1 /* $NetBSD: kvm_file.c,v 1.8 1997/08/15 17:52:45 drochner Exp $ */ 2 3 /*- 4 * Copyright (c) 1989, 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)kvm_file.c 8.1 (Berkeley) 6/4/93"; 40 #else 41 __RCSID("$NetBSD: kvm_file.c,v 1.8 1997/08/15 17:52:45 drochner Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 /* 46 * File list interface for kvm. pstat, fstat and netstat are 47 * users of this code, so we've factored it out into a separate module. 48 * Thus, we keep this grunge out of the other kvm applications (i.e., 49 * most other applications are interested only in open/close/read/nlist). 50 */ 51 52 #include <sys/param.h> 53 #include <sys/user.h> 54 #include <sys/proc.h> 55 #include <sys/exec.h> 56 #define _KERNEL 57 #include <sys/file.h> 58 #undef _KERNEL 59 #include <sys/stat.h> 60 #include <sys/ioctl.h> 61 #include <sys/tty.h> 62 #include <nlist.h> 63 #include <kvm.h> 64 65 #include <vm/vm.h> 66 #include <vm/vm_param.h> 67 #include <vm/swap_pager.h> 68 69 #include <sys/sysctl.h> 70 71 #include <limits.h> 72 #include <ndbm.h> 73 #include <paths.h> 74 75 #include "kvm_private.h" 76 77 #define KREAD(kd, addr, obj) \ 78 (kvm_read(kd, addr, obj, sizeof(*obj)) != sizeof(*obj)) 79 80 static int 81 kvm_deadfiles __P((kvm_t *, int, int, long, int)); 82 83 /* 84 * Get file structures. 85 */ 86 static int 87 kvm_deadfiles(kd, op, arg, filehead_o, nfiles) 88 kvm_t *kd; 89 int op, arg, nfiles; 90 long filehead_o; 91 { 92 int buflen = kd->arglen, n = 0; 93 struct file *fp; 94 struct filelist filehead; 95 register char *where = kd->argspc; 96 97 /* 98 * first copyout filehead 99 */ 100 if (buflen > sizeof (filehead)) { 101 if (KREAD(kd, filehead_o, &filehead)) { 102 _kvm_err(kd, kd->program, "can't read filehead"); 103 return (0); 104 } 105 buflen -= sizeof (filehead); 106 where += sizeof (filehead); 107 *(struct filelist *)kd->argspc = filehead; 108 } 109 /* 110 * followed by an array of file structures 111 */ 112 for (fp = filehead.lh_first; fp != 0; fp = fp->f_list.le_next) { 113 if (buflen > sizeof (struct file)) { 114 if (KREAD(kd, (long)fp, ((struct file *)where))) { 115 _kvm_err(kd, kd->program, "can't read kfp"); 116 return (0); 117 } 118 buflen -= sizeof (struct file); 119 fp = (struct file *)where; 120 where += sizeof (struct file); 121 n++; 122 } 123 } 124 if (n != nfiles) { 125 _kvm_err(kd, kd->program, "inconsistent nfiles"); 126 return (0); 127 } 128 return (nfiles); 129 } 130 131 char * 132 kvm_getfiles(kd, op, arg, cnt) 133 kvm_t *kd; 134 int op, arg; 135 int *cnt; 136 { 137 size_t size; 138 int mib[2], st, nfiles; 139 struct file *fp, *fplim; 140 struct filelist filehead; 141 142 if (ISALIVE(kd)) { 143 size = 0; 144 mib[0] = CTL_KERN; 145 mib[1] = KERN_FILE; 146 st = sysctl(mib, 2, NULL, &size, NULL, 0); 147 if (st == -1) { 148 _kvm_syserr(kd, kd->program, "kvm_getprocs"); 149 return (0); 150 } 151 if (kd->argspc == 0) 152 kd->argspc = (char *)_kvm_malloc(kd, size); 153 else if (kd->arglen < size) 154 kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size); 155 if (kd->argspc == 0) 156 return (0); 157 kd->arglen = size; 158 st = sysctl(mib, 2, kd->argspc, &size, NULL, 0); 159 if (st == -1 || size < sizeof(filehead)) { 160 _kvm_syserr(kd, kd->program, "kvm_getfiles"); 161 return (0); 162 } 163 filehead = *(struct filelist *)kd->argspc; 164 fp = (struct file *)(kd->argspc + sizeof (filehead)); 165 fplim = (struct file *)(kd->argspc + size); 166 for (nfiles = 0; filehead.lh_first && (fp < fplim); 167 nfiles++, fp++) 168 filehead.lh_first = fp->f_list.le_next; 169 } else { 170 struct nlist nl[3], *p; 171 172 nl[0].n_name = "_filehead"; 173 nl[1].n_name = "_nfiles"; 174 nl[2].n_name = 0; 175 176 if (kvm_nlist(kd, nl) != 0) { 177 for (p = nl; p->n_type != 0; ++p) 178 ; 179 _kvm_err(kd, kd->program, 180 "%s: no such symbol", p->n_name); 181 return (0); 182 } 183 if (KREAD(kd, nl[0].n_value, &nfiles)) { 184 _kvm_err(kd, kd->program, "can't read nfiles"); 185 return (0); 186 } 187 size = sizeof(filehead) + (nfiles + 10) * sizeof(struct file); 188 if (kd->argspc == 0) 189 kd->argspc = (char *)_kvm_malloc(kd, size); 190 else if (kd->arglen < size) 191 kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size); 192 if (kd->argspc == 0) 193 return (0); 194 kd->arglen = size; 195 nfiles = kvm_deadfiles(kd, op, arg, nl[1].n_value, nfiles); 196 if (nfiles == 0) 197 return (0); 198 } 199 *cnt = nfiles; 200 return (kd->argspc); 201 } 202