1 /* $NetBSD: kvm_file.c,v 1.11 1998/09/29 02:19:02 thorpej 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 1.11 1998/09/29 02:19:02 thorpej 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 #include <string.h> 75 76 #include "kvm_private.h" 77 78 #define KREAD(kd, addr, obj) \ 79 (kvm_read(kd, (u_long) addr, obj, sizeof(*obj)) != sizeof(*obj)) 80 81 static int 82 kvm_deadfiles __P((kvm_t *, int, int, long, int)); 83 84 /* 85 * Get file structures. 86 */ 87 /*ARGSUSED*/ 88 static int 89 kvm_deadfiles(kd, op, arg, ofhead, nfiles) 90 kvm_t *kd; 91 int op, arg, nfiles; 92 long ofhead; 93 { 94 int buflen = kd->arglen, n = 0; 95 struct file *fp; 96 struct filelist fhead; 97 char *where = kd->argspc; 98 99 /* 100 * first copyout filehead 101 */ 102 if (buflen > sizeof(fhead)) { 103 if (KREAD(kd, ofhead, &fhead)) { 104 _kvm_err(kd, kd->program, "can't read filehead"); 105 return (0); 106 } 107 buflen -= sizeof(fhead); 108 where -= sizeof(fhead); 109 (void)memcpy(kd->argspc, &fhead, sizeof(fhead)); 110 } 111 /* 112 * followed by an array of file structures 113 */ 114 for (fp = fhead.lh_first; fp != 0; fp = fp->f_list.le_next) { 115 if (buflen > sizeof(struct file)) { 116 if (KREAD(kd, (long)fp, ((struct file *)(void *)where))) { 117 _kvm_err(kd, kd->program, "can't read kfp"); 118 return (0); 119 } 120 buflen -= sizeof(struct file); 121 fp = (struct file *)(void *)where; 122 where -= sizeof(struct file); 123 n++; 124 } 125 } 126 if (n != nfiles) { 127 _kvm_err(kd, kd->program, "inconsistent nfiles"); 128 return (0); 129 } 130 return (nfiles); 131 } 132 133 char * 134 kvm_getfiles(kd, op, arg, cnt) 135 kvm_t *kd; 136 int op, arg; 137 int *cnt; 138 { 139 size_t size; 140 int mib[2], st; 141 int numfiles; 142 struct file *fp, *fplim; 143 struct filelist fhead; 144 145 if (ISALIVE(kd)) { 146 size = 0; 147 mib[0] = CTL_KERN; 148 mib[1] = KERN_FILE; 149 st = sysctl(mib, 2, NULL, &size, NULL, 0); 150 if (st == -1) { 151 _kvm_syserr(kd, kd->program, "kvm_getprocs"); 152 return (0); 153 } 154 if (kd->argspc == 0) 155 kd->argspc = (char *)_kvm_malloc(kd, size); 156 else if (kd->arglen < size) 157 kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size); 158 if (kd->argspc == 0) 159 return (0); 160 kd->arglen = size; 161 st = sysctl(mib, 2, kd->argspc, &size, NULL, 0); 162 if (st == -1 || size < sizeof(fhead)) { 163 _kvm_syserr(kd, kd->program, "kvm_getfiles"); 164 return (0); 165 } 166 (void)memcpy(&fhead, kd->argspc, sizeof(fhead)); 167 fp = (struct file *)(void *)(kd->argspc + sizeof(fhead)); 168 fplim = (struct file *)(void *)(kd->argspc + size); 169 for (numfiles = 0; fhead.lh_first && (fp < fplim); 170 numfiles++, fp++) 171 fhead.lh_first = fp->f_list.le_next; 172 } else { 173 struct nlist nl[3], *p; 174 175 nl[0].n_name = "_filehead"; 176 nl[1].n_name = "_numfiles"; 177 nl[2].n_name = 0; 178 179 if (kvm_nlist(kd, nl) != 0) { 180 for (p = nl; p->n_type != 0; ++p) 181 ; 182 _kvm_err(kd, kd->program, 183 "%s: no such symbol", p->n_name); 184 return (0); 185 } 186 if (KREAD(kd, nl[0].n_value, &numfiles)) { 187 _kvm_err(kd, kd->program, "can't read numfiles"); 188 return (0); 189 } 190 size = sizeof(fhead) + (numfiles + 10) * sizeof(struct file); 191 if (kd->argspc == 0) 192 kd->argspc = (char *)_kvm_malloc(kd, size); 193 else if (kd->arglen < size) 194 kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size); 195 if (kd->argspc == 0) 196 return (0); 197 kd->arglen = size; 198 numfiles = kvm_deadfiles(kd, op, arg, (long)nl[1].n_value, 199 numfiles); 200 if (numfiles == 0) 201 return (0); 202 } 203 *cnt = numfiles; 204 return (kd->argspc); 205 } 206