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 #include <sys/types.h> 30 #include <sys/sysctl.h> 31 #include <sys/user.h> 32 #include <stdlib.h> 33 #include <string.h> 34 35 #include "libutil.h" 36 37 static struct kinfo_vmobject * 38 kinfo_getvmobject_impl(int *cntp, const char *vmobjsysctl) 39 { 40 char *buf, *bp, *ep; 41 struct kinfo_vmobject *kvo, *list, *kp; 42 size_t len; 43 int cnt, i; 44 45 buf = NULL; 46 for (i = 0; i < 3; i++) { 47 if (sysctlbyname(vmobjsysctl, NULL, &len, NULL, 0) < 0) { 48 free(buf); 49 return (NULL); 50 } 51 buf = reallocf(buf, len); 52 if (buf == NULL) 53 return (NULL); 54 if (sysctlbyname(vmobjsysctl, buf, &len, NULL, 0) == 0) 55 goto unpack; 56 if (errno != ENOMEM) { 57 free(buf); 58 return (NULL); 59 } 60 } 61 free(buf); 62 return (NULL); 63 64 unpack: 65 /* Count items */ 66 cnt = 0; 67 bp = buf; 68 ep = buf + len; 69 while (bp < ep) { 70 kvo = (struct kinfo_vmobject *)(uintptr_t)bp; 71 bp += kvo->kvo_structsize; 72 cnt++; 73 } 74 75 list = calloc(cnt, sizeof(*list)); 76 if (list == NULL) { 77 free(buf); 78 return (NULL); 79 } 80 81 /* Unpack */ 82 bp = buf; 83 kp = list; 84 while (bp < ep) { 85 kvo = (struct kinfo_vmobject *)(uintptr_t)bp; 86 memcpy(kp, kvo, kvo->kvo_structsize); 87 bp += kvo->kvo_structsize; 88 kp->kvo_structsize = sizeof(*kp); 89 kp++; 90 } 91 free(buf); 92 *cntp = cnt; 93 return (list); 94 } 95 96 struct kinfo_vmobject * 97 kinfo_getvmobject(int *cntp) 98 { 99 return (kinfo_getvmobject_impl(cntp, "vm.objects")); 100 } 101 102 struct kinfo_vmobject * 103 kinfo_getswapvmobject(int *cntp) 104 { 105 return (kinfo_getvmobject_impl(cntp, "vm.swap_objects")); 106 } 107