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swap.c revision 1.15 
      1 /*	$NetBSD: swap.c,v 1.15 2003/02/24 10:10:00 dsl Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1997 Matthew R. Green.  All rights reserved.
      5  * Copyright (c) 1980, 1992, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  */
     36 
     37 #include <sys/cdefs.h>
     38 #ifndef lint
     39 #if 0
     40 static char sccsid[] = "@(#)swap.c	8.3 (Berkeley) 4/29/95";
     41 #endif
     42 __RCSID("$NetBSD: swap.c,v 1.15 2003/02/24 10:10:00 dsl Exp $");
     43 #endif /* not lint */
     44 
     45 #include <sys/param.h>
     46 #include <sys/swap.h>
     47 
     48 #include <errno.h>
     49 #include <stdio.h>
     50 #include <stdlib.h>
     51 #include <string.h>
     52 #include <unistd.h>
     53 
     54 #include "systat.h"
     55 #include "extern.h"
     56 
     57 void showspace(char *header, int hlen, long blocksize);
     58 
     59 static	long blocksize;
     60 static	int hlen, nswap, rnswap;
     61 static	int first = 1;
     62 static	struct swapent *swap_devices;
     63 
     64 WINDOW *
     65 openswap(void)
     66 {
     67 
     68 	return (subwin(stdscr, -1, 0, 5, 0));
     69 }
     70 
     71 void
     72 closeswap(WINDOW *w)
     73 {
     74 
     75 	if (w == NULL)
     76 		return;
     77 	wclear(w);
     78 	wrefresh(w);
     79 	delwin(w);
     80 }
     81 
     82 /* do nothing */
     83 int
     84 initswap(void)
     85 {
     86 
     87 	return (1);
     88 }
     89 
     90 void
     91 fetchswap(void)
     92 {
     93 	int	update_label = 0;
     94 
     95 	first = 0;
     96 	nswap = swapctl(SWAP_NSWAP, 0, 0);
     97 	if (nswap < 0)
     98 		error("error: %s", strerror(errno));
     99 	if (nswap == 0)
    100 		return;
    101 	update_label = (nswap != rnswap);
    102 
    103 	if (swap_devices)
    104 		(void)free(swap_devices);
    105 	if ((swap_devices = malloc(nswap * sizeof(*swap_devices))) == NULL) {
    106 		error("malloc failed");
    107 		die(0);
    108 	}
    109 
    110 	if ((rnswap = swapctl(SWAP_STATS, (void *)swap_devices, nswap)) != nswap) {
    111 		error("swapctl failed");
    112 		die(0);
    113 	}
    114 
    115 	if (update_label)
    116 		labelswap();
    117 }
    118 
    119 void
    120 labelswap(void)
    121 {
    122 	char	*header;
    123 	int	row;
    124 
    125 	row = 0;
    126 	wmove(wnd, row, 0);
    127 	wclrtobot(wnd);
    128 	if (first)
    129 		fetchswap();
    130 	if (nswap == 0) {
    131 		mvwprintw(wnd, row++, 0, "No swap");
    132 		return;
    133 	}
    134 	header = getbsize(&hlen, &blocksize);
    135 	mvwprintw(wnd, row++, 0, "%-5s%*s%9s  %55s",
    136 	    "Disk", hlen, header, "Used",
    137 	    "/0%  /10% /20% /30% /40% /50% /60% /70% /80% /90% /100%");
    138 }
    139 
    140 void
    141 showswap(void)
    142 {
    143 	int	col, div, i, avail, used, xsize, free;
    144 	struct	swapent *sep;
    145 	char	*p;
    146 
    147 	div = blocksize / 512;
    148 	free = avail = 0;
    149 	for (sep = swap_devices, i = 0; i < nswap; i++, sep++) {
    150 		if (sep == NULL)
    151 			continue;
    152 
    153 		p = strrchr(sep->se_path, '/');
    154 		p = p ? p+1 : sep->se_path;
    155 
    156 		mvwprintw(wnd, i + 1, 0, "%-5s", p);
    157 
    158 		col = 5;
    159 		mvwprintw(wnd, i + 1, col, "%*d", hlen, sep->se_nblks / div);
    160 
    161 		col += hlen;
    162 		xsize = sep->se_nblks;
    163 		used = sep->se_inuse;
    164 		avail += xsize;
    165 		free += xsize - used;
    166 		mvwprintw(wnd, i + 1, col, "%9d  ", used / div);
    167 		wclrtoeol(wnd);
    168 		whline(wnd, 'X', (100 * used / xsize + 1) / 2);
    169 	}
    170 	/* do total if necessary */
    171 	if (nswap > 1) {
    172 		used = avail - free;
    173 		mvwprintw(wnd, i + 1, 0, "%-5s%*d%9d  ",
    174 		    "Total", hlen, avail / div, used / div);
    175 		wclrtoeol(wnd);
    176 		whline(wnd, 'X', (100 * used / avail + 1) / 2);
    177 	}
    178 }
    179