table of contents
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¶
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
08/31/2024 | libtraceevent 1.8.3 |