kvm_file.c revision 38534
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 <nlist.h> 54#include <kvm.h> 55 56#include <vm/vm.h> 57#include <vm/vm_param.h> 58#include <vm/swap_pager.h> 59 60#include <sys/sysctl.h> 61 62#include <limits.h> 63#include <ndbm.h> 64#include <paths.h> 65 66#include "kvm_private.h" 67 68#define KREAD(kd, addr, obj) \ 69 (kvm_read(kd, addr, obj, sizeof(*obj)) != sizeof(*obj)) 70 71/* 72 * Get file structures. 73 */ 74static int 75kvm_deadfiles(kd, op, arg, filehead_o, nfiles) 76 kvm_t *kd; 77 int op, arg, nfiles; 78 long filehead_o; 79{ 80 int buflen = kd->arglen, n = 0; 81 struct file *fp; 82 register char *where = kd->argspc; 83 struct filelist filehead; 84 85 /* 86 * first copyout filehead 87 */ 88 if (buflen > sizeof (filehead)) { 89 if (KREAD(kd, filehead_o, &filehead)) { 90 _kvm_err(kd, kd->program, "can't read filehead"); 91 return (0); 92 } 93 buflen -= sizeof (filehead); 94 where += sizeof (filehead); 95 *(struct filelist *)kd->argspc = filehead; 96 } 97 /* 98 * followed by an array of file structures 99 */ 100 for (fp = filehead.lh_first; fp != 0; fp = fp->f_list.le_next) { 101 if (buflen > sizeof (struct file)) { 102 if (KREAD(kd, (long)fp, ((struct file *)where))) { 103 _kvm_err(kd, kd->program, "can't read kfp"); 104 return (0); 105 } 106 buflen -= sizeof (struct file); 107 fp = (struct file *)where; 108 where += sizeof (struct file); 109 n++; 110 } 111 } 112 if (n != nfiles) { 113 _kvm_err(kd, kd->program, "inconsistant nfiles"); 114 return (0); 115 } 116 return (nfiles); 117} 118 119char * 120kvm_getfiles(kd, op, arg, cnt) 121 kvm_t *kd; 122 int op, arg; 123 int *cnt; 124{ 125 int mib[2], st, nfiles; 126 size_t size; 127 struct file *fp, *fplim; 128 struct filelist filehead; 129 130 if (ISALIVE(kd)) { 131 size = 0; 132 mib[0] = CTL_KERN; 133 mib[1] = KERN_FILE; 134 st = sysctl(mib, 2, NULL, &size, NULL, 0); 135 if (st == -1) { 136 _kvm_syserr(kd, kd->program, "kvm_getprocs"); 137 return (0); 138 } 139 if (kd->argspc == 0) 140 kd->argspc = (char *)_kvm_malloc(kd, size); 141 else if (kd->arglen < size) 142 kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size); 143 if (kd->argspc == 0) 144 return (0); 145 kd->arglen = size; 146 st = sysctl(mib, 2, kd->argspc, &size, NULL, 0); 147 if (st == -1 || size < sizeof(filehead)) { 148 _kvm_syserr(kd, kd->program, "kvm_getfiles"); 149 return (0); 150 } 151 filehead = *(struct filelist *)kd->argspc; 152 fp = (struct file *)(kd->argspc + sizeof (filehead)); 153 fplim = (struct file *)(kd->argspc + size); 154 for (nfiles = 0; filehead.lh_first && (fp < fplim); nfiles++, fp++) 155 filehead.lh_first = fp->f_list.le_next; 156 } else { 157 struct nlist nl[3], *p; 158 159 nl[0].n_name = "_filehead"; 160 nl[1].n_name = "_nfiles"; 161 nl[2].n_name = 0; 162 163 if (kvm_nlist(kd, nl) != 0) { 164 for (p = nl; p->n_type != 0; ++p) 165 ; 166 _kvm_err(kd, kd->program, 167 "%s: no such symbol", p->n_name); 168 return (0); 169 } 170 if (KREAD(kd, nl[0].n_value, &nfiles)) { 171 _kvm_err(kd, kd->program, "can't read nfiles"); 172 return (0); 173 } 174 size = sizeof(filehead) + (nfiles + 10) * sizeof(struct file); 175 if (kd->argspc == 0) 176 kd->argspc = (char *)_kvm_malloc(kd, size); 177 else if (kd->arglen < size) 178 kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size); 179 if (kd->argspc == 0) 180 return (0); 181 kd->arglen = size; 182 nfiles = kvm_deadfiles(kd, op, arg, nl[1].n_value, nfiles); 183 if (nfiles == 0) 184 return (0); 185 } 186 *cnt = nfiles; 187 return (kd->argspc); 188} 189