tep_find_common_field - Man Page

#include <event-parse​.h>

struct tep_format_field *tep_find_common_field(struct tep_event *event, const char *name);
struct tep_format_field *tep_find_field(struct tep_event_ormat *event, const char *name);
struct tep_format_field *tep_find_any_field(struct tep_event *event, const char *name);

These functions search for a field with given name in an event​. The field returned can be used to find the field content from within a data record​.

The tep_find_common_field() function searches for a common field with name in the event​.

The tep_find_field() function searches for an event specific field with name in the event​.

The tep_find_any_field() function searches for any field with name in the event​.

The tep_find_common_field(), tep_find_field() and _tep_find_any_field() functions return a pointer to the found field, or NULL in case there is no field with the requested name​.

#include <event-parse​.h>
​.​.​.
void get_htimer_info(struct tep_handle *tep, struct tep_record *record)
{
        struct tep_format_field *field;
        struct tep_event *event;
        long long softexpires;
        int mode;
        int pid;

        event = tep_find_event_by_name(tep, "timer", "hrtimer_start");

        field = tep_find_common_field(event, "common_pid");
        if (field == NULL) {
                /* Cannot find "common_pid" field in the event */
        } else {
                /* Get pid from the data record */
                pid = tep_read_number(tep, record->data + field->offset,
                                      field->size);
        }

        field = tep_find_field(event, "softexpires");
        if (field == NULL) {
                /* Cannot find "softexpires" event specific field in the event */
        } else {
                /* Get softexpires parameter from the data record */
                softexpires = tep_read_number(tep, record->data + field->offset,
                                              field->size);
        }

        field = tep_find_any_field(event, "mode");
        if (field == NULL) {
                /* Cannot find "mode" field in the event */
        } else
        {
                /* Get mode parameter from the data record */
                mode = tep_read_number(tep, record->data + field->offset,
                                       field->size);
        }
}
​.​.​.

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​.

libtraceevent(3), trace-cmd(1)

Steven Rostedt <rostedt@goodmis​.org​[1]>, author of libtraceevent​.
Tzvetomir Stoyanov <tz​.stoyanov@gmail​.com​[2]>, author of this man page​.

Report bugs to <linux-trace-devel@vger​.kernel​.org​^[3]>

libtraceevent is Free Software licensed under the GNU LGPL 2​.1

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

1. rostedt@goodmis.org
   mailto:rostedt@goodmis.org
2. tz.stoyanov@gmail.com
   mailto:tz.stoyanov@gmail.com
3. linux-trace-devel@vger.kernel.org
   mailto:linux-trace-devel@vger.kernel.org