cmd/dumpadm/swap.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 (c) 1998 by Sun Microsystems, Inc.
 * All rights reserved.
 */

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

#include <sys/param.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>

#include "utils.h"
#include "swap.h"

swaptbl_t *
swap_list(void)
{
    swaptbl_t *swt;

    int n, i;
    char *p;

    if ((n = swapctl(SC_GETNSWP, NULL)) == -1) {
        warn(gettext("failed to get swap table size"));
        return (NULL);
    }

    swt = malloc(sizeof (int) + n * sizeof (swapent_t) + n * MAXPATHLEN);

    if (swt == NULL) {
        warn(gettext("failed to allocate swap table"));
        return (NULL);
    }

    swt->swt_n = n;
    p = (char *)swt + (sizeof (int) + n * sizeof (swapent_t));

    for (i = 0; i < n; i++) {
        swt->swt_ent[i].ste_path = p;
        p += MAXPATHLEN;
    }

    if ((n = swapctl(SC_LIST, swt)) == -1) {
        warn(gettext("failed to get swap table"));
        free(swt);
        return (NULL);
    }

    swt->swt_n = n; /* Number of entries filled in */
    n = 0;      /* Number of valid entries */

    /*
     * Shrink the array of swapent_t structures by stripping out
     * all those which are ST_INDEL or ST_DOINGDEL.
     */
    for (i = 0; i < swt->swt_n; i++) {
        if (!(swt->swt_ent[i].ste_flags & (ST_INDEL | ST_DOINGDEL))) {
            /*
             * If i is ahead of the valid count (n), copy the
             * ith entry back to the nth entry so valid entries
             * fill the initial part of swt_ent[].
             */
            if (i > n) {
                (void) memcpy(&swt->swt_ent[n],
                    &swt->swt_ent[i], sizeof (swapent_t));
            }

            /*
             * If the pathname isn't absolute, assume it begins
             * with /dev as swap(1m) does.
             */
            if (swt->swt_ent[n].ste_path[0] != '/') {
                char buf[MAXPATHLEN];

                (void) snprintf(buf, sizeof (buf), "/dev/%s",
                    swt->swt_ent[n].ste_path);
                (void) strcpy(swt->swt_ent[n].ste_path, buf);
            }

            n++;
        }
    }

    swt->swt_n = n; /* Update swt_n with number of valid entries */
    return (swt);
}