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[lttv.git] / ltt / branches / poly / ltt / event.h

/* This file is part of the Linux Trace Toolkit trace reading library
 * Copyright (C) 2003-2004 Michel Dagenais
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License Version 2.1 as published by the Free Software Foundation.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#ifndef EVENT_H
#define EVENT_H

#include <glib.h>
#include <ltt/ltt.h>
#include <sys/types.h>

LttEvent *ltt_event_new();

void ltt_event_destroy(LttEvent *event);

/* Events and their content, including the raw data, are only valid 
   until reading another event from the same tracefile. 
   Indeed, since event reading is critical to the performance, 
   the memory associated with an event may be reused at each read. */

/* Obtain the trace unique integer id associated with the type of 
   this event */

unsigned ltt_event_eventtype_id(const LttEvent *e);

unsigned ltt_event_facility_id(const LttEvent *e);

/* Facility and type for the event */

LttFacility *ltt_event_facility(const LttEvent *e);

LttEventType *ltt_event_eventtype(const LttEvent *e);



/* Time and cycle count for the event */

LttTime ltt_event_time(const LttEvent *e);

LttCycleCount ltt_event_cycle_count(const LttEvent *e);


/* Obtain the position of the event within the tracefile. This
   is used to seek back to this position later or to seek to another
   position, computed relative to this position. The event position
   structure is opaque and contains several fields, only two
   of which are user accessible: block number and event index
   within the block. */

void ltt_event_position(LttEvent *e, LttEventPosition *ep);

LttEventPosition * ltt_event_position_new();

void ltt_event_position_get(LttEventPosition *ep, LttTracefile **tf,
        guint *block, guint *offset, guint64 *tsc);

gint ltt_event_position_compare(const LttEventPosition *ep1,
                                const LttEventPosition *ep2);

void ltt_event_position_copy(LttEventPosition *dest,
                             const LttEventPosition *src);

LttTracefile *ltt_event_position_tracefile(LttEventPosition *ep);

/* CPU id of the event */

unsigned ltt_event_cpu_id(LttEvent *e);


/* Pointer to the raw data for the event. This should not be used directly
   unless prepared to do all the architecture specific conversions. */

void *ltt_event_data(LttEvent *e);


/* The number of elements in a sequence field is specific to each event 
   instance. This function returns the number of elements for an array or 
   sequence field in an event. */

guint64 ltt_event_field_element_number(LttEvent *e, LttField *f);


/* Set the currently selected element for a sequence or array field. */

LttField *ltt_event_field_element_select(LttEvent *e, LttField *f, gulong i);

off_t ltt_event_field_offset(LttEvent *e, LttField *f);

/* A union is like a structure except that only a single member at a time
   is present depending on the specific event instance. This function tells
   the active member for a union field in an event. */

unsigned ltt_event_field_union_member(LttEvent *e, LttField *f);


/* These functions extract data from an event after architecture specific
   conversions. */

guint32 ltt_event_get_unsigned(LttEvent *e, LttField *f);

gint32 ltt_event_get_int(LttEvent *e, LttField *f);

guint64 ltt_event_get_long_unsigned(LttEvent *e, LttField *f);

gint64 ltt_event_get_long_int(LttEvent *e, LttField *f);

float ltt_event_get_float(LttEvent *e, LttField *f);

double ltt_event_get_double(LttEvent *e, LttField *f);


/* The string obtained is only valid until the next read from
   the same tracefile. */

gchar *ltt_event_get_string(LttEvent *e, LttField *f);

void compute_offsets(LttTracefile *tf, LttFacility *fac,
    LttEventType *event, off_t *offset, void *root);

#endif // EVENT_H