747e942c39
Create man pages for libtraceevent APIs: tep_get_event(), tep_get_first_event(), tep_get_events_count() Signed-off-by: Tzvetomir Stoyanov <tstoyanov@vmware.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: linux-trace-devel@vger.kernel.org Link: http://lore.kernel.org/linux-trace-devel/20190503091119.23399-17-tstoyanov@vmware.com Link: http://lkml.kernel.org/r/20190510200108.561088129@goodmis.org Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
100 lines
2.5 KiB
Plaintext
100 lines
2.5 KiB
Plaintext
libtraceevent(3)
|
|
================
|
|
|
|
NAME
|
|
----
|
|
tep_get_event, tep_get_first_event, tep_get_events_count - Access events.
|
|
|
|
SYNOPSIS
|
|
--------
|
|
[verse]
|
|
--
|
|
*#include <event-parse.h>*
|
|
|
|
struct tep_event pass:[*]*tep_get_event*(struct tep_handle pass:[*]_tep_, int _index_);
|
|
struct tep_event pass:[*]*tep_get_first_event*(struct tep_handle pass:[*]_tep_);
|
|
int *tep_get_events_count*(struct tep_handle pass:[*]_tep_);
|
|
--
|
|
|
|
DESCRIPTION
|
|
-----------
|
|
The _tep_get_event()_ function returns a pointer to event at the given _index_.
|
|
The _tep_ argument is trace event parser context, the _index_ is the index of
|
|
the requested event.
|
|
|
|
The _tep_get_first_event()_ function returns a pointer to the first event.
|
|
As events are stored in an array, this function returns the pointer to the
|
|
beginning of the array. The _tep_ argument is trace event parser context.
|
|
|
|
The _tep_get_events_count()_ function returns the number of the events
|
|
in the array. The _tep_ argument is trace event parser context.
|
|
|
|
RETURN VALUE
|
|
------------
|
|
The _tep_get_event()_ returns a pointer to the event located at _index_.
|
|
NULL is returned in case of error, in case there are no events or _index_ is
|
|
out of range.
|
|
|
|
The _tep_get_first_event()_ returns a pointer to the first event. NULL is
|
|
returned in case of error, or in case there are no events.
|
|
|
|
The _tep_get_events_count()_ returns the number of the events. 0 is
|
|
returned in case of error, or in case there are no events.
|
|
|
|
EXAMPLE
|
|
-------
|
|
[source,c]
|
|
--
|
|
#include <event-parse.h>
|
|
...
|
|
struct tep_handle *tep = tep_alloc();
|
|
...
|
|
int i,count = tep_get_events_count(tep);
|
|
struct tep_event *event, *events = tep_get_first_event(tep);
|
|
|
|
if (events == NULL) {
|
|
/* There are no events */
|
|
} else {
|
|
for (i = 0; i < count; i++) {
|
|
event = (events+i);
|
|
/* process events[i] */
|
|
}
|
|
|
|
/* Get the last event */
|
|
event = tep_get_event(tep, count-1);
|
|
}
|
|
--
|
|
|
|
FILES
|
|
-----
|
|
[verse]
|
|
--
|
|
*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
|
|
------
|
|
[verse]
|
|
--
|
|
*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
|
|
*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
|
|
--
|
|
REPORTING BUGS
|
|
--------------
|
|
Report bugs to <linux-trace-devel@vger.kernel.org>
|
|
|
|
LICENSE
|
|
-------
|
|
libtraceevent is Free Software licensed under the GNU LGPL 2.1
|
|
|
|
RESOURCES
|
|
---------
|
|
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
|