Fix: use the poll wait ret value when iterating on fd(s)

Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: David Goulet <dgoulet@efficios.com>

diff --git a/src/bin/lttng-relayd/main.c b/src/bin/lttng-relayd/main.c
index 204207d21822bba38e9feb41fe7f64eadfd4ca96..41afccabdfa33b7e045b38a57a825d4d6246ab4b 100644 (file)
--- a/src/bin/lttng-relayd/main.c
+++ b/src/bin/lttng-relayd/main.c
@@ -514,11 +514,6 @@ void *relay_thread_listener(void *data)
        while (1) {
                DBG("Listener accepting connections");
 
-               /* Zeroed the events structure */
-               lttng_poll_reset(&events);
-
-               nb_fd = LTTNG_POLL_GETNB(&events);
-
 restart:
                ret = lttng_poll_wait(&events, -1);
                if (ret < 0) {
@@ -531,6 +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 */
@@ -1877,11 +1874,6 @@ void *relay_thread_worker(void *data)
        }
 
        while (1) {
-               /* Zeroed the events structure */
-               lttng_poll_reset(&events);
-
-               nb_fd = LTTNG_POLL_GETNB(&events);
-
                /* Infinite blocking call, waiting for transmission */
        restart:
                DBG3("Relayd worker thread polling...");
@@ -1896,6 +1888,8 @@ void *relay_thread_worker(void *data)
                        goto error;
                }
 
+               nb_fd = ret;
+
                for (i = 0; i < nb_fd; i++) {
                        /* Fetch once the poll data */
                        revents = LTTNG_POLL_GETEV(&events, i);

diff --git a/src/bin/lttng-sessiond/main.c b/src/bin/lttng-sessiond/main.c
index 7e9f9dc643b3c3f97fa52f261f47f14c11bff9a7..f2cf2856a215d51406c8468f2fb1842b9c306067 100644 (file)
--- a/src/bin/lttng-sessiond/main.c
+++ b/src/bin/lttng-sessiond/main.c
@@ -728,12 +728,7 @@ static void *thread_manage_kernel(void *data)
                        update_poll_flag = 0;
                }
 
-               nb_fd = LTTNG_POLL_GETNB(&events);
-
-               DBG("Thread kernel polling on %d fds", nb_fd);
-
-               /* Zeroed the poll events */
-               lttng_poll_reset(&events);
+               DBG("Thread kernel polling on %d fds", events.nb_fd);
 
                /* Poll infinite value of time */
        restart:
@@ -755,6 +750,8 @@ static void *thread_manage_kernel(void *data)
                        continue;
                }
 
+               nb_fd = ret;
+
                for (i = 0; i < nb_fd; i++) {
                        /* Fetch once the poll data */
                        revents = LTTNG_POLL_GETEV(&events, i);
@@ -886,8 +883,6 @@ static void *thread_manage_consumer(void *data)
                goto error;
        }
 
-       nb_fd = LTTNG_POLL_GETNB(&events);
-
        health_code_update(&consumer_data->health);
 
        /* Inifinite blocking call, waiting for transmission */
@@ -910,6 +905,8 @@ restart:
                goto error;
        }
 
+       nb_fd = ret;
+
        for (i = 0; i < nb_fd; i++) {
                /* Fetch once the poll data */
                revents = LTTNG_POLL_GETEV(&events, i);
@@ -987,9 +984,6 @@ restart:
 
        health_code_update(&consumer_data->health);
 
-       /* Update number of fd */
-       nb_fd = LTTNG_POLL_GETNB(&events);
-
        /* Inifinite blocking call, waiting for transmission */
 restart_poll:
        health_poll_update(&consumer_data->health);
@@ -1005,6 +999,8 @@ restart_poll:
                goto error;
        }
 
+       nb_fd = ret;
+
        for (i = 0; i < nb_fd; i++) {
                /* Fetch once the poll data */
                revents = LTTNG_POLL_GETEV(&events, i);
@@ -1126,12 +1122,7 @@ static void *thread_manage_apps(void *data)
        health_code_update(&health_thread_app_manage);
 
        while (1) {
-               /* Zeroed the events structure */
-               lttng_poll_reset(&events);
-
-               nb_fd = LTTNG_POLL_GETNB(&events);
-
-               DBG("Apps thread polling on %d fds", nb_fd);
+               DBG("Apps thread polling on %d fds", events.nb_fd);
 
                /* Inifinite blocking call, waiting for transmission */
        restart:
@@ -1148,6 +1139,8 @@ static void *thread_manage_apps(void *data)
                        goto error;
                }
 
+               nb_fd = ret;
+
                for (i = 0; i < nb_fd; i++) {
                        /* Fetch once the poll data */
                        revents = LTTNG_POLL_GETEV(&events, i);
@@ -1405,8 +1398,6 @@ static void *thread_registration_apps(void *data)
        while (1) {
                DBG("Accepting application registration");
 
-               nb_fd = LTTNG_POLL_GETNB(&events);
-
                /* Inifinite blocking call, waiting for transmission */
        restart:
                health_poll_update(&health_thread_app_reg);
@@ -1422,6 +1413,8 @@ static void *thread_registration_apps(void *data)
                        goto error;
                }
 
+               nb_fd = ret;
+
                for (i = 0; i < nb_fd; i++) {
                        health_code_update(&health_thread_app_reg);
 
@@ -2982,8 +2975,6 @@ static void *thread_manage_health(void *data)
        while (1) {
                DBG("Health check ready");
 
-               nb_fd = LTTNG_POLL_GETNB(&events);
-
                /* Inifinite blocking call, waiting for transmission */
 restart:
                ret = lttng_poll_wait(&events, -1);
@@ -2997,6 +2988,8 @@ restart:
                        goto error;
                }
 
+               nb_fd = ret;
+
                for (i = 0; i < nb_fd; i++) {
                        /* Fetch once the poll data */
                        revents = LTTNG_POLL_GETEV(&events, i);
@@ -3181,8 +3174,6 @@ static void *thread_manage_clients(void *data)
        while (1) {
                DBG("Accepting client command ...");
 
-               nb_fd = LTTNG_POLL_GETNB(&events);
-
                /* Inifinite blocking call, waiting for transmission */
        restart:
                health_poll_update(&health_thread_cmd);
@@ -3198,6 +3189,8 @@ static void *thread_manage_clients(void *data)
                        goto error;
                }
 
+               nb_fd = ret;
+
                for (i = 0; i < nb_fd; i++) {
                        /* Fetch once the poll data */
                        revents = LTTNG_POLL_GETEV(&events, i);

diff --git a/src/common/consumer.c b/src/common/consumer.c
index 16521a8b863788fd957b756d7c4882f6b3c5abbd..0df073523e5361e09050c7b8dcd8f47bfdd09e2a 100644 (file)
--- a/src/common/consumer.c
+++ b/src/common/consumer.c
@@ -2101,17 +2101,13 @@ void *consumer_thread_metadata_poll(void *data)
        DBG("Metadata main loop started");
 
        while (1) {
-               lttng_poll_reset(&events);
-
-               nb_fd = LTTNG_POLL_GETNB(&events);
-
                /* Only the metadata pipe is set */
-               if (nb_fd == 0 && consumer_quit == 1) {
+               if (events.nb_fd == 0 && consumer_quit == 1) {
                        goto end;
                }
 
 restart:
-               DBG("Metadata poll wait with %d fd(s)", nb_fd);
+               DBG("Metadata poll wait with %d fd(s)", events.nb_fd);
                ret = lttng_poll_wait(&events, -1);
                DBG("Metadata event catched in thread");
                if (ret < 0) {
@@ -2122,6 +2118,8 @@ restart:
                        goto error;
                }
 
+               nb_fd = ret;
+
                /* From here, the event is a metadata wait fd */
                for (i = 0; i < nb_fd; i++) {
                        revents = LTTNG_POLL_GETEV(&events, i);