| LIBTRACEEVENT(3) | libtraceevent Manual | LIBTRACEEVENT(3) |
tep_set_flag, tep_clear_flag, tep_test_flag - Manage flags of trace event parser context.
#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);
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.
tep_test_flag() function returns true if flag is set, false otherwise.
#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);
...
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.
Steven Rostedt <rostedt@goodmis.org[1]>, author of libtraceevent. Tzvetomir Stoyanov <tz.stoyanov@gmail.com[2]>, author of this man page.
Report bugs to <linux-trace-devel@vger.kernel.org[3]>
libtraceevent is Free Software licensed under the GNU LGPL 2.1
https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
| 02/15/2021 | libtraceevent 1.1.2 |