lttng-trace: a new strace-alike LTTng command

Hi there!

I just pushed a new command line tool named lttng-trace, which allows tracing a specific command and its sub-processes using the LTTng system call tracer. It focuses on simplicity. It can be found here:

Git website: http://git.lttng.org/?p=lttng-trace.git

Clone with:

git clone https://git.lttng.org/lttng-trace.git

For instance, tracing the command "date" is as simple as:

lttng-trace date

The tracing session can be optionally configured by using the usual lttng control interfaces after this message appears:

[lttng-trace] Tracing session date-20210218-170545 created. It can be customized using the lttng command. [lttng-trace] Press <ENTER> key when ready to run the child process.

After execution of the command, the following message details how to view the trace:

[lttng-trace] Sub-process hierarchy traced successfully. View trace with babeltrace2 /tmp/lttng-trace/date-20210218-170906

See lttng-trace --help for more options.

This new command is in early alpha stage. Feedback is welcome! For instance, we are wondering whether the default behavior should just be tracing system calls, or if some level of user-space tracing should be enabled by default as well. Or if some new options should enable "typical" usage scenarios.

Thanks,

Mathieu

Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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