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swap.c revision 1.18 
      1 /*	$NetBSD: swap.c,v 1.18 2005/02/26 22:12:34 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. Neither the name of the University nor the names of its contributors
     17  *    may be used to endorse or promote products derived from this software
     18  *    without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     30  * SUCH DAMAGE.
     31  */
     32 
     33 #include <sys/cdefs.h>
     34 #ifndef lint
     35 #if 0
     36 static char sccsid[] = "@(#)swap.c	8.3 (Berkeley) 4/29/95";
     37 #endif
     38 __RCSID("$NetBSD: swap.c,v 1.18 2005/02/26 22:12:34 dsl Exp $");
     39 #endif /* not lint */
     40 
     41 #include <sys/param.h>
     42 #include <sys/swap.h>
     43 
     44 #include <errno.h>
     45 #include <stdio.h>
     46 #include <stdlib.h>
     47 #include <string.h>
     48 #include <unistd.h>
     49 
     50 #include "systat.h"
     51 #include "extern.h"
     52 
     53 void showspace(char *header, int hlen, long blocksize);
     54 
     55 static	long blocksize;
     56 static	int hlen, nswap, rnswap;
     57 static	int first = 1;
     58 static	struct swapent *swap_devices;
     59 
     60 WINDOW *
     61 openswap(void)
     62 {
     63 
     64 	return (subwin(stdscr, -1, 0, 5, 0));
     65 }
     66 
     67 void
     68 closeswap(WINDOW *w)
     69 {
     70 
     71 	if (w == NULL)
     72 		return;
     73 	wclear(w);
     74 	wrefresh(w);
     75 	delwin(w);
     76 }
     77 
     78 /* do nothing */
     79 int
     80 initswap(void)
     81 {
     82 
     83 	return (1);
     84 }
     85 
     86 void
     87 fetchswap(void)
     88 {
     89 	int	update_label = 0;
     90 
     91 	first = 0;
     92 	nswap = swapctl(SWAP_NSWAP, 0, 0);
     93 	if (nswap < 0)
     94 		error("error: %s", strerror(errno));
     95 	if (nswap == 0)
     96 		return;
     97 	update_label = (nswap != rnswap);
     98 
     99 	if (swap_devices)
    100 		(void)free(swap_devices);
    101 	if ((swap_devices = malloc(nswap * sizeof(*swap_devices))) == NULL) {
    102 		error("malloc failed");
    103 		die(0);
    104 	}
    105 
    106 	if ((rnswap = swapctl(SWAP_STATS, (void *)swap_devices, nswap)) != nswap) {
    107 		error("swapctl failed");
    108 		die(0);
    109 	}
    110 
    111 	if (update_label)
    112 		labelswap();
    113 }
    114 
    115 void
    116 labelswap(void)
    117 {
    118 	char	*header;
    119 	int	row;
    120 
    121 	row = 0;
    122 	wmove(wnd, row, 0);
    123 	wclrtobot(wnd);
    124 	if (first)
    125 		fetchswap();
    126 	if (nswap == 0) {
    127 		mvwprintw(wnd, row++, 0, "No swap");
    128 		return;
    129 	}
    130 	header = getbsize(&hlen, &blocksize);
    131 	mvwprintw(wnd, row++, 0, "%-5s%*s%9s  %55s",
    132 	    "Disk", hlen, header, "Used",
    133 	    "/0%  /10% /20% /30% /40% /50% /60% /70% /80% /90% /100%");
    134 }
    135 
    136 void
    137 showswap(void)
    138 {
    139 	int	col, blk_div, i, avail, used, xsize, swp_free;
    140 	struct	swapent *sep;
    141 	char	*p;
    142 
    143 	blk_div = blocksize / 512;
    144 	swp_free = avail = 0;
    145 	for (sep = swap_devices, i = 0; i < nswap; i++, sep++) {
    146 		if (sep == NULL)
    147 			continue;
    148 
    149 		p = strrchr(sep->se_path, '/');
    150 		p = p ? p+1 : sep->se_path;
    151 
    152 		mvwprintw(wnd, i + 1, 0, "%-5s", p);
    153 
    154 		col = 5;
    155 		mvwprintw(wnd, i + 1, col, "%*d", hlen, sep->se_nblks / blk_div);
    156 
    157 		col += hlen;
    158 		xsize = sep->se_nblks;
    159 		used = sep->se_inuse;
    160 		avail += xsize;
    161 		swp_free += xsize - used;
    162 		mvwprintw(wnd, i + 1, col, "%9d  ", used / blk_div);
    163 		wclrtoeol(wnd);
    164 		whline(wnd, 'X', (100 * used / xsize + 1) / 2);
    165 	}
    166 	/* do total if necessary */
    167 	if (nswap > 1) {
    168 		used = avail - swp_free;
    169 		mvwprintw(wnd, i + 1, 0, "%-5s%*d%9d  ",
    170 		    "Total", hlen, avail / blk_div, used / blk_div);
    171 		wclrtoeol(wnd);
    172 		whline(wnd, 'X', (100 * used / avail + 1) / 2);
    173 	}
    174 }
    175