NAME¶

tep_parse_event, tep_parse_format - Parse the event format information

SYNOPSIS¶

#include <event-parse.h>
enum tep_errno tep_parse_event(struct tep_handle *tep, const char *buf, unsigned long size, const char *sys);
enum tep_errno tep_parse_format(struct tep_handle *tep, struct tep_event **eventp, const char *buf, unsigned long size, const char *sys);

DESCRIPTION¶

The tep_parse_event() function parses the event format and creates an event structure to quickly parse raw data for a given event. The tep argument is the trace event parser context. The created event structure is stored in the tep context. The buf argument is a buffer with size, where the event format data is. The event format data can be taken from tracefs/events/.../.../format files. The sys argument is the system of the event.

The tep_parse_format() function does the same as tep_parse_event(). The only difference is in the extra eventp argument, where the newly created event structure is returned.

RETURN VALUE¶

Both tep_parse_event() and tep_parse_format() functions return 0 on success, or TEP_ERRNO__... in case of an error.

EXAMPLE¶

#include <event-parse.h>
...
struct tep_handle *tep = tep_alloc();
...
char *buf;
int size;
struct tep_event *event = NULL;
buf = read_file("/sys/kernel/tracing/events/ftrace/print/format", &size);
if (tep_parse_event(tep, buf, size, "ftrace") != 0) {


        /* Failed to parse the ftrace print format */
}
if (tep_parse_format(tep, &event, buf, size, "ftrace") != 0) {


        /* Failed to parse the ftrace print format */
}
...

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¶

libtraceevent(3), trace-cmd(1)

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

2.

tz.stoyanov@gmail.com

3.

linux-trace-devel@vger.kernel.org