1 /* $OpenBSD: nlist.c,v 1.22 2021/12/01 18:21:23 deraadt Exp $ */
2 /* $NetBSD: nlist.c,v 1.11 1995/03/21 09:08:03 cgd Exp $ */
3
4 /*-
5 * Copyright (c) 1990, 1993, 1994
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include <sys/time.h>
34 #include <sys/signal.h>
35 #include <sys/resource.h>
36 #include <sys/sysctl.h>
37
38 #include <err.h>
39 #include <errno.h>
40 #include <kvm.h>
41 #include <nlist.h>
42 #include <stdio.h>
43 #include <string.h>
44 #include <unistd.h>
45
46 #include "ps.h"
47
48 struct nlist psnl[] = {
49 {"_fscale"},
50 #define X_FSCALE 0
51 {"_ccpu"},
52 #define X_CCPU 1
53 {"_physmem"},
54 #define X_PHYSMEM 2
55 {"_maxslp"},
56 #define X_MAXSLP 3
57 {NULL}
58 };
59
60 fixpt_t ccpu; /* kernel _ccpu variable */
61 int nlistread; /* if nlist already read. */
62 u_int mempages; /* number of pages of phys. memory */
63 int fscale; /* kernel _fscale variable */
64 int maxslp;
65
66 extern kvm_t *kd;
67
68 #define kread(x, v) \
69 kvm_read(kd, psnl[x].n_value, &v, sizeof v) != sizeof(v)
70
71 int
donlist(void)72 donlist(void)
73 {
74 int64_t physmem;
75 int rval, mib[2];
76 size_t siz;
77
78 rval = 0;
79 nlistread = 1;
80
81 if (kd != NULL && !kvm_sysctl_only) {
82 if (kvm_nlist(kd, psnl)) {
83 nlisterr(psnl);
84 eval = 1;
85 return (1);
86 }
87 if (kread(X_FSCALE, fscale)) {
88 warnx("fscale: %s", kvm_geterr(kd));
89 eval = rval = 1;
90 }
91 if (kread(X_PHYSMEM, mempages)) {
92 warnx("physmem: %s", kvm_geterr(kd));
93 eval = rval = 1;
94 }
95 if (kread(X_CCPU, ccpu)) {
96 warnx("ccpu: %s", kvm_geterr(kd));
97 eval = rval = 1;
98 }
99 if (kread(X_MAXSLP, maxslp)) {
100 warnx("maxslp: %s", kvm_geterr(kd));
101 eval = rval = 1;
102 }
103 } else {
104 siz = sizeof (fscale);
105 mib[0] = CTL_KERN;
106 mib[1] = KERN_FSCALE;
107 if (sysctl(mib, 2, &fscale, &siz, NULL, 0) == -1) {
108 warnx("fscale: failed to get kern.fscale");
109 eval = rval = 1;
110 }
111 siz = sizeof (physmem);
112 mib[0] = CTL_HW;
113 mib[1] = HW_PHYSMEM64;
114 if (sysctl(mib, 2, &physmem, &siz, NULL, 0) == -1) {
115 warnx("physmem: failed to get hw.physmem");
116 eval = rval = 1;
117 }
118 /* translate bytes into page count */
119 mempages = physmem / getpagesize();
120 siz = sizeof (ccpu);
121 mib[0] = CTL_KERN;
122 mib[1] = KERN_CCPU;
123 if (sysctl(mib, 2, &ccpu, &siz, NULL, 0) == -1) {
124 warnx("ccpu: failed to get kern.ccpu");
125 eval = rval = 1;
126 }
127 siz = sizeof (maxslp);
128 mib[0] = CTL_VM;
129 mib[1] = VM_MAXSLP;
130 if (sysctl(mib, 2, &maxslp, &siz, NULL, 0) == -1) {
131 warnx("maxslp: failed to get vm.maxslp");
132 eval = rval = 1;
133 }
134 }
135 return (rval);
136 }
137
138 void
nlisterr(struct nlist nl[])139 nlisterr(struct nlist nl[])
140 {
141 int i;
142
143 (void)fprintf(stderr, "ps: nlist: can't find following symbols:");
144 for (i = 0; nl[i].n_name != NULL; i++)
145 if (nl[i].n_value == 0)
146 (void)fprintf(stderr, " %s", nl[i].n_name);
147 (void)fprintf(stderr, "\n");
148 }
149