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/types.h> 29 #include <sys/sysctl.h> 30 #include <sys/user.h> 31 #include <stdlib.h> 32 #include <string.h> 33 34 #include "libutil.h" 35 36 static struct kinfo_vmobject * 37 kinfo_getvmobject_impl(int *cntp, const char *vmobjsysctl) 38 { 39 char *buf, *bp, *ep; 40 struct kinfo_vmobject *kvo, *list, *kp; 41 size_t len; 42 int cnt, i; 43 44 buf = NULL; 45 for (i = 0; i < 3; i++) { 46 if (sysctlbyname(vmobjsysctl, NULL, &len, NULL, 0) < 0) { 47 free(buf); 48 return (NULL); 49 } 50 buf = reallocf(buf, len); 51 if (buf == NULL) 52 return (NULL); 53 if (sysctlbyname(vmobjsysctl, buf, &len, NULL, 0) == 0) 54 goto unpack; 55 if (errno != ENOMEM) { 56 free(buf); 57 return (NULL); 58 } 59 } 60 free(buf); 61 return (NULL); 62 63 unpack: 64 /* Count items */ 65 cnt = 0; 66 bp = buf; 67 ep = buf + len; 68 while (bp < ep) { 69 kvo = (struct kinfo_vmobject *)(uintptr_t)bp; 70 bp += kvo->kvo_structsize; 71 cnt++; 72 } 73 74 list = calloc(cnt, sizeof(*list)); 75 if (list == NULL) { 76 free(buf); 77 return (NULL); 78 } 79 80 /* Unpack */ 81 bp = buf; 82 kp = list; 83 while (bp < ep) { 84 kvo = (struct kinfo_vmobject *)(uintptr_t)bp; 85 memcpy(kp, kvo, kvo->kvo_structsize); 86 bp += kvo->kvo_structsize; 87 kp->kvo_structsize = sizeof(*kp); 88 kp++; 89 } 90 free(buf); 91 *cntp = cnt; 92 return (list); 93 } 94 95 struct kinfo_vmobject * 96 kinfo_getvmobject(int *cntp) 97 { 98 return (kinfo_getvmobject_impl(cntp, "vm.objects")); 99 } 100 101 struct kinfo_vmobject * 102 kinfo_getswapvmobject(int *cntp) 103 { 104 return (kinfo_getvmobject_impl(cntp, "vm.swap_objects")); 105 } 106