--- /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 <assert.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <pthread.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <lttng-kernel-ctl.h>
+#include <lttng-sessiond-comm.h>
+#include <lttng/lttng-kconsumer.h>
+#include <lttngerr.h>
+
+extern struct lttng_consumer_global_data consumer_data;
+extern int consumer_poll_timeout;
+extern volatile int consumer_quit;
+
+/*
+ * Mmap the ring buffer, read it and write the data to the tracefile.
+ *
+ * Returns the number of bytes written
+ */
+int lttng_kconsumer_on_read_subbuffer_mmap(
+ struct lttng_consumer_local_data *ctx,
+ struct lttng_consumer_stream *stream, unsigned long len)
+{
+ unsigned long mmap_offset;
+ long ret = 0;
+ off_t orig_offset = stream->out_fd_offset;
+ int fd = stream->wait_fd;
+ int outfd = stream->out_fd;
+
+ /* get the offset inside the fd to mmap */
+ ret = kernctl_get_mmap_read_offset(fd, &mmap_offset);
+ if (ret != 0) {
+ ret = -errno;
+ perror("kernctl_get_mmap_read_offset");
+ goto end;
+ }
+
+ while (len > 0) {
+ ret = write(outfd, stream->mmap_base + mmap_offset, len);
+ if (ret >= len) {
+ len = 0;
+ } else if (ret < 0) {
+ ret = -errno;
+ perror("Error in file write");
+ goto end;
+ }
+ /* This won't block, but will start writeout asynchronously */
+ sync_file_range(outfd, stream->out_fd_offset, ret,
+ SYNC_FILE_RANGE_WRITE);
+ stream->out_fd_offset += ret;
+ }
+
+ lttng_consumer_sync_trace_file(stream, orig_offset);
+
+ goto end;
+
+end:
+ return ret;
+}
+
+/*
+ * Splice the data from the ring buffer to the tracefile.
+ *
+ * Returns the number of bytes spliced.
+ */
+int lttng_kconsumer_on_read_subbuffer_splice(
+ struct lttng_consumer_local_data *ctx,
+ struct lttng_consumer_stream *stream, unsigned long len)
+{
+ long ret = 0;
+ loff_t offset = 0;
+ off_t orig_offset = stream->out_fd_offset;
+ int fd = stream->wait_fd;
+ int outfd = stream->out_fd;
+
+ while (len > 0) {
+ DBG("splice chan to pipe offset %lu (fd : %d)",
+ (unsigned long)offset, fd);
+ ret = splice(fd, &offset, ctx->consumer_thread_pipe[1], NULL, len,
+ SPLICE_F_MOVE | SPLICE_F_MORE);
+ DBG("splice chan to pipe ret %ld", ret);
+ if (ret < 0) {
+ ret = errno;
+ perror("Error in relay splice");
+ goto splice_error;
+ }
+
+ ret = splice(ctx->consumer_thread_pipe[0], NULL, outfd, NULL, ret,
+ SPLICE_F_MOVE | SPLICE_F_MORE);
+ DBG("splice pipe to file %ld", ret);
+ if (ret < 0) {
+ ret = errno;
+ perror("Error in file splice");
+ goto splice_error;
+ }
+ len -= ret;
+ /* This won't block, but will start writeout asynchronously */
+ sync_file_range(outfd, stream->out_fd_offset, ret,
+ SYNC_FILE_RANGE_WRITE);
+ stream->out_fd_offset += ret;
+ }
+ lttng_consumer_sync_trace_file(stream, orig_offset);
+
+ goto end;
+
+splice_error:
+ /* send the appropriate error description to sessiond */
+ switch(ret) {
+ case EBADF:
+ lttng_consumer_send_error(ctx, CONSUMERD_SPLICE_EBADF);
+ break;
+ case EINVAL:
+ lttng_consumer_send_error(ctx, CONSUMERD_SPLICE_EINVAL);
+ break;
+ case ENOMEM:
+ lttng_consumer_send_error(ctx, CONSUMERD_SPLICE_ENOMEM);
+ break;
+ case ESPIPE:
+ lttng_consumer_send_error(ctx, CONSUMERD_SPLICE_ESPIPE);
+ break;
+ }
+
+end:
+ return ret;
+}
+
+/*
+ * Take a snapshot for a specific fd
+ *
+ * Returns 0 on success, < 0 on error
+ */
+int lttng_kconsumer_take_snapshot(struct lttng_consumer_local_data *ctx,
+ struct lttng_consumer_stream *stream)
+{
+ int ret = 0;
+ int infd = stream->wait_fd;
+
+ ret = kernctl_snapshot(infd);
+ if (ret != 0) {
+ ret = errno;
+ perror("Getting sub-buffer snapshot.");
+ }
+
+ return ret;
+}
+
+/*
+ * Get the produced position
+ *
+ * Returns 0 on success, < 0 on error
+ */
+int lttng_kconsumer_get_produced_snapshot(
+ struct lttng_consumer_local_data *ctx,
+ struct lttng_consumer_stream *stream,
+ unsigned long *pos)
+{
+ int ret;
+ int infd = stream->wait_fd;
+
+ ret = kernctl_snapshot_get_produced(infd, pos);
+ if (ret != 0) {
+ ret = errno;
+ perror("kernctl_snapshot_get_produced");
+ }
+
+ return ret;
+}
+
+int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
+ int sock, struct pollfd *consumer_sockpoll)
+{
+ ssize_t ret;
+ struct lttcomm_consumer_msg msg;
+
+ ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg));
+ if (ret != sizeof(msg)) {
+ lttng_consumer_send_error(ctx, CONSUMERD_ERROR_RECV_FD);
+ return ret;
+ }
+ if (msg.cmd_type == LTTNG_CONSUMER_STOP) {
+ return -ENOENT;
+ }
+
+ switch (msg.cmd_type) {
+ case LTTNG_CONSUMER_ADD_CHANNEL:
+ {
+ struct lttng_consumer_channel *new_channel;
+
+ DBG("consumer_add_channel %d", msg.u.channel.channel_key);
+ new_channel = consumer_allocate_channel(msg.u.channel.channel_key,
+ -1, -1,
+ msg.u.channel.mmap_len,
+ msg.u.channel.max_sb_size);
+ if (new_channel == NULL) {
+ lttng_consumer_send_error(ctx, CONSUMERD_OUTFD_ERROR);
+ goto end_nosignal;
+ }
+ if (ctx->on_recv_channel != NULL) {
+ ret = ctx->on_recv_channel(new_channel);
+ if (ret == 0) {
+ consumer_add_channel(new_channel);
+ } else if (ret < 0) {
+ goto end_nosignal;
+ }
+ } else {
+ consumer_add_channel(new_channel);
+ }
+ goto end_nosignal;
+ }
+ case LTTNG_CONSUMER_ADD_STREAM:
+ {
+ struct lttng_consumer_stream *new_stream;
+ int fds[1];
+ size_t nb_fd = 1;
+
+ /* block */
+ if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) {
+ return -EINTR;
+ }
+ ret = lttcomm_recv_fds_unix_sock(sock, fds, nb_fd);
+ if (ret != sizeof(fds)) {
+ lttng_consumer_send_error(ctx, CONSUMERD_ERROR_RECV_FD);
+ return ret;
+ }
+ if (nb_fd < 2)
+ fds[1] = fds[0]; /* duplicate same fd if recv only one */
+
+ DBG("consumer_add_stream %s (%d,%d)", msg.u.stream.path_name,
+ fds[0], fds[1]);
+ new_stream = consumer_allocate_stream(msg.u.stream.channel_key,
+ msg.u.stream.stream_key,
+ fds[0], fds[1],
+ msg.u.stream.state,
+ msg.u.stream.mmap_len,
+ msg.u.stream.output,
+ msg.u.stream.path_name);
+ if (new_stream == NULL) {
+ lttng_consumer_send_error(ctx, CONSUMERD_OUTFD_ERROR);
+ goto end;
+ }
+ if (ctx->on_recv_stream != NULL) {
+ ret = ctx->on_recv_stream(new_stream);
+ if (ret == 0) {
+ consumer_add_stream(new_stream);
+ } else if (ret < 0) {
+ goto end;
+ }
+ } else {
+ consumer_add_stream(new_stream);
+ }
+ break;
+ }
+ case LTTNG_CONSUMER_UPDATE_STREAM:
+ {
+ if (ctx->on_update_stream != NULL) {
+ ret = ctx->on_update_stream(msg.u.stream.stream_key, msg.u.stream.state);
+ if (ret == 0) {
+ consumer_change_stream_state(msg.u.stream.stream_key, msg.u.stream.state);
+ } else if (ret < 0) {
+ goto end;
+ }
+ } else {
+ consumer_change_stream_state(msg.u.stream.stream_key,
+ msg.u.stream.state);
+ }
+ break;
+ }
+ default:
+ break;
+ }
+end:
+ /* signal the poll thread */
+ ret = write(ctx->consumer_poll_pipe[1], "4", 1);
+ if (ret < 0) {
+ perror("write consumer poll");
+ }
+end_nosignal:
+ return 0;
+}
projects / lttng-tools.git / blobdiff