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nlist.c revision 1.16 
      1 /*	$NetBSD: nlist.c,v 1.16 2000/05/26 03:04:28 simonb Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990, 1993, 1994
      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  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 #if 0
     39 static char sccsid[] = "@(#)nlist.c	8.4 (Berkeley) 4/2/94";
     40 #else
     41 __RCSID("$NetBSD: nlist.c,v 1.16 2000/05/26 03:04:28 simonb Exp $");
     42 #endif
     43 #endif /* not lint */
     44 
     45 #include <sys/param.h>
     46 #include <sys/time.h>
     47 #include <sys/proc.h>
     48 #include <sys/resource.h>
     49 #include <sys/sysctl.h>
     50 
     51 #include <err.h>
     52 #include <errno.h>
     53 #include <kvm.h>
     54 #include <math.h>
     55 #include <nlist.h>
     56 #include <stdio.h>
     57 #include <string.h>
     58 #include <unistd.h>
     59 
     60 #include "ps.h"
     61 
     62 struct	nlist psnl[] = {
     63 	{ "_fscale" },
     64 #define	X_FSCALE	0
     65 	{ "_ccpu" },
     66 #define	X_CCPU		1
     67 	{ "_physmem" },
     68 #define	X_PHYSMEM	2
     69 	{ NULL }
     70 };
     71 
     72 double	ccpu;				/* kernel _ccpu variable */
     73 int	nlistread;			/* if nlist already read. */
     74 int	mempages;			/* number of pages of phys. memory */
     75 int	fscale;				/* kernel _fscale variable */
     76 
     77 #define kread(x, v) \
     78 	kvm_read(kd, psnl[x].n_value, (char *)&v, sizeof v) != sizeof(v)
     79 
     80 int
     81 donlist()
     82 {
     83 	int rval;
     84 	fixpt_t xccpu;
     85 
     86 	rval = 0;
     87 	nlistread = 1;
     88 	if (kvm_nlist(kd, psnl)) {
     89 		nlisterr(psnl);
     90 		eval = 1;
     91 		return (1);
     92 	}
     93 	if (kread(X_FSCALE, fscale)) {
     94 		warnx("fscale: %s", kvm_geterr(kd));
     95 		eval = rval = 1;
     96 	}
     97 	if (kread(X_PHYSMEM, mempages)) {
     98 		warnx("avail_start: %s", kvm_geterr(kd));
     99 		eval = rval = 1;
    100 	}
    101 	if (kread(X_CCPU, xccpu)) {
    102 		warnx("ccpu: %s", kvm_geterr(kd));
    103 		eval = rval = 1;
    104 	}
    105 	ccpu = (double)xccpu / fscale;
    106 	return (rval);
    107 }
    108 
    109 int
    110 donlist_sysctl()
    111 {
    112 	int mib[2];
    113 	size_t size;
    114 	fixpt_t xccpu;
    115 
    116 	nlistread = 1;
    117 	mib[0] = CTL_HW;
    118 	mib[1] = HW_PHYSMEM;
    119 	size = sizeof(mempages);
    120 	if (sysctl(mib, 2, &mempages, &size, NULL, 0) == 0)
    121 		mempages /= getpagesize();
    122 	else
    123 		mempages = 0;
    124 
    125 	mib[0] = CTL_KERN;
    126 	mib[1] = KERN_FSCALE;
    127 	size = sizeof(fscale);
    128 	if (sysctl(mib, 2, &fscale, &size, NULL, 0) == -1)
    129 		fscale = (1 << 8);	/* XXX Hopefully reasonable default */
    130 
    131 	mib[0] = CTL_KERN;
    132 	mib[1] = KERN_CCPU;
    133 	size = sizeof(xccpu);
    134 	if (sysctl(mib, 2, &xccpu, &size, NULL, 0) == -1)
    135 		ccpu = exp(-1.0 / 20.0); /* XXX Hopefully reasonable default */
    136 	else
    137 		ccpu = (double)xccpu / fscale;
    138 
    139 	return 0;
    140 }
    141 
    142 void
    143 nlisterr(nl)
    144 	struct nlist nl[];
    145 {
    146 	int i;
    147 
    148 	(void)fprintf(stderr, "ps: nlist: can't find following symbols:");
    149 	for (i = 0; nl[i].n_name != NULL; i++)
    150 		if (nl[i].n_value == 0)
    151 			(void)fprintf(stderr, " %s", nl[i].n_name);
    152 	(void)fprintf(stderr, "\n");
    153 }
    154