tep_parse_event3

Usage

#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);

Overview

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.

Examples

#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.

Resources

https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/

Notes

1.

[email protected]

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2.

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mailto:[email protected]

3.

[email protected]

mailto:[email protected]