xref: /netbsd-src/bin/ps/nlist.c (revision e960fc946b552cfd0d0fd34670f66549020d0074)
1 /*	$NetBSD: nlist.c,v 1.28 2020/08/26 10:54:12 simonb Exp $	*/
2 
3 /*
4  * Copyright (c) 2000 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Simon Burge.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29  * POSSIBILITY OF SUCH DAMAGE.
30  */
31 
32 /*
33  * Copyright (c) 1990, 1993, 1994
34  *	The Regents of the University of California.  All rights reserved.
35  *
36  * Redistribution and use in source and binary forms, with or without
37  * modification, are permitted provided that the following conditions
38  * are met:
39  * 1. Redistributions of source code must retain the above copyright
40  *    notice, this list of conditions and the following disclaimer.
41  * 2. Redistributions in binary form must reproduce the above copyright
42  *    notice, this list of conditions and the following disclaimer in the
43  *    documentation and/or other materials provided with the distribution.
44  * 3. Neither the name of the University nor the names of its contributors
45  *    may be used to endorse or promote products derived from this software
46  *    without specific prior written permission.
47  *
48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58  * SUCH DAMAGE.
59  */
60 
61 #include <sys/cdefs.h>
62 #ifndef lint
63 #if 0
64 static char sccsid[] = "@(#)nlist.c	8.4 (Berkeley) 4/2/94";
65 #else
66 __RCSID("$NetBSD: nlist.c,v 1.28 2020/08/26 10:54:12 simonb Exp $");
67 #endif
68 #endif /* not lint */
69 
70 #include <sys/param.h>
71 #include <sys/time.h>
72 #include <sys/lwp.h>
73 #include <sys/proc.h>
74 #include <sys/resource.h>
75 #include <sys/sysctl.h>
76 
77 #include <err.h>
78 #include <errno.h>
79 #include <kvm.h>
80 #include <math.h>
81 #include <nlist.h>
82 #include <stdio.h>
83 #include <string.h>
84 #include <unistd.h>
85 
86 #include "ps.h"
87 
88 struct	nlist psnl[] = {
89 	{ .n_name = "_fscale" },
90 #define	X_FSCALE	0
91 	{ .n_name = "_ccpu" },
92 #define	X_CCPU		1
93 	{ .n_name = "_physmem" },
94 #define	X_PHYSMEM	2
95 	{ .n_name = "_maxslp" },
96 #define	X_MAXSLP	3
97 	{ .n_name = NULL }
98 };
99 
100 double	log_ccpu;			/* log of kernel _ccpu variable */
101 int	nlistread;			/* if nlist already read. */
102 int	mempages;			/* number of pages of phys. memory */
103 int	fscale;				/* kernel _fscale variable */
104 int	maxslp;				/* kernel _maxslp variable */
105 int	uspace;				/* kernel USPACE value */
106 
107 /* XXX Hopefully reasonable default */
108 #define MEMPAGES 	0
109 #ifndef FSCALE
110 #define FSCALE		(1 << 8)
111 #endif
112 #define LOG_CCPU	(-1.0 / 20.0)
113 #ifndef MAXSLP
114 #define MAXSLP		20
115 #endif
116 #define DEF_USPACE	(getpagesize())
117 
118 #define	kread(x, v) \
119 	kvm_read(kd, psnl[x].n_value, (char *)&v, sizeof v) != sizeof(v)
120 
121 void
donlist(void)122 donlist(void)
123 {
124 	fixpt_t xccpu;
125 
126 	nlistread = 1;
127 
128 	if (kvm_nlist(kd, psnl)) {
129 		nlisterr(psnl);
130 		eval = 1;
131 		fscale = FSCALE;
132 		mempages = MEMPAGES;
133 		log_ccpu = LOG_CCPU;
134 		maxslp = MAXSLP;
135 		return;
136 	}
137 
138 	if (kread(X_FSCALE, fscale)) {
139 		warnx("fscale: %s", kvm_geterr(kd));
140 		eval = 1;
141 		fscale = FSCALE;
142 	}
143 
144 	if (kread(X_PHYSMEM, mempages)) {
145 		warnx("avail_start: %s", kvm_geterr(kd));
146 		eval = 1;
147 		mempages = MEMPAGES;
148 	}
149 
150 	if (kread(X_CCPU, xccpu)) {
151 		warnx("ccpu: %s", kvm_geterr(kd));
152 		eval = 1;
153 		log_ccpu = LOG_CCPU;
154 	} else
155 		log_ccpu = log((double)xccpu / fscale);
156 
157 	if (kread(X_MAXSLP, maxslp)) {
158 		warnx("maxslp: %s", kvm_geterr(kd));
159 		eval = 1;
160 		maxslp = MAXSLP;
161 	}
162 }
163 
164 void
donlist_sysctl(void)165 donlist_sysctl(void)
166 {
167 	int mib[2];
168 	size_t size;
169 	fixpt_t xccpu;
170 	uint64_t memsize;
171 
172 	nlistread = 1;
173 
174 	mib[0] = CTL_KERN;
175 	mib[1] = KERN_FSCALE;
176 	size = sizeof(fscale);
177 	if (sysctl(mib, 2, &fscale, &size, NULL, 0)) {
178 		warn("sysctl kern.fscale");
179 		eval = 1;
180 		fscale = FSCALE;
181 	}
182 
183 	mib[0] = CTL_HW;
184 	mib[1] = HW_PHYSMEM64;
185 	size = sizeof(memsize);
186 	if (sysctl(mib, 2, &memsize, &size, NULL, 0)) {
187 		warn("sysctl hw.avail_start");
188 		eval = 1;
189 		mempages = MEMPAGES;
190 	} else
191 		mempages = memsize / getpagesize();
192 
193 	mib[0] = CTL_KERN;
194 	mib[1] = KERN_CCPU;
195 	size = sizeof(xccpu);
196 	if (sysctl(mib, 2, &xccpu, &size, NULL, 0)) {
197 		warn("sysctl kern.ccpu");
198 		eval = 1;
199 		log_ccpu = LOG_CCPU;
200 	} else
201 		log_ccpu = log((double)xccpu / fscale);
202 
203 	mib[0] = CTL_VM;
204 	mib[1] = VM_MAXSLP;
205 	size = sizeof(maxslp);
206 	if (sysctl(mib, 2, &maxslp, &size, NULL, 0)) {
207 		warn("sysctl vm.maxslp");
208 		eval = 1;
209 		maxslp = MAXSLP;
210 	}
211 
212 	mib[0] = CTL_VM;
213 	mib[1] = VM_USPACE;
214 	size = sizeof(uspace);
215 	if (sysctl(mib, 2, &uspace, &size, NULL, 0)) {
216 		warn("sysctl vm.uspace");
217 		eval = 1;
218 		uspace = DEF_USPACE;
219 	}
220 }
221 
222 void
nlisterr(struct nlist nl[])223 nlisterr(struct nlist nl[])
224 {
225 	int i;
226 
227 	(void)fprintf(stderr, "ps: nlist: can't find following symbols:");
228 	for (i = 0; nl[i].n_name != NULL; i++)
229 		if (nl[i].n_value == 0)
230 			(void)fprintf(stderr, " %s", nl[i].n_name);
231 	(void)fprintf(stderr, "\n");
232 }
233