source: mainline/uspace/lib/c/generic/stats.c@ bbda5ab

/*
 * Copyright (c) 2010 Stanislav Kozina
 * Copyright (c) 2010 Martin Decky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup libc
 * @{
 */
/** @file
 */

#include <stats.h>
#include <sysinfo.h>
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <inttypes.h>

#define SYSINFO_STATS_MAX_PATH  64

/** Get CPUs statistics
 *
 * @param count Number of records returned.
 *
 * @return Array of stats_cpu_t structures.
 *         If non-NULL then it should be eventually freed
 *         by free().
 *
 */
stats_cpu_t *stats_get_cpus(size_t *count)
{
        size_t size = 0;
        stats_cpu_t *stats_cpus =
            (stats_cpu_t *) sysinfo_get_data("system.cpus", &size);
        
        assert((size % sizeof(stats_cpu_t)) == 0);
        
        *count = size / sizeof(stats_cpu_t);
        return stats_cpus;
}

/** Get physical memory statistics
 *
 *
 * @return Pointer to the stats_physmem_t structure.
 *         If non-NULL then it should be eventually freed
 *         by free().
 *
 */
stats_physmem_t *stats_get_physmem(void)
{
        size_t size = 0;
        stats_physmem_t *stats_physmem =
            (stats_physmem_t *) sysinfo_get_data("system.physmem", &size);
        
        assert((size == sizeof(stats_physmem_t)) || (size == 0));
        
        return stats_physmem;
}

/** Get task IDs
 *
 * @param count Number of IDs returned.
 *
 * @return Array of IDs (task_id_t).
 *         If non-NULL then it should be eventually freed
 *         by free().
 *
 */
task_id_t *stats_get_tasks(size_t *count)
{
        size_t size = 0;
        task_id_t *ids =
            (task_id_t *) sysinfo_get_data("system.tasks", &size);
        
        assert((size % sizeof(task_id_t)) == 0);
        
        *count = size / sizeof(task_id_t);
        return ids;
}

/** Get single task statistics
 *
 * @param task_id Task ID we are interested in.
 *
 * @return Pointer to the stats_task_t structure.
 *         If non-NULL then it should be eventually freed
 *         by free().
 *
 */
stats_task_t *stats_get_task(task_id_t task_id)
{
        char name[SYSINFO_STATS_MAX_PATH];
        snprintf(name, SYSINFO_STATS_MAX_PATH, "system.tasks.%" PRIu64, task_id);
        
        size_t size = 0;
        stats_task_t *stats_task =
            (stats_task_t *) sysinfo_get_data(name, &size);
        
        assert((size == sizeof(stats_task_t)) || (size == 0));
        
        return stats_task;
}

/** Get system load
 *
 * @param count Number of load records returned.
 *
 * @return Array of load records (load_t).
 *         If non-NULL then it should be eventually freed
 *         by free().
 *
 */
load_t *stats_get_load(size_t *count)
{
        size_t size = 0;
        load_t *load =
            (load_t *) sysinfo_get_data("system.load", &size);
        
        assert((size % sizeof(load_t)) == 0);
        
        *count = size / sizeof(load_t);
        return load;
}

/** Get system uptime
 *
 * @return System uptime (in seconds).
 *
 */
sysarg_t stats_get_uptime(void)
{
        sysarg_t uptime;
        if (sysinfo_get_value("system.uptime", &uptime) != EOK)
                uptime = 0;
        
        return uptime;
}

/** Print load fixed-point value
 *
 * Print the load record fixed-point value in decimal
 * representation on stdout.
 *
 * @param upper      Load record.
 * @param dec_length Number of decimal digits to print.
 *
 */
void stats_print_load_fragment(load_t upper, unsigned int dec_length)
{
        /* Magic value from BSD */
        load_t lower = 65536;
        
        /* Print the whole part */
        printf("%u.", upper / lower);
        
        load_t rest = (upper % lower) * 10;
        
        unsigned int i;
        for (i = 0; i < dec_length; i++) {
                printf("%u", rest / lower);
                rest = (rest % lower) * 10;
        }
}

/** @}
 */