kvm_file.c revision 76176
1/*- 2 * Copyright (c) 1989, 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#if defined(LIBC_SCCS) && !defined(lint) 35#if 0 36static char sccsid[] = "@(#)kvm_file.c 8.1 (Berkeley) 6/4/93"; 37#else 38static const char rcsid[] = 39 "$FreeBSD: head/lib/libkvm/kvm_file.c 76176 2001-05-01 09:24:15Z markm $"; 40#endif 41#endif /* LIBC_SCCS and not lint */ 42 43/* 44 * File list interface for kvm. pstat, fstat and netstat are 45 * users of this code, so we've factored it out into a separate module. 46 * Thus, we keep this grunge out of the other kvm applications (i.e., 47 * most other applications are interested only in open/close/read/nlist). 48 */ 49 50#include <sys/param.h> 51#include <sys/lock.h> 52#include <sys/mutex.h> 53#include <sys/user.h> 54#include <sys/proc.h> 55#define _KERNEL 56#include <sys/file.h> 57#undef _KERNEL 58#include <sys/stat.h> 59#include <sys/ioctl.h> 60#include <nlist.h> 61#include <kvm.h> 62 63#include <vm/vm.h> 64#include <vm/vm_param.h> 65#include <vm/swap_pager.h> 66 67#include <sys/sysctl.h> 68 69#include <limits.h> 70#include <ndbm.h> 71#include <paths.h> 72 73#include "kvm_private.h" 74 75#define KREAD(kd, addr, obj) \ 76 (kvm_read(kd, addr, obj, sizeof(*obj)) != sizeof(*obj)) 77 78/* 79 * Get file structures. 80 */ 81static int 82kvm_deadfiles(kd, op, arg, filehead_o, nfiles) 83 kvm_t *kd; 84 int op, arg, nfiles; 85 long filehead_o; 86{ 87 int buflen = kd->arglen, n = 0; 88 struct file *fp; 89 register char *where = kd->argspc; 90 struct filelist filehead; 91 92 /* 93 * first copyout filehead 94 */ 95 if (buflen > sizeof (filehead)) { 96 if (KREAD(kd, filehead_o, &filehead)) { 97 _kvm_err(kd, kd->program, "can't read filehead"); 98 return (0); 99 } 100 buflen -= sizeof (filehead); 101 where += sizeof (filehead); 102 *(struct filelist *)kd->argspc = filehead; 103 } 104 /* 105 * followed by an array of file structures 106 */ 107 LIST_FOREACH(fp, &filehead, f_list) { 108 if (buflen > sizeof (struct file)) { 109 if (KREAD(kd, (long)fp, ((struct file *)where))) { 110 _kvm_err(kd, kd->program, "can't read kfp"); 111 return (0); 112 } 113 buflen -= sizeof (struct file); 114 fp = (struct file *)where; 115 where += sizeof (struct file); 116 n++; 117 } 118 } 119 if (n != nfiles) { 120 _kvm_err(kd, kd->program, "inconsistant nfiles"); 121 return (0); 122 } 123 return (nfiles); 124} 125 126char * 127kvm_getfiles(kd, op, arg, cnt) 128 kvm_t *kd; 129 int op, arg; 130 int *cnt; 131{ 132 int mib[2], st, nfiles; 133 size_t size; 134 struct file *fp, *fplim; 135 struct filelist filehead; 136 137 if (ISALIVE(kd)) { 138 size = 0; 139 mib[0] = CTL_KERN; 140 mib[1] = KERN_FILE; 141 st = sysctl(mib, 2, NULL, &size, NULL, 0); 142 if (st == -1) { 143 _kvm_syserr(kd, kd->program, "kvm_getfiles"); 144 return (0); 145 } 146 if (kd->argspc == 0) 147 kd->argspc = (char *)_kvm_malloc(kd, size); 148 else if (kd->arglen < size) 149 kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size); 150 if (kd->argspc == 0) 151 return (0); 152 kd->arglen = size; 153 st = sysctl(mib, 2, kd->argspc, &size, NULL, 0); 154 if (st == -1 || size < sizeof(filehead)) { 155 _kvm_syserr(kd, kd->program, "kvm_getfiles"); 156 return (0); 157 } 158 filehead = *(struct filelist *)kd->argspc; 159 fp = (struct file *)(kd->argspc + sizeof (filehead)); 160 fplim = (struct file *)(kd->argspc + size); 161 for (nfiles = 0; LIST_FIRST(&filehead) && (fp < fplim); nfiles++, fp++) 162 LIST_FIRST(&filehead) = LIST_NEXT(fp, f_list); 163 } else { 164 struct nlist nl[3], *p; 165 166 nl[0].n_name = "_filehead"; 167 nl[1].n_name = "_nfiles"; 168 nl[2].n_name = 0; 169 170 if (kvm_nlist(kd, nl) != 0) { 171 for (p = nl; p->n_type != 0; ++p) 172 ; 173 _kvm_err(kd, kd->program, 174 "%s: no such symbol", p->n_name); 175 return (0); 176 } 177 if (KREAD(kd, nl[0].n_value, &nfiles)) { 178 _kvm_err(kd, kd->program, "can't read nfiles"); 179 return (0); 180 } 181 size = sizeof(filehead) + (nfiles + 10) * sizeof(struct file); 182 if (kd->argspc == 0) 183 kd->argspc = (char *)_kvm_malloc(kd, size); 184 else if (kd->arglen < size) 185 kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size); 186 if (kd->argspc == 0) 187 return (0); 188 kd->arglen = size; 189 nfiles = kvm_deadfiles(kd, op, arg, nl[1].n_value, nfiles); 190 if (nfiles == 0) 191 return (0); 192 } 193 *cnt = nfiles; 194 return (kd->argspc); 195} 196