common/eversholt/alloc.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 *
 * alloc.c -- memory allocation wrapper functions, for eft.so FMD module
 *
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <fm/fmd_api.h>

#include "alloc.h"
#include "out.h"
#include "stats.h"

extern fmd_hdl_t *Hdl;      /* handle from eft.c */

/* room to store size, possibly more to maintain alignment for long longs */
#define HDRSIZ  sizeof (long long)

static struct stats *Malloctotal;
static struct stats *Freetotal;
static struct stats *Malloccount;
static struct stats *Freecount;

static int totalcount;

void
alloc_init(void)
{
    Malloctotal = stats_new_counter("alloc.total", "bytes allocated", 1);
    Freetotal = stats_new_counter("free.total", "bytes freed", 1);
    Malloccount = stats_new_counter("alloc.calls", "alloc calls", 1);
    Freecount = stats_new_counter("free.calls", "free calls", 1);
}

void
alloc_fini(void)
{
    struct stats *mt, *ft, *mc, *fc;

    mt = Malloctotal;
    ft = Freetotal;
    mc = Malloccount;
    fc = Freecount;

    Malloctotal = NULL;
    Freetotal = NULL;
    Malloccount = NULL;
    Freecount = NULL;

    stats_delete(mt);
    stats_delete(ft);
    stats_delete(mc);
    stats_delete(fc);
}

/*
 * alloc_malloc -- a malloc() with checks
 *
 * this routine is typically called via the MALLOC() macro in alloc.h
 */
/*ARGSUSED*/
void *
alloc_malloc(size_t nbytes, const char *fname, int line)
{
    char *retval;

    ASSERT(nbytes > 0);

    retval = fmd_hdl_alloc(Hdl, nbytes + HDRSIZ, FMD_SLEEP);

    /* retval can't be NULL since fmd_hdl_alloc() sleeps for memory */

    bcopy((void *)&nbytes, (void *)retval, sizeof (nbytes));
    retval += HDRSIZ;

    if (Malloctotal)
        stats_counter_add(Malloctotal, nbytes);

    if (Malloccount)
        stats_counter_bump(Malloccount);

    totalcount += nbytes + HDRSIZ;
    return ((void *)retval);
}

/*
 * alloc_realloc -- a realloc() with checks
 *
 * this routine is typically called via the REALLOC() macro in alloc.h
 */
void *
alloc_realloc(void *ptr, size_t nbytes, const char *fname, int line)
{
    void *retval = alloc_malloc(nbytes, fname, line);

    if (ptr != NULL) {
        size_t osize;

        bcopy((void *)((char *)ptr - HDRSIZ), (void *)&osize,
            sizeof (osize));
        /* now we have the new memory, copy in the old contents */
        bcopy(ptr, retval, (osize < nbytes) ? osize : nbytes);

        /* don't need the old memory anymore */
        alloc_free((char *)ptr, fname, line);
    }

    return (retval);
}

/*
 * alloc_strdup -- a strdup() with checks
 *
 * this routine is typically called via the STRDUP() macro in alloc.h
 */
char *
alloc_strdup(const char *ptr, const char *fname, int line)
{
    char *retval = alloc_malloc(strlen(ptr) + 1, fname, line);

    (void) strcpy(retval, ptr);

    return (retval);
}

/*
 * alloc_free -- a free() with checks
 *
 * this routine is typically called via the FREE() macro in alloc.h
 */
/*ARGSUSED*/
void
alloc_free(void *ptr, const char *fname, int line)
{
    size_t osize;

    ASSERT(ptr != NULL);

    bcopy((void *)((char *)ptr - HDRSIZ), (void *)&osize, sizeof (osize));

    /* nothing to check in this version */

    fmd_hdl_free(Hdl, (char *)ptr - HDRSIZ, osize + HDRSIZ);

    if (Freetotal)
        stats_counter_add(Freetotal, osize);

    if (Freecount)
        stats_counter_bump(Freecount);
    totalcount -= osize + HDRSIZ;
}

int
alloc_total()
{
    return (totalcount);
}

/*
 * variants that don't maintain size in header - saves space
 */
void *
alloc_xmalloc(size_t nbytes)
{
    char *retval;

    ASSERT(nbytes > 0);
    retval = fmd_hdl_alloc(Hdl, nbytes, FMD_SLEEP);
    if (Malloctotal)
        stats_counter_add(Malloctotal, nbytes);
    if (Malloccount)
        stats_counter_bump(Malloccount);
    totalcount += nbytes;
    return ((void *)retval);
}

void
alloc_xfree(void *ptr, size_t size)
{
    ASSERT(ptr != NULL);

    fmd_hdl_free(Hdl, (char *)ptr, size);
    if (Freetotal)
        stats_counter_add(Freetotal, size);
    if (Freecount)
        stats_counter_bump(Freecount);
    totalcount -= size;
}