---
name: "tep_set_flag"
section: "3"
platform: "linux"
package: "libtraceevent"
version: "1:1.9.1-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/tep_set_flag"
---

# tep\_set\_flag(3)

Manage flags of trace event parser context.

## NAME

tep\_set\_flag, tep\_clear\_flag, tep\_test\_flag - Manage flags of trace event parser context.

## SYNOPSIS

```
#include <event-parse.h>
enum tep_flag {
        TEP_NSEC_OUTPUT,
        TEP_DISABLE_SYS_PLUGINS,
        TEP_DISABLE_PLUGINS
};
void tep_set_flag(struct tep_handle *tep, enum tep_flag flag);
void tep_clear_flag(struct tep_handle *tep, enum tep_flag flag);
bool tep_test_flag(struct tep_handle *tep, enum tep_flag flag);
```

## DESCRIPTION

Trace event parser context flags are defined in **enum tep\_flag**:

```
TEP_NSEC_OUTPUT - print event’s timestamp in nano seconds, instead of micro seconds.
TEP_DISABLE_SYS_PLUGINS - disable plugins, located in system’s plugin
                        directory. This directory is defined at library compile
                        time, and usually depends on library installation
                        prefix: (install_preffix)/lib/traceevent/plugins
TEP_DISABLE_PLUGINS - disable all library plugins:
                        - in system’s plugin directory
                        - in directory, defined by the environment variable TRACEEVENT_PLUGIN_DIR
                        - in user’s home directory, ~/.traceevent/plugins
```

Note: plugin related flags must me set before calling **tep\_load\_plugins()** API.

The **tep\_set\_flag()** function sets *flag* to *tep* context.

The **tep\_clear\_flag()** function clears *flag* from *tep* context.

The **tep\_test\_flag()** function tests if *flag* is set to *tep* context.

## RETURN VALUE

**tep\_test\_flag()** function returns true if *flag* is set, false otherwise.

## EXAMPLE

```
#include <event-parse.h>
...
struct tep_handle *tep = tep_alloc();
...
/* Print timestamps in nanoseconds */
tep_set_flag(tep,  TEP_NSEC_OUTPUT);
...
if (tep_test_flag(tep, TEP_NSEC_OUTPUT)) {
        /* print timestamps in nanoseconds */
} else {
        /* print timestamps in microseconds */
}
...
/* Print timestamps in microseconds */
tep_clear_flag(tep, TEP_NSEC_OUTPUT);
...
```

## FILES

```
event-parse.h
        Header file to include in order to have access to the library APIs.
-ltraceevent
        Linker switch to add when building a program that uses the library.
```

## SEE ALSO

[**libtraceevent**(3)](/libtraceevent/3.md), [**trace-cmd**(1)](/trace-cmd/1.md)

## AUTHOR

```
Steven Rostedt <rostedt@goodmis.org[1]>, author of libtraceevent.
Tzvetomir Stoyanov <tz.stoyanov@gmail.com[2]>, author of this man page.
```

## REPORTING BUGS

Report bugs to \<**linux-trace-devel@vger.kernel.org**\[3\]\>

## LICENSE

libtraceevent is Free Software licensed under the GNU LGPL 2.1

## RESOURCES

**https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/**

## NOTES

- 1\.

  rostedt@goodmis.org

  mailto:rostedt@goodmis.org

- 2\.

  tz.stoyanov@gmail.com

  mailto:tz.stoyanov@gmail.com

- 3\.

  linux-trace-devel@vger.kernel.org

  mailto:linux-trace-devel@vger.kernel.org