swap.c revision 331722 
172339Sabial/*-
272339Sabial * Copyright (c) 1980, 1992, 1993
372339Sabial *	The Regents of the University of California.  All rights reserved.
472339Sabial *
572339Sabial * Redistribution and use in source and binary forms, with or without
672339Sabial * modification, are permitted provided that the following conditions
772339Sabial * are met:
872339Sabial * 1. Redistributions of source code must retain the above copyright
972339Sabial *    notice, this list of conditions and the following disclaimer.
1072339Sabial * 2. Redistributions in binary form must reproduce the above copyright
1172339Sabial *    notice, this list of conditions and the following disclaimer in the
1272339Sabial *    documentation and/or other materials provided with the distribution.
1372339Sabial * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31
32__FBSDID("$FreeBSD: stable/11/usr.bin/systat/swap.c 331722 2018-03-29 02:50:57Z eadler $");
33
34#ifdef lint
35static const char sccsid[] = "@(#)swap.c	8.3 (Berkeley) 4/29/95";
36#endif
37
38/*
39 * swapinfo - based on a program of the same name by Kevin Lahey
40 */
41
42#include <sys/param.h>
43#include <sys/ioctl.h>
44#include <sys/stat.h>
45
46#include <kvm.h>
47#include <nlist.h>
48#include <stdio.h>
49#include <stdlib.h>
50#include <unistd.h>
51#include <string.h>
52#include <err.h>
53
54#include "systat.h"
55#include "extern.h"
56
57kvm_t	*kd;
58
59static char *header;
60static long blocksize;
61static int dlen, odlen;
62static int hlen;
63static int ulen, oulen;
64static int pagesize;
65
66WINDOW *
67openswap(void)
68{
69	return (subwin(stdscr, LINES-3-1, 0, MAINWIN_ROW, 0));
70}
71
72void
73closeswap(WINDOW *w)
74{
75	if (w == NULL)
76		return;
77	wclear(w);
78	wrefresh(w);
79	delwin(w);
80}
81
82/*
83 * The meat of all the swap stuff is stolen from pstat(8)'s
84 * swapmode(), which is based on a program called swapinfo written by
85 * Kevin Lahey <kml@rokkaku.atl.ga.us>.
86 */
87
88#define NSWAP	16
89
90static struct kvm_swap kvmsw[NSWAP];
91static int kvnsw, okvnsw;
92
93static void calclens(void);
94
95#define CONVERT(v)	((int)((int64_t)(v) * pagesize / blocksize))
96
97static void
98calclens(void)
99{
100	int i, n;
101	int len;
102
103	dlen = sizeof("Disk");
104	for (i = 0; i < kvnsw; ++i) {
105		len = strlen(kvmsw[i].ksw_devname);
106		if (dlen < len)
107			dlen = len;
108	}
109
110	ulen = sizeof("Used");
111	for (n = CONVERT(kvmsw[kvnsw].ksw_used), len = 2; n /= 10; ++len);
112	if (ulen < len)
113		ulen = len;
114}
115
116int
117initswap(void)
118{
119	static int once = 0;
120
121	if (once)
122		return (1);
123
124	header = getbsize(&hlen, &blocksize);
125	pagesize = getpagesize();
126
127	if ((kvnsw = kvm_getswapinfo(kd, kvmsw, NSWAP, 0)) < 0) {
128		error("systat: kvm_getswapinfo failed");
129		return (0);
130	}
131	okvnsw = kvnsw;
132
133	calclens();
134	odlen = dlen;
135	oulen = ulen;
136
137	once = 1;
138	return (1);
139}
140
141void
142fetchswap(void)
143{
144
145	okvnsw = kvnsw;
146	if ((kvnsw = kvm_getswapinfo(kd, kvmsw, NSWAP, 0)) < 0) {
147		error("systat: kvm_getswapinfo failed");
148		return;
149	}
150
151	odlen = dlen;
152	oulen = ulen;
153	calclens();
154}
155
156void
157labelswap(void)
158{
159	const char *name;
160	int i;
161
162	fetchswap();
163
164	werase(wnd);
165
166	mvwprintw(wnd, 0, 0, "%*s%*s%*s %s",
167	    -dlen, "Disk", hlen, header, ulen, "Used",
168	    "/0%  /10  /20  /30  /40  /50  /60  /70  /80  /90  /100");
169
170	for (i = 0; i <= kvnsw; ++i) {
171		if (i == kvnsw) {
172			if (kvnsw == 1)
173				break;
174			name = "Total";
175		} else
176			name = kvmsw[i].ksw_devname;
177		mvwprintw(wnd, i + 1, 0, "%*s", -dlen, name);
178	}
179}
180
181void
182showswap(void)
183{
184	int count;
185	int i;
186
187	if (kvnsw != okvnsw || dlen != odlen || ulen != oulen)
188		labelswap();
189
190	for (i = 0; i <= kvnsw; ++i) {
191		if (i == kvnsw) {
192			if (kvnsw == 1)
193				break;
194		}
195
196		if (kvmsw[i].ksw_total == 0) {
197			mvwprintw(
198			    wnd,
199			    i + 1,
200			    dlen + hlen + ulen + 1,
201			    "(swap not configured)"
202			);
203			continue;
204		}
205
206		wmove(wnd, i + 1, dlen);
207
208		wprintw(wnd, "%*d", hlen, CONVERT(kvmsw[i].ksw_total));
209		wprintw(wnd, "%*d", ulen, CONVERT(kvmsw[i].ksw_used));
210
211		count = 50.0 * kvmsw[i].ksw_used / kvmsw[i].ksw_total + 1;
212
213		waddch(wnd, ' ');
214		while (count--)
215			waddch(wnd, 'X');
216		wclrtoeol(wnd);
217	}
218}
219