asysctl.c revision 1.1.2.2
1 1.1.2.2 tls /* $NetBSD: asysctl.c,v 1.1.2.2 2014/08/10 06:51:50 tls Exp $ */ 2 1.1.2.2 tls 3 1.1.2.2 tls /*- 4 1.1.2.2 tls * Copyright (c) 2014 The NetBSD Foundation, Inc. 5 1.1.2.2 tls * All rights reserved. 6 1.1.2.2 tls * 7 1.1.2.2 tls * This code is derived from software contributed to The NetBSD Foundation 8 1.1.2.2 tls * by Joerg Sonnenberger. 9 1.1.2.2 tls * 10 1.1.2.2 tls * Redistribution and use in source and binary forms, with or without 11 1.1.2.2 tls * modification, are permitted provided that the following conditions 12 1.1.2.2 tls * are met: 13 1.1.2.2 tls * 1. Redistributions of source code must retain the above copyright 14 1.1.2.2 tls * notice, this list of conditions and the following disclaimer. 15 1.1.2.2 tls * 2. Redistributions in binary form must reproduce the above copyright 16 1.1.2.2 tls * notice, this list of conditions and the following disclaimer in the 17 1.1.2.2 tls * documentation and/or other materials provided with the distribution. 18 1.1.2.2 tls * 19 1.1.2.2 tls * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.1.2.2 tls * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.1.2.2 tls * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.1.2.2 tls * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.1.2.2 tls * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.1.2.2 tls * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.1.2.2 tls * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.1.2.2 tls * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.1.2.2 tls * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.1.2.2 tls * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.1.2.2 tls * POSSIBILITY OF SUCH DAMAGE. 30 1.1.2.2 tls */ 31 1.1.2.2 tls 32 1.1.2.2 tls #include <sys/cdefs.h> 33 1.1.2.2 tls __RCSID("$NetBSD: asysctl.c,v 1.1.2.2 2014/08/10 06:51:50 tls Exp $"); 34 1.1.2.2 tls 35 1.1.2.2 tls #include "namespace.h" 36 1.1.2.2 tls #include <sys/sysctl.h> 37 1.1.2.2 tls #include <errno.h> 38 1.1.2.2 tls #include <limits.h> 39 1.1.2.2 tls #include <stdlib.h> 40 1.1.2.2 tls 41 1.1.2.2 tls __weak_alias(asysctl,_asysctl) 42 1.1.2.2 tls __weak_alias(asysctlbyname,_asysctlbyname) 43 1.1.2.2 tls 44 1.1.2.2 tls void * 45 1.1.2.2 tls asysctl(const int *oids, size_t oidlen, size_t *len) 46 1.1.2.2 tls { 47 1.1.2.2 tls void *data; 48 1.1.2.2 tls 49 1.1.2.2 tls *len = 0; 50 1.1.2.2 tls data = NULL; 51 1.1.2.2 tls 52 1.1.2.2 tls for (;;) { 53 1.1.2.2 tls if (sysctl(oids, oidlen, data, len, NULL, 0) == 0) { 54 1.1.2.2 tls if (*len == 0) { 55 1.1.2.2 tls free(data); 56 1.1.2.2 tls return NULL; 57 1.1.2.2 tls } 58 1.1.2.2 tls if (data != NULL) 59 1.1.2.2 tls return data; 60 1.1.2.2 tls errno = ENOMEM; 61 1.1.2.2 tls } 62 1.1.2.2 tls free(data); 63 1.1.2.2 tls if (errno == ENOMEM && *len != SIZE_MAX) { 64 1.1.2.2 tls if (*len > SIZE_MAX / 2) 65 1.1.2.2 tls *len = SIZE_MAX; 66 1.1.2.2 tls else 67 1.1.2.2 tls *len *= 2; 68 1.1.2.2 tls data = malloc(*len); 69 1.1.2.2 tls if (data == NULL) { 70 1.1.2.2 tls *len = SIZE_MAX; 71 1.1.2.2 tls return NULL; 72 1.1.2.2 tls } 73 1.1.2.2 tls continue; 74 1.1.2.2 tls } 75 1.1.2.2 tls *len = SIZE_MAX; 76 1.1.2.2 tls return NULL; 77 1.1.2.2 tls } 78 1.1.2.2 tls } 79 1.1.2.2 tls 80 1.1.2.2 tls void * 81 1.1.2.2 tls asysctlbyname(const char *gname, size_t *len) 82 1.1.2.2 tls { 83 1.1.2.2 tls int name[CTL_MAXNAME]; 84 1.1.2.2 tls u_int namelen; 85 1.1.2.2 tls 86 1.1.2.2 tls if (sysctlgetmibinfo(gname, &name[0], &namelen, NULL, NULL, NULL, 87 1.1.2.2 tls SYSCTL_VERSION)) { 88 1.1.2.2 tls *len = SIZE_MAX; 89 1.1.2.2 tls return NULL; 90 1.1.2.2 tls } 91 1.1.2.2 tls return asysctl(&name[0], namelen, len); 92 1.1.2.2 tls } 93
Indexes created Sat Sep 27 22:09:54 GMT 2025