1 /* 2 * Copyright (c) 2013 Hudson River Trading LLC 3 * Written by: John H. Baldwin <jhb@FreeBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/types.h> 32 #include <sys/sysctl.h> 33 #include <sys/user.h> 34 #include <stdlib.h> 35 #include <string.h> 36 37 #include "libutil.h" 38 39 static struct kinfo_vmobject * 40 kinfo_getvmobject_impl(int *cntp, const char *vmobjsysctl) 41 { 42 char *buf, *bp, *ep; 43 struct kinfo_vmobject *kvo, *list, *kp; 44 size_t len; 45 int cnt, i; 46 47 buf = NULL; 48 for (i = 0; i < 3; i++) { 49 if (sysctlbyname(vmobjsysctl, NULL, &len, NULL, 0) < 0) { 50 free(buf); 51 return (NULL); 52 } 53 buf = reallocf(buf, len); 54 if (buf == NULL) 55 return (NULL); 56 if (sysctlbyname(vmobjsysctl, buf, &len, NULL, 0) == 0) 57 goto unpack; 58 if (errno != ENOMEM) { 59 free(buf); 60 return (NULL); 61 } 62 } 63 free(buf); 64 return (NULL); 65 66 unpack: 67 /* Count items */ 68 cnt = 0; 69 bp = buf; 70 ep = buf + len; 71 while (bp < ep) { 72 kvo = (struct kinfo_vmobject *)(uintptr_t)bp; 73 bp += kvo->kvo_structsize; 74 cnt++; 75 } 76 77 list = calloc(cnt, sizeof(*list)); 78 if (list == NULL) { 79 free(buf); 80 return (NULL); 81 } 82 83 /* Unpack */ 84 bp = buf; 85 kp = list; 86 while (bp < ep) { 87 kvo = (struct kinfo_vmobject *)(uintptr_t)bp; 88 memcpy(kp, kvo, kvo->kvo_structsize); 89 bp += kvo->kvo_structsize; 90 kp->kvo_structsize = sizeof(*kp); 91 kp++; 92 } 93 free(buf); 94 *cntp = cnt; 95 return (list); 96 } 97 98 struct kinfo_vmobject * 99 kinfo_getvmobject(int *cntp) 100 { 101 return (kinfo_getvmobject_impl(cntp, "vm.objects")); 102 } 103 104 struct kinfo_vmobject * 105 kinfo_getswapvmobject(int *cntp) 106 { 107 return (kinfo_getvmobject_impl(cntp, "vm.swap_objects")); 108 } 109