From: Mathieu Desnoyers Date: Mon, 5 Jan 2015 21:43:05 +0000 (-0500) Subject: Fix: compat poll: add missing empty revents checks X-Git-Tag: v2.6.0~25 X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=e0077699b76df46411a6ec0426a31005b2407497;p=lttng-tools.git Fix: compat poll: add missing empty revents checks Poll returns the entire array, including entries that have no activity. We need to check them explicitly. Fixes #747 Signed-off-by: Mathieu Desnoyers Signed-off-by: Jérémie Galarneau Conflicts: src/bin/lttng-sessiond/ht-cleanup.c --- diff --git a/src/bin/lttng-consumerd/health-consumerd.c b/src/bin/lttng-consumerd/health-consumerd.c index d1478e54d..e8afd963f 100644 --- a/src/bin/lttng-consumerd/health-consumerd.c +++ b/src/bin/lttng-consumerd/health-consumerd.c @@ -260,6 +260,11 @@ restart: revents = LTTNG_POLL_GETEV(&events, i); pollfd = LTTNG_POLL_GETFD(&events, i); + if (!revents) { + /* No activity for this FD (poll implementation). */ + continue; + } + /* Thread quit pipe has been closed. Killing thread. */ ret = check_health_quit_pipe(pollfd, revents); if (ret) { diff --git a/src/bin/lttng-relayd/health-relayd.c b/src/bin/lttng-relayd/health-relayd.c index 8194c3e4b..402b44277 100644 --- a/src/bin/lttng-relayd/health-relayd.c +++ b/src/bin/lttng-relayd/health-relayd.c @@ -329,6 +329,11 @@ restart: revents = LTTNG_POLL_GETEV(&events, i); pollfd = LTTNG_POLL_GETFD(&events, i); + if (!revents) { + /* No activity for this FD (poll implementation). */ + continue; + } + /* Thread quit pipe has been closed. Killing thread. */ ret = check_health_quit_pipe(pollfd, revents); if (ret) { diff --git a/src/bin/lttng-relayd/live.c b/src/bin/lttng-relayd/live.c index cb1c6f80b..6c3e94f27 100644 --- a/src/bin/lttng-relayd/live.c +++ b/src/bin/lttng-relayd/live.c @@ -515,6 +515,11 @@ restart: revents = LTTNG_POLL_GETEV(&events, i); pollfd = LTTNG_POLL_GETFD(&events, i); + if (!revents) { + /* No activity for this FD (poll implementation). */ + continue; + } + /* Thread quit pipe has been closed. Killing thread. */ ret = check_thread_quit_pipe(pollfd, revents); if (ret) { @@ -1950,6 +1955,11 @@ restart: health_code_update(); + if (!revents) { + /* No activity for this FD (poll implementation). */ + continue; + } + /* Thread quit pipe has been closed. Killing thread. */ ret = check_thread_quit_pipe(pollfd, revents); if (ret) { diff --git a/src/bin/lttng-relayd/main.c b/src/bin/lttng-relayd/main.c index 0fad1264a..2e3955d68 100644 --- a/src/bin/lttng-relayd/main.c +++ b/src/bin/lttng-relayd/main.c @@ -834,6 +834,11 @@ restart: revents = LTTNG_POLL_GETEV(&events, i); pollfd = LTTNG_POLL_GETFD(&events, i); + if (!revents) { + /* No activity for this FD (poll implementation). */ + continue; + } + /* Thread quit pipe has been closed. Killing thread. */ ret = check_thread_quit_pipe(pollfd, revents); if (ret) { @@ -2502,6 +2507,11 @@ restart: health_code_update(); + if (!revents) { + /* No activity for this FD (poll implementation). */ + continue; + } + /* Thread quit pipe has been closed. Killing thread. */ ret = check_thread_quit_pipe(pollfd, revents); if (ret) { @@ -2604,46 +2614,49 @@ restart: health_code_update(); + if (!revents) { + /* No activity for this FD (poll implementation). */ + continue; + } + /* Skip the command pipe. It's handled in the first loop. */ if (pollfd == relay_conn_pipe[0]) { continue; } - if (revents) { - rcu_read_lock(); - conn = connection_find_by_sock(relay_connections_ht, pollfd); - if (!conn) { - /* Skip it. Might be removed before. */ + rcu_read_lock(); + conn = connection_find_by_sock(relay_connections_ht, pollfd); + if (!conn) { + /* Skip it. Might be removed before. */ + rcu_read_unlock(); + continue; + } + + if (revents & LPOLLIN) { + if (conn->type != RELAY_DATA) { rcu_read_unlock(); continue; } - if (revents & LPOLLIN) { - if (conn->type != RELAY_DATA) { - rcu_read_unlock(); - continue; - } - - ret = relay_process_data(conn); - /* Connection closed */ - if (ret < 0) { - cleanup_connection_pollfd(&events, pollfd); - destroy_connection(relay_connections_ht, conn); - 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; - } + ret = relay_process_data(conn); + /* Connection closed */ + if (ret < 0) { + cleanup_connection_pollfd(&events, pollfd); + destroy_connection(relay_connections_ht, conn); + 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(); } + rcu_read_unlock(); } last_seen_data_fd = -1; } diff --git a/src/bin/lttng-sessiond/agent-thread.c b/src/bin/lttng-sessiond/agent-thread.c index 2c018e9c6..274b94998 100644 --- a/src/bin/lttng-sessiond/agent-thread.c +++ b/src/bin/lttng-sessiond/agent-thread.c @@ -329,6 +329,11 @@ restart: revents = LTTNG_POLL_GETEV(&events, i); pollfd = LTTNG_POLL_GETFD(&events, i); + if (!revents) { + /* No activity for this FD (poll implementation). */ + continue; + } + /* Thread quit pipe has been closed. Killing thread. */ ret = sessiond_check_thread_quit_pipe(pollfd, revents); if (ret) { diff --git a/src/bin/lttng-sessiond/ht-cleanup.c b/src/bin/lttng-sessiond/ht-cleanup.c index a201506c0..f343d620b 100644 --- a/src/bin/lttng-sessiond/ht-cleanup.c +++ b/src/bin/lttng-sessiond/ht-cleanup.c @@ -89,6 +89,14 @@ restart: revents = LTTNG_POLL_GETEV(&events, i); pollfd = LTTNG_POLL_GETFD(&events, i); + if (!revents) { + /* + * No activity for this FD + * (poll implementation). + */ + continue; + } + /* Thread quit pipe has been closed. Killing thread. */ ret = sessiond_check_thread_quit_pipe(pollfd, revents); if (ret) { diff --git a/src/bin/lttng-sessiond/main.c b/src/bin/lttng-sessiond/main.c index 4ea6d1a77..27dc98188 100644 --- a/src/bin/lttng-sessiond/main.c +++ b/src/bin/lttng-sessiond/main.c @@ -1033,6 +1033,11 @@ static void *thread_manage_kernel(void *data) health_code_update(); + if (!revents) { + /* No activity for this FD (poll implementation). */ + continue; + } + /* Thread quit pipe has been closed. Killing thread. */ ret = sessiond_check_thread_quit_pipe(pollfd, revents); if (ret) { @@ -1178,6 +1183,11 @@ restart: health_code_update(); + if (!revents) { + /* No activity for this FD (poll implementation). */ + continue; + } + /* Thread quit pipe has been closed. Killing thread. */ ret = sessiond_check_thread_quit_pipe(pollfd, revents); if (ret) { @@ -1305,6 +1315,11 @@ restart_poll: health_code_update(); + if (!revents) { + /* No activity for this FD (poll implementation). */ + continue; + } + /* * Thread quit pipe has been triggered, flag that we should stop * but continue the current loop to handle potential data from @@ -1481,6 +1496,11 @@ static void *thread_manage_apps(void *data) health_code_update(); + if (!revents) { + /* No activity for this FD (poll implementation). */ + continue; + } + /* Thread quit pipe has been closed. Killing thread. */ ret = sessiond_check_thread_quit_pipe(pollfd, revents); if (ret) { @@ -1659,6 +1679,11 @@ static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue) uint32_t revents = LTTNG_POLL_GETEV(&events, i); int pollfd = LTTNG_POLL_GETFD(&events, i); + if (!revents) { + /* No activity for this FD (poll implementation). */ + continue; + } + cds_list_for_each_entry_safe(wait_node, tmp_wait_node, &wait_queue->head, head) { if (pollfd == wait_node->app->sock && @@ -1998,6 +2023,11 @@ static void *thread_registration_apps(void *data) revents = LTTNG_POLL_GETEV(&events, i); pollfd = LTTNG_POLL_GETFD(&events, i); + if (!revents) { + /* No activity for this FD (poll implementation). */ + continue; + } + /* Thread quit pipe has been closed. Killing thread. */ ret = sessiond_check_thread_quit_pipe(pollfd, revents); if (ret) { @@ -3855,6 +3885,11 @@ restart: revents = LTTNG_POLL_GETEV(&events, i); pollfd = LTTNG_POLL_GETFD(&events, i); + if (!revents) { + /* No activity for this FD (poll implementation). */ + continue; + } + /* Thread quit pipe has been closed. Killing thread. */ ret = sessiond_check_thread_quit_pipe(pollfd, revents); if (ret) { @@ -4027,6 +4062,11 @@ static void *thread_manage_clients(void *data) health_code_update(); + if (!revents) { + /* No activity for this FD (poll implementation). */ + continue; + } + /* Thread quit pipe has been closed. Killing thread. */ ret = sessiond_check_thread_quit_pipe(pollfd, revents); if (ret) { diff --git a/src/bin/lttng-sessiond/ust-thread.c b/src/bin/lttng-sessiond/ust-thread.c index 080afa53a..d0ea32480 100644 --- a/src/bin/lttng-sessiond/ust-thread.c +++ b/src/bin/lttng-sessiond/ust-thread.c @@ -91,6 +91,11 @@ restart: revents = LTTNG_POLL_GETEV(&events, i); pollfd = LTTNG_POLL_GETFD(&events, i); + if (!revents) { + /* No activity for this FD (poll implementation). */ + continue; + } + /* Thread quit pipe has been closed. Killing thread. */ ret = sessiond_check_thread_quit_pipe(pollfd, revents); if (ret) { diff --git a/src/common/consumer.c b/src/common/consumer.c index 8bac35e7d..72c5f3426 100644 --- a/src/common/consumer.c +++ b/src/common/consumer.c @@ -2211,6 +2211,11 @@ restart: revents = LTTNG_POLL_GETEV(&events, i); pollfd = LTTNG_POLL_GETFD(&events, i); + if (!revents) { + /* No activity for this FD (poll implementation). */ + continue; + } + if (pollfd == lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)) { if (revents & (LPOLLERR | LPOLLHUP )) { DBG("Metadata thread pipe hung up"); @@ -2781,10 +2786,11 @@ restart: revents = LTTNG_POLL_GETEV(&events, i); pollfd = LTTNG_POLL_GETFD(&events, i); - /* Just don't waste time if no returned events for the fd */ if (!revents) { + /* No activity for this FD (poll implementation). */ continue; } + if (pollfd == ctx->consumer_channel_pipe[0]) { if (revents & (LPOLLERR | LPOLLHUP)) { DBG("Channel thread pipe hung up");