projects / lttng-ust.git / blame
| Commit | Line | Data |
|---|---|---|
| 53f7d0d7 MJ |
1 | <!-- |
| 2 | SPDX-FileCopyrightText: 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
| 3 | ||
| 4 | SPDX-License-Identifier: CC-BY-4.0 | |
| 5 | --> | |
| 6 | ||
| eb8246a0 MD |
7 | This is a demo application showing how to trace logging statements into |
| 8 | LTTng-UST. | |
| 9 | ||
| 10 | The simplest commands to trace the demo program are: | |
| 11 | ||
| 53f7d0d7 | 12 | ``` |
| eb8246a0 MD |
13 | lttng create |
| 14 | lttng enable-event -u "lttng_ust_tracelog:*" | |
| 15 | lttng start | |
| 16 | ./demo-tracelog | |
| 17 | lttng stop | |
| 18 | lttng view | |
| 19 | lttng destroy | |
| 53f7d0d7 | 20 | ``` |
| eb8246a0 MD |
21 | |
| 22 | The resulting lttng view output should look like this: | |
| 23 | ||
| 53f7d0d7 | 24 | ``` |
| c4d667ed MD |
25 | [15:54:19.454863179] (+?.?????????) thinkos lttng_ust_tracelog:TRACE_ERR: { cpu_id = 0 }, { line = 45, file = "demo-tracelog.c", func = "main", _msg_length = 17, msg = "Error condition 0" } |
| 26 | [15:54:19.454871660] (+0.000008481) thinkos lttng_ust_tracelog:TRACE_ERR: { cpu_id = 0 }, { line = 45, file = "demo-tracelog.c", func = "main", _msg_length = 17, msg = "Error condition 1" } | |
| 27 | [15:54:19.454872838] (+0.000001178) thinkos lttng_ust_tracelog:TRACE_ERR: { cpu_id = 0 }, { line = 45, file = "demo-tracelog.c", func = "main", _msg_length = 17, msg = "Error condition 2" } | |
| 28 | [15:54:19.454873541] (+0.000000703) thinkos lttng_ust_tracelog:TRACE_ERR: { cpu_id = 0 }, { line = 45, file = "demo-tracelog.c", func = "main", _msg_length = 17, msg = "Error condition 3" } | |
| 29 | [15:54:19.454874283] (+0.000000742) thinkos lttng_ust_tracelog:TRACE_ERR: { cpu_id = 0 }, { line = 45, file = "demo-tracelog.c", func = "main", _msg_length = 17, msg = "Error condition 4" } | |
| 53f7d0d7 | 30 | ``` |