LIBTRACEEVENT(3)             libtraceevent Manual             LIBTRACEEVENT(3)

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), trace-cmd(1)

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

libtraceevent                     01/13/2024                  LIBTRACEEVENT(3)