Fix: support temporary snapshot max size and name

[lttng-tools.git] / src / bin / lttng-sessiond / cmd.c

diff --git a/src/bin/lttng-sessiond/cmd.c b/src/bin/lttng-sessiond/cmd.c
index c522d51c2dc27e46efa08ccb7f85085e16e4e4d3..6000d198ca2c153b5791e57f7fd4e63f75a47e02 100644 (file)
--- a/src/bin/lttng-sessiond/cmd.c
+++ b/src/bin/lttng-sessiond/cmd.c
@@ -2576,7 +2576,8 @@ int cmd_snapshot_record(struct ltt_session *session,
                struct lttng_snapshot_output *output, int wait)
 {
        int ret = LTTNG_OK;
-       struct snapshot_output *tmp_sout = NULL;
+       unsigned int use_tmp_output = 0;
+       struct snapshot_output tmp_output;
        unsigned int nb_streams;
 
        assert(session);
@@ -2600,15 +2601,9 @@ int cmd_snapshot_record(struct ltt_session *session,
 
        /* Use temporary output for the session. */
        if (output && *output->ctrl_url != '\0') {
-               tmp_sout = snapshot_output_alloc();
-               if (!tmp_sout) {
-                       ret = LTTNG_ERR_NOMEM;
-                       goto error;
-               }
-
                ret = snapshot_output_init(output->max_size, output->name,
                                output->ctrl_url, output->data_url, session->consumer,
-                               tmp_sout, NULL);
+                               &tmp_output, NULL);
                if (ret < 0) {
                        if (ret == -ENOMEM) {
                                ret = LTTNG_ERR_NOMEM;
@@ -2617,6 +2612,7 @@ int cmd_snapshot_record(struct ltt_session *session,
                        }
                        goto error;
                }
+               use_tmp_output = 1;
        }
 
        /*
@@ -2628,8 +2624,8 @@ int cmd_snapshot_record(struct ltt_session *session,
        if (session->kernel_session) {
                struct ltt_kernel_session *ksess = session->kernel_session;
 
-               if (tmp_sout) {
-                       ret = record_kernel_snapshot(ksess, tmp_sout, session,
+               if (use_tmp_output) {
+                       ret = record_kernel_snapshot(ksess, &tmp_output, session,
                                        wait, nb_streams);
                        if (ret < 0) {
                                goto error;
@@ -2641,7 +2637,25 @@ int cmd_snapshot_record(struct ltt_session *session,
                        rcu_read_lock();
                        cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
                                        &iter.iter, sout, node.node) {
-                               ret = record_kernel_snapshot(ksess, sout,
+                               /*
+                                * Make a local copy of the output and assign the possible
+                                * temporary value given by the caller.
+                                */
+                               memset(&tmp_output, 0, sizeof(tmp_output));
+                               memcpy(&tmp_output, sout, sizeof(tmp_output));
+
+                               /* Use temporary max size. */
+                               if (output->max_size != (uint64_t) -1ULL) {
+                                       tmp_output.max_size = output->max_size;
+                               }
+
+                               /* Use temporary name. */
+                               if (*output->name != '\0') {
+                                       strncpy(tmp_output.name, output->name,
+                                                       sizeof(tmp_output.name));
+                               }
+
+                               ret = record_kernel_snapshot(ksess, &tmp_output,
                                                session, wait, nb_streams);
                                if (ret < 0) {
                                        rcu_read_unlock();
@@ -2655,8 +2669,8 @@ int cmd_snapshot_record(struct ltt_session *session,
        if (session->ust_session) {
                struct ltt_ust_session *usess = session->ust_session;
 
-               if (tmp_sout) {
-                       ret = record_ust_snapshot(usess, tmp_sout, session,
+               if (use_tmp_output) {
+                       ret = record_ust_snapshot(usess, &tmp_output, session,
                                        wait, nb_streams);
                        if (ret < 0) {
                                goto error;
@@ -2668,7 +2682,27 @@ int cmd_snapshot_record(struct ltt_session *session,
                        rcu_read_lock();
                        cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
                                        &iter.iter, sout, node.node) {
-                               ret = record_ust_snapshot(usess, sout, session,
+                               /*
+                                * Make a local copy of the output and assign the possible
+                                * temporary value given by the caller.
+                                */
+                               memset(&tmp_output, 0, sizeof(tmp_output));
+                               memcpy(&tmp_output, sout, sizeof(tmp_output));
+
+                               fprintf(stderr, "Name: %s\n", output->name);
+
+                               /* Use temporary max size. */
+                               if (output->max_size != (uint64_t) -1ULL) {
+                                       tmp_output.max_size = output->max_size;
+                               }
+
+                               /* Use temporary name. */
+                               if (*output->name != '\0') {
+                                       strncpy(tmp_output.name, output->name,
+                                                       sizeof(tmp_output.name));
+                               }
+
+                               ret = record_ust_snapshot(usess, &tmp_output, session,
                                                wait, nb_streams);
                                if (ret < 0) {
                                        rcu_read_unlock();
@@ -2680,9 +2714,6 @@ int cmd_snapshot_record(struct ltt_session *session,
        }
 
 error:
-       if (tmp_sout) {
-               snapshot_output_destroy(tmp_sout);
-       }
        return ret;
 }