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PROGRAM:

NAME


lttng-gen-tp — LTTng UST 2.x tracepoint code generator

SYNOPSIS


lttng-gen-tp [OPTIONS] TEMPLATE_FILE

DESCRIPTION


The LTTng project aims at providing highly efficient tracing tools for Linux. Its tracers
help in tracking down performance issues and debugging problems involving multiple
concurrent processes and threads. Tracing across multiple systems is also possible.

The lttng-gen-tp tool simplifies the generation of the UST tracepoint files. It takes a
simple template file and generates the necessary code to use the defined tracepoints in
your application. The section TEMPLATE FILE FORMAT describes the content of the template
file.

Currently, the tool can generate the .h, .c and .o associated with your tracepoint. The
generated .h can be directly included in your application. You can let the tool generate
the .o or compile the .c yourself. You can compile the .c into a .o, .a or .so at your
choice and link it with your application. Refer to the UST documentation for the
advantages and disadvantage of each form. To compile the resulting .c file, you need to
add the options "-llttng-ust -I.".

OPTIONS


This program follows the usual GNU command line syntax with long options starting with two
dashes. Below is a summary of the available options.

-h, --help
Show summary of possible options and commands.

-v, --verbose
Increase verbosity.

-o, --output
Specify the generated file. The type of the generated file depend on the file
extension (.h, .c, .o). This option can be specified multiple times to generate
different file type.

When no output is specified the default files are generated with the same base filename as
the template file. The default files are: .h, .c, .o.

TEMPLATE FILE FORMAT


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

You write them as you would write them in a C header file. You can add comments with /*
*/, // and #.

The provider name (the first field of TRACEPOINT_EVENT) must be the same for the whole
file.

Example

TRACEPOINT_EVENT(
sample_tracepoint,
message, // Comment
TP_ARGS(char *, text),
/* Next are the fields */
TP_FIELDS(
ctf_string(message, text)
)
)

ENVIRONMENT VARIABLES


When the tool generates a .o file, it will look for the following environment variables

CC Specify which C compiler to use. If the variable is not specified, the tool will
try "cc" and "gcc"

CFLAGS Flags directly passed to the compiler

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