Fix: truncate the metadata file in shm-path

[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 a57afe2c3016be26e9b378d9f42996bbc6cd7545..cc81906b6267ffc104ee357741d0b099af9fbc3c 100644 (file)
--- a/src/bin/lttng-sessiond/cmd.c
+++ b/src/bin/lttng-sessiond/cmd.c
@@ -2748,64 +2748,6 @@ int cmd_destroy_session(struct ltt_session *session, int wpipe)
        return ret;
 }
 
-/*
- * Command LTTNG_CALIBRATE processed by the client thread.
- */
-int cmd_calibrate(enum lttng_domain_type domain,
-               struct lttng_calibrate *calibrate)
-{
-       int ret;
-
-       switch (domain) {
-       case LTTNG_DOMAIN_KERNEL:
-       {
-               struct lttng_kernel_calibrate kcalibrate;
-
-               switch (calibrate->type) {
-               case LTTNG_CALIBRATE_FUNCTION:
-               default:
-                       /* Default and only possible calibrate option. */
-                       kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
-                       break;
-               }
-
-               ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
-               if (ret < 0) {
-                       ret = LTTNG_ERR_KERN_ENABLE_FAIL;
-                       goto error;
-               }
-               break;
-       }
-       case LTTNG_DOMAIN_UST:
-       {
-               struct lttng_ust_calibrate ucalibrate;
-
-               switch (calibrate->type) {
-               case LTTNG_CALIBRATE_FUNCTION:
-               default:
-                       /* Default and only possible calibrate option. */
-                       ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
-                       break;
-               }
-
-               ret = ust_app_calibrate_glb(&ucalibrate);
-               if (ret < 0) {
-                       ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
-                       goto error;
-               }
-               break;
-       }
-       default:
-               ret = LTTNG_ERR_UND;
-               goto error;
-       }
-
-       ret = LTTNG_OK;
-
-error:
-       return ret;
-}
-
 /*
  * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
  */
@@ -3207,11 +3149,10 @@ int cmd_snapshot_add_output(struct ltt_session *session,
        DBG("Cmd snapshot add output for session %s", session->name);
 
        /*
-        * Permission denied to create an output if the session is not
-        * set in no output mode.
+        * Can't create an output if the session is not set in no-output mode.
         */
        if (session->output_traces) {
-               ret = LTTNG_ERR_EPERM;
+               ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION;
                goto error;
        }
 
@@ -3275,7 +3216,7 @@ int cmd_snapshot_del_output(struct ltt_session *session,
         * set in no output mode.
         */
        if (session->output_traces) {
-               ret = LTTNG_ERR_EPERM;
+               ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION;
                goto error;
        }
 
@@ -3327,19 +3268,19 @@ ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
         * set in no output mode.
         */
        if (session->output_traces) {
-               ret = -LTTNG_ERR_EPERM;
-               goto error;
+               ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION;
+               goto end;
        }
 
        if (session->snapshot.nb_output == 0) {
                ret = 0;
-               goto error;
+               goto end;
        }
 
        list = zmalloc(session->snapshot.nb_output * sizeof(*list));
        if (!list) {
                ret = -LTTNG_ERR_NOMEM;
-               goto error;
+               goto end;
        }
 
        /* Copy list from session to the new list object. */
@@ -3385,8 +3326,9 @@ ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
        list = NULL;
        ret = session->snapshot.nb_output;
 error:
-       free(list);
        rcu_read_unlock();
+       free(list);
+end:
        return ret;
 }
 
@@ -3435,6 +3377,27 @@ end:
        return ret;
 }
 
+static
+int clear_metadata_file(int fd)
+{
+       int ret;
+
+       ret = lseek(fd, 0, SEEK_SET);
+       if (ret < 0) {
+               PERROR("lseek");
+               goto end;
+       }
+
+       ret = ftruncate(fd, 0);
+       if (ret < 0) {
+               PERROR("ftruncate");
+               goto end;
+       }
+
+end:
+       return ret;
+}
+
 static
 int ust_regenerate_metadata(struct ltt_ust_session *usess)
 {
@@ -3456,6 +3419,15 @@ int ust_regenerate_metadata(struct ltt_ust_session *usess)
                memset(registry->metadata, 0, registry->metadata_alloc_len);
                registry->metadata_len = 0;
                registry->metadata_version++;
+               if (registry->metadata_fd > 0) {
+                       /* Clear the metadata file's content. */
+                       ret = clear_metadata_file(registry->metadata_fd);
+                       if (ret) {
+                               pthread_mutex_unlock(&registry->lock);
+                               goto end;
+                       }
+               }
+
                ret = ust_metadata_session_statedump(registry, NULL,
                                registry->major, registry->minor);
                if (ret) {
@@ -3860,7 +3832,7 @@ int cmd_snapshot_record(struct ltt_session *session,
         * set in no output mode.
         */
        if (session->output_traces) {
-               ret = LTTNG_ERR_EPERM;
+               ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION;
                goto error;
        }