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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <sys/cdefs.h>
  35
  36 __FBSDID("$FreeBSD$");
  37
  38 #ifdef lint
  39 static const char sccsid[] = "@(#)swap.c        8.3 (Berkeley) 4/29/95";
  40 #endif
  41
  42 /*
  43  * swapinfo - based on a program of the same name by Kevin Lahey
  44  */
  45
  46 #include <sys/param.h>
  47 #include <sys/ioctl.h>
  48 #include <sys/stat.h>
  49
  50 #include <kvm.h>
  51 #include <nlist.h>
  52 #include <stdio.h>
  53 #include <stdlib.h>
  54 #include <unistd.h>
  55 #include <string.h>
  56 #include <err.h>
  57
  58 #include "systat.h"
  59 #include "extern.h"
  60
  61 kvm_t   *kd;
  62
  63 static char *header;
  64 static long blocksize;
  65 static int dlen, odlen;
  66 static int hlen;
  67 static int ulen, oulen;
  68 static int pagesize;
  69
  70 WINDOW *
  71 openswap(void)
  72 {
  73         return (subwin(stdscr, LINES-3-1, 0, MAINWIN_ROW, 0));
  74 }
  75
  76 void
  77 closeswap(WINDOW *w)
  78 {
  79         if (w == NULL)
  80                 return;
  81         wclear(w);
  82         wrefresh(w);
  83         delwin(w);
  84 }
  85
  86 /*
  87  * The meat of all the swap stuff is stolen from pstat(8)'s
  88  * swapmode(), which is based on a program called swapinfo written by
  89  * Kevin Lahey <kml@rokkaku.atl.ga.us>.
  90  */
  91
  92 #define NSWAP   16
  93
  94 static struct kvm_swap kvmsw[NSWAP];
  95 static int kvnsw, okvnsw;
  96
  97 static void calclens(void);
  98
  99 #define CONVERT(v)      ((int)((int64_t)(v) * pagesize / blocksize))
 100
 101 static void
 102 calclens(void)
 103 {
 104         int i, n;
 105         int len;
 106
 107         dlen = sizeof("Disk");
 108         for (i = 0; i < kvnsw; ++i) {
 109                 len = strlen(kvmsw[i].ksw_devname);
 110                 if (dlen < len)
 111                         dlen = len;
 112         }
 113
 114         ulen = sizeof("Used");
 115         for (n = CONVERT(kvmsw[kvnsw].ksw_used), len = 2; n /= 10; ++len);
 116         if (ulen < len)
 117                 ulen = len;
 118 }
 119
 120 int
 121 initswap(void)
 122 {
 123         static int once = 0;
 124
 125         if (once)
 126                 return (1);
 127
 128         header = getbsize(&hlen, &blocksize);
 129         pagesize = getpagesize();
 130
 131         if ((kvnsw = kvm_getswapinfo(kd, kvmsw, NSWAP, 0)) < 0) {
 132                 error("systat: kvm_getswapinfo failed");
 133                 return (0);
 134         }
 135         okvnsw = kvnsw;
 136
 137         calclens();
 138         odlen = dlen;
 139         oulen = ulen;
 140
 141         once = 1;
 142         return (1);
 143 }
 144
 145 void
 146 fetchswap(void)
 147 {
 148
 149         okvnsw = kvnsw;
 150         if ((kvnsw = kvm_getswapinfo(kd, kvmsw, NSWAP, 0)) < 0) {
 151                 error("systat: kvm_getswapinfo failed");
 152                 return;
 153         }
 154
 155         odlen = dlen;
 156         oulen = ulen;
 157         calclens();
 158 }
 159
 160 void
 161 labelswap(void)
 162 {
 163         const char *name;
 164         int i;
 165
 166         fetchswap();
 167
 168         werase(wnd);
 169
 170         mvwprintw(wnd, 0, 0, "%*s%*s%*s %s",
 171             -dlen, "Disk", hlen, header, ulen, "Used",
 172             "/0%  /10  /20  /30  /40  /50  /60  /70  /80  /90  /100");
 173
 174         for (i = 0; i <= kvnsw; ++i) {
 175                 if (i == kvnsw) {
 176                         if (kvnsw == 1)
 177                                 break;
 178                         name = "Total";
 179                 } else
 180                         name = kvmsw[i].ksw_devname;
 181                 mvwprintw(wnd, i + 1, 0, "%*s", -dlen, name);
 182         }
 183 }
 184
 185 void
 186 showswap(void)
 187 {
 188         int count;
 189         int i;
 190
 191         if (kvnsw != okvnsw || dlen != odlen || ulen != oulen)
 192                 labelswap();
 193
 194         for (i = 0; i <= kvnsw; ++i) {
 195                 if (i == kvnsw) {
 196                         if (kvnsw == 1)
 197                                 break;
 198                 }
 199
 200                 if (kvmsw[i].ksw_total == 0) {
 201                         mvwprintw(
 202                             wnd,
 203                             i + 1,
 204                             dlen + hlen + ulen + 1,
 205                             "(swap not configured)"
 206                         );
 207                         continue;
 208                 }
 209
 210                 wmove(wnd, i + 1, dlen);
 211
 212                 wprintw(wnd, "%*d", hlen, CONVERT(kvmsw[i].ksw_total));
 213                 wprintw(wnd, "%*d", ulen, CONVERT(kvmsw[i].ksw_used));
 214
 215                 count = 50.0 * kvmsw[i].ksw_used / kvmsw[i].ksw_total + 1;
 216
 217                 waddch(wnd, ' ');
 218                 while (count--)
 219                         waddch(wnd, 'X');
 220                 wclrtoeol(wnd);
 221         }
 222 }