lttng-gen-tp

NAME

lttng-gen-tp - Generate LTTng-UST tracepoint provider code

SYNOPSIS

lttng-gen-tp [--verbose] [--output=FILE.c]
             [ --output=FILE.h] [--output=FILE.o] TEMPLATE

The lttng-gen-tp tool simplifies the generation of LTTng-UST tracepoint provider files. It takes a simple template file, TEMPLATE, and generates the necessary C code to use the defined tracepoints in your application. See the Template file format section below for more information about the format of TEMPLATE.

Currently, lttng-gen-tp can generate the .h, .c, and .o files associated with your tracepoint provider. The generated .h file can be included directly in your application. You can let lttng-gen-tp generate the .o file or compile the .c file yourself. See lttng-ust(3) for more information about compiling LTTng-UST tracepoint providers.

By default, lttng-gen-tp generates the .h, .c, and .o files, their basename being the basename of TEMPLATE. You can generate one or more specific file types with the --output option, repeated if needed.

Template file format

The template file, which usually has the .tp extension, contains a list of LTTNG_UST_TRACEPOINT_EVENT() definitions and other optional definition entries, like LTTNG_UST_TRACEPOINT_LOGLEVEL(). See lttng-ust(3) for the complete list of available definitions.

The LTTNG_UST_TRACEPOINT_EVENT() definitions are written as you would write them in an LTTng-UST template provider header file. C comments are supported ( /* */ and //), as well as lines starting with #.

Note

The provider name (the first argument of LTTNG_UST_TRACEPOINT_EVENT()) must be the same in all the LTTNG_UST_TRACEPOINT_EVENT() macros of TEMPLATE.

Here’s an example:

LTTNG_UST_TRACEPOINT_EVENT(
    // Tracepoint provider name
    my_provider,

    // Tracepoint/event name
    my_event,

    // Tracepoint arguments (input)
    LTTNG_UST_TP_ARGS(char *, text),

    // Tracepoint/event fields (output)
    LTTNG_UST_TP_FIELDS(
        lttng_ust_field_string(message, text)
    )
)

OPTIONS

-o, --output=FILE

Do not generate default files: generate FILE.

The extension of FILE determines what is generated, amongst .h, .c, and .o. This option can be used more than one time to generate different file types.

-v, --verbose

Increase verbosity.

-h, --help

Show command help.

ENVIRONMENT VARIABLES

C compiler to use. Default: cc, then gcc if cc is not found. This option is only relevant when generating the .o file.

CFLAGS

Flags and options passed directly to the compiler ( $CC). This option is only relevant when generating the .o file.

EXIT STATUS

Success

Non-zero

Error

BUGS

If you encounter any issue or usability problem, please report it on the LTTng bug tracker <https://bugs.lttng.org/projects/lttng-ust>.

RESOURCES

•LTTng project website <http://lttng.org>

•LTTng documentation <http://lttng.org/docs>

•Git repositories <http://git.lttng.org>

•GitHub organization <http://github.com/lttng>

•Continuous integration <http://ci.lttng.org/>

•Mailing list <http://lists.lttng.org> for support and development: [email protected]

•IRC channel <irc://irc.oftc.net/lttng>: #lttng on irc.oftc.net

COPYRIGHTS

lttng-gen-tp is part of the LTTng-UST project.

lttng-gen-tp is distributed under the GNU General Public License, version 2 <http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html>. See the for more details.

AUTHOR

lttng-gen-tp was originally written by Yannick Brosseau <mailto:[email protected]>. It is currently maintained by Mathieu Desnoyers <mailto:[email protected]>.