/*
 * This file is part of Xfce (https://gitlab.xfce.org).
 *
 * Copyright (c) 2003-2004 Roger Seguin <roger_seguin@msn.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 Library General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifndef _devperf_h
#define _devperf_h

#include <glib.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>

enum {
    NO_ERROR,
    NO_EXTENDED_STATS
};

typedef struct devperf_t {
    uint64_t        timestamp_ns;
    uint64_t        rbytes;     /* Number of bytes read from the device */
    uint64_t        wbytes;     /* Number of bytes written to the device */
    uint64_t        rbusy_ns;   /* Device read busy time */
    uint64_t        wbusy_ns;   /* Device write busy time */
    int32_t         qlen;       /* Current queue length */
} devperf_t;

G_BEGIN_DECLS

/* Make required initialisations */
/* Return 0 on success */
int DevPerfInit (void);

/* Check the availability of required kernel statistics */
/* Get the statistics file name */
/* Return 0 on success */
int DevCheckStatAvailability (char const **StatisticsFile);

/* Get disk performance data stored by the kernel */
/* Return 0 on success, -1 otherwise */
int DevGetPerfData (const void *devid, struct devperf_t *perf);

G_END_DECLS

#endif /* _devperf_h */
