kvm_file.c revision 55206
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 55206 1999-12-29 05:07:58Z peter $"; 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/user.h> 52#include <sys/proc.h> 53#define _KERNEL 54#include <sys/file.h> 55#undef _KERNEL 56#include <sys/stat.h> 57#include <sys/ioctl.h> 58#include <nlist.h> 59#include <kvm.h> 60 61#include <vm/vm.h> 62#include <vm/vm_param.h> 63#include <vm/swap_pager.h> 64 65#include <sys/sysctl.h> 66 67#include <limits.h> 68#include <ndbm.h> 69#include <paths.h> 70 71#include "kvm_private.h" 72 73#define KREAD(kd, addr, obj) \ 74 (kvm_read(kd, addr, obj, sizeof(*obj)) != sizeof(*obj)) 75 76/* 77 * Get file structures. 78 */ 79static int 80kvm_deadfiles(kd, op, arg, filehead_o, nfiles) 81 kvm_t *kd; 82 int op, arg, nfiles; 83 long filehead_o; 84{ 85 int buflen = kd->arglen, n = 0; 86 struct file *fp; 87 register char *where = kd->argspc; 88 struct filelist filehead; 89 90 /* 91 * first copyout filehead 92 */ 93 if (buflen > sizeof (filehead)) { 94 if (KREAD(kd, filehead_o, &filehead)) { 95 _kvm_err(kd, kd->program, "can't read filehead"); 96 return (0); 97 } 98 buflen -= sizeof (filehead); 99 where += sizeof (filehead); 100 *(struct filelist *)kd->argspc = filehead; 101 } 102 /* 103 * followed by an array of file structures 104 */ 105 for (fp = filehead.lh_first; fp != 0; fp = fp->f_list.le_next) { 106 if (buflen > sizeof (struct file)) { 107 if (KREAD(kd, (long)fp, ((struct file *)where))) { 108 _kvm_err(kd, kd->program, "can't read kfp"); 109 return (0); 110 } 111 buflen -= sizeof (struct file); 112 fp = (struct file *)where; 113 where += sizeof (struct file); 114 n++; 115 } 116 } 117 if (n != nfiles) { 118 _kvm_err(kd, kd->program, "inconsistant nfiles"); 119 return (0); 120 } 121 return (nfiles); 122} 123 124char * 125kvm_getfiles(kd, op, arg, cnt) 126 kvm_t *kd; 127 int op, arg; 128 int *cnt; 129{ 130 int mib[2], st, nfiles; 131 size_t size; 132 struct file *fp, *fplim; 133 struct filelist filehead; 134 135 if (ISALIVE(kd)) { 136 size = 0; 137 mib[0] = CTL_KERN; 138 mib[1] = KERN_FILE; 139 st = sysctl(mib, 2, NULL, &size, NULL, 0); 140 if (st == -1) { 141 _kvm_syserr(kd, kd->program, "kvm_getprocs"); 142 return (0); 143 } 144 if (kd->argspc == 0) 145 kd->argspc = (char *)_kvm_malloc(kd, size); 146 else if (kd->arglen < size) 147 kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size); 148 if (kd->argspc == 0) 149 return (0); 150 kd->arglen = size; 151 st = sysctl(mib, 2, kd->argspc, &size, NULL, 0); 152 if (st == -1 || size < sizeof(filehead)) { 153 _kvm_syserr(kd, kd->program, "kvm_getfiles"); 154 return (0); 155 } 156 filehead = *(struct filelist *)kd->argspc; 157 fp = (struct file *)(kd->argspc + sizeof (filehead)); 158 fplim = (struct file *)(kd->argspc + size); 159 for (nfiles = 0; filehead.lh_first && (fp < fplim); nfiles++, fp++) 160 filehead.lh_first = fp->f_list.le_next; 161 } else { 162 struct nlist nl[3], *p; 163 164 nl[0].n_name = "_filehead"; 165 nl[1].n_name = "_nfiles"; 166 nl[2].n_name = 0; 167 168 if (kvm_nlist(kd, nl) != 0) { 169 for (p = nl; p->n_type != 0; ++p) 170 ; 171 _kvm_err(kd, kd->program, 172 "%s: no such symbol", p->n_name); 173 return (0); 174 } 175 if (KREAD(kd, nl[0].n_value, &nfiles)) { 176 _kvm_err(kd, kd->program, "can't read nfiles"); 177 return (0); 178 } 179 size = sizeof(filehead) + (nfiles + 10) * sizeof(struct file); 180 if (kd->argspc == 0) 181 kd->argspc = (char *)_kvm_malloc(kd, size); 182 else if (kd->arglen < size) 183 kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size); 184 if (kd->argspc == 0) 185 return (0); 186 kd->arglen = size; 187 nfiles = kvm_deadfiles(kd, op, arg, nl[1].n_value, nfiles); 188 if (nfiles == 0) 189 return (0); 190 } 191 *cnt = nfiles; 192 return (kd->argspc); 193} 194