2 * Copyright (c) 1980, 1992, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. 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.
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
39 static const char sccsid[] = "@(#)fetch.c 8.1 (Berkeley) 6/6/93";
42 #include <sys/types.h>
43 #include <sys/sysctl.h>
58 if (kvm_read(kd, (u_long)a, b, l) != l) {
60 error("error reading kmem at %p", a);
67 void getsysctl(name, ptr, len)
73 if (sysctlbyname(name, ptr, &nlen, NULL, 0) != 0) {
74 error("sysctl(%s...) failed: %s", name,
78 error("sysctl(%s...) expected %lu, got %lu", name,
79 (unsigned long)len, (unsigned long)nlen);
84 * Read sysctl data with variable size. Try some times (with increasing
85 * buffers), fail if still too small.
86 * This is needed sysctls with possibly raplidly increasing data sizes,
87 * but imposes little overhead in the case of constant sizes.
88 * Returns NULL on error, or a pointer to freshly malloc()'ed memory that holds
90 * If szp is not NULL, the size of the returned data will be written into *szp.
93 /* Some defines: Number of tries. */
95 /* Percent of over-allocation (initial) */
98 * Factor for over-allocation in percent (the margin is increased by this on
102 /* Maximum supported MIB depth */
106 sysctl_dynread(n, szp)
112 size_t mibsz = SD_MAXMIB;
113 size_t mrg = SD_MARGIN;
118 if (sysctlnametomib(n, mib, &mibsz) == -1) {
119 if (errno == ENOMEM) {
120 error("XXX: SD_MAXMIB too small, please bump!");
124 for (i = 0; i < SD_NTRIES; i++) {
125 /* get needed buffer size */
126 if (sysctl(mib, mibsz, NULL, &sz, NULL, 0) == -1)
128 sz += sz * mrg / 100;
129 if ((rv = (char *)malloc(sz)) == NULL) {
130 error("Out of memory!");
133 if (sysctl(mib, mibsz, rv, &sz, NULL, 0) == -1) {
136 if (errno == ENOMEM) {
137 mrg += mrg * SD_FACTOR / 100;