usr/src/cmd/dumpadm/swap.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 1998 by Sun Microsystems, Inc.
  24  * All rights reserved.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <sys/param.h>
  30 #include <string.h>
  31 #include <stdlib.h>
  32 #include <stdio.h>
  33
  34 #include "utils.h"
  35 #include "swap.h"
  36
  37 swaptbl_t *
  38 swap_list(void)
  39 {
  40         swaptbl_t *swt;
  41
  42         int n, i;
  43         char *p;
  44
  45         if ((n = swapctl(SC_GETNSWP, NULL)) == -1) {
  46                 warn(gettext("failed to get swap table size"));
  47                 return (NULL);
  48         }
  49
  50         swt = malloc(sizeof (int) + n * sizeof (swapent_t) + n * MAXPATHLEN);
  51
  52         if (swt == NULL) {
  53                 warn(gettext("failed to allocate swap table"));
  54                 return (NULL);
  55         }
  56
  57         swt->swt_n = n;
  58         p = (char *)swt + (sizeof (int) + n * sizeof (swapent_t));
  59
  60         for (i = 0; i < n; i++) {
  61                 swt->swt_ent[i].ste_path = p;
  62                 p += MAXPATHLEN;
  63         }
  64
  65         if ((n = swapctl(SC_LIST, swt)) == -1) {
  66                 warn(gettext("failed to get swap table"));
  67                 free(swt);
  68                 return (NULL);
  69         }
  70
  71         swt->swt_n = n; /* Number of entries filled in */
  72         n = 0;          /* Number of valid entries */
  73
  74         /*
  75          * Shrink the array of swapent_t structures by stripping out
  76          * all those which are ST_INDEL or ST_DOINGDEL.
  77          */
  78         for (i = 0; i < swt->swt_n; i++) {
  79                 if (!(swt->swt_ent[i].ste_flags & (ST_INDEL | ST_DOINGDEL))) {
  80                         /*
  81                          * If i is ahead of the valid count (n), copy the
  82                          * ith entry back to the nth entry so valid entries
  83                          * fill the initial part of swt_ent[].
  84                          */
  85                         if (i > n) {
  86                                 (void) memcpy(&swt->swt_ent[n],
  87                                     &swt->swt_ent[i], sizeof (swapent_t));
  88                         }
  89
  90                         /*
  91                          * If the pathname isn't absolute, assume it begins
  92                          * with /dev as swap(1m) does.
  93                          */
  94                         if (swt->swt_ent[n].ste_path[0] != '/') {
  95                                 char buf[MAXPATHLEN];
  96
  97                                 (void) snprintf(buf, sizeof (buf), "/dev/%s",
  98                                     swt->swt_ent[n].ste_path);
  99                                 (void) strcpy(swt->swt_ent[n].ste_path, buf);
 100                         }
 101
 102                         n++;
 103                 }
 104         }
 105
 106         swt->swt_n = n; /* Update swt_n with number of valid entries */
 107         return (swt);
 108 }