1/*	$OpenBSD: swap.c,v 1.28 2019/06/28 13:35:04 deraadt Exp $	*/
2/*	$NetBSD: swap.c,v 1.9 1998/12/26 07:05:08 marc Exp $	*/
3
4/*-
5 * Copyright (c) 1997 Matthew R. Green.  All rights reserved.
6 * Copyright (c) 1980, 1992, 1993
7 *	The Regents of the University of California.  All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. 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/types.h>
35#include <sys/signal.h>
36#include <sys/conf.h>
37#include <sys/ioctl.h>
38#include <sys/stat.h>
39#include <sys/swap.h>
40
41#include <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44#include <errno.h>
45#include <unistd.h>
46
47#include "systat.h"
48
49
50static	long blocksize;
51static	int hlen, nswap, rnswap;
52static	struct swapent *swap_devices;
53
54void print_sw(void);
55int read_sw(void);
56int select_sw(void);
57static void showswap(int i);
58static void showtotal(void);
59
60
61field_def fields_sw[] = {
62	{"DISK", 6, 16, 1, FLD_ALIGN_LEFT, -1, 0, 0, 0},
63	{"BLOCKS", 5, 10, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0},
64	{"USED", 5, 10, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0},
65	{"", 40, 80, 1, FLD_ALIGN_BAR, -1, 0, 0, 100},
66};
67
68#define FLD_SW_NAME	FIELD_ADDR(fields_sw,0)
69#define FLD_SW_BLOCKS	FIELD_ADDR(fields_sw,1)
70#define FLD_SW_USED	FIELD_ADDR(fields_sw,2)
71#define FLD_SW_BAR	FIELD_ADDR(fields_sw,3)
72
73/* Define views */
74field_def *view_sw_0[] = {
75	FLD_SW_NAME, FLD_SW_BLOCKS, FLD_SW_USED, FLD_SW_BAR, NULL
76};
77
78
79/* Define view managers */
80struct view_manager swap_mgr = {
81	"Swap", select_sw, read_sw, NULL, print_header,
82	print_sw, keyboard_callback, NULL, NULL
83};
84
85field_view views_sw[] = {
86	{view_sw_0, "swap", '6', &swap_mgr},
87	{NULL, NULL, 0, NULL}
88};
89
90
91int
92select_sw(void)
93{
94	if (swap_devices == NULL || nswap == 0)
95		num_disp = 1;
96	else
97		num_disp = nswap;
98	if (nswap > 1)
99		num_disp++;
100	return (0);
101}
102
103int
104read_sw(void)
105{
106	num_disp = 1;
107
108	nswap = swapctl(SWAP_NSWAP, 0, 0);
109
110	if (nswap < 0)
111		error("error: %s", strerror(errno));
112	if (nswap == 0)
113		return 0;
114
115	if (swap_devices)
116		(void)free(swap_devices);
117
118	swap_devices = calloc(nswap, sizeof(*swap_devices));
119	if (swap_devices == NULL)
120		return 0;
121
122	rnswap = swapctl(SWAP_STATS, (void *)swap_devices, nswap);
123	if (rnswap == -1 || nswap != rnswap)
124		return 0;
125
126	num_disp = nswap;
127	if (nswap > 1)
128		num_disp++;
129
130	return 0;
131}
132
133
134void
135print_sw(void)
136{
137	int n, count = 0;
138
139	if (swap_devices == NULL || nswap == 0) {
140		print_fld_str(FLD_SW_BAR, "No swap devices");
141		return;
142	}
143
144
145	for (n = dispstart; n < num_disp; n++) {
146		if (n >= nswap)
147			showtotal();
148		else
149			showswap(n);
150		count++;
151		if (maxprint > 0 && count >= maxprint)
152			break;
153	}
154
155}
156
157int
158initswap(void)
159{
160	field_view *v;
161
162	char *bs = getbsize(&hlen, &blocksize);
163
164	FLD_SW_BLOCKS->title = strdup(bs);
165
166	for (v = views_sw; v->name != NULL; v++)
167		add_view(v);
168
169	return(1);
170}
171
172
173static void
174showswap(int i)
175{
176	int d, used, xsize;
177	struct	swapent *sep;
178	char	*p;
179
180	d = blocksize / 512;
181
182	sep = &swap_devices[i];
183
184	p = strrchr(sep->se_path, '/');
185	p = p ? p+1 : sep->se_path;
186
187	print_fld_str(FLD_SW_NAME, p);
188
189	xsize = sep->se_nblks;
190	used = sep->se_inuse;
191
192	print_fld_uint(FLD_SW_BLOCKS, xsize / d);
193	print_fld_uint(FLD_SW_USED, used / d);
194	print_fld_bar(FLD_SW_BAR, 100 * used / xsize);
195
196	end_line();
197}
198
199static void
200showtotal(void)
201{
202	struct	swapent *sep;
203	int	d, i, avail, used, xsize, mfree;
204
205	d = blocksize / 512;
206	mfree = avail = 0;
207
208	for (sep = swap_devices, i = 0; i < nswap; i++, sep++) {
209		xsize = sep->se_nblks;
210		used = sep->se_inuse;
211		avail += xsize;
212		mfree += xsize - used;
213	}
214	used = avail - mfree;
215
216	print_fld_str(FLD_SW_NAME, "Total");
217	print_fld_uint(FLD_SW_BLOCKS, avail / d);
218	print_fld_uint(FLD_SW_USED, used / d);
219	print_fld_bar(FLD_SW_BAR, 100 * used / avail);
220
221	end_line();
222}
223