kvm_file.c revision 1.24
1 /* $NetBSD: kvm_file.c,v 1.24 2006/02/16 20:48:42 christos 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 #if 0 35 static char sccsid[] = "@(#)kvm_file.c 8.1 (Berkeley) 6/4/93"; 36 #else 37 __RCSID("$NetBSD: kvm_file.c,v 1.24 2006/02/16 20:48:42 christos Exp $"); 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 /* 42 * File list interface for kvm. pstat, fstat and netstat are 43 * users of this code, so we've factored it out into a separate module. 44 * Thus, we keep this grunge out of the other kvm applications (i.e., 45 * most other applications are interested only in open/close/read/nlist). 46 */ 47 48 #include <sys/param.h> 49 #include <sys/user.h> 50 #include <sys/lwp.h> 51 #include <sys/proc.h> 52 #include <sys/exec.h> 53 #define _KERNEL 54 #include <sys/file.h> 55 #undef _KERNEL 56 #include <sys/stat.h> 57 #include <sys/ioctl.h> 58 #include <sys/tty.h> 59 #include <nlist.h> 60 #include <kvm.h> 61 62 #include <uvm/uvm_extern.h> 63 64 #include <sys/sysctl.h> 65 66 #include <limits.h> 67 #include <ndbm.h> 68 #include <paths.h> 69 #include <string.h> 70 71 #include "kvm_private.h" 72 73 #define KREAD(kd, addr, obj) \ 74 (kvm_read(kd, (u_long) addr, obj, sizeof(*obj)) != sizeof(*obj)) 75 76 static int 77 kvm_deadfiles __P((kvm_t *, int, int, long, int)); 78 79 /* 80 * Get file structures. 81 */ 82 /*ARGSUSED*/ 83 static int 84 kvm_deadfiles(kd, op, arg, ofhead, numfiles) 85 kvm_t *kd; 86 int op, arg, numfiles; 87 long ofhead; 88 { 89 size_t buflen = kd->argspc_len, n = 0; 90 struct file *fp; 91 struct filelist fhead; 92 char *where = kd->argspc; 93 94 /* 95 * first copyout filehead 96 */ 97 if (buflen < sizeof(fhead) || 98 KREAD(kd, ofhead, &fhead)) { 99 _kvm_err(kd, kd->program, "can't read filehead"); 100 return (0); 101 } 102 buflen -= sizeof(fhead); 103 where += sizeof(fhead); 104 (void)memcpy(kd->argspc, &fhead, sizeof(fhead)); 105 106 /* 107 * followed by an array of file structures 108 */ 109 for (fp = fhead.lh_first; fp != 0; fp = fp->f_list.le_next) { 110 if (buflen > sizeof(struct file)) { 111 if (KREAD(kd, (long)fp, ((struct file *)(void *)where))) { 112 _kvm_err(kd, kd->program, "can't read kfp"); 113 return (0); 114 } 115 buflen -= sizeof(struct file); 116 fp = (struct file *)(void *)where; 117 where += sizeof(struct file); 118 n++; 119 } 120 } 121 if (n != numfiles) { 122 _kvm_err(kd, kd->program, "inconsistent nfiles"); 123 return (0); 124 } 125 return (numfiles); 126 } 127 128 char * 129 kvm_getfiles(kd, op, arg, cnt) 130 kvm_t *kd; 131 int op, arg; 132 int *cnt; 133 { 134 size_t size; 135 int mib[2], st; 136 int numfiles; 137 struct file *fp, *fplim; 138 struct filelist fhead; 139 140 if (ISSYSCTL(kd)) { 141 size = 0; 142 mib[0] = CTL_KERN; 143 mib[1] = KERN_FILE; 144 st = sysctl(mib, 2, NULL, &size, NULL, 0); 145 if (st == -1) { 146 _kvm_syserr(kd, kd->program, "kvm_getprocs"); 147 return (0); 148 } 149 KVM_ALLOC(kd, argspc, size); 150 st = sysctl(mib, 2, kd->argspc, &size, NULL, 0); 151 if (st == -1 || size < sizeof(fhead)) { 152 _kvm_syserr(kd, kd->program, "kvm_getfiles"); 153 return (0); 154 } 155 (void)memcpy(&fhead, kd->argspc, sizeof(fhead)); 156 fp = (struct file *)(void *)(kd->argspc + sizeof(fhead)); 157 fplim = (struct file *)(void *)(kd->argspc + size); 158 for (numfiles = 0; fhead.lh_first && (fp < fplim); 159 numfiles++, fp++) 160 fhead.lh_first = fp->f_list.le_next; 161 } else { 162 struct nlist nl[3], *p; 163 164 nl[0].n_name = "_nfiles"; 165 nl[1].n_name = "_filehead"; 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, &numfiles)) { 176 _kvm_err(kd, kd->program, "can't read numfiles"); 177 return (0); 178 } 179 size = sizeof(fhead) + (numfiles + 10) * sizeof(struct file); 180 KVM_ALLOC(kd, argspc, size); 181 numfiles = kvm_deadfiles(kd, op, arg, (long)nl[1].n_value, 182 numfiles); 183 if (numfiles == 0) 184 return (0); 185 } 186 *cnt = numfiles; 187 return (kd->argspc); 188 } 189
Indexes created Mon Sep 29 03:10:08 GMT 2025