2 * SPDX-License-Identifier: BSD-3-Clause
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32 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
37 static const char sccsid[] = "@(#)fetch.c 8.1 (Berkeley) 6/6/93";
40 #include <sys/types.h>
41 #include <sys/sysctl.h>
52 kvm_ckread(void *a, void *b, int l)
54 if (kvm_read(kd, (u_long)a, b, l) != l) {
56 error("error reading kmem at %p", a);
63 void getsysctl(const char *name, void *ptr, size_t len)
66 if (sysctlbyname(name, ptr, &nlen, NULL, 0) != 0) {
67 error("sysctl(%s...) failed: %s", name,
71 error("sysctl(%s...) expected %zu, got %zu", name, len, nlen);
76 * Read sysctl data with variable size. Try some times (with increasing
77 * buffers), fail if still too small.
78 * This is needed sysctls with possibly raplidly increasing data sizes,
79 * but imposes little overhead in the case of constant sizes.
80 * Returns NULL on error, or a pointer to freshly malloc()'ed memory that holds
82 * If szp is not NULL, the size of the returned data will be written into *szp.
85 /* Some defines: Number of tries. */
87 /* Percent of over-allocation (initial) */
90 * Factor for over-allocation in percent (the margin is increased by this on
94 /* Maximum supported MIB depth */
98 sysctl_dynread(const char *n, size_t *szp)
102 size_t mibsz = SD_MAXMIB;
103 size_t mrg = SD_MARGIN;
108 if (sysctlnametomib(n, mib, &mibsz) == -1) {
109 if (errno == ENOMEM) {
110 error("XXX: SD_MAXMIB too small, please bump!");
114 for (i = 0; i < SD_NTRIES; i++) {
115 /* get needed buffer size */
116 if (sysctl(mib, mibsz, NULL, &sz, NULL, 0) == -1)
118 sz += sz * mrg / 100;
119 if ((rv = (char *)malloc(sz)) == NULL) {
120 error("Out of memory!");
123 if (sysctl(mib, mibsz, rv, &sz, NULL, 0) == -1) {
126 if (errno == ENOMEM) {
127 mrg += mrg * SD_FACTOR / 100;