swap.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1980, 1992, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 4. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33
34__FBSDID("$FreeBSD: stable/11/usr.bin/systat/swap.c 330897 2018-03-14 03:19:51Z eadler $");
35
36#ifdef lint
37static const char sccsid[] = "@(#)swap.c	8.3 (Berkeley) 4/29/95";
38#endif
39
40/*
41 * swapinfo - based on a program of the same name by Kevin Lahey
42 */
43
44#include <sys/param.h>
45#include <sys/ioctl.h>
46#include <sys/stat.h>
47
48#include <kvm.h>
49#include <nlist.h>
50#include <stdio.h>
51#include <stdlib.h>
52#include <unistd.h>
53#include <string.h>
54#include <err.h>
55
56#include "systat.h"
57#include "extern.h"
58
59kvm_t	*kd;
60
61static char *header;
62static long blocksize;
63static int dlen, odlen;
64static int hlen;
65static int ulen, oulen;
66static int pagesize;
67
68WINDOW *
69openswap(void)
70{
71	return (subwin(stdscr, LINES-3-1, 0, MAINWIN_ROW, 0));
72}
73
74void
75closeswap(WINDOW *w)
76{
77	if (w == NULL)
78		return;
79	wclear(w);
80	wrefresh(w);
81	delwin(w);
82}
83
84/*
85 * The meat of all the swap stuff is stolen from pstat(8)'s
86 * swapmode(), which is based on a program called swapinfo written by
87 * Kevin Lahey <kml@rokkaku.atl.ga.us>.
88 */
89
90#define NSWAP	16
91
92static struct kvm_swap kvmsw[NSWAP];
93static int kvnsw, okvnsw;
94
95static void calclens(void);
96
97#define CONVERT(v)	((int)((int64_t)(v) * pagesize / blocksize))
98
99static void
100calclens(void)
101{
102	int i, n;
103	int len;
104
105	dlen = sizeof("Disk");
106	for (i = 0; i < kvnsw; ++i) {
107		len = strlen(kvmsw[i].ksw_devname);
108		if (dlen < len)
109			dlen = len;
110	}
111
112	ulen = sizeof("Used");
113	for (n = CONVERT(kvmsw[kvnsw].ksw_used), len = 2; n /= 10; ++len);
114	if (ulen < len)
115		ulen = len;
116}
117
118int
119initswap(void)
120{
121	static int once = 0;
122
123	if (once)
124		return (1);
125
126	header = getbsize(&hlen, &blocksize);
127	pagesize = getpagesize();
128
129	if ((kvnsw = kvm_getswapinfo(kd, kvmsw, NSWAP, 0)) < 0) {
130		error("systat: kvm_getswapinfo failed");
131		return (0);
132	}
133	okvnsw = kvnsw;
134
135	calclens();
136	odlen = dlen;
137	oulen = ulen;
138
139	once = 1;
140	return (1);
141}
142
143void
144fetchswap(void)
145{
146
147	okvnsw = kvnsw;
148	if ((kvnsw = kvm_getswapinfo(kd, kvmsw, NSWAP, 0)) < 0) {
149		error("systat: kvm_getswapinfo failed");
150		return;
151	}
152
153	odlen = dlen;
154	oulen = ulen;
155	calclens();
156}
157
158void
159labelswap(void)
160{
161	const char *name;
162	int i;
163
164	fetchswap();
165
166	werase(wnd);
167
168	mvwprintw(wnd, 0, 0, "%*s%*s%*s %s",
169	    -dlen, "Disk", hlen, header, ulen, "Used",
170	    "/0%  /10  /20  /30  /40  /50  /60  /70  /80  /90  /100");
171
172	for (i = 0; i <= kvnsw; ++i) {
173		if (i == kvnsw) {
174			if (kvnsw == 1)
175				break;
176			name = "Total";
177		} else
178			name = kvmsw[i].ksw_devname;
179		mvwprintw(wnd, i + 1, 0, "%*s", -dlen, name);
180	}
181}
182
183void
184showswap(void)
185{
186	int count;
187	int i;
188
189	if (kvnsw != okvnsw || dlen != odlen || ulen != oulen)
190		labelswap();
191
192	for (i = 0; i <= kvnsw; ++i) {
193		if (i == kvnsw) {
194			if (kvnsw == 1)
195				break;
196		}
197
198		if (kvmsw[i].ksw_total == 0) {
199			mvwprintw(
200			    wnd,
201			    i + 1,
202			    dlen + hlen + ulen + 1,
203			    "(swap not configured)"
204			);
205			continue;
206		}
207
208		wmove(wnd, i + 1, dlen);
209
210		wprintw(wnd, "%*d", hlen, CONVERT(kvmsw[i].ksw_total));
211		wprintw(wnd, "%*d", ulen, CONVERT(kvmsw[i].ksw_used));
212
213		count = 50.0 * kvmsw[i].ksw_used / kvmsw[i].ksw_total + 1;
214
215		waddch(wnd, ' ');
216		while (count--)
217			waddch(wnd, 'X');
218		wclrtoeol(wnd);
219	}
220}
221