Bug #583: When UST support is disabled, the session creation error message is confusing - LTTng-tools - LTTng bugs repository

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Bug #583

closed

When UST support is disabled, the session creation error message is confusing

Added by Daniel U. Thibault over 11 years ago. Updated over 11 years ago.

Status:

Resolved

Priority:

Low

Assignee:

Target version:

LTTng - 2.2

Start date:

07/03/2013

Due date:

% Done:

100%

Estimated time:

Description

Assume lttng-tools was compiled without UST support:

$ lttng create dutsession
$ lttng -vvv enable-event --all -u
Error: Events: UST create session failed (channel channel0, session dutsession)

The user will be perplexed by "create session failed" since his "create session" command was processed without causing a comparable error. Since sessions can include kernel and user-space events, the user is unlikely to make the distinction between kernel sessions and user-space sessions; in fact, those concepts (the ltt_kernel_session and ltt_ust_session structs) are internal to lttng and are not exposed to the user.

The error message needs to be clearer, something like:

"Error: Events: No UST support available (channel c, session s)"