1/* $NetBSD: asysctl.c,v 1.2 2017/01/10 17:45:58 christos Exp $ */ 2 3/*- 4 * Copyright (c) 2014 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Joerg Sonnenberger. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include <sys/cdefs.h> 33__RCSID("$NetBSD: asysctl.c,v 1.2 2017/01/10 17:45:58 christos Exp $"); 34 35#include "namespace.h" 36#include <sys/sysctl.h> 37#include <errno.h> 38#include <limits.h> 39#include <stdlib.h> 40 41__weak_alias(asysctl,_asysctl) 42__weak_alias(asysctlbyname,_asysctlbyname) 43 44void * 45asysctl(const int *oids, size_t oidlen, size_t *len) 46{ 47 void *data; 48 49 *len = 0; 50 data = NULL; 51 52 for (;;) { 53 if (sysctl(oids, (u_int)oidlen, data, len, NULL, 0) == 0) { 54 if (*len == 0) { 55 free(data); 56 return NULL; 57 } 58 if (data != NULL) 59 return data; 60 errno = ENOMEM; 61 } 62 free(data); 63 if (errno == ENOMEM && *len != SIZE_MAX) { 64 if (*len > SIZE_MAX / 2) 65 *len = SIZE_MAX; 66 else 67 *len *= 2; 68 data = malloc(*len); 69 if (data == NULL) { 70 *len = SIZE_MAX; 71 return NULL; 72 } 73 continue; 74 } 75 *len = SIZE_MAX; 76 return NULL; 77 } 78} 79 80void * 81asysctlbyname(const char *gname, size_t *len) 82{ 83 int name[CTL_MAXNAME]; 84 u_int namelen; 85 86 if (sysctlgetmibinfo(gname, &name[0], &namelen, NULL, NULL, NULL, 87 SYSCTL_VERSION)) { 88 *len = SIZE_MAX; 89 return NULL; 90 } 91 return asysctl(&name[0], namelen, len); 92} 93