usr.bin/systat/swap.c

   1 /*-
   2  * Copyright (c) 1980, 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)swap.c   8.3 (Berkeley) 4/29/95
  30  * $FreeBSD: src/usr.bin/systat/swap.c,v 1.12.2.2 2001/07/04 22:54:14 kris Exp $
  31  * $DragonFly: src/usr.bin/systat/swap.c,v 1.5 2008/11/10 04:59:45 swildner Exp $
  32  */
  33
  34 /*
  35  * swapinfo - based on a program of the same name by Kevin Lahey
  36  */
  37
  38 #include <sys/param.h>
  39 #include <sys/conf.h>
  40 #include <sys/ioctl.h>
  41 #include <sys/stat.h>
  42
  43 #include <kvm.h>
  44 #include <nlist.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <unistd.h>
  48 #include <string.h>
  49 #include <err.h>
  50
  51 #include "systat.h"
  52 #include "extern.h"
  53
  54 void showspace(char *header, int hlen, long blocksize);
  55
  56 kvm_t   *kd;
  57
  58 static long blocksize;
  59 static int hlen;
  60
  61 WINDOW *
  62 openswap(void)
  63 {
  64         return (subwin(stdscr, LINES-5-1, 0, 5, 0));
  65 }
  66
  67 void
  68 closeswap(WINDOW *w)
  69 {
  70         if (w == NULL)
  71                 return;
  72         wclear(w);
  73         wrefresh(w);
  74         delwin(w);
  75 }
  76
  77 /*
  78  * The meat of all the swap stuff is stolen from pstat(8)'s
  79  * swapmode(), which is based on a program called swapinfo written by
  80  * Kevin Lahey <kml@rokkaku.atl.ga.us>.
  81  */
  82
  83 int
  84 initswap(void)
  85 {
  86         char msgbuf[BUFSIZ];
  87         static int once = 0;
  88         struct kvm_swap dummy;
  89
  90         if (once)
  91                 return (1);
  92
  93         if (kvm_getswapinfo(kd, &dummy, 1, 0) < 0) {
  94                 snprintf(msgbuf, sizeof(msgbuf), "systat: kvm_getswapinfo failed");
  95                 error("%s", msgbuf);
  96                 return (0);
  97         }
  98
  99         once = 1;
 100         return (1);
 101 }
 102
 103 static struct kvm_swap  kvmsw[16];
 104 static int kvnsw;
 105
 106 void
 107 fetchswap(void)
 108 {
 109         kvnsw = kvm_getswapinfo(kd, kvmsw, 16, 0);
 110 }
 111
 112 void
 113 labelswap(void)
 114 {
 115         char *header;
 116         int row, i;
 117
 118         fetchswap();
 119
 120         row = 0;
 121         wmove(wnd, row, 0); wclrtobot(wnd);
 122         header = getbsize(&hlen, &blocksize);
 123         mvwprintw(wnd, row++, 0, "%-5s%*s%9s %55s",
 124             "Disk", hlen, header, "Used",
 125             "/0%  /10% /20% /30% /40% /50% /60% /70% /80% /90% /100");
 126
 127         for (i = 0; i < kvnsw; ++i) {
 128                 mvwprintw(wnd, i + 1, 0, "%-5s", kvmsw[i].ksw_devname);
 129         }
 130 }
 131
 132 void
 133 showswap(void)
 134 {
 135         int i;
 136         int pagesize = getpagesize();
 137
 138 #define CONVERT(v)      ((int)((quad_t)(v) * pagesize / blocksize))
 139
 140         for (i = 0; i <= kvnsw; ++i) {
 141                 int _col = 5;
 142                 int count;
 143
 144                 if (i == kvnsw) {
 145                         if (kvnsw == 1)
 146                                 break;
 147                         mvwprintw(
 148                             wnd,
 149                             i + 1,
 150                             _col,
 151                             "%-5s",
 152                             "Total"
 153                         );
 154                         _col += 5;
 155                 }
 156                 if (kvmsw[i].ksw_total == 0) {
 157                         mvwprintw(
 158                             wnd,
 159                             i + 1,
 160                             _col + 5,
 161                             "(swap not configured)"
 162                         );
 163                         continue;
 164                 }
 165
 166                 mvwprintw(
 167                     wnd,
 168                     i + 1,
 169                     _col,
 170                     "%*d",
 171                     hlen,
 172                     CONVERT(kvmsw[i].ksw_total)
 173                 );
 174                 _col += hlen;
 175
 176                 mvwprintw(
 177                     wnd,
 178                     i + 1,
 179                     _col,
 180                     "%9d  ",
 181                     CONVERT(kvmsw[i].ksw_used)
 182                 );
 183
 184                 count = (int)((double)kvmsw[i].ksw_used * 49.999 /
 185                     (double)kvmsw[i].ksw_total);
 186
 187                 while (count >= 0) {
 188                         waddch(wnd, 'X');
 189                         --count;
 190                 }
 191         }
 192 }