1 /* $NetBSD: kvm_file.c,v 1.29 2014/02/19 20:21:22 dsl 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 1.29 2014/02/19 20:21:22 dsl 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 #define _KERNEL 49 #include <sys/types.h> 50 #undef _KERNEL 51 #include <sys/param.h> 52 #include <sys/lwp.h> 53 #include <sys/proc.h> 54 #include <sys/exec.h> 55 #define _KERNEL 56 #include <sys/file.h> 57 #undef _KERNEL 58 #include <sys/stat.h> 59 #include <sys/ioctl.h> 60 #include <nlist.h> 61 #include <kvm.h> 62 63 #include <uvm/uvm_extern.h> 64 65 #include <sys/sysctl.h> 66 67 #include <limits.h> 68 #include <ndbm.h> 69 #include <paths.h> 70 #include <string.h> 71 72 #include "kvm_private.h" 73 74 static int 75 kvm_deadfiles(kvm_t *, int, int, long, int); 76 77 /* 78 * Get file structures. 79 */ 80 /*ARGSUSED*/ 81 static int 82 kvm_deadfiles(kvm_t *kd, int op, int arg, long ofhead, int numfiles) 83 { 84 size_t buflen = kd->argspc_len, n = 0; 85 struct file *fp; 86 struct filelist fhead; 87 char *where = kd->argspc; 88 89 /* 90 * first copyout filehead 91 */ 92 if (buflen < sizeof(fhead) || 93 KREAD(kd, (u_long)ofhead, &fhead)) { 94 _kvm_err(kd, kd->program, "can't read filehead"); 95 return (0); 96 } 97 buflen -= sizeof(fhead); 98 where += sizeof(fhead); 99 (void)memcpy(kd->argspc, &fhead, sizeof(fhead)); 100 101 /* 102 * followed by an array of file structures 103 */ 104 for (fp = fhead.lh_first; fp != 0; fp = fp->f_list.le_next) { 105 if (buflen > sizeof(struct file)) { 106 if (KREAD(kd, (u_long)fp, 107 ((struct file *)(void *)where))) { 108 _kvm_err(kd, kd->program, "can't read kfp"); 109 return (0); 110 } 111 buflen -= sizeof(struct file); 112 fp = (struct file *)(void *)where; 113 where += sizeof(struct file); 114 n++; 115 } 116 } 117 if (n != numfiles) { 118 _kvm_err(kd, kd->program, "inconsistent nfiles"); 119 return (0); 120 } 121 return (numfiles); 122 } 123 124 char * 125 kvm_getfiles(kvm_t *kd, int op, int arg, int *cnt) 126 { 127 size_t size; 128 int mib[2], st; 129 int numfiles; 130 struct file *fp, *fplim; 131 struct filelist fhead; 132 133 if (ISSYSCTL(kd)) { 134 size = 0; 135 mib[0] = CTL_KERN; 136 mib[1] = KERN_FILE; 137 st = sysctl(mib, 2, NULL, &size, NULL, 0); 138 if (st == -1) { 139 _kvm_syserr(kd, kd->program, "kvm_getprocs"); 140 return (0); 141 } 142 KVM_ALLOC(kd, argspc, size); 143 st = sysctl(mib, 2, kd->argspc, &size, NULL, 0); 144 if (st == -1 || size < sizeof(fhead)) { 145 _kvm_syserr(kd, kd->program, "kvm_getfiles"); 146 return (0); 147 } 148 (void)memcpy(&fhead, kd->argspc, sizeof(fhead)); 149 fp = (struct file *)(void *)(kd->argspc + sizeof(fhead)); 150 fplim = (struct file *)(void *)(kd->argspc + size); 151 for (numfiles = 0; fhead.lh_first && (fp < fplim); 152 numfiles++, fp++) 153 fhead.lh_first = fp->f_list.le_next; 154 } else { 155 struct nlist nl[3], *p; 156 157 nl[0].n_name = "_nfiles"; 158 nl[1].n_name = "_filehead"; 159 nl[2].n_name = 0; 160 161 if (kvm_nlist(kd, nl) != 0) { 162 for (p = nl; p->n_type != 0; ++p) 163 ; 164 _kvm_err(kd, kd->program, 165 "%s: no such symbol", p->n_name); 166 return (0); 167 } 168 if (KREAD(kd, nl[0].n_value, &numfiles)) { 169 _kvm_err(kd, kd->program, "can't read numfiles"); 170 return (0); 171 } 172 size = sizeof(fhead) + (numfiles + 10) * sizeof(struct file); 173 KVM_ALLOC(kd, argspc, size); 174 numfiles = kvm_deadfiles(kd, op, arg, (long)nl[1].n_value, 175 numfiles); 176 if (numfiles == 0) 177 return (0); 178 } 179 *cnt = numfiles; 180 return (kd->argspc); 181 } 182
Indexes created Sat Sep 20 22:09:52 GMT 2025