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104 lines
2.6 KiB
104 lines
2.6 KiB
libtraceevent(3) |
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================ |
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NAME |
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---- |
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tep_set_flag, tep_clear_flag, tep_test_flag - |
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Manage flags of trace event parser context. |
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SYNOPSIS |
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-------- |
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[verse] |
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-- |
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*#include <event-parse.h>* |
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enum *tep_flag* { |
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_TEP_NSEC_OUTPUT_, |
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_TEP_DISABLE_SYS_PLUGINS_, |
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_TEP_DISABLE_PLUGINS_ |
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}; |
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void *tep_set_flag*(struct tep_handle pass:[*]_tep_, enum tep_flag _flag_); |
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void *tep_clear_flag*(struct tep_handle pass:[*]_tep_, enum tep_flag _flag_); |
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bool *tep_test_flag*(struct tep_handle pass:[*]_tep_, enum tep_flag _flag_); |
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-- |
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DESCRIPTION |
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----------- |
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Trace event parser context flags are defined in *enum tep_flag*: |
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[verse] |
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-- |
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_TEP_NSEC_OUTPUT_ - print event's timestamp in nano seconds, instead of micro seconds. |
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_TEP_DISABLE_SYS_PLUGINS_ - disable plugins, located in system's plugin |
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directory. This directory is defined at library compile |
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time, and usually depends on library installation |
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prefix: (install_preffix)/lib/traceevent/plugins |
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_TEP_DISABLE_PLUGINS_ - disable all library plugins: |
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- in system's plugin directory |
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- in directory, defined by the environment variable _TRACEEVENT_PLUGIN_DIR_ |
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- in user's home directory, _~/.traceevent/plugins_ |
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-- |
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Note: plugin related flags must me set before calling _tep_load_plugins()_ API. |
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The _tep_set_flag()_ function sets _flag_ to _tep_ context. |
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The _tep_clear_flag()_ function clears _flag_ from _tep_ context. |
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The _tep_test_flag()_ function tests if _flag_ is set to _tep_ context. |
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RETURN VALUE |
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------------ |
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_tep_test_flag()_ function returns true if _flag_ is set, false otherwise. |
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EXAMPLE |
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------- |
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[source,c] |
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-- |
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#include <event-parse.h> |
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... |
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struct tep_handle *tep = tep_alloc(); |
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... |
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/* Print timestamps in nanoseconds */ |
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tep_set_flag(tep, TEP_NSEC_OUTPUT); |
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... |
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if (tep_test_flag(tep, TEP_NSEC_OUTPUT)) { |
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/* print timestamps in nanoseconds */ |
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} else { |
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/* print timestamps in microseconds */ |
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} |
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... |
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/* Print timestamps in microseconds */ |
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tep_clear_flag(tep, TEP_NSEC_OUTPUT); |
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... |
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-- |
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FILES |
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----- |
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[verse] |
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-- |
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*event-parse.h* |
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Header file to include in order to have access to the library APIs. |
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*-ltraceevent* |
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Linker switch to add when building a program that uses the library. |
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-- |
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SEE ALSO |
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-------- |
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_libtraceevent(3)_, _trace-cmd(1)_ |
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AUTHOR |
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------ |
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[verse] |
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-- |
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*Steven Rostedt* <[email protected]>, author of *libtraceevent*. |
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*Tzvetomir Stoyanov* <[email protected]>, author of this man page. |
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-- |
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REPORTING BUGS |
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-------------- |
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Report bugs to <[email protected]> |
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LICENSE |
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------- |
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libtraceevent is Free Software licensed under the GNU LGPL 2.1 |
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RESOURCES |
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--------- |
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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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