kvm_file.c revision 3101
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) 35static char sccsid[] = "@(#)kvm_file.c 8.1 (Berkeley) 6/4/93"; 36#endif /* LIBC_SCCS and not lint */ 37 38/* 39 * File list interface for kvm. pstat, fstat and netstat are 40 * users of this code, so we've factored it out into a separate module. 41 * Thus, we keep this grunge out of the other kvm applications (i.e., 42 * most other applications are interested only in open/close/read/nlist). 43 */ 44 45#include <sys/param.h> 46#include <sys/user.h> 47#include <sys/proc.h> 48#define KERNEL 49#include <sys/file.h> 50#undef KERNEL 51#include <sys/stat.h> 52#include <sys/ioctl.h> 53#include <sys/tty.h> 54#include <nlist.h> 55#include <kvm.h> 56 57#include <vm/vm.h> 58#include <vm/vm_param.h> 59#include <vm/swap_pager.h> 60 61#include <sys/sysctl.h> 62 63#include <limits.h> 64#include <ndbm.h> 65#include <paths.h> 66 67#include "kvm_private.h" 68 69#define KREAD(kd, addr, obj) \ 70 (kvm_read(kd, addr, obj, sizeof(*obj)) != sizeof(*obj)) 71 72/* 73 * Get file structures. 74 */ 75static 76kvm_deadfiles(kd, op, arg, filehead_o, nfiles) 77 kvm_t *kd; 78 int op, arg, nfiles; 79 long filehead_o; 80{ 81 int buflen = kd->arglen, needed = buflen, error, n = 0; 82 struct file *fp, file, *filehead; 83 register char *where = kd->argspc; 84 char *start = where; 85 86 /* 87 * first copyout filehead 88 */ 89 if (buflen > sizeof (filehead)) { 90 if (KREAD(kd, filehead_o, &filehead)) { 91 _kvm_err(kd, kd->program, "can't read filehead"); 92 return (0); 93 } 94 buflen -= sizeof (filehead); 95 where += sizeof (filehead); 96 *(struct file **)kd->argspc = filehead; 97 } 98 /* 99 * followed by an array of file structures 100 */ 101 for (fp = filehead; fp != NULL; fp = fp->f_filef) { 102 if (buflen > sizeof (struct file)) { 103 if (KREAD(kd, (long)fp, ((struct file *)where))) { 104 _kvm_err(kd, kd->program, "can't read kfp"); 105 return (0); 106 } 107 buflen -= sizeof (struct file); 108 fp = (struct file *)where; 109 where += sizeof (struct file); 110 n++; 111 } 112 } 113 if (n != nfiles) { 114 _kvm_err(kd, kd->program, "inconsistant nfiles"); 115 return (0); 116 } 117 return (nfiles); 118} 119 120char * 121kvm_getfiles(kd, op, arg, cnt) 122 kvm_t *kd; 123 int op, arg; 124 int *cnt; 125{ 126 int mib[2], size, st, nfiles; 127 struct file *filehead, *fp, *fplim; 128 129 if (ISALIVE(kd)) { 130 size = 0; 131 mib[0] = CTL_KERN; 132 mib[1] = KERN_FILE; 133 st = sysctl(mib, 2, NULL, &size, NULL, 0); 134 if (st == -1) { 135 _kvm_syserr(kd, kd->program, "kvm_getprocs"); 136 return (0); 137 } 138 if (kd->argspc == 0) 139 kd->argspc = (char *)_kvm_malloc(kd, size); 140 else if (kd->arglen < size) 141 kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size); 142 if (kd->argspc == 0) 143 return (0); 144 kd->arglen = size; 145 st = sysctl(mib, 2, kd->argspc, &size, NULL, 0); 146 if (st == -1 || size < sizeof(filehead)) { 147 _kvm_syserr(kd, kd->program, "kvm_getfiles"); 148 return (0); 149 } 150 filehead = *(struct file **)kd->argspc; 151 fp = (struct file *)(kd->argspc + sizeof (filehead)); 152 fplim = (struct file *)(kd->argspc + size); 153 for (nfiles = 0; filehead && (fp < fplim); nfiles++, fp++) 154 filehead = fp->f_filef; 155 } else { 156 struct nlist nl[3], *p; 157 158 nl[0].n_name = "_filehead"; 159 nl[1].n_name = "_nfiles"; 160 nl[2].n_name = 0; 161 162 if (kvm_nlist(kd, nl) != 0) { 163 for (p = nl; p->n_type != 0; ++p) 164 ; 165 _kvm_err(kd, kd->program, 166 "%s: no such symbol", p->n_name); 167 return (0); 168 } 169 if (KREAD(kd, nl[0].n_value, &nfiles)) { 170 _kvm_err(kd, kd->program, "can't read nfiles"); 171 return (0); 172 } 173 size = sizeof(filehead) + (nfiles + 10) * sizeof(struct file); 174 if (kd->argspc == 0) 175 kd->argspc = (char *)_kvm_malloc(kd, size); 176 else if (kd->arglen < size) 177 kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size); 178 if (kd->argspc == 0) 179 return (0); 180 kd->arglen = size; 181 nfiles = kvm_deadfiles(kd, op, arg, nl[1].n_value, nfiles); 182 if (nfiles == 0) 183 return (0); 184 } 185 *cnt = nfiles; 186 return (kd->argspc); 187} 188