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<body class="manpage">
<div id="header">
<h1>
libtraceevent(3) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>libtraceevent -
Linux kernel trace event library
</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="verseblock">
<pre class="content"><strong>#include <event-parse.h></strong>
Management of tep handler data structure and access of its members:
struct tep_handle *<strong>tep_alloc</strong>(void);
void <strong>tep_free</strong>(struct tep_handle *<em>tep</em>);
void <strong>tep_ref</strong>(struct tep_handle *<em>tep</em>);
void <strong>tep_unref</strong>(struct tep_handle *<em>tep</em>);
int <strong>tep_get_ref</strong>(struct tep_handle *<em>tep</em>);
void <strong>tep_set_flag</strong>(struct tep_handle *<em>tep</em>, enum tep_flag <em>flag</em>);
void <strong>tep_clear_flag</strong>(struct tep_handle *<em>tep</em>, enum tep_flag <em>flag</em>);
bool <strong>tep_test_flag</strong>(struct tep_handle *<em>tep</em>, enum tep_flag <em>flags</em>);
int <strong>tep_get_cpus</strong>(struct tep_handle *<em>tep</em>);
void <strong>tep_set_cpus</strong>(struct tep_handle *<em>tep</em>, int <em>cpus</em>);
int <strong>tep_get_long_size</strong>(strucqt tep_handle *<em>tep</em>);
void <strong>tep_set_long_size</strong>(struct tep_handle *<em>tep</em>, int <em>long_size</em>);
int <strong>tep_get_page_size</strong>(struct tep_handle *<em>tep</em>);
void <strong>tep_set_page_size</strong>(struct tep_handle *<em>tep</em>, int <em>page_size</em>);
int <strong>tep_get_header_page_size</strong>(struct tep_handle *<em>tep</em>);
int <strong>tep_get_header_timestamp_size</strong>(struct tep_handle *<em>tep</em>);
bool <strong>tep_is_old_format</strong>(struct tep_handle *<em>tep</em>);
int <strong>tep_strerror</strong>(struct tep_handle *<em>tep</em>, enum tep_errno <em>errnum</em>, char *<em>buf</em>, size_t <em>buflen</em>);
Register / unregister APIs:
int <strong>tep_register_function</strong>(struct tep_handle *<em>tep</em>, char *<em>name</em>, unsigned long long <em>addr</em>, char *<em>mod</em>);
int <strong>tep_register_event_handler</strong>(struct tep_handle *<em>tep</em>, int <em>id</em>, const char *<em>sys_name</em>, const char *<em>event_name</em>, tep_event_handler_func <em>func</em>, void *<em>context</em>);
int <strong>tep_unregister_event_handler</strong>(struct tep_handle *tep, int id, const char *sys_name, const char *event_name, tep_event_handler_func func, void *<em>context</em>);
int <strong>tep_register_print_string</strong>(struct tep_handle *<em>tep</em>, const char *<em>fmt</em>, unsigned long long <em>addr</em>);
int <strong>tep_register_print_function</strong>(struct tep_handle *<em>tep</em>, tep_func_handler <em>func</em>, enum tep_func_arg_type <em>ret_type</em>, char *<em>name</em>, <em>…</em>);
int <strong>tep_unregister_print_function</strong>(struct tep_handle *<em>tep</em>, tep_func_handler <em>func</em>, char *<em>name</em>);
Plugins management:
struct tep_plugin_list *<strong>tep_load_plugins</strong>(struct tep_handle *<em>tep</em>);
void <strong>tep_unload_plugins</strong>(struct tep_plugin_list *<em>plugin_list</em>, struct tep_handle *<em>tep</em>);
char **<strong>tep_plugin_list_options</strong>(void);
void <strong>tep_plugin_free_options_list</strong>(char **<em>list</em>);
int <strong>tep_plugin_add_options</strong>(const char *<em>name</em>, struct tep_plugin_option *<em>options</em>);
void <strong>tep_plugin_remove_options</strong>(struct tep_plugin_option *<em>options</em>);
void <strong>tep_print_plugins</strong>(struct trace_seq *<em>s</em>, const char *<em>prefix</em>, const char *<em>suffix</em>, const struct tep_plugin_list *<em>list</em>);
Event related APIs:
struct tep_event *<strong>tep_get_event</strong>(struct tep_handle *<em>tep</em>, int <em>index</em>);
struct tep_event *<strong>tep_get_first_event</strong>(struct tep_handle *<em>tep</em>);
int <strong>tep_get_events_count</strong>(struct tep_handle *<em>tep</em>);
struct tep_event **<strong>tep_list_events</strong>(struct tep_handle *<em>tep</em>, enum tep_event_sort_type <em>sort_type</em>);
struct tep_event **<strong>tep_list_events_copy</strong>(struct tep_handle *<em>tep</em>, enum tep_event_sort_type <em>sort_type</em>);
void <strong>tep_print_event</strong>(struct tep_handle *<em>tep</em>, struct trace_seq *<em>s</em>, struct tep_record *<em>record</em>, const char *<em>fmt</em>, <em>…</em>);
Event finding:
struct tep_event *<strong>tep_find_event</strong>(struct tep_handle *<em>tep</em>, int <em>id</em>);
struct tep_event *<strong>tep_find_event_by_name</strong>(struct tep_handle *<em>tep</em>, const char *<em>sys</em>, const char *<em>name</em>);
struct tep_event *<strong>tep_find_event_by_record</strong>(struct tep_handle *<em>tep</em>, struct tep_record *<em>record</em>);
Parsing of event files:
int <strong>tep_parse_header_page</strong>(struct tep_handle *<em>tep</em>, char *<em>buf</em>, unsigned long <em>size</em>, int <em>long_size</em>);
enum tep_errno <strong>tep_parse_event</strong>(struct tep_handle *<em>tep</em>, const char *<em>buf</em>, unsigned long <em>size</em>, const char *<em>sys</em>);
enum tep_errno <strong>tep_parse_format</strong>(struct tep_handle *<em>tep</em>, struct tep_event **<em>eventp</em>, const char *<em>buf</em>, unsigned long <em>size</em>, const char *<em>sys</em>);
APIs related to fields from event’s format files:
struct tep_format_field **<strong>tep_event_common_fields</strong>(struct tep_event *<em>event</em>);
struct tep_format_field **<strong>tep_event_fields</strong>(struct tep_event *<em>event</em>);
void *<strong>tep_get_field_raw</strong>(struct trace_seq *<em>s</em>, struct tep_event *<em>event</em>, const char *<em>name</em>, struct tep_record *<em>record</em>, int *<em>len</em>, int <em>err</em>);
int <strong>tep_get_field_val</strong>(struct trace_seq *<em>s</em>, struct tep_event *<em>event</em>, const char *<em>name</em>, struct tep_record *<em>record</em>, unsigned long long *<em>val</em>, int <em>err</em>);
int <strong>tep_get_common_field_val</strong>(struct trace_seq *<em>s</em>, struct tep_event *<em>event</em>, const char *<em>name</em>, struct tep_record *<em>record</em>, unsigned long long *<em>val</em>, int <em>err</em>);
int <strong>tep_get_any_field_val</strong>(struct trace_seq *<em>s</em>, struct tep_event *<em>event</em>, const char *<em>name</em>, struct tep_record *<em>record</em>, unsigned long long *<em>val</em>, int <em>err</em>);
int <strong>tep_read_number_field</strong>(struct tep_format_field *<em>field</em>, const void *<em>data</em>, unsigned long long *<em>value</em>);
Event fields printing:
void <strong>tep_print_field_content</strong>(struct trace_seq *<em>s</em>, void *<em>data</em>, int size, struct tep_format_field *<em>field</em>);
void <strong>tep_print_fields</strong>(struct trace_seq *<em>s</em>, void *<em>data</em>, int <em>size</em>, struct tep_event *<em>event</em>);
int <strong>tep_print_num_field</strong>(struct trace_seq *<em>s</em>, const char *<em>fmt</em>, struct tep_event *<em>event</em>, const char *<em>name</em>, struct tep_record *<em>record</em>, int <em>err</em>);
int <strong>tep_print_func_field</strong>(struct trace_seq *<em>s</em>, const char *<em>fmt</em>, struct tep_event *<em>event</em>, const char *<em>name</em>, struct tep_record *<em>record</em>, int <em>err</em>);
void <strong>tep_record_print_fields</strong>(struct trace_seq *<em>s</em>, struct tep_record *<em>record</em>, struct tep_event *<em>event</em>);
void <strong>tep_record_print_selected_fields</strong>(struct trace_seq *<em>s</em>, struct tep_record *<em>record</em>, struct tep_event *<em>event</em>, int <em>select_mask</em>);
Event fields finding:
struct tep_format_field *<strong>tep_find_common_field</strong>(struct tep_event *<em>event</em>, const char *<em>name</em>);
struct tep_format_field *<strong>tep_find_field</strong>(struct tep_event_ormat *<em>event</em>, const char *<em>name</em>);
struct tep_format_field *<strong>tep_find_any_field</strong>(struct tep_event *<em>event</em>, const char *<em>name</em>);
Functions resolver:
int <strong>tep_set_function_resolver</strong>(struct tep_handle *<em>tep</em>, tep_func_resolver_t *<em>func</em>, void *<em>priv</em>);
void <strong>tep_reset_function_resolver</strong>(struct tep_handle *<em>tep</em>);
const char *<strong>tep_find_function</strong>(struct tep_handle *<em>tep</em>, unsigned long long <em>addr</em>);
unsigned long long <strong>tep_find_function_address</strong>(struct tep_handle *<em>tep</em>, unsigned long long <em>addr</em>);
Filter management:
struct tep_event_filter *<strong>tep_filter_alloc</strong>(struct tep_handle *<em>tep</em>);
enum tep_errno <strong>tep_filter_add_filter_str</strong>(struct tep_event_filter *<em>filter</em>, const char *<em>filter_str</em>);
enum tep_errno <strong>tep_filter_match</strong>(struct tep_event_filter *<em>filter</em>, struct tep_record *<em>record</em>);
int <strong>tep_filter_strerror</strong>(struct tep_event_filter *<em>filter</em>, enum tep_errno <em>err</em>, char *buf, size_t <em>buflen</em>);
int <strong>tep_event_filtered</strong>(struct tep_event_filter *<em>filter</em>, int <em>event_id</em>);
void <strong>tep_filter_reset</strong>(struct tep_event_filter *<em>filter</em>);
void <strong>tep_filter_free</strong>(struct tep_event_filter *<em>filter</em>);
char *<strong>tep_filter_make_string</strong>(struct tep_event_filter *<em>filter</em>, int <em>event_id</em>);
int <strong>tep_filter_remove_event</strong>(struct tep_event_filter *<em>filter</em>, int <em>event_id</em>);
int <strong>tep_filter_copy</strong>(struct tep_event_filter *<em>dest</em>, struct tep_event_filter *<em>source</em>);
int <strong>tep_filter_compare</strong>(struct tep_event_filter *<em>filter1</em>, struct tep_event_filter *<em>filter2</em>);
Parsing various data from the records:
int <strong>tep_data_type</strong>(struct tep_handle *<em>tep</em>, struct tep_record *<em>rec</em>);
int <strong>tep_data_pid</strong>(struct tep_handle *<em>tep</em>, struct tep_record *<em>rec</em>);
int <strong>tep_data_preempt_count</strong>(struct tep_handle *<em>tep</em>, struct tep_record *<em>rec</em>);
int <strong>tep_data_flags</strong>(struct tep_handle *<em>tep</em>, struct tep_record *<em>rec</em>);
Command and task related APIs:
const char *<strong>tep_data_comm_from_pid</strong>(struct tep_handle *<em>tep</em>, int <em>pid</em>);
struct cmdline *<strong>tep_data_pid_from_comm</strong>(struct tep_handle *<em>tep</em>, const char *<em>comm</em>, struct cmdline *<em>next</em>);
int <strong>tep_register_comm</strong>(struct tep_handle *<em>tep</em>, const char *<em>comm</em>, int <em>pid</em>);
int <strong>tep_override_comm</strong>(struct tep_handle *<em>tep</em>, const char *<em>comm</em>, int <em>pid</em>);
bool <strong>tep_is_pid_registered</strong>(struct tep_handle *<em>tep</em>, int <em>pid</em>);
int <strong>tep_cmdline_pid</strong>(struct tep_handle *<em>tep</em>, struct cmdline *<em>cmdline</em>);
Endian related APIs:
int <strong>tep_is_bigendian</strong>(void);
unsigned long long <strong>tep_read_number</strong>(struct tep_handle *<em>tep</em>, const void *<em>ptr</em>, int <em>size</em>);
bool <strong>tep_is_file_bigendian</strong>(struct tep_handle *<em>tep</em>);
void <strong>tep_set_file_bigendian</strong>(struct tep_handle *<em>tep</em>, enum tep_endian <em>endian</em>);
bool <strong>tep_is_local_bigendian</strong>(struct tep_handle *<em>tep</em>);
void <strong>tep_set_local_bigendian</strong>(struct tep_handle *<em>tep</em>, enum tep_endian <em>endian</em>);
Control library logs:
int <strong>tep_set_loglevel</strong>(enum tep_loglevel <em>level</em>);
Trace sequences:
<strong>#include <trace-seq.h></strong>
void <strong>trace_seq_init</strong>(struct trace_seq *<em>s</em>);
void <strong>trace_seq_reset</strong>(struct trace_seq *<em>s</em>);
void <strong>trace_seq_destroy</strong>(struct trace_seq *<em>s</em>);
int <strong>trace_seq_printf</strong>(struct trace_seq *<em>s</em>, const char *<em>fmt</em>, …);
int <strong>trace_seq_vprintf</strong>(struct trace_seq *<em>s</em>, const char *<em>fmt</em>, va_list <em>args</em>);
int <strong>trace_seq_puts</strong>(struct trace_seq *<em>s</em>, const char *<em>str</em>);
int <strong>trace_seq_putc</strong>(struct trace_seq *<em>s</em>, unsigned char <em>c</em>);
void <strong>trace_seq_terminate</strong>(struct trace_seq *<em>s</em>);
int <strong>trace_seq_do_fprintf</strong>(struct trace_seq *<em>s</em>, FILE *<em>fp</em>);
int <strong>trace_seq_do_printf</strong>(struct trace_seq *<em>s</em>);</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>The libtraceevent(3) library provides APIs to access kernel tracepoint events,
located in the tracefs file system under the events directory.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_environment">ENVIRONMENT</h2>
<div class="sectionbody">
<div class="verseblock">
<pre class="content">TRACEEVENT_PLUGIN_DIR
Additional plugin directory. All shared object files, located in this directory will be loaded as traceevent plugins.</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_files">FILES</h2>
<div class="sectionbody">
<div class="verseblock">
<pre class="content"><strong>event-parse.h</strong>
Header file to include in order to have access to the library APIs.
<strong>trace-seq.h</strong>
Header file to include in order to have access to trace sequences related APIs.
Trace sequences are used to allow a function to call several other functions
to create a string of data to use.
<strong>-ltraceevent</strong>
Linker switch to add when building a program that uses the library.</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph"><p><strong>trace-cmd</strong>(1)</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_author">AUTHOR</h2>
<div class="sectionbody">
<div class="verseblock">
<pre class="content"><strong>Steven Rostedt</strong> <<a href="mailto:rostedt@goodmis.org">rostedt@goodmis.org</a>>, author of <strong>libtraceevent</strong>.
<strong>Tzvetomir Stoyanov</strong> <<a href="mailto:tz.stoyanov@gmail.com">tz.stoyanov@gmail.com</a>>, author of this man page.</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_reporting_bugs">REPORTING BUGS</h2>
<div class="sectionbody">
<div class="paragraph"><p>Report bugs to <<a href="mailto:linux-trace-devel@vger.kernel.org">linux-trace-devel@vger.kernel.org</a>></p></div>
</div>
</div>
<div class="sect1">
<h2 id="_license">LICENSE</h2>
<div class="sectionbody">
<div class="paragraph"><p>libtraceevent is Free Software licensed under the GNU LGPL 2.1</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_resources">RESOURCES</h2>
<div class="sectionbody">
<div class="paragraph"><p><a href="https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/">https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/</a></p></div>
</div>
</div>
</div>
<div id="footnotes"><hr /></div>
<div id="footer">
<div id="footer-text">
Last updated
2022-03-24 23:40:51 UTC
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