swap.c revision 200420 
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: head/usr.bin/systat/swap.c 200420 2009-12-11 23:35:38Z delphij $");
37
38#ifdef lint
39static 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
57#include "systat.h"
58#include "extern.h"
59
60kvm_t	*kd;
61
62static char *header;
63static long blocksize;
64static int dlen, odlen;
65static int hlen;
66static int ulen, oulen;
67static int pagesize;
68
69WINDOW *
70openswap(void)
71{
72	return (subwin(stdscr, LINES-3-1, 0, MAINWIN_ROW, 0));
73}
74
75void
76closeswap(WINDOW *w)
77{
78	if (w == NULL)
79		return;
80	wclear(w);
81	wrefresh(w);
82	delwin(w);
83}
84
85/*
86 * The meat of all the swap stuff is stolen from pstat(8)'s
87 * swapmode(), which is based on a program called swapinfo written by
88 * Kevin Lahey <kml@rokkaku.atl.ga.us>.
89 */
90
91#define NSWAP	16
92
93static struct kvm_swap kvmsw[NSWAP];
94static int kvnsw, okvnsw;
95
96static void calclens(void);
97
98#define CONVERT(v)	((int)((int64_t)(v) * pagesize / blocksize))
99
100static void
101calclens(void)
102{
103	int i, n;
104	int len;
105
106	dlen = sizeof("Disk");
107	for (i = 0; i < kvnsw; ++i) {
108		len = strlen(kvmsw[i].ksw_devname);
109		if (dlen < len)
110			dlen = len;
111	}
112
113	ulen = sizeof("Used");
114	for (n = CONVERT(kvmsw[kvnsw].ksw_used), len = 2; n /= 10; ++len);
115	if (ulen < len)
116		ulen = len;
117}
118
119int
120initswap(void)
121{
122	static int once = 0;
123
124	if (once)
125		return (1);
126
127	header = getbsize(&hlen, &blocksize);
128	pagesize = getpagesize();
129
130	if ((kvnsw = kvm_getswapinfo(kd, kvmsw, NSWAP, 0)) < 0) {
131		error("systat: kvm_getswapinfo failed");
132		return (0);
133	}
134	okvnsw = kvnsw;
135
136	calclens();
137	odlen = dlen;
138	oulen = ulen;
139
140	once = 1;
141	return (1);
142}
143
144void
145fetchswap(void)
146{
147
148	okvnsw = kvnsw;
149	if ((kvnsw = kvm_getswapinfo(kd, kvmsw, NSWAP, 0)) < 0) {
150		error("systat: kvm_getswapinfo failed");
151		return;
152	}
153
154	odlen = dlen;
155	oulen = ulen;
156	calclens();
157}
158
159void
160labelswap(void)
161{
162	const char *name;
163	int i;
164
165	fetchswap();
166
167	werase(wnd);
168
169	mvwprintw(wnd, 0, 0, "%*s%*s%*s %s",
170	    -dlen, "Disk", hlen, header, ulen, "Used",
171	    "/0%  /10  /20  /30  /40  /50  /60  /70  /80  /90  /100");
172
173	for (i = 0; i <= kvnsw; ++i) {
174		if (i == kvnsw) {
175			if (kvnsw == 1)
176				break;
177			name = "Total";
178		} else
179			name = kvmsw[i].ksw_devname;
180		mvwprintw(wnd, i + 1, 0, "%*s", -dlen, name);
181	}
182}
183
184void
185showswap(void)
186{
187	int count;
188	int i;
189
190	if (kvnsw != okvnsw || dlen != odlen || ulen != oulen)
191		labelswap();
192
193	for (i = 0; i <= kvnsw; ++i) {
194		if (i == kvnsw) {
195			if (kvnsw == 1)
196				break;
197		}
198
199		if (kvmsw[i].ksw_total == 0) {
200			mvwprintw(
201			    wnd,
202			    i + 1,
203			    dlen + hlen + ulen + 1,
204			    "(swap not configured)"
205			);
206			continue;
207		}
208
209		wmove(wnd, i + 1, dlen);
210
211		wprintw(wnd, "%*d", hlen, CONVERT(kvmsw[i].ksw_total));
212		wprintw(wnd, "%*d", ulen, CONVERT(kvmsw[i].ksw_used));
213
214		count = 50.0 * kvmsw[i].ksw_used / kvmsw[i].ksw_total + 1;
215
216		waddch(wnd, ' ');
217		while (count--)
218			waddch(wnd, 'X');
219		wclrtoeol(wnd);
220	}
221}
222