X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-relayd%2Fmain.c;h=6d800f50b3c0db40de5997ead9625fee8cf8938c;hp=795a694158d26d15c2cb4fdb5f0eee3cac6bbe39;hb=4169f5ad171ab88ac181ec4080f46af379bc7676;hpb=a02de639f6fbab546f2bf733b37a5e8e02bd8516 diff --git a/src/bin/lttng-relayd/main.c b/src/bin/lttng-relayd/main.c index 795a69415..6d800f50b 100644 --- a/src/bin/lttng-relayd/main.c +++ b/src/bin/lttng-relayd/main.c @@ -32,6 +32,7 @@ #include #include #include +#include #include #include #include @@ -56,8 +57,8 @@ /* command line options */ static int opt_daemon; static char *opt_output_path; -static struct lttng_uri *control_uri = NULL; -static struct lttng_uri *data_uri = NULL; +static struct lttng_uri *control_uri; +static struct lttng_uri *data_uri; const char *progname; static int is_root; /* Set to 1 if the daemon is running as root */ @@ -74,14 +75,15 @@ static int thread_quit_pipe[2] = { -1, -1 }; */ static int relay_cmd_pipe[2] = { -1, -1 }; +/* Shared between threads */ static int dispatch_thread_exit; static pthread_t listener_thread; static pthread_t dispatcher_thread; static pthread_t worker_thread; -static uint64_t last_relay_stream_id = 0; -static uint64_t last_relay_session_id = 0; +static uint64_t last_relay_stream_id; +static uint64_t last_relay_session_id; /* * Relay command queue. @@ -92,8 +94,8 @@ static uint64_t last_relay_session_id = 0; static struct relay_cmd_queue relay_cmd_queue; /* buffer allocated at startup, used to store the trace data */ -static char *data_buffer = NULL; -static unsigned int data_buffer_size = 0; +static char *data_buffer; +static unsigned int data_buffer_size; /* * usage function on stderr @@ -118,13 +120,13 @@ int parse_args(int argc, char **argv) char *default_address; static struct option long_options[] = { - { "control-port", 1, 0, 'C' }, - { "data-port", 1, 0, 'D' }, - { "daemonize", 0, 0, 'd' }, - { "help", 0, 0, 'h' }, - { "output", 1, 0, 'o' }, - { "verbose", 0, 0, 'v' }, - { NULL, 0, 0, 0 } + { "control-port", 1, 0, 'C', }, + { "data-port", 1, 0, 'D', }, + { "daemonize", 0, 0, 'd', }, + { "help", 0, 0, 'h', }, + { "output", 1, 0, 'o', }, + { "verbose", 0, 0, 'v', }, + { NULL, 0, 0, 0, }, }; while (1) { @@ -231,11 +233,14 @@ void cleanup(void) { DBG("Cleaning up"); + /* free the dynamically allocated opt_output_path */ + free(opt_output_path); + /* Close thread quit pipes */ utils_close_pipe(thread_quit_pipe); - /* Close relay cmd pipes */ - utils_close_pipe(relay_cmd_pipe); + uri_free(control_uri); + uri_free(data_uri); } /* @@ -246,8 +251,10 @@ int notify_thread_pipe(int wpipe) { int ret; - ret = write(wpipe, "!", 1); - if (ret < 0) { + do { + ret = write(wpipe, "!", 1); + } while (ret < 0 && errno == EINTR); + if (ret < 0 || ret != 1) { PERROR("write poll pipe"); } @@ -270,7 +277,7 @@ void stop_threads(void) } /* Dispatch thread */ - dispatch_thread_exit = 1; + CMM_STORE_SHARED(dispatch_thread_exit, 1); futex_nto1_wake(&relay_cmd_queue.futex); } @@ -440,34 +447,48 @@ error: return NULL; } +/* + * Return nonzero if stream needs to be closed. + */ +static +int close_stream_check(struct relay_stream *stream) +{ + + if (stream->close_flag && stream->prev_seq == stream->last_net_seq_num) { + /* + * We are about to close the stream so set the data pending flag to 1 + * which will make the end data pending command skip the stream which + * is now closed and ready. Note that after proceeding to a file close, + * the written file is ready for reading. + */ + stream->data_pending_check_done = 1; + return 1; + } + return 0; +} + /* * This thread manages the listening for new connections on the network */ static void *relay_thread_listener(void *data) { - int i, ret, pollfd; + int i, ret, pollfd, err = -1; int val = 1; uint32_t revents, nb_fd; struct lttng_poll_event events; struct lttcomm_sock *control_sock, *data_sock; - /* - * Get allocated in this thread, enqueued to a global queue, dequeued and - * freed in the worker thread. - */ - struct relay_command *relay_cmd = NULL; - DBG("[thread] Relay listener started"); control_sock = relay_init_sock(control_uri); if (!control_sock) { - goto error_sock; + goto error_sock_control; } data_sock = relay_init_sock(data_uri); if (!data_sock) { - goto error_sock; + goto error_sock_relay; } /* @@ -493,8 +514,6 @@ void *relay_thread_listener(void *data) while (1) { DBG("Listener accepting connections"); - nb_fd = LTTNG_POLL_GETNB(&events); - restart: ret = lttng_poll_wait(&events, -1); if (ret < 0) { @@ -507,6 +526,8 @@ restart: goto error; } + nb_fd = ret; + DBG("Relay new connection received"); for (i = 0; i < nb_fd; i++) { /* Fetch once the poll data */ @@ -516,14 +537,21 @@ restart: /* Thread quit pipe has been closed. Killing thread. */ ret = check_thread_quit_pipe(pollfd, revents); if (ret) { - goto error; + err = 0; + goto exit; } if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { ERR("socket poll error"); goto error; } else if (revents & LPOLLIN) { - struct lttcomm_sock *newsock = NULL; + /* + * Get allocated in this thread, + * enqueued to a global queue, dequeued + * and freed in the worker thread. + */ + struct relay_command *relay_cmd; + struct lttcomm_sock *newsock; relay_cmd = zmalloc(sizeof(struct relay_command)); if (relay_cmd == NULL) { @@ -533,16 +561,19 @@ restart: if (pollfd == data_sock->fd) { newsock = data_sock->ops->accept(data_sock); - if (newsock < 0) { + if (!newsock) { PERROR("accepting data sock"); + free(relay_cmd); goto error; } relay_cmd->type = RELAY_DATA; DBG("Relay data connection accepted, socket %d", newsock->fd); - } else if (pollfd == control_sock->fd) { + } else { + assert(pollfd == control_sock->fd); newsock = control_sock->ops->accept(control_sock); - if (newsock < 0) { + if (!newsock) { PERROR("accepting control sock"); + free(relay_cmd); goto error; } relay_cmd->type = RELAY_CONTROL; @@ -552,6 +583,8 @@ restart: &val, sizeof(int)); if (ret < 0) { PERROR("setsockopt inet"); + lttcomm_destroy_sock(newsock); + free(relay_cmd); goto error; } relay_cmd->sock = newsock; @@ -569,28 +602,32 @@ restart: } } +exit: error: error_poll_add: lttng_poll_clean(&events); error_create_poll: - if (control_sock->fd >= 0) { - ret = control_sock->ops->close(control_sock); + if (data_sock->fd >= 0) { + ret = data_sock->ops->close(data_sock); if (ret) { PERROR("close"); } - lttcomm_destroy_sock(control_sock); } - if (data_sock->fd >= 0) { - ret = data_sock->ops->close(data_sock); + lttcomm_destroy_sock(data_sock); +error_sock_relay: + if (control_sock->fd >= 0) { + ret = control_sock->ops->close(control_sock); if (ret) { PERROR("close"); } - lttcomm_destroy_sock(data_sock); } - + lttcomm_destroy_sock(control_sock); +error_sock_control: + if (err) { + DBG("Thread exited with error"); + } DBG("Relay listener thread cleanup complete"); stop_threads(); -error_sock: return NULL; } @@ -606,7 +643,7 @@ void *relay_thread_dispatcher(void *data) DBG("[thread] Relay dispatcher started"); - while (!dispatch_thread_exit) { + while (!CMM_LOAD_SHARED(dispatch_thread_exit)) { /* Atomically prepare the queue futex */ futex_nto1_prepare(&relay_cmd_queue.futex); @@ -627,10 +664,12 @@ void *relay_thread_dispatcher(void *data) * call is blocking so we can be assured that the data will be read * at some point in time or wait to the end of the world :) */ - ret = write(relay_cmd_pipe[1], relay_cmd, - sizeof(struct relay_command)); + do { + ret = write(relay_cmd_pipe[1], relay_cmd, + sizeof(struct relay_command)); + } while (ret < 0 && errno == EINTR); free(relay_cmd); - if (ret < 0) { + if (ret < 0 || ret != sizeof(struct relay_command)) { PERROR("write cmd pipe"); goto error; } @@ -656,7 +695,7 @@ static char *expand_full_path(const char *path) { const char *end_path = path; - char *next, *cut_path, *expanded_path; + char *next, *cut_path, *expanded_path, *respath; /* Find last token delimited by '/' */ while ((next = strpbrk(end_path + 1, "/"))) { @@ -668,11 +707,12 @@ char *expand_full_path(const char *path) expanded_path = malloc(PATH_MAX); if (expanded_path == NULL) { - goto error; + respath = NULL; + goto end; } - expanded_path = realpath((char *)cut_path, expanded_path); - if (expanded_path == NULL) { + respath = realpath(cut_path, expanded_path); + if (respath == NULL) { switch (errno) { case ENOENT: ERR("%s: No such file or directory", cut_path); @@ -681,18 +721,14 @@ char *expand_full_path(const char *path) PERROR("realpath"); break; } - goto error; + free(expanded_path); + } else { + /* Add end part to expanded path */ + strcat(respath, end_path); } - - /* Add end part to expanded path */ - strcat(expanded_path, end_path); - - free(cut_path); - return expanded_path; - -error: +end: free(cut_path); - return NULL; + return respath; } @@ -744,7 +780,7 @@ int mkdir_recursive(char *path, mode_t mode) if (ret < 0) { ret = mkdir(tmp, mode); if (ret < 0) { - if (!(errno == EEXIST)) { + if (errno != EEXIST) { PERROR("mkdir recursive"); ret = -errno; goto error; @@ -757,7 +793,7 @@ int mkdir_recursive(char *path, mode_t mode) ret = mkdir(tmp, mode); if (ret < 0) { - if (!(errno == EEXIST)) { + if (errno != EEXIST) { PERROR("mkdir recursive last piece"); ret = -errno; } else { @@ -769,46 +805,73 @@ error: return ret; } +static +char *create_output_path_auto(char *path_name) +{ + int ret; + char *traces_path = NULL; + char *alloc_path = NULL; + char *default_path; + + default_path = config_get_default_path(); + if (default_path == NULL) { + ERR("Home path not found.\n \ + Please specify an output path using -o, --output PATH"); + goto exit; + } + alloc_path = strdup(default_path); + if (alloc_path == NULL) { + PERROR("Path allocation"); + goto exit; + } + ret = asprintf(&traces_path, "%s/" DEFAULT_TRACE_DIR_NAME + "/%s", alloc_path, path_name); + if (ret < 0) { + PERROR("asprintf trace dir name"); + goto exit; + } +exit: + free(alloc_path); + return traces_path; +} + +static +char *create_output_path_noauto(char *path_name) +{ + int ret; + char *traces_path = NULL; + char *full_path; + + full_path = expand_full_path(opt_output_path); + ret = asprintf(&traces_path, "%s/%s", full_path, path_name); + if (ret < 0) { + PERROR("asprintf trace dir name"); + goto exit; + } +exit: + free(full_path); + return traces_path; +} + /* * create_output_path: create the output trace directory */ static char *create_output_path(char *path_name) { - int ret = 0; - char *alloc_path = NULL; - char *traces_path = NULL; - char *full_path = NULL; - - /* Auto output path */ if (opt_output_path == NULL) { - alloc_path = strdup(config_get_default_path()); - if (alloc_path == NULL) { - ERR("Home path not found.\n \ - Please specify an output path using -o, --output PATH"); - ret = -1; - goto exit; - } - - ret = asprintf(&traces_path, "%s/" DEFAULT_TRACE_DIR_NAME - "/%s", alloc_path, path_name); - if (ret < 0) { - PERROR("asprintf trace dir name"); - goto exit; - } + return create_output_path_auto(path_name); } else { - full_path = expand_full_path(opt_output_path); - ret = asprintf(&traces_path, "%s/%s", full_path, path_name); - if (ret < 0) { - PERROR("asprintf trace dir name"); - goto exit; - } + return create_output_path_noauto(path_name); } - free(alloc_path); - free(full_path); +} -exit: - return traces_path; +static +void deferred_free_stream(struct rcu_head *head) +{ + struct relay_stream *stream = + caa_container_of(head, struct relay_stream, rcu_node); + free(stream); } /* @@ -823,25 +886,82 @@ void relay_delete_session(struct relay_command *cmd, struct lttng_ht *streams_ht struct relay_stream *stream; int ret; - if (!cmd->session) + if (!cmd->session) { return; + } - DBG("Relay deleting session %lu", cmd->session->id); - free(cmd->session->sock); + DBG("Relay deleting session %" PRIu64, cmd->session->id); + rcu_read_lock(); cds_lfht_for_each_entry(streams_ht->ht, &iter.iter, node, node) { node = lttng_ht_iter_get_node_ulong(&iter); if (node) { stream = caa_container_of(node, struct relay_stream, stream_n); if (stream->session == cmd->session) { - close(stream->fd); + ret = close(stream->fd); + if (ret < 0) { + PERROR("close stream fd on delete session"); + } ret = lttng_ht_del(streams_ht, &iter); assert(!ret); - free(stream); + call_rcu(&stream->rcu_node, + deferred_free_stream); } } } + rcu_read_unlock(); + + free(cmd->session); +} + +/* + * Handle the RELAYD_CREATE_SESSION command. + * + * On success, send back the session id or else return a negative value. + */ +static +int relay_create_session(struct lttcomm_relayd_hdr *recv_hdr, + struct relay_command *cmd) +{ + int ret = 0, send_ret; + struct relay_session *session; + struct lttcomm_relayd_status_session reply; + + assert(recv_hdr); + assert(cmd); + + memset(&reply, 0, sizeof(reply)); + + session = zmalloc(sizeof(struct relay_session)); + if (session == NULL) { + PERROR("relay session zmalloc"); + ret = -1; + goto error; + } + + session->id = ++last_relay_session_id; + session->sock = cmd->sock; + cmd->session = session; + + reply.session_id = htobe64(session->id); + + DBG("Created session %" PRIu64, session->id); + +error: + if (ret < 0) { + reply.ret_code = htobe32(LTTNG_ERR_FATAL); + } else { + reply.ret_code = htobe32(LTTNG_OK); + } + + send_ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); + if (send_ret < 0) { + ERR("Relayd sending session id"); + ret = send_ret; + } + + return ret; } /* @@ -858,17 +978,21 @@ int relay_add_stream(struct lttcomm_relayd_hdr *recv_hdr, char *path = NULL, *root_path = NULL; int ret, send_ret; - if (!session || session->version_check_done == 0) { + if (!session || cmd->version_check_done == 0) { ERR("Trying to add a stream before version check"); ret = -1; goto end_no_session; } - /* FIXME : use data_size for something ? */ ret = cmd->sock->ops->recvmsg(cmd->sock, &stream_info, - sizeof(struct lttcomm_relayd_add_stream), MSG_WAITALL); + sizeof(struct lttcomm_relayd_add_stream), 0); if (ret < sizeof(struct lttcomm_relayd_add_stream)) { - ERR("Relay didn't receive valid add_stream struct size : %d", ret); + if (ret == 0) { + /* Orderly shutdown. Not necessary to print an error. */ + DBG("Socket %d did an orderly shutdown", cmd->sock->fd); + } else { + ERR("Relay didn't receive valid add_stream struct size : %d", ret); + } ret = -1; goto end_no_session; } @@ -879,8 +1003,9 @@ int relay_add_stream(struct lttcomm_relayd_hdr *recv_hdr, goto end_no_session; } + rcu_read_lock(); stream->stream_handle = ++last_relay_stream_id; - stream->seq = 0; + stream->prev_seq = -1ULL; stream->session = session; root_path = create_output_path(stream_info.pathname); @@ -890,7 +1015,6 @@ int relay_add_stream(struct lttcomm_relayd_hdr *recv_hdr, } ret = mkdir_recursive(root_path, S_IRWXU | S_IRWXG); if (ret < 0) { - free(root_path); ERR("relay creating output directory"); goto end; } @@ -922,15 +1046,106 @@ end: free(root_path); /* send the session id to the client or a negative return code on error */ if (ret < 0) { - reply.ret_code = htobe32(LTTCOMM_ERR); + reply.ret_code = htobe32(LTTNG_ERR_UNK); } else { - reply.ret_code = htobe32(LTTCOMM_OK); + reply.ret_code = htobe32(LTTNG_OK); } reply.handle = htobe64(stream->stream_handle); send_ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(struct lttcomm_relayd_status_stream), 0); if (send_ret < 0) { ERR("Relay sending stream id"); + ret = send_ret; + } + rcu_read_unlock(); + +end_no_session: + return ret; +} + +/* + * relay_close_stream: close a specific stream + */ +static +int relay_close_stream(struct lttcomm_relayd_hdr *recv_hdr, + struct relay_command *cmd, struct lttng_ht *streams_ht) +{ + struct relay_session *session = cmd->session; + struct lttcomm_relayd_close_stream stream_info; + struct lttcomm_relayd_generic_reply reply; + struct relay_stream *stream; + int ret, send_ret; + struct lttng_ht_node_ulong *node; + struct lttng_ht_iter iter; + + DBG("Close stream received"); + + if (!session || cmd->version_check_done == 0) { + ERR("Trying to close a stream before version check"); + ret = -1; + goto end_no_session; + } + + ret = cmd->sock->ops->recvmsg(cmd->sock, &stream_info, + sizeof(struct lttcomm_relayd_close_stream), 0); + if (ret < sizeof(struct lttcomm_relayd_close_stream)) { + if (ret == 0) { + /* Orderly shutdown. Not necessary to print an error. */ + DBG("Socket %d did an orderly shutdown", cmd->sock->fd); + } else { + ERR("Relay didn't receive valid add_stream struct size : %d", ret); + } + ret = -1; + goto end_no_session; + } + + rcu_read_lock(); + lttng_ht_lookup(streams_ht, + (void *)((unsigned long) be64toh(stream_info.stream_id)), + &iter); + node = lttng_ht_iter_get_node_ulong(&iter); + if (node == NULL) { + DBG("Relay stream %" PRIu64 " not found", be64toh(stream_info.stream_id)); + ret = -1; + goto end_unlock; + } + + stream = caa_container_of(node, struct relay_stream, stream_n); + if (!stream) { + ret = -1; + goto end_unlock; + } + + stream->last_net_seq_num = be64toh(stream_info.last_net_seq_num); + stream->close_flag = 1; + + if (close_stream_check(stream)) { + int delret; + + delret = close(stream->fd); + if (delret < 0) { + PERROR("close stream"); + } + delret = lttng_ht_del(streams_ht, &iter); + assert(!delret); + call_rcu(&stream->rcu_node, + deferred_free_stream); + DBG("Closed tracefile %d from close stream", stream->fd); + } + +end_unlock: + rcu_read_unlock(); + + if (ret < 0) { + reply.ret_code = htobe32(LTTNG_ERR_UNK); + } else { + reply.ret_code = htobe32(LTTNG_OK); + } + send_ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, + sizeof(struct lttcomm_relayd_generic_reply), 0); + if (send_ret < 0) { + ERR("Relay sending stream id"); + ret = send_ret; } end_no_session: @@ -946,7 +1161,7 @@ void relay_unknown_command(struct relay_command *cmd) struct lttcomm_relayd_generic_reply reply; int ret; - reply.ret_code = htobe32(LTTCOMM_ERR); + reply.ret_code = htobe32(LTTNG_ERR_UNK); ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(struct lttcomm_relayd_generic_reply), 0); if (ret < 0) { @@ -962,13 +1177,13 @@ static int relay_start(struct lttcomm_relayd_hdr *recv_hdr, struct relay_command *cmd) { - int ret = htobe32(LTTCOMM_OK); + int ret = htobe32(LTTNG_OK); struct lttcomm_relayd_generic_reply reply; struct relay_session *session = cmd->session; if (!session) { DBG("Trying to start the streaming without a session established"); - ret = htobe32(LTTCOMM_ERR); + ret = htobe32(LTTNG_ERR_UNK); } reply.ret_code = ret; @@ -983,6 +1198,7 @@ int relay_start(struct lttcomm_relayd_hdr *recv_hdr, /* * Get stream from stream id. + * Need to be called with RCU read-side lock held. */ static struct relay_stream *relay_stream_from_stream_id(uint64_t stream_id, @@ -997,7 +1213,7 @@ struct relay_stream *relay_stream_from_stream_id(uint64_t stream_id, &iter); node = lttng_ht_iter_get_node_ulong(&iter); if (node == NULL) { - DBG("Relay stream %lu not found", stream_id); + DBG("Relay stream %" PRIu64 " not found", stream_id); ret = NULL; goto end; } @@ -1008,6 +1224,38 @@ end: return ret; } +/* + * Append padding to the file pointed by the file descriptor fd. + */ +static int write_padding_to_file(int fd, uint32_t size) +{ + int ret = 0; + char *zeros; + + if (size == 0) { + goto end; + } + + zeros = zmalloc(size); + if (zeros == NULL) { + PERROR("zmalloc zeros for padding"); + ret = -1; + goto end; + } + + do { + ret = write(fd, zeros, size); + } while (ret < 0 && errno == EINTR); + if (ret < 0 || ret != size) { + PERROR("write padding to file"); + } + + free(zeros); + +end: + return ret; +} + /* * relay_recv_metadata: receive the metada for the session. */ @@ -1015,7 +1263,7 @@ static int relay_recv_metadata(struct lttcomm_relayd_hdr *recv_hdr, struct relay_command *cmd, struct lttng_ht *streams_ht) { - int ret = htobe32(LTTCOMM_OK); + int ret = htobe32(LTTNG_OK); struct relay_session *session = cmd->session; struct lttcomm_relayd_metadata_payload *metadata_struct; struct relay_stream *metadata_stream; @@ -1027,42 +1275,71 @@ int relay_recv_metadata(struct lttcomm_relayd_hdr *recv_hdr, goto end; } - data_size = be64toh(recv_hdr->data_size); - payload_size = data_size - sizeof(uint64_t); + data_size = payload_size = be64toh(recv_hdr->data_size); + if (data_size < sizeof(struct lttcomm_relayd_metadata_payload)) { + ERR("Incorrect data size"); + ret = -1; + goto end; + } + payload_size -= sizeof(struct lttcomm_relayd_metadata_payload); + if (data_buffer_size < data_size) { - data_buffer = realloc(data_buffer, data_size); - if (!data_buffer) { + /* In case the realloc fails, we can free the memory */ + char *tmp_data_ptr; + + tmp_data_ptr = realloc(data_buffer, data_size); + if (!tmp_data_ptr) { ERR("Allocating data buffer"); + free(data_buffer); ret = -1; goto end; } + data_buffer = tmp_data_ptr; data_buffer_size = data_size; } memset(data_buffer, 0, data_size); - DBG2("Relay receiving metadata, waiting for %lu bytes", data_size); - ret = cmd->sock->ops->recvmsg(cmd->sock, data_buffer, data_size, MSG_WAITALL); + DBG2("Relay receiving metadata, waiting for %" PRIu64 " bytes", data_size); + ret = cmd->sock->ops->recvmsg(cmd->sock, data_buffer, data_size, 0); if (ret < 0 || ret != data_size) { + if (ret == 0) { + /* Orderly shutdown. Not necessary to print an error. */ + DBG("Socket %d did an orderly shutdown", cmd->sock->fd); + } else { + ERR("Relay didn't receive the whole metadata"); + } ret = -1; - ERR("Relay didn't receive the whole metadata"); goto end; } metadata_struct = (struct lttcomm_relayd_metadata_payload *) data_buffer; + + rcu_read_lock(); metadata_stream = relay_stream_from_stream_id( be64toh(metadata_struct->stream_id), streams_ht); if (!metadata_stream) { ret = -1; - goto end; + goto end_unlock; } - ret = write(metadata_stream->fd, metadata_struct->payload, - payload_size); - if (ret < (payload_size)) { + do { + ret = write(metadata_stream->fd, metadata_struct->payload, + payload_size); + } while (ret < 0 && errno == EINTR); + if (ret < 0 || ret != payload_size) { ERR("Relay error writing metadata on file"); ret = -1; - goto end; + goto end_unlock; + } + + ret = write_padding_to_file(metadata_stream->fd, + be32toh(metadata_struct->padding_size)); + if (ret < 0) { + goto end_unlock; } + DBG2("Relay metadata written"); +end_unlock: + rcu_read_unlock(); end: return ret; } @@ -1074,24 +1351,39 @@ static int relay_send_version(struct lttcomm_relayd_hdr *recv_hdr, struct relay_command *cmd) { - int ret = htobe32(LTTCOMM_OK); - struct lttcomm_relayd_version reply; - struct relay_session *session = NULL; - - if (cmd->session == NULL) { - session = zmalloc(sizeof(struct relay_session)); - if (session == NULL) { - PERROR("relay session zmalloc"); - ret = -1; - goto end; + int ret; + struct lttcomm_relayd_version reply, msg; + + assert(cmd); + + cmd->version_check_done = 1; + + /* Get version from the other side. */ + ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); + if (ret < 0 || ret != sizeof(msg)) { + if (ret == 0) { + /* Orderly shutdown. Not necessary to print an error. */ + DBG("Socket %d did an orderly shutdown", cmd->sock->fd); + } else { + ERR("Relay failed to receive the version values."); } - session->id = ++last_relay_session_id; - DBG("Created session %lu", session->id); - cmd->session = session; + ret = -1; + goto end; } - session->version_check_done = 1; - sscanf(VERSION, "%u.%u", &reply.major, &reply.minor); + /* + * For now, we just ignore the received version but after 2.1 stable + * release, a check must be done to see if we either adapt to the other + * side version (which MUST be lower than us) or keep the latest data + * structure considering that the other side will adapt. + */ + + ret = sscanf(VERSION, "%10u.%10u", &reply.major, &reply.minor); + if (ret < 2) { + ERR("Error in scanning version"); + ret = -1; + goto end; + } reply.major = htobe32(reply.major); reply.minor = htobe32(reply.minor); ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, @@ -1099,12 +1391,301 @@ int relay_send_version(struct lttcomm_relayd_hdr *recv_hdr, if (ret < 0) { ERR("Relay sending version"); } - DBG("Version check done"); + DBG("Version check done (%u.%u)", be32toh(reply.major), + be32toh(reply.minor)); end: return ret; } +/* + * Check for data pending for a given stream id from the session daemon. + */ +static +int relay_data_pending(struct lttcomm_relayd_hdr *recv_hdr, + struct relay_command *cmd, struct lttng_ht *streams_ht) +{ + struct relay_session *session = cmd->session; + struct lttcomm_relayd_data_pending msg; + struct lttcomm_relayd_generic_reply reply; + struct relay_stream *stream; + int ret; + struct lttng_ht_node_ulong *node; + struct lttng_ht_iter iter; + uint64_t last_net_seq_num, stream_id; + + DBG("Data pending command received"); + + if (!session || cmd->version_check_done == 0) { + ERR("Trying to check for data before version check"); + ret = -1; + goto end_no_session; + } + + ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); + if (ret < sizeof(msg)) { + if (ret == 0) { + /* Orderly shutdown. Not necessary to print an error. */ + DBG("Socket %d did an orderly shutdown", cmd->sock->fd); + } else { + ERR("Relay didn't receive valid data_pending struct size : %d", + ret); + } + ret = -1; + goto end_no_session; + } + + stream_id = be64toh(msg.stream_id); + last_net_seq_num = be64toh(msg.last_net_seq_num); + + rcu_read_lock(); + lttng_ht_lookup(streams_ht, (void *)((unsigned long) stream_id), &iter); + node = lttng_ht_iter_get_node_ulong(&iter); + if (node == NULL) { + DBG("Relay stream %" PRIu64 " not found", stream_id); + ret = -1; + goto end_unlock; + } + + stream = caa_container_of(node, struct relay_stream, stream_n); + assert(stream); + + DBG("Data pending for stream id %" PRIu64 " prev_seq %" PRIu64 + " and last_seq %" PRIu64, stream_id, stream->prev_seq, + last_net_seq_num); + + /* Avoid wrapping issue */ + if (((int64_t) (stream->prev_seq - last_net_seq_num)) >= 0) { + /* Data has in fact been written and is NOT pending */ + ret = 0; + } else { + /* Data still being streamed thus pending */ + ret = 1; + } + + /* Pending check is now done. */ + stream->data_pending_check_done = 1; + +end_unlock: + rcu_read_unlock(); + + reply.ret_code = htobe32(ret); + ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); + if (ret < 0) { + ERR("Relay data pending ret code failed"); + } + +end_no_session: + return ret; +} + +/* + * Wait for the control socket to reach a quiescent state. + * + * Note that for now, when receiving this command from the session daemon, this + * means that every subsequent commands or data received on the control socket + * has been handled. So, this is why we simply return OK here. + */ +static +int relay_quiescent_control(struct lttcomm_relayd_hdr *recv_hdr, + struct relay_command *cmd, struct lttng_ht *streams_ht) +{ + int ret; + uint64_t stream_id; + struct relay_stream *stream; + struct lttng_ht_iter iter; + struct lttcomm_relayd_quiescent_control msg; + struct lttcomm_relayd_generic_reply reply; + + DBG("Checking quiescent state on control socket"); + + if (!cmd->session || cmd->version_check_done == 0) { + ERR("Trying to check for data before version check"); + ret = -1; + goto end_no_session; + } + + ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); + if (ret < sizeof(msg)) { + if (ret == 0) { + /* Orderly shutdown. Not necessary to print an error. */ + DBG("Socket %d did an orderly shutdown", cmd->sock->fd); + } else { + ERR("Relay didn't receive valid begin data_pending struct size: %d", + ret); + } + ret = -1; + goto end_no_session; + } + + stream_id = be64toh(msg.stream_id); + + rcu_read_lock(); + cds_lfht_for_each_entry(streams_ht->ht, &iter.iter, stream, stream_n.node) { + if (stream->stream_handle == stream_id) { + stream->data_pending_check_done = 1; + DBG("Relay quiescent control pending flag set to %" PRIu64, + stream_id); + break; + } + } + rcu_read_unlock(); + + reply.ret_code = htobe32(LTTNG_OK); + ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); + if (ret < 0) { + ERR("Relay data quiescent control ret code failed"); + } + +end_no_session: + return ret; +} + +/* + * Initialize a data pending command. This means that a client is about to ask + * for data pending for each stream he/she holds. Simply iterate over all + * streams of a session and set the data_pending_check_done flag. + * + * This command returns to the client a LTTNG_OK code. + */ +static +int relay_begin_data_pending(struct lttcomm_relayd_hdr *recv_hdr, + struct relay_command *cmd, struct lttng_ht *streams_ht) +{ + int ret; + struct lttng_ht_iter iter; + struct lttcomm_relayd_begin_data_pending msg; + struct lttcomm_relayd_generic_reply reply; + struct relay_stream *stream; + uint64_t session_id; + + assert(recv_hdr); + assert(cmd); + assert(streams_ht); + + DBG("Init streams for data pending"); + + if (!cmd->session || cmd->version_check_done == 0) { + ERR("Trying to check for data before version check"); + ret = -1; + goto end_no_session; + } + + ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); + if (ret < sizeof(msg)) { + if (ret == 0) { + /* Orderly shutdown. Not necessary to print an error. */ + DBG("Socket %d did an orderly shutdown", cmd->sock->fd); + } else { + ERR("Relay didn't receive valid begin data_pending struct size: %d", + ret); + } + ret = -1; + goto end_no_session; + } + + session_id = be64toh(msg.session_id); + + /* + * Iterate over all streams to set the begin data pending flag. For now, the + * streams are indexed by stream handle so we have to iterate over all + * streams to find the one associated with the right session_id. + */ + rcu_read_lock(); + cds_lfht_for_each_entry(streams_ht->ht, &iter.iter, stream, stream_n.node) { + if (stream->session->id == session_id) { + stream->data_pending_check_done = 0; + DBG("Set begin data pending flag to stream %" PRIu64, + stream->stream_handle); + } + } + rcu_read_unlock(); + + /* All good, send back reply. */ + reply.ret_code = htobe32(LTTNG_OK); + + ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); + if (ret < 0) { + ERR("Relay begin data pending send reply failed"); + } + +end_no_session: + return ret; +} + +/* + * End data pending command. This will check, for a given session id, if each + * stream associated with it has its data_pending_check_done flag set. If not, + * this means that the client lost track of the stream but the data is still + * being streamed on our side. In this case, we inform the client that data is + * inflight. + * + * Return to the client if there is data in flight or not with a ret_code. + */ +static +int relay_end_data_pending(struct lttcomm_relayd_hdr *recv_hdr, + struct relay_command *cmd, struct lttng_ht *streams_ht) +{ + int ret; + struct lttng_ht_iter iter; + struct lttcomm_relayd_end_data_pending msg; + struct lttcomm_relayd_generic_reply reply; + struct relay_stream *stream; + uint64_t session_id; + uint32_t is_data_inflight = 0; + + assert(recv_hdr); + assert(cmd); + assert(streams_ht); + + DBG("End data pending command"); + + if (!cmd->session || cmd->version_check_done == 0) { + ERR("Trying to check for data before version check"); + ret = -1; + goto end_no_session; + } + + ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); + if (ret < sizeof(msg)) { + if (ret == 0) { + /* Orderly shutdown. Not necessary to print an error. */ + DBG("Socket %d did an orderly shutdown", cmd->sock->fd); + } else { + ERR("Relay didn't receive valid end data_pending struct size: %d", + ret); + } + ret = -1; + goto end_no_session; + } + + session_id = be64toh(msg.session_id); + + /* Iterate over all streams to see if the begin data pending flag is set. */ + rcu_read_lock(); + cds_lfht_for_each_entry(streams_ht->ht, &iter.iter, stream, stream_n.node) { + if (stream->session->id == session_id && + !stream->data_pending_check_done) { + is_data_inflight = 1; + DBG("Data is still in flight for stream %" PRIu64, + stream->stream_handle); + break; + } + } + rcu_read_unlock(); + + /* All good, send back reply. */ + reply.ret_code = htobe32(is_data_inflight); + + ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); + if (ret < 0) { + ERR("Relay end data pending send reply failed"); + } + +end_no_session: + return ret; +} + /* * relay_process_control: Process the commands received on the control socket */ @@ -1115,11 +1696,9 @@ int relay_process_control(struct lttcomm_relayd_hdr *recv_hdr, int ret = 0; switch (be32toh(recv_hdr->cmd)) { - /* case RELAYD_CREATE_SESSION: ret = relay_create_session(recv_hdr, cmd); break; - */ case RELAYD_ADD_STREAM: ret = relay_add_stream(recv_hdr, cmd, streams_ht); break; @@ -1132,6 +1711,21 @@ int relay_process_control(struct lttcomm_relayd_hdr *recv_hdr, case RELAYD_VERSION: ret = relay_send_version(recv_hdr, cmd); break; + case RELAYD_CLOSE_STREAM: + ret = relay_close_stream(recv_hdr, cmd, streams_ht); + break; + case RELAYD_DATA_PENDING: + ret = relay_data_pending(recv_hdr, cmd, streams_ht); + break; + case RELAYD_QUIESCENT_CONTROL: + ret = relay_quiescent_control(recv_hdr, cmd, streams_ht); + break; + case RELAYD_BEGIN_DATA_PENDING: + ret = relay_begin_data_pending(recv_hdr, cmd, streams_ht); + break; + case RELAYD_END_DATA_PENDING: + ret = relay_end_data_pending(recv_hdr, cmd, streams_ht); + break; case RELAYD_UPDATE_SYNC_INFO: default: ERR("Received unknown command (%u)", be32toh(recv_hdr->cmd)); @@ -1154,61 +1748,108 @@ int relay_process_data(struct relay_command *cmd, struct lttng_ht *streams_ht) struct relay_stream *stream; struct lttcomm_relayd_data_hdr data_hdr; uint64_t stream_id; + uint64_t net_seq_num; uint32_t data_size; ret = cmd->sock->ops->recvmsg(cmd->sock, &data_hdr, - sizeof(struct lttcomm_relayd_data_hdr), MSG_WAITALL); + sizeof(struct lttcomm_relayd_data_hdr), 0); if (ret <= 0) { - ERR("Connections seems to be closed"); + if (ret == 0) { + /* Orderly shutdown. Not necessary to print an error. */ + DBG("Socket %d did an orderly shutdown", cmd->sock->fd); + } else { + ERR("Unable to receive data header on sock %d", cmd->sock->fd); + } ret = -1; goto end; } stream_id = be64toh(data_hdr.stream_id); + + rcu_read_lock(); stream = relay_stream_from_stream_id(stream_id, streams_ht); if (!stream) { ret = -1; - goto end; + goto end_unlock; } data_size = be32toh(data_hdr.data_size); if (data_buffer_size < data_size) { - data_buffer = realloc(data_buffer, data_size); - if (!data_buffer) { + char *tmp_data_ptr; + + tmp_data_ptr = realloc(data_buffer, data_size); + if (!tmp_data_ptr) { ERR("Allocating data buffer"); + free(data_buffer); ret = -1; - goto end; + goto end_unlock; } + data_buffer = tmp_data_ptr; data_buffer_size = data_size; } memset(data_buffer, 0, data_size); - ret = cmd->sock->ops->recvmsg(cmd->sock, data_buffer, data_size, MSG_WAITALL); + net_seq_num = be64toh(data_hdr.net_seq_num); + + DBG3("Receiving data of size %u for stream id %" PRIu64 " seqnum %" PRIu64, + data_size, stream_id, net_seq_num); + ret = cmd->sock->ops->recvmsg(cmd->sock, data_buffer, data_size, 0); if (ret <= 0) { + if (ret == 0) { + /* Orderly shutdown. Not necessary to print an error. */ + DBG("Socket %d did an orderly shutdown", cmd->sock->fd); + } ret = -1; - goto end; + goto end_unlock; } - ret = write(stream->fd, data_buffer, data_size); - if (ret < data_size) { + do { + ret = write(stream->fd, data_buffer, data_size); + } while (ret < 0 && errno == EINTR); + if (ret < 0 || ret != data_size) { ERR("Relay error writing data to file"); ret = -1; - goto end; + goto end_unlock; + } + + DBG2("Relay wrote %d bytes to tracefile for stream id %" PRIu64, + ret, stream->stream_handle); + + ret = write_padding_to_file(stream->fd, be32toh(data_hdr.padding_size)); + if (ret < 0) { + goto end_unlock; } - DBG2("Relay wrote %d bytes to tracefile for stream id %lu", ret, stream->stream_handle); + stream->prev_seq = net_seq_num; + + /* Check if we need to close the FD */ + if (close_stream_check(stream)) { + int cret; + struct lttng_ht_iter iter; + + cret = close(stream->fd); + if (cret < 0) { + PERROR("close stream process data"); + } + iter.iter.node = &stream->stream_n.node; + ret = lttng_ht_del(streams_ht, &iter); + assert(!ret); + call_rcu(&stream->rcu_node, + deferred_free_stream); + DBG("Closed tracefile %d after recv data", stream->fd); + } + +end_unlock: + rcu_read_unlock(); end: return ret; } static -void relay_cleanup_connection(struct lttng_ht *relay_connections_ht, struct lttng_poll_event *events, - struct lttng_ht *streams_ht, int pollfd, struct lttng_ht_iter *iter) +void relay_cleanup_poll_connection(struct lttng_poll_event *events, int pollfd) { int ret; - ret = lttng_ht_del(relay_connections_ht, iter); - assert(!ret); lttng_poll_del(events, pollfd); ret = close(pollfd); @@ -1221,32 +1862,63 @@ static int relay_add_connection(int fd, struct lttng_poll_event *events, struct lttng_ht *relay_connections_ht) { - int ret; struct relay_command *relay_connection; + int ret; relay_connection = zmalloc(sizeof(struct relay_command)); if (relay_connection == NULL) { PERROR("Relay command zmalloc"); - ret = -1; - goto end; + goto error; } - ret = read(fd, relay_connection, sizeof(struct relay_command)); - if (ret < 0 || ret < sizeof(relay_connection)) { + do { + ret = read(fd, relay_connection, sizeof(struct relay_command)); + } while (ret < 0 && errno == EINTR); + if (ret < 0 || ret < sizeof(struct relay_command)) { PERROR("read relay cmd pipe"); - ret = -1; - goto end; + goto error_read; } lttng_ht_node_init_ulong(&relay_connection->sock_n, (unsigned long) relay_connection->sock->fd); + rcu_read_lock(); lttng_ht_add_unique_ulong(relay_connections_ht, &relay_connection->sock_n); - ret = lttng_poll_add(events, + rcu_read_unlock(); + return lttng_poll_add(events, relay_connection->sock->fd, LPOLLIN | LPOLLRDHUP); -end: - return ret; +error_read: + free(relay_connection); +error: + return -1; +} + +static +void deferred_free_connection(struct rcu_head *head) +{ + struct relay_command *relay_connection = + caa_container_of(head, struct relay_command, rcu_node); + + lttcomm_destroy_sock(relay_connection->sock); + free(relay_connection); +} + +static +void relay_del_connection(struct lttng_ht *relay_connections_ht, + struct lttng_ht *streams_ht, struct lttng_ht_iter *iter, + struct relay_command *relay_connection) +{ + int ret; + + ret = lttng_ht_del(relay_connections_ht, iter); + assert(!ret); + if (relay_connection->type == RELAY_CONTROL) { + relay_delete_session(relay_connection, streams_ht); + } + + call_rcu(&relay_connection->rcu_node, + deferred_free_connection); } /* @@ -1255,8 +1927,8 @@ end: static void *relay_thread_worker(void *data) { - int i, ret, pollfd; - uint32_t revents, nb_fd; + int ret, err = -1, last_seen_data_fd = -1; + uint32_t nb_fd; struct relay_command *relay_connection; struct lttng_poll_event events; struct lttng_ht *relay_connections_ht; @@ -1267,11 +1939,19 @@ void *relay_thread_worker(void *data) DBG("[thread] Relay worker started"); + rcu_register_thread(); + /* table of connections indexed on socket */ relay_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); + if (!relay_connections_ht) { + goto relay_connections_ht_error; + } /* tables of streams indexed by stream ID */ streams_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); + if (!streams_ht) { + goto streams_ht_error; + } ret = create_thread_poll_set(&events, 2); if (ret < 0) { @@ -1283,14 +1963,12 @@ void *relay_thread_worker(void *data) goto error; } +restart: while (1) { - /* Zeroed the events structure */ - lttng_poll_reset(&events); - - nb_fd = LTTNG_POLL_GETNB(&events); + int idx = -1, i, seen_control = 0, last_notdel_data_fd = -1; /* Infinite blocking call, waiting for transmission */ - restart: + DBG3("Relayd worker thread polling..."); ret = lttng_poll_wait(&events, -1); if (ret < 0) { /* @@ -1302,15 +1980,23 @@ void *relay_thread_worker(void *data) goto error; } + nb_fd = ret; + + /* + * Process control. The control connection is prioritised so we don't + * starve it with high throughout put tracing data on the data + * connection. + */ for (i = 0; i < nb_fd; i++) { /* Fetch once the poll data */ - revents = LTTNG_POLL_GETEV(&events, i); - pollfd = LTTNG_POLL_GETFD(&events, i); + uint32_t revents = LTTNG_POLL_GETEV(&events, i); + int pollfd = LTTNG_POLL_GETFD(&events, i); /* Thread quit pipe has been closed. Killing thread. */ ret = check_thread_quit_pipe(pollfd, revents); if (ret) { - goto error; + err = 0; + goto exit; } /* Inspect the relay cmd pipe for new connection */ @@ -1326,13 +2012,15 @@ void *relay_thread_worker(void *data) goto error; } } - } else if (revents > 0) { + } else if (revents) { + rcu_read_lock(); lttng_ht_lookup(relay_connections_ht, (void *)((unsigned long) pollfd), &iter); node = lttng_ht_iter_get_node_ulong(&iter); if (node == NULL) { DBG2("Relay sock %d not found", pollfd); + rcu_read_unlock(); goto error; } relay_connection = caa_container_of(node, @@ -1340,84 +2028,171 @@ void *relay_thread_worker(void *data) if (revents & (LPOLLERR)) { ERR("POLL ERROR"); - relay_cleanup_connection(relay_connections_ht, - &events, streams_ht, pollfd, &iter); - free(relay_connection); + relay_cleanup_poll_connection(&events, pollfd); + relay_del_connection(relay_connections_ht, + streams_ht, &iter, + relay_connection); + if (last_seen_data_fd == pollfd) { + last_seen_data_fd = last_notdel_data_fd; + } } else if (revents & (LPOLLHUP | LPOLLRDHUP)) { DBG("Socket %d hung up", pollfd); - relay_cleanup_connection(relay_connections_ht, - &events, streams_ht, pollfd, &iter); - if (relay_connection->type == RELAY_CONTROL) { - relay_delete_session(relay_connection, streams_ht); + relay_cleanup_poll_connection(&events, pollfd); + relay_del_connection(relay_connections_ht, + streams_ht, &iter, + relay_connection); + if (last_seen_data_fd == pollfd) { + last_seen_data_fd = last_notdel_data_fd; } - free(relay_connection); } else if (revents & LPOLLIN) { /* control socket */ if (relay_connection->type == RELAY_CONTROL) { ret = relay_connection->sock->ops->recvmsg( relay_connection->sock, &recv_hdr, - sizeof(struct lttcomm_relayd_hdr), MSG_WAITALL); + sizeof(struct lttcomm_relayd_hdr), 0); /* connection closed */ if (ret <= 0) { - relay_cleanup_connection(relay_connections_ht, - &events, streams_ht, pollfd, &iter); - relay_delete_session(relay_connection, streams_ht); - free(relay_connection); + relay_cleanup_poll_connection(&events, pollfd); + relay_del_connection(relay_connections_ht, + streams_ht, &iter, + relay_connection); DBG("Control connection closed with %d", pollfd); } else { if (relay_connection->session) { - DBG2("Relay worker receiving data for session : %lu", + DBG2("Relay worker receiving data for session : %" PRIu64, relay_connection->session->id); } ret = relay_process_control(&recv_hdr, relay_connection, streams_ht); - /* - * there was an error in processing a control - * command: clear the session - * */ if (ret < 0) { - relay_cleanup_connection(relay_connections_ht, - &events, streams_ht, pollfd, &iter); - free(relay_connection); + /* Clear the session on error. */ + relay_cleanup_poll_connection(&events, pollfd); + relay_del_connection(relay_connections_ht, + streams_ht, &iter, + relay_connection); DBG("Connection closed with %d", pollfd); } + seen_control = 1; } - /* data socket */ - } else if (relay_connection->type == RELAY_DATA) { - ret = relay_process_data(relay_connection, streams_ht); - /* connection closed */ - if (ret < 0) { - relay_cleanup_connection(relay_connections_ht, - &events, streams_ht, pollfd, &iter); - relay_delete_session(relay_connection, streams_ht); - DBG("Data connection closed with %d", pollfd); - } + } else { + /* + * Flag the last seen data fd not deleted. It will be + * used as the last seen fd if any fd gets deleted in + * this first loop. + */ + last_notdel_data_fd = pollfd; } } + rcu_read_unlock(); } } + + /* + * The last loop handled a control request, go back to poll to make + * sure we prioritise the control socket. + */ + if (seen_control) { + continue; + } + + if (last_seen_data_fd >= 0) { + for (i = 0; i < nb_fd; i++) { + int pollfd = LTTNG_POLL_GETFD(&events, i); + if (last_seen_data_fd == pollfd) { + idx = i; + break; + } + } + } + + /* Process data connection. */ + for (i = idx + 1; i < nb_fd; i++) { + /* Fetch the poll data. */ + uint32_t revents = LTTNG_POLL_GETEV(&events, i); + int pollfd = LTTNG_POLL_GETFD(&events, i); + + /* Skip the command pipe. It's handled in the first loop. */ + if (pollfd == relay_cmd_pipe[0]) { + continue; + } + + if (revents) { + rcu_read_lock(); + lttng_ht_lookup(relay_connections_ht, + (void *)((unsigned long) pollfd), + &iter); + node = lttng_ht_iter_get_node_ulong(&iter); + if (node == NULL) { + /* Skip it. Might be removed before. */ + rcu_read_unlock(); + continue; + } + relay_connection = caa_container_of(node, + struct relay_command, sock_n); + + if (revents & LPOLLIN) { + if (relay_connection->type != RELAY_DATA) { + continue; + } + + ret = relay_process_data(relay_connection, streams_ht); + /* connection closed */ + if (ret < 0) { + relay_cleanup_poll_connection(&events, pollfd); + relay_del_connection(relay_connections_ht, + streams_ht, &iter, + relay_connection); + DBG("Data connection closed with %d", pollfd); + /* + * Every goto restart call sets the last seen fd where + * here we don't really care since we gracefully + * continue the loop after the connection is deleted. + */ + } else { + /* Keep last seen port. */ + last_seen_data_fd = pollfd; + rcu_read_unlock(); + goto restart; + } + } + rcu_read_unlock(); + } + } + last_seen_data_fd = -1; } +exit: error: lttng_poll_clean(&events); /* empty the hash table and free the memory */ + rcu_read_lock(); cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter, node, node) { node = lttng_ht_iter_get_node_ulong(&iter); if (node) { relay_connection = caa_container_of(node, struct relay_command, sock_n); - free(relay_connection); + relay_del_connection(relay_connections_ht, + streams_ht, &iter, + relay_connection); } - ret = lttng_ht_del(relay_connections_ht, &iter); - assert(!ret); } + rcu_read_unlock(); error_poll_create: - free(data_buffer); + lttng_ht_destroy(streams_ht); +streams_ht_error: lttng_ht_destroy(relay_connections_ht); +relay_connections_ht_error: + /* Close relay cmd pipes */ + utils_close_pipe(relay_cmd_pipe); + if (err) { + DBG("Thread exited with error"); + } DBG("Worker thread cleanup complete"); + free(data_buffer); stop_threads(); + rcu_unregister_thread(); return NULL; } @@ -1449,7 +2224,7 @@ int main(int argc, char **argv) /* Parse arguments */ progname = argv[0]; - if ((ret = parse_args(argc, argv) < 0)) { + if ((ret = parse_args(argc, argv)) < 0) { goto exit; }