X-Git-Url: http://git.efficios.com/?p=babeltrace.git;a=blobdiff_plain;f=formats%2Flttng-live%2Flttng-live-comm.c;fp=formats%2Flttng-live%2Flttng-live-comm.c;h=0000000000000000000000000000000000000000;hp=6c5d4fd296f55fc9f23f4bba506432c3889f367c;hb=dc3fffef7b84cc4af1a7c99828fd57a106cd2257;hpb=f3985ab106d89d8e764c1a8dd0c8bda09b755d10 diff --git a/formats/lttng-live/lttng-live-comm.c b/formats/lttng-live/lttng-live-comm.c deleted file mode 100644 index 6c5d4fd2..00000000 --- a/formats/lttng-live/lttng-live-comm.c +++ /dev/null @@ -1,1754 +0,0 @@ -/* - * Copyright (C) 2013 - Julien Desfossez - * Mathieu Desnoyers - * - * 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 -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include - -#include -#include -#include -#include - -/* for packet_index */ -#include - -#include -#include -#include -#include - -#include -#include -#include -#include -#include -#include - -#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; -}