+++ /dev/null
-/*
- * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
- * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-#include <sys/socket.h>
-#include <sys/types.h>
-#include <netinet/in.h>
-#include <netdb.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <errno.h>
-#include <inttypes.h>
-#include <fcntl.h>
-#include <poll.h>
-
-#include <babeltrace/ctf/ctf-index.h>
-
-#include <babeltrace/babeltrace.h>
-#include <babeltrace/ctf/events.h>
-#include <babeltrace/ctf/callbacks.h>
-#include <babeltrace/ctf/iterator.h>
-
-/* for packet_index */
-#include <babeltrace/ctf/types.h>
-
-#include <babeltrace/ctf/metadata.h>
-#include <babeltrace/ctf-text/types.h>
-#include <babeltrace/ctf/events-internal.h>
-#include <formats/ctf/events-private.h>
-
-#include <babeltrace/endian.h>
-#include <babeltrace/compat/memstream.h>
-#include <babeltrace/compat/send.h>
-#include <babeltrace/compat/string.h>
-#include <babeltrace/compat/mman.h>
-#include <babeltrace/babeltrace-internal.h>
-
-#include "lttng-live.h"
-#include "lttng-viewer-abi.h"
-
-#define ACTIVE_POLL_DELAY 100 /* ms */
-
-static void ctf_live_packet_seek(struct bt_stream_pos *stream_pos,
- size_t index, int whence);
-static int add_traces(struct lttng_live_ctx *ctx);
-static int del_traces(gpointer key, gpointer value, gpointer user_data);
-static int get_new_metadata(struct lttng_live_ctx *ctx,
- struct lttng_live_viewer_stream *viewer_stream,
- char **metadata_buf);
-
-static
-ssize_t lttng_live_recv(int fd, void *buf, size_t len)
-{
- ssize_t ret;
- size_t copied = 0, to_copy = len;
-
- do {
- ret = recv(fd, buf + copied, to_copy, 0);
- if (ret > 0) {
- assert(ret <= to_copy);
- copied += ret;
- to_copy -= ret;
- }
- } while ((ret > 0 && to_copy > 0)
- || (ret < 0 && errno == EINTR));
- if (ret > 0)
- ret = copied;
- /* ret = 0 means orderly shutdown, ret < 0 is error. */
- return ret;
-}
-
-static
-ssize_t lttng_live_send(int fd, const void *buf, size_t len)
-{
- ssize_t ret;
-
- do {
- ret = bt_send_nosigpipe(fd, buf, len);
- } while (ret < 0 && errno == EINTR);
- return ret;
-}
-
-int lttng_live_connect_viewer(struct lttng_live_ctx *ctx)
-{
- struct hostent *host;
- struct sockaddr_in server_addr;
- int ret;
-
- if (lttng_live_should_quit()) {
- ret = -1;
- goto end;
- }
-
- host = gethostbyname(ctx->relay_hostname);
- if (!host) {
- fprintf(stderr, "[error] Cannot lookup hostname %s\n",
- ctx->relay_hostname);
- goto error;
- }
-
- if ((ctx->control_sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
- perror("Socket");
- goto error;
- }
-
- server_addr.sin_family = AF_INET;
- server_addr.sin_port = htons(ctx->port);
- server_addr.sin_addr = *((struct in_addr *) host->h_addr);
- memset(&(server_addr.sin_zero), 0, 8);
-
- if (connect(ctx->control_sock, (struct sockaddr *) &server_addr,
- sizeof(struct sockaddr)) == -1) {
- perror("Connect");
- goto error;
- }
-
- ret = 0;
-
-end:
- return ret;
-
-error:
- fprintf(stderr, "[error] Connection failed\n");
- return -1;
-}
-
-int lttng_live_establish_connection(struct lttng_live_ctx *ctx)
-{
- struct lttng_viewer_cmd cmd;
- struct lttng_viewer_connect connect;
- int ret;
- ssize_t ret_len;
-
- if (lttng_live_should_quit()) {
- ret = -1;
- goto end;
- }
-
- cmd.cmd = htobe32(LTTNG_VIEWER_CONNECT);
- cmd.data_size = htobe64((uint64_t) sizeof(connect));
- cmd.cmd_version = htobe32(0);
-
- connect.viewer_session_id = -1ULL; /* will be set on recv */
- connect.major = htobe32(LTTNG_LIVE_MAJOR);
- connect.minor = htobe32(LTTNG_LIVE_MINOR);
- connect.type = htobe32(LTTNG_VIEWER_CLIENT_COMMAND);
-
- ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
- if (ret_len < 0) {
- perror("[error] Error sending cmd");
- goto error;
- }
- assert(ret_len == sizeof(cmd));
-
- ret_len = lttng_live_send(ctx->control_sock, &connect, sizeof(connect));
- if (ret_len < 0) {
- perror("[error] Error sending version");
- goto error;
- }
- assert(ret_len == sizeof(connect));
-
- ret_len = lttng_live_recv(ctx->control_sock, &connect, sizeof(connect));
- if (ret_len == 0) {
- fprintf(stderr, "[error] Remote side has closed connection\n");
- goto error;
- }
- if (ret_len < 0) {
- perror("[error] Error receiving version");
- goto error;
- }
- assert(ret_len == sizeof(connect));
-
- printf_verbose("Received viewer session ID : %" PRIu64 "\n",
- be64toh(connect.viewer_session_id));
- printf_verbose("Relayd version : %u.%u\n", be32toh(connect.major),
- be32toh(connect.minor));
-
- if (LTTNG_LIVE_MAJOR != be32toh(connect.major)) {
- fprintf(stderr, "[error] Incompatible lttng-relayd protocol\n");
- goto error;
- }
- /* Use the smallest protocol version implemented. */
- if (LTTNG_LIVE_MINOR > be32toh(connect.minor)) {
- ctx->minor = be32toh(connect.minor);
- } else {
- ctx->minor = LTTNG_LIVE_MINOR;
- }
- ctx->major = LTTNG_LIVE_MAJOR;
- ret = 0;
-end:
- return ret;
-
-error:
- fprintf(stderr, "[error] Unable to establish connection\n");
- return -1;
-}
-
-static
-void free_session_list(GPtrArray *session_list)
-{
- int i;
- struct lttng_live_relay_session *relay_session;
-
- for (i = 0; i < session_list->len; i++) {
- relay_session = g_ptr_array_index(session_list, i);
- free(relay_session->name);
- free(relay_session->hostname);
- }
- g_ptr_array_free(session_list, TRUE);
-}
-
-static
-void print_session_list(GPtrArray *session_list, const char *path)
-{
- int i;
- struct lttng_live_relay_session *relay_session;
-
- for (i = 0; i < session_list->len; i++) {
- relay_session = g_ptr_array_index(session_list, i);
- fprintf(LTTNG_LIVE_OUTPUT_FP, "%s/host/%s/%s (timer = %u, "
- "%u stream(s), %u client(s) connected)\n",
- path, relay_session->hostname,
- relay_session->name, relay_session->timer,
- relay_session->streams, relay_session->clients);
- }
-}
-
-static
-void update_session_list(GPtrArray *session_list, char *hostname,
- char *session_name, uint32_t streams, uint32_t clients,
- uint32_t timer)
-{
- int i, found = 0;
- struct lttng_live_relay_session *relay_session;
-
- for (i = 0; i < session_list->len; i++) {
- relay_session = g_ptr_array_index(session_list, i);
- if ((strncmp(relay_session->hostname, hostname, MAXNAMLEN) == 0) &&
- strncmp(relay_session->name,
- session_name, MAXNAMLEN) == 0) {
- relay_session->streams += streams;
- if (relay_session->clients < clients)
- relay_session->clients = clients;
- found = 1;
- break;
- }
- }
- if (found)
- return;
-
- relay_session = g_new0(struct lttng_live_relay_session, 1);
- relay_session->hostname = bt_strndup(hostname, MAXNAMLEN);
- relay_session->name = bt_strndup(session_name, MAXNAMLEN);
- relay_session->clients = clients;
- relay_session->streams = streams;
- relay_session->timer = timer;
- g_ptr_array_add(session_list, relay_session);
-}
-
-int lttng_live_list_sessions(struct lttng_live_ctx *ctx, const char *path)
-{
- struct lttng_viewer_cmd cmd;
- struct lttng_viewer_list_sessions list;
- struct lttng_viewer_session lsession;
- int i, ret, sessions_count, print_list = 0;
- ssize_t ret_len;
- uint64_t session_id;
- GPtrArray *session_list = NULL;
-
- if (lttng_live_should_quit()) {
- ret = -1;
- goto end;
- }
-
- if (strlen(ctx->session_name) == 0) {
- print_list = 1;
- session_list = g_ptr_array_new();
- }
-
- cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS);
- cmd.data_size = htobe64((uint64_t) 0);
- cmd.cmd_version = htobe32(0);
-
- ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
- if (ret_len < 0) {
- perror("[error] Error sending cmd");
- goto error;
- }
- assert(ret_len == sizeof(cmd));
-
- ret_len = lttng_live_recv(ctx->control_sock, &list, sizeof(list));
- if (ret_len == 0) {
- fprintf(stderr, "[error] Remote side has closed connection\n");
- goto error;
- }
- if (ret_len < 0) {
- perror("[error] Error receiving session list");
- goto error;
- }
- assert(ret_len == sizeof(list));
-
- sessions_count = be32toh(list.sessions_count);
- for (i = 0; i < sessions_count; i++) {
- ret_len = lttng_live_recv(ctx->control_sock, &lsession, sizeof(lsession));
- if (ret_len == 0) {
- fprintf(stderr, "[error] Remote side has closed connection\n");
- goto error;
- }
- if (ret_len < 0) {
- perror("[error] Error receiving session");
- goto error;
- }
- assert(ret_len == sizeof(lsession));
- lsession.hostname[LTTNG_VIEWER_HOST_NAME_MAX - 1] = '\0';
- lsession.session_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
- session_id = be64toh(lsession.id);
-
- if (print_list) {
- update_session_list(session_list,
- lsession.hostname,
- lsession.session_name,
- be32toh(lsession.streams),
- be32toh(lsession.clients),
- be32toh(lsession.live_timer));
- } else {
- if ((strncmp(lsession.session_name, ctx->session_name,
- MAXNAMLEN) == 0) && (strncmp(lsession.hostname,
- ctx->traced_hostname, MAXNAMLEN) == 0)) {
- printf_verbose("Reading from session %" PRIu64 "\n",
- session_id);
- g_array_append_val(ctx->session_ids,
- session_id);
- }
- }
- }
-
- if (print_list) {
- print_session_list(session_list, path);
- free_session_list(session_list);
- }
- ret = 0;
-end:
- return ret;
-
-error:
- fprintf(stderr, "[error] Unable to list sessions\n");
- return -1;
-}
-
-int lttng_live_ctf_trace_assign(struct lttng_live_viewer_stream *stream,
- uint64_t ctf_trace_id)
-{
- struct lttng_live_ctf_trace *trace;
- int ret = 0;
-
- trace = g_hash_table_lookup(stream->session->ctf_traces,
- &ctf_trace_id);
- if (!trace) {
- trace = g_new0(struct lttng_live_ctf_trace, 1);
- trace->ctf_trace_id = ctf_trace_id;
- trace->streams = g_ptr_array_new();
- g_hash_table_insert(stream->session->ctf_traces,
- &trace->ctf_trace_id,
- trace);
- }
- if (stream->metadata_flag)
- trace->metadata_stream = stream;
-
- stream->ctf_trace = trace;
- g_ptr_array_add(trace->streams, stream);
-
- return ret;
-}
-
-static
-int open_metadata_fp_write(struct lttng_live_viewer_stream *stream,
- char **metadata_buf, size_t *size)
-{
- int ret = 0;
-
- stream->metadata_fp_write =
- bt_open_memstream(metadata_buf, size);
- if (!stream->metadata_fp_write) {
- perror("Metadata open_memstream");
- ret = -1;
- }
-
- return ret;
-}
-
-int lttng_live_attach_session(struct lttng_live_ctx *ctx, uint64_t id)
-{
- struct lttng_viewer_cmd cmd;
- struct lttng_viewer_attach_session_request rq;
- struct lttng_viewer_attach_session_response rp;
- struct lttng_viewer_stream stream;
- int ret, i;
- ssize_t ret_len;
-
- if (lttng_live_should_quit()) {
- ret = -1;
- goto end;
- }
-
- cmd.cmd = htobe32(LTTNG_VIEWER_ATTACH_SESSION);
- cmd.data_size = htobe64((uint64_t) sizeof(rq));
- cmd.cmd_version = htobe32(0);
-
- memset(&rq, 0, sizeof(rq));
- rq.session_id = htobe64(id);
- // TODO: add cmd line parameter to select seek beginning
- // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
- rq.seek = htobe32(LTTNG_VIEWER_SEEK_LAST);
-
- ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
- if (ret_len < 0) {
- perror("[error] Error sending cmd");
- goto error;
- }
- assert(ret_len == sizeof(cmd));
-
- ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
- if (ret_len < 0) {
- perror("[error] Error sending attach request");
- goto error;
- }
- assert(ret_len == sizeof(rq));
-
- ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
- if (ret_len == 0) {
- fprintf(stderr, "[error] Remote side has closed connection\n");
- goto error;
- }
- if (ret_len < 0) {
- perror("[error] Error receiving attach response");
- goto error;
- }
- assert(ret_len == sizeof(rp));
-
- switch(be32toh(rp.status)) {
- case LTTNG_VIEWER_ATTACH_OK:
- break;
- case LTTNG_VIEWER_ATTACH_UNK:
- ret = -LTTNG_VIEWER_ATTACH_UNK;
- goto end;
- case LTTNG_VIEWER_ATTACH_ALREADY:
- fprintf(stderr, "[error] There is already a viewer attached to this session\n");
- goto error;
- case LTTNG_VIEWER_ATTACH_NOT_LIVE:
- fprintf(stderr, "[error] Not a live session\n");
- goto error;
- case LTTNG_VIEWER_ATTACH_SEEK_ERR:
- fprintf(stderr, "[error] Wrong seek parameter\n");
- goto error;
- default:
- fprintf(stderr, "[error] Unknown attach return code %u\n",
- be32toh(rp.status));
- goto error;
- }
- if (be32toh(rp.status) != LTTNG_VIEWER_ATTACH_OK) {
- goto error;
- }
-
- ctx->session->stream_count += be32toh(rp.streams_count);
- /*
- * When the session is created but not started, we do an active wait
- * until it starts. It allows the viewer to start processing the trace
- * as soon as the session starts.
- */
- if (ctx->session->stream_count == 0) {
- ret = 0;
- goto end;
- }
- printf_verbose("Waiting for %" PRIu64 " streams:\n",
- ctx->session->stream_count);
- ctx->session->streams = g_new0(struct lttng_live_viewer_stream,
- ctx->session->stream_count);
- for (i = 0; i < be32toh(rp.streams_count); i++) {
- ret_len = lttng_live_recv(ctx->control_sock, &stream, sizeof(stream));
- if (ret_len == 0) {
- fprintf(stderr, "[error] Remote side has closed connection\n");
- goto error;
- }
- if (ret_len < 0) {
- perror("[error] Error receiving stream");
- goto error;
- }
- assert(ret_len == sizeof(stream));
- stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0';
- stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
-
- printf_verbose(" stream %" PRIu64 " : %s/%s\n",
- be64toh(stream.id), stream.path_name,
- stream.channel_name);
- ctx->session->streams[i].id = be64toh(stream.id);
- ctx->session->streams[i].session = ctx->session;
-
- ctx->session->streams[i].mmap_size = 0;
- ctx->session->streams[i].ctf_stream_id = -1ULL;
-
- if (be32toh(stream.metadata_flag)) {
- ctx->session->streams[i].metadata_flag = 1;
- }
- ret = lttng_live_ctf_trace_assign(&ctx->session->streams[i],
- be64toh(stream.ctf_trace_id));
- if (ret < 0) {
- goto error;
- }
-
- }
- ret = 0;
-end:
- return ret;
-
-error:
- return -1;
-}
-
-/*
- * Ask the relay for new streams.
- *
- * Returns the number of new streams received or a negative value on error.
- */
-static
-int ask_new_streams(struct lttng_live_ctx *ctx)
-{
- int i, ret = 0, nb_streams = 0;
- uint64_t id;
-
-restart:
- for (i = 0; i < ctx->session_ids->len; i++) {
- id = g_array_index(ctx->session_ids, uint64_t, i);
- ret = lttng_live_get_new_streams(ctx, id);
- printf_verbose("Asking for new streams returns %d\n", ret);
- if (ret < 0) {
- if (lttng_live_should_quit()) {
- goto end;
- }
- if (ret == -LTTNG_VIEWER_NEW_STREAMS_HUP) {
- printf_verbose("Session %" PRIu64 " closed\n",
- id);
- /*
- * The streams have already been closed during
- * the reading, so we only need to get rid of
- * the trace in our internal table of sessions.
- */
- g_array_remove_index(ctx->session_ids, i);
- /*
- * We can't continue iterating on the g_array
- * after a remove, we have to start again.
- */
- goto restart;
- } else {
- ret = -1;
- goto end;
- }
- } else {
- nb_streams += ret;
- }
- }
- ret = nb_streams;
-
-end:
- return ret;
-}
-
-static
-int append_metadata(struct lttng_live_ctx *ctx,
- struct lttng_live_viewer_stream *viewer_stream)
-{
- int ret;
- struct lttng_live_viewer_stream *metadata;
- char *metadata_buf = NULL;
-
- printf_verbose("get_next_index: new metadata needed\n");
- ret = get_new_metadata(ctx, viewer_stream, &metadata_buf);
- if (ret < 0) {
- free(metadata_buf);
- goto error;
- }
-
- metadata = viewer_stream->ctf_trace->metadata_stream;
- metadata->ctf_trace->metadata_fp =
- bt_fmemopen(metadata_buf,
- metadata->metadata_len, "rb");
- if (!metadata->ctf_trace->metadata_fp) {
- perror("Metadata fmemopen");
- free(metadata_buf);
- ret = -1;
- goto error;
- }
- ret = ctf_append_trace_metadata(
- viewer_stream->ctf_trace->handle->td,
- metadata->ctf_trace->metadata_fp);
- /* We accept empty metadata packets */
- if (ret != 0 && ret != -ENOENT) {
- fprintf(stderr, "[error] Appending metadata\n");
- goto error;
- }
- ret = 0;
-
-error:
- return ret;
-}
-
-static
-int get_data_packet(struct lttng_live_ctx *ctx,
- struct ctf_stream_pos *pos,
- struct lttng_live_viewer_stream *stream, uint64_t offset,
- uint64_t len)
-{
- struct lttng_viewer_cmd cmd;
- struct lttng_viewer_get_packet rq;
- struct lttng_viewer_trace_packet rp;
- ssize_t ret_len;
- int ret;
-
-retry:
- if (lttng_live_should_quit()) {
- ret = -1;
- goto end;
- }
-
- cmd.cmd = htobe32(LTTNG_VIEWER_GET_PACKET);
- cmd.data_size = htobe64((uint64_t) sizeof(rq));
- cmd.cmd_version = htobe32(0);
-
- memset(&rq, 0, sizeof(rq));
- rq.stream_id = htobe64(stream->id);
- rq.offset = htobe64(offset);
- rq.len = htobe32(len);
-
- ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
- if (ret_len < 0) {
- perror("[error] Error sending cmd");
- goto error;
- }
- assert(ret_len == sizeof(cmd));
-
- ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
- if (ret_len < 0) {
- perror("[error] Error sending get_data_packet request");
- goto error;
- }
- assert(ret_len == sizeof(rq));
-
- ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
- if (ret_len == 0) {
- fprintf(stderr, "[error] Remote side has closed connection\n");
- goto error;
- }
- if (ret_len < 0) {
- perror("[error] Error receiving data response");
- goto error;
- }
- if (ret_len != sizeof(rp)) {
- fprintf(stderr, "[error] get_data_packet: expected %zu"
- ", received %zd\n", sizeof(rp),
- ret_len);
- goto error;
- }
-
- rp.flags = be32toh(rp.flags);
-
- switch (be32toh(rp.status)) {
- case LTTNG_VIEWER_GET_PACKET_OK:
- len = be32toh(rp.len);
- printf_verbose("get_data_packet: Ok, packet size : %" PRIu64
- "\n", len);
- break;
- case LTTNG_VIEWER_GET_PACKET_RETRY:
- /* Unimplemented by relay daemon */
- printf_verbose("get_data_packet: retry\n");
- goto error;
- case LTTNG_VIEWER_GET_PACKET_ERR:
- if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
- printf_verbose("get_data_packet: new metadata needed\n");
- ret = append_metadata(ctx, stream);
- if (ret)
- goto error;
- }
- if (rp.flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
- printf_verbose("get_data_packet: new streams needed\n");
- ret = ask_new_streams(ctx);
- if (ret < 0) {
- goto error;
- } else if (ret > 0) {
- ret = add_traces(ctx);
- if (ret < 0) {
- goto error;
- }
- }
- }
- if (rp.flags & (LTTNG_VIEWER_FLAG_NEW_METADATA
- | LTTNG_VIEWER_FLAG_NEW_STREAM)) {
- goto retry;
- }
- fprintf(stderr, "[error] get_data_packet: error\n");
- goto error;
- case LTTNG_VIEWER_GET_PACKET_EOF:
- ret = -2;
- goto end;
- default:
- printf_verbose("get_data_packet: unknown\n");
- goto error;
- }
-
- if (len == 0) {
- goto error;
- }
-
- if (len > stream->mmap_size) {
- uint64_t new_size;
-
- new_size = max_t(uint64_t, len, stream->mmap_size << 1);
- if (pos->base_mma) {
- /* unmap old base */
- ret = munmap_align(pos->base_mma);
- if (ret) {
- perror("[error] Unable to unmap old base");
- goto error;
- }
- pos->base_mma = NULL;
- }
- pos->base_mma = mmap_align(new_size,
- PROT_READ | PROT_WRITE,
- MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
- if (pos->base_mma == MAP_FAILED) {
- perror("[error] mmap error");
- pos->base_mma = NULL;
- goto error;
- }
-
- stream->mmap_size = new_size;
- printf_verbose("Expanding stream mmap size to %" PRIu64 " bytes\n",
- stream->mmap_size);
- }
-
- ret_len = lttng_live_recv(ctx->control_sock,
- mmap_align_addr(pos->base_mma), len);
- if (ret_len == 0) {
- fprintf(stderr, "[error] Remote side has closed connection\n");
- goto error;
- }
- if (ret_len < 0) {
- perror("[error] Error receiving trace packet");
- goto error;
- }
- assert(ret_len == len);
- ret = 0;
-end:
- return ret;
-
-error:
- return -1;
-}
-
-static
-int get_one_metadata_packet(struct lttng_live_ctx *ctx,
- struct lttng_live_viewer_stream *metadata_stream)
-{
- uint64_t len = 0;
- int ret;
- struct lttng_viewer_cmd cmd;
- struct lttng_viewer_get_metadata rq;
- struct lttng_viewer_metadata_packet rp;
- char *data = NULL;
- ssize_t ret_len;
-
- if (lttng_live_should_quit()) {
- ret = -1;
- goto end;
- }
-
- rq.stream_id = htobe64(metadata_stream->id);
- cmd.cmd = htobe32(LTTNG_VIEWER_GET_METADATA);
- cmd.data_size = htobe64((uint64_t) sizeof(rq));
- cmd.cmd_version = htobe32(0);
-
- ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
- if (ret_len < 0) {
- perror("[error] Error sending cmd");
- goto error;
- }
- assert(ret_len == sizeof(cmd));
-
- ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
- if (ret_len < 0) {
- perror("[error] Error sending get_metadata request");
- goto error;
- }
- assert(ret_len == sizeof(rq));
-
- ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
- if (ret_len == 0) {
- fprintf(stderr, "[error] Remote side has closed connection\n");
- goto error;
- }
- if (ret_len < 0) {
- perror("[error] Error receiving metadata response");
- goto error;
- }
- assert(ret_len == sizeof(rp));
-
- switch (be32toh(rp.status)) {
- case LTTNG_VIEWER_METADATA_OK:
- printf_verbose("get_metadata : OK\n");
- break;
- case LTTNG_VIEWER_NO_NEW_METADATA:
- printf_verbose("get_metadata : NO NEW\n");
- ret = 0;
- goto end;
- case LTTNG_VIEWER_METADATA_ERR:
- printf_verbose("get_metadata : ERR\n");
- goto error;
- default:
- printf_verbose("get_metadata : UNKNOWN\n");
- goto error;
- }
-
- len = be64toh(rp.len);
- printf_verbose("Writing %" PRIu64" bytes to metadata\n", len);
- if (len <= 0) {
- goto error;
- }
-
- data = zmalloc(len);
- if (!data) {
- perror("relay data zmalloc");
- goto error;
- }
- ret_len = lttng_live_recv(ctx->control_sock, data, len);
- if (ret_len == 0) {
- fprintf(stderr, "[error] Remote side has closed connection\n");
- goto error_free_data;
- }
- if (ret_len < 0) {
- perror("[error] Error receiving trace packet");
- goto error_free_data;
- }
- assert(ret_len == len);
-
- do {
- ret_len = fwrite(data, 1, len,
- metadata_stream->metadata_fp_write);
- } while (ret_len < 0 && errno == EINTR);
- if (ret_len < 0) {
- fprintf(stderr, "[error] Writing in the metadata fp\n");
- goto error_free_data;
- }
- assert(ret_len == len);
- metadata_stream->metadata_len += len;
- free(data);
- ret = len;
-end:
- return ret;
-
-error_free_data:
- free(data);
-error:
- return -1;
-}
-
-/*
- * Return 0 on success, a negative value on error.
- */
-static
-int get_new_metadata(struct lttng_live_ctx *ctx,
- struct lttng_live_viewer_stream *viewer_stream,
- char **metadata_buf)
-{
- int ret = 0;
- struct lttng_live_viewer_stream *metadata_stream;
- size_t size, len_read = 0;
-
- metadata_stream = viewer_stream->ctf_trace->metadata_stream;
- if (!metadata_stream) {
- fprintf(stderr, "[error] No metadata stream\n");
- ret = -1;
- goto error;
- }
- metadata_stream->metadata_len = 0;
- ret = open_metadata_fp_write(metadata_stream, metadata_buf, &size);
- if (ret < 0) {
- goto error;
- }
-
- do {
- if (lttng_live_should_quit()) {
- ret = -1;
- goto error;
- }
- /*
- * get_one_metadata_packet returns the number of bytes
- * received, 0 when we have received everything, a
- * negative value on error.
- */
- ret = get_one_metadata_packet(ctx, metadata_stream);
- if (ret > 0) {
- len_read += ret;
- }
- if (!len_read) {
- (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
- }
- } while (ret > 0 || !len_read);
-
- if (bt_close_memstream(metadata_buf, &size,
- metadata_stream->metadata_fp_write)) {
- perror("bt_close_memstream");
- }
- metadata_stream->metadata_fp_write = NULL;
-
-error:
- return ret;
-}
-
-/*
- * Assign the fields from a lttng_viewer_index to a packet_index.
- */
-static
-void lttng_index_to_packet_index(struct lttng_viewer_index *lindex,
- struct packet_index *pindex)
-{
- assert(lindex);
- assert(pindex);
-
- pindex->offset = be64toh(lindex->offset);
- pindex->packet_size = be64toh(lindex->packet_size);
- pindex->content_size = be64toh(lindex->content_size);
- pindex->ts_cycles.timestamp_begin = be64toh(lindex->timestamp_begin);
- pindex->ts_cycles.timestamp_end = be64toh(lindex->timestamp_end);
- pindex->events_discarded = be64toh(lindex->events_discarded);
-}
-
-/*
- * Get one index for a stream.
- *
- * Returns 0 on success or a negative value on error.
- */
-static
-int get_next_index(struct lttng_live_ctx *ctx,
- struct lttng_live_viewer_stream *viewer_stream,
- struct packet_index *index, uint64_t *stream_id)
-{
- struct lttng_viewer_cmd cmd;
- struct lttng_viewer_get_next_index rq;
- int ret;
- ssize_t ret_len;
- struct lttng_viewer_index *rp = &viewer_stream->current_index;
-
- cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEXT_INDEX);
- cmd.data_size = htobe64((uint64_t) sizeof(rq));
- cmd.cmd_version = htobe32(0);
-
- memset(&rq, 0, sizeof(rq));
- rq.stream_id = htobe64(viewer_stream->id);
-
-retry:
- if (lttng_live_should_quit()) {
- ret = -1;
- goto end;
- }
- ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
- if (ret_len < 0) {
- perror("[error] Error sending cmd");
- goto error;
- }
- assert(ret_len == sizeof(cmd));
-
- ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
- if (ret_len < 0) {
- perror("[error] Error sending get_next_index request");
- goto error;
- }
- assert(ret_len == sizeof(rq));
-
- ret_len = lttng_live_recv(ctx->control_sock, rp, sizeof(*rp));
- if (ret_len == 0) {
- fprintf(stderr, "[error] Remote side has closed connection\n");
- goto error;
- }
- if (ret_len < 0) {
- perror("[error] Error receiving index response");
- goto error;
- }
- assert(ret_len == sizeof(*rp));
-
- rp->flags = be32toh(rp->flags);
-
- switch (be32toh(rp->status)) {
- case LTTNG_VIEWER_INDEX_INACTIVE:
- printf_verbose("get_next_index: inactive\n");
- memset(index, 0, sizeof(struct packet_index));
- index->ts_cycles.timestamp_end = be64toh(rp->timestamp_end);
- *stream_id = be64toh(rp->stream_id);
- break;
- case LTTNG_VIEWER_INDEX_OK:
- printf_verbose("get_next_index: Ok, need metadata update : %u\n",
- rp->flags & LTTNG_VIEWER_FLAG_NEW_METADATA);
- lttng_index_to_packet_index(rp, index);
- *stream_id = be64toh(rp->stream_id);
- viewer_stream->data_pending = 1;
-
- if (rp->flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
- ret = append_metadata(ctx, viewer_stream);
- if (ret)
- goto error;
- }
- if (rp->flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
- printf_verbose("get_next_index: need new streams\n");
- ret = ask_new_streams(ctx);
- if (ret < 0) {
- goto error;
- } else if (ret > 0) {
- ret = add_traces(ctx);
- if (ret < 0) {
- goto error;
- }
- }
- }
- break;
- case LTTNG_VIEWER_INDEX_RETRY:
- printf_verbose("get_next_index: retry\n");
- (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
- goto retry;
- case LTTNG_VIEWER_INDEX_HUP:
- printf_verbose("get_next_index: stream hung up\n");
- viewer_stream->id = -1ULL;
- index->offset = EOF;
- ctx->session->stream_count--;
- break;
- case LTTNG_VIEWER_INDEX_ERR:
- fprintf(stderr, "[error] get_next_index: error\n");
- goto error;
- default:
- fprintf(stderr, "[error] get_next_index: unkwown value\n");
- goto error;
- }
- ret = 0;
-end:
- return ret;
-
-error:
- return -1;
-}
-
-static
-void read_packet_header(struct ctf_stream_pos *pos,
- struct ctf_file_stream *file_stream)
-{
- int ret;
-
- /* update trace_packet_header and stream_packet_context */
- if (!(pos->prot & PROT_WRITE) &&
- file_stream->parent.trace_packet_header) {
- /* Read packet header */
- ret = generic_rw(&pos->parent,
- &file_stream->parent.trace_packet_header->p);
- if (ret) {
- pos->offset = EOF;
- fprintf(stderr, "[error] trace packet "
- "header read failed\n");
- goto end;
- }
- }
- if (!(pos->prot & PROT_WRITE) &&
- file_stream->parent.stream_packet_context) {
- /* Read packet context */
- ret = generic_rw(&pos->parent,
- &file_stream->parent.stream_packet_context->p);
- if (ret) {
- pos->offset = EOF;
- fprintf(stderr, "[error] stream packet "
- "context read failed\n");
- goto end;
- }
- }
- pos->data_offset = pos->offset;
-
-end:
- return;
-}
-
-/*
- * Handle the seek parameters.
- * Returns 0 if the packet_seek can continue, a positive value to
- * cleanly exit the packet_seek, a negative value on error.
- */
-static
-int handle_seek_position(size_t index, int whence,
- struct lttng_live_viewer_stream *viewer_stream,
- struct ctf_stream_pos *pos,
- struct ctf_file_stream *file_stream)
-{
- int ret = 0;
-
- switch (whence) {
- case SEEK_CUR:
- ret = 0;
- goto end;
- case SEEK_SET:
- /*
- * We only allow to seek to 0.
- */
- if (index != 0) {
- fprintf(stderr, "[error] Arbitrary seek in lttng-live "
- "trace not supported\n");
- pos->offset = EOF;
- ret = -1;
- goto end;
- }
-
- ret = 0;
- goto end;
-
- default:
- fprintf(stderr, "[error] Invalid seek parameter\n");
- assert(0);
- }
-
-end:
- return ret;
-}
-
-static
-void ctf_live_packet_seek(struct bt_stream_pos *stream_pos, size_t index,
- int whence)
-{
- struct ctf_stream_pos *pos;
- struct ctf_file_stream *file_stream;
- struct packet_index *prev_index = NULL, *cur_index;
- struct lttng_live_viewer_stream *viewer_stream;
- struct lttng_live_session *session;
- uint64_t stream_id = -1ULL;
- int ret;
-
- pos = ctf_pos(stream_pos);
- file_stream = container_of(pos, struct ctf_file_stream, pos);
- viewer_stream = (struct lttng_live_viewer_stream *) pos->priv;
- session = viewer_stream->session;
-
- ret = handle_seek_position(index, whence, viewer_stream, pos,
- file_stream);
- if (ret != 0) {
- return;
- }
-
-retry:
- switch (pos->packet_index->len) {
- case 0:
- g_array_set_size(pos->packet_index, 1);
- cur_index = &g_array_index(pos->packet_index,
- struct packet_index, 0);
- break;
- case 1:
- g_array_set_size(pos->packet_index, 2);
- prev_index = &g_array_index(pos->packet_index,
- struct packet_index, 0);
- cur_index = &g_array_index(pos->packet_index,
- struct packet_index, 1);
- break;
- case 2:
- g_array_index(pos->packet_index,
- struct packet_index, 0) =
- g_array_index(pos->packet_index,
- struct packet_index, 1);
- prev_index = &g_array_index(pos->packet_index,
- struct packet_index, 0);
- cur_index = &g_array_index(pos->packet_index,
- struct packet_index, 1);
- break;
- default:
- abort();
- break;
- }
-
- if (viewer_stream->data_pending) {
- lttng_index_to_packet_index(&viewer_stream->current_index, cur_index);
- } else {
- printf_verbose("get_next_index for stream %" PRIu64 "\n", viewer_stream->id);
- ret = get_next_index(session->ctx, viewer_stream, cur_index, &stream_id);
- if (ret < 0) {
- pos->offset = EOF;
- if (!lttng_live_should_quit()) {
- fprintf(stderr, "[error] get_next_index failed\n");
- }
- return;
- }
- printf_verbose("Index received : packet_size : %" PRIu64
- ", offset %" PRIu64 ", content_size %" PRIu64
- ", timestamp_end : %" PRIu64 "\n",
- cur_index->packet_size, cur_index->offset,
- cur_index->content_size,
- cur_index->ts_cycles.timestamp_end);
-
- }
-
- /*
- * On the first time we receive an index, the stream_id needs to
- * be set for the stream in order to use it, we don't want any
- * data at this stage.
- */
- if (file_stream->parent.stream_id == -1ULL) {
- /*
- * Warning: with lttng-tools < 2.4.2, the beacon does not
- * contain the real stream ID, it is memset to 0, so this
- * might create a problem when a session has multiple
- * channels. We can't detect it at this stage, lttng-tools
- * has to be upgraded to fix this problem.
- */
- printf_verbose("Assigning stream_id %" PRIu64 "\n",
- stream_id);
- file_stream->parent.stream_id = stream_id;
- viewer_stream->ctf_stream_id = stream_id;
-
- return;
- }
-
- pos->packet_size = cur_index->packet_size;
- pos->content_size = cur_index->content_size;
- pos->mmap_base_offset = 0;
- if (cur_index->offset == EOF) {
- pos->offset = EOF;
- } else {
- pos->offset = 0;
- }
-
- if (cur_index->content_size == 0) {
- if (file_stream->parent.stream_class) {
- file_stream->parent.cycles_timestamp =
- cur_index->ts_cycles.timestamp_end;
- file_stream->parent.real_timestamp = ctf_get_real_timestamp(
- &file_stream->parent,
- cur_index->ts_cycles.timestamp_end);
- }
- } else {
- if (file_stream->parent.stream_class) {
- /* Convert the timestamps and append to the real_index. */
- cur_index->ts_real.timestamp_begin = ctf_get_real_timestamp(
- &file_stream->parent,
- cur_index->ts_cycles.timestamp_begin);
- cur_index->ts_real.timestamp_end = ctf_get_real_timestamp(
- &file_stream->parent,
- cur_index->ts_cycles.timestamp_end);
- }
-
- ctf_update_current_packet_index(&file_stream->parent,
- prev_index, cur_index);
-
- file_stream->parent.cycles_timestamp =
- cur_index->ts_cycles.timestamp_begin;
- file_stream->parent.real_timestamp =
- cur_index->ts_real.timestamp_begin;
- }
-
- /*
- * Flush the output between attempts to grab a packet, thus
- * ensuring we flush at least at the periodical timer period.
- * This ensures the output remains reactive for interactive users and
- * that the output is flushed when redirected to a file by the shell.
- */
- if (fflush(LTTNG_LIVE_OUTPUT_FP) < 0) {
- perror("fflush");
- goto end;
- }
-
- if (pos->packet_size == 0 || pos->offset == EOF) {
- goto end;
- }
-
- printf_verbose("get_data_packet for stream %" PRIu64 "\n",
- viewer_stream->id);
- ret = get_data_packet(session->ctx, pos, viewer_stream,
- cur_index->offset,
- cur_index->packet_size / CHAR_BIT);
- if (ret == -2) {
- goto retry;
- } else if (ret < 0) {
- pos->offset = EOF;
- if (!lttng_live_should_quit()) {
- fprintf(stderr, "[error] get_data_packet failed\n");
- }
- return;
- }
- viewer_stream->data_pending = 0;
-
- read_packet_header(pos, file_stream);
-
-end:
- return;
-}
-
-int lttng_live_create_viewer_session(struct lttng_live_ctx *ctx)
-{
- struct lttng_viewer_cmd cmd;
- struct lttng_viewer_create_session_response resp;
- int ret;
- ssize_t ret_len;
-
- if (lttng_live_should_quit()) {
- ret = -1;
- goto end;
- }
-
- cmd.cmd = htobe32(LTTNG_VIEWER_CREATE_SESSION);
- cmd.data_size = htobe64((uint64_t) 0);
- cmd.cmd_version = htobe32(0);
-
- ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
- if (ret_len < 0) {
- perror("[error] Error sending cmd");
- goto error;
- }
- assert(ret_len == sizeof(cmd));
-
- ret_len = lttng_live_recv(ctx->control_sock, &resp, sizeof(resp));
- if (ret_len == 0) {
- fprintf(stderr, "[error] Remote side has closed connection\n");
- goto error;
- }
- if (ret_len < 0) {
- perror("[error] Error receiving create session reply");
- goto error;
- }
- assert(ret_len == sizeof(resp));
-
- if (be32toh(resp.status) != LTTNG_VIEWER_CREATE_SESSION_OK) {
- fprintf(stderr, "[error] Error creating viewer session\n");
- goto error;
- }
- ret = 0;
-end:
- return ret;
-
-error:
- return -1;
-}
-
-static
-int del_traces(gpointer key, gpointer value, gpointer user_data)
-{
- struct bt_context *bt_ctx = user_data;
- struct lttng_live_ctf_trace *trace = value;
- int ret;
-
- ret = bt_context_remove_trace(bt_ctx, trace->trace_id);
- if (ret < 0)
- fprintf(stderr, "[error] removing trace from context\n");
-
- /* remove the key/value pair from the HT. */
- return 1;
-}
-
-static
-int add_one_trace(struct lttng_live_ctx *ctx,
- struct lttng_live_ctf_trace *trace)
-{
- int i, ret;
- struct bt_context *bt_ctx = ctx->bt_ctx;
- struct lttng_live_viewer_stream *stream;
- struct bt_mmap_stream *new_mmap_stream;
- struct bt_mmap_stream_list mmap_list;
- struct bt_trace_descriptor *td;
- struct bt_trace_handle *handle;
-
- /*
- * We don't know how many streams we will receive for a trace, so
- * once we are done receiving the traces, we add all the traces
- * received to the bt_context.
- * We can receive streams during the attach command or the
- * get_new_streams, so we have to make sure not to add multiple
- * times the same traces.
- * If a trace is already in the context, we just skip this function.
- */
- if (trace->in_use) {
- ret = 0;
- goto end;
- }
-
- BT_INIT_LIST_HEAD(&mmap_list.head);
-
- for (i = 0; i < trace->streams->len; i++) {
- stream = g_ptr_array_index(trace->streams, i);
-
- if (!stream->metadata_flag) {
- new_mmap_stream = zmalloc(sizeof(struct bt_mmap_stream));
- new_mmap_stream->priv = (void *) stream;
- new_mmap_stream->fd = -1;
- bt_list_add(&new_mmap_stream->list, &mmap_list.head);
- } else {
- char *metadata_buf = NULL;
-
- /* Get all possible metadata before starting */
- ret = get_new_metadata(ctx, stream, &metadata_buf);
- if (ret) {
- free(metadata_buf);
- goto end_free;
- }
- if (!stream->metadata_len) {
- fprintf(stderr, "[error] empty metadata\n");
- ret = -1;
- free(metadata_buf);
- goto end_free;
- }
-
- trace->metadata_fp = bt_fmemopen(metadata_buf,
- stream->metadata_len, "rb");
- if (!trace->metadata_fp) {
- perror("Metadata fmemopen");
- ret = -1;
- free(metadata_buf);
- goto end_free;
- }
- }
- }
-
- if (!trace->metadata_fp) {
- fprintf(stderr, "[error] No metadata stream opened\n");
- ret = -1;
- goto end_free;
- }
-
- ret = bt_context_add_trace(bt_ctx, NULL, "ctf",
- ctf_live_packet_seek, &mmap_list, trace->metadata_fp);
- if (ret < 0) {
- fprintf(stderr, "[error] Error adding trace\n");
- ret = -1;
- goto end_free;
- }
- trace->metadata_stream->metadata_len = 0;
-
- handle = (struct bt_trace_handle *) g_hash_table_lookup(
- bt_ctx->trace_handles,
- (gpointer) (unsigned long) ret);
- td = handle->td;
- trace->handle = handle;
- if (bt_ctx->current_iterator) {
- bt_iter_add_trace(bt_ctx->current_iterator, td);
- }
-
- trace->trace_id = ret;
- trace->in_use = 1;
-
- goto end;
-
-end_free:
- bt_context_put(bt_ctx);
-end:
- return ret;
-}
-
-static
-int add_traces(struct lttng_live_ctx *ctx)
-{
- int ret;
- struct lttng_live_ctf_trace *trace;
- GHashTableIter it;
- gpointer key;
- gpointer value;
-
- g_hash_table_iter_init(&it, ctx->session->ctf_traces);
- while (g_hash_table_iter_next(&it, &key, &value)) {
- trace = (struct lttng_live_ctf_trace *) value;
- ret = add_one_trace(ctx, trace);
- if (ret < 0) {
- goto end;
- }
- }
-
- ret = 0;
-
-end:
- return ret;
-}
-
-/*
- * Request new streams for a session.
- * Returns the number of streams received or a negative value on error.
- */
-int lttng_live_get_new_streams(struct lttng_live_ctx *ctx, uint64_t id)
-{
- struct lttng_viewer_cmd cmd;
- struct lttng_viewer_new_streams_request rq;
- struct lttng_viewer_new_streams_response rp;
- struct lttng_viewer_stream stream;
- int ret, i, nb_streams = 0;
- ssize_t ret_len;
- uint32_t stream_count;
-
- if (lttng_live_should_quit()) {
- ret = -1;
- goto end;
- }
-
- cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEW_STREAMS);
- cmd.data_size = htobe64((uint64_t) sizeof(rq));
- cmd.cmd_version = htobe32(0);
-
- memset(&rq, 0, sizeof(rq));
- rq.session_id = htobe64(id);
-
- ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
- if (ret_len < 0) {
- perror("[error] Error sending cmd");
- goto error;
- }
- assert(ret_len == sizeof(cmd));
-
- ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
- if (ret_len < 0) {
- perror("[error] Error sending get_new_streams request");
- goto error;
- }
- assert(ret_len == sizeof(rq));
-
- ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
- if (ret_len == 0) {
- fprintf(stderr, "[error] Remote side has closed connection\n");
- goto error;
- }
- if (ret_len < 0) {
- perror("[error] Error receiving get_new_streams response");
- goto error;
- }
- assert(ret_len == sizeof(rp));
-
- switch(be32toh(rp.status)) {
- case LTTNG_VIEWER_NEW_STREAMS_OK:
- break;
- case LTTNG_VIEWER_NEW_STREAMS_NO_NEW:
- ret = 0;
- goto end;
- case LTTNG_VIEWER_NEW_STREAMS_HUP:
- ret = -LTTNG_VIEWER_NEW_STREAMS_HUP;
- goto end;
- case LTTNG_VIEWER_NEW_STREAMS_ERR:
- fprintf(stderr, "[error] get_new_streams error\n");
- goto error;
- default:
- fprintf(stderr, "[error] Unknown return code %u\n",
- be32toh(rp.status));
- goto error;
- }
-
- stream_count = be32toh(rp.streams_count);
- ctx->session->stream_count += stream_count;
- /*
- * When the session is created but not started, we do an active wait
- * until it starts. It allows the viewer to start processing the trace
- * as soon as the session starts.
- */
- if (ctx->session->stream_count == 0) {
- ret = 0;
- goto end;
- }
- printf_verbose("Waiting for %" PRIu64 " streams:\n",
- ctx->session->stream_count);
- ctx->session->streams = g_new0(struct lttng_live_viewer_stream,
- ctx->session->stream_count);
- for (i = 0; i < stream_count; i++) {
- ret_len = lttng_live_recv(ctx->control_sock, &stream, sizeof(stream));
- if (ret_len == 0) {
- fprintf(stderr, "[error] Remote side has closed connection\n");
- goto error;
- }
- if (ret_len < 0) {
- perror("[error] Error receiving stream");
- goto error;
- }
- assert(ret_len == sizeof(stream));
- stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0';
- stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
-
- printf_verbose(" stream %" PRIu64 " : %s/%s\n",
- be64toh(stream.id), stream.path_name,
- stream.channel_name);
- ctx->session->streams[i].id = be64toh(stream.id);
- ctx->session->streams[i].session = ctx->session;
-
- ctx->session->streams[i].mmap_size = 0;
- ctx->session->streams[i].ctf_stream_id = -1ULL;
-
- if (be32toh(stream.metadata_flag)) {
- ctx->session->streams[i].metadata_flag = 1;
- }
- ret = lttng_live_ctf_trace_assign(&ctx->session->streams[i],
- be64toh(stream.ctf_trace_id));
- if (ret < 0) {
- goto error;
- }
- nb_streams++;
-
- }
- ret = nb_streams;
-end:
- return ret;
-
-error:
- return -1;
-}
-
-int lttng_live_read(struct lttng_live_ctx *ctx)
-{
- int ret = -1;
- int i;
- struct bt_ctf_iter *iter;
- const struct bt_ctf_event *event;
- struct bt_iter_pos begin_pos;
- struct bt_trace_descriptor *td_write;
- struct bt_format *fmt_write;
- struct ctf_text_stream_pos *sout;
- uint64_t id;
-
- ctx->bt_ctx = bt_context_create();
- if (!ctx->bt_ctx) {
- fprintf(stderr, "[error] bt_context_create allocation\n");
- goto end;
- }
-
- fmt_write = bt_lookup_format(g_quark_from_string("text"));
- if (!fmt_write) {
- fprintf(stderr, "[error] ctf-text error\n");
- goto end;
- }
-
- td_write = fmt_write->open_trace(NULL, O_RDWR, NULL, NULL);
- if (!td_write) {
- fprintf(stderr, "[error] Error opening output trace\n");
- goto end_free;
- }
-
- sout = container_of(td_write, struct ctf_text_stream_pos,
- trace_descriptor);
- if (!sout->parent.event_cb) {
- goto end_free;
- }
-
- ret = lttng_live_create_viewer_session(ctx);
- if (ret < 0) {
- goto end_free;
- }
-
- for (i = 0; i < ctx->session_ids->len; i++) {
- id = g_array_index(ctx->session_ids, uint64_t, i);
- printf_verbose("Attaching to session %" PRIu64 "\n", id);
- ret = lttng_live_attach_session(ctx, id);
- printf_verbose("Attaching session returns %d\n", ret);
- if (ret < 0) {
- if (ret == -LTTNG_VIEWER_ATTACH_UNK) {
- fprintf(stderr, "[error] Unknown session ID\n");
- }
- goto end_free;
- }
- }
-
- /*
- * As long as the session is active, we try to get new streams.
- */
- for (;;) {
- int flags;
-
- if (lttng_live_should_quit()) {
- ret = 0;
- goto end_free;
- }
-
- while (!ctx->session->stream_count) {
- if (lttng_live_should_quit()
- || ctx->session_ids->len == 0) {
- ret = 0;
- goto end_free;
- }
- ret = ask_new_streams(ctx);
- if (ret < 0) {
- goto end_free;
- }
- if (!ctx->session->stream_count) {
- (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
- }
- }
-
- ret = add_traces(ctx);
- if (ret < 0) {
- goto end_free;
- }
-
- begin_pos.type = BT_SEEK_BEGIN;
- iter = bt_ctf_iter_create(ctx->bt_ctx, &begin_pos, NULL);
- if (!iter) {
- if (lttng_live_should_quit()) {
- ret = 0;
- goto end;
- }
- fprintf(stderr, "[error] Iterator creation error\n");
- goto end;
- }
- for (;;) {
- if (lttng_live_should_quit()) {
- ret = 0;
- goto end_free;
- }
- event = bt_ctf_iter_read_event_flags(iter, &flags);
- if (!(flags & BT_ITER_FLAG_RETRY)) {
- if (!event) {
- /* End of trace */
- break;
- }
- ret = sout->parent.event_cb(&sout->parent,
- event->parent->stream);
- if (ret) {
- fprintf(stderr, "[error] Writing "
- "event failed.\n");
- goto end_free;
- }
- }
- ret = bt_iter_next(bt_ctf_get_iter(iter));
- if (ret < 0) {
- goto end_free;
- }
- }
- bt_ctf_iter_destroy(iter);
- g_hash_table_foreach_remove(ctx->session->ctf_traces,
- del_traces, ctx->bt_ctx);
- ctx->session->stream_count = 0;
- }
-
-end_free:
- bt_context_put(ctx->bt_ctx);
-end:
- if (lttng_live_should_quit()) {
- ret = 0;
- }
- return ret;
-}
projects / babeltrace.git / blobdiff