_FAILURE);
end:
- kconsumerd_cleanup();
+ lttng_kconsumerd_destroy(ctx);
+ lttng_kconsumerd_cleanup();
return ret;
}
projects / lttng-tools.git / blobdiff