kvm_file.c revision 1.28
1 /* $NetBSD: kvm_file.c,v 1.28 2010/09/26 22:28:05 jym 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 1.28 2010/09/26 22:28:05 jym 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/user.h> 53 #include <sys/lwp.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 <nlist.h> 62 #include <kvm.h> 63 64 #include <uvm/uvm_extern.h> 65 66 #include <sys/sysctl.h> 67 68 #include <limits.h> 69 #include <ndbm.h> 70 #include <paths.h> 71 #include <string.h> 72 73 #include "kvm_private.h" 74 75 static int 76 kvm_deadfiles(kvm_t *, int, int, long, int); 77 78 /* 79 * Get file structures. 80 */ 81 /*ARGSUSED*/ 82 static int 83 kvm_deadfiles(kvm_t *kd, int op, int arg, long ofhead, int numfiles) 84 { 85 size_t buflen = kd->argspc_len, n = 0; 86 struct file *fp; 87 struct filelist fhead; 88 char *where = kd->argspc; 89 90 /* 91 * first copyout filehead 92 */ 93 if (buflen < sizeof(fhead) || 94 KREAD(kd, (u_long)ofhead, &fhead)) { 95 _kvm_err(kd, kd->program, "can't read filehead"); 96 return (0); 97 } 98 buflen -= sizeof(fhead); 99 where += sizeof(fhead); 100 (void)memcpy(kd->argspc, &fhead, sizeof(fhead)); 101 102 /* 103 * followed by an array of file structures 104 */ 105 for (fp = fhead.lh_first; fp != 0; fp = fp->f_list.le_next) { 106 if (buflen > sizeof(struct file)) { 107 if (KREAD(kd, (u_long)fp, 108 ((struct file *)(void *)where))) { 109 _kvm_err(kd, kd->program, "can't read kfp"); 110 return (0); 111 } 112 buflen -= sizeof(struct file); 113 fp = (struct file *)(void *)where; 114 where += sizeof(struct file); 115 n++; 116 } 117 } 118 if (n != numfiles) { 119 _kvm_err(kd, kd->program, "inconsistent nfiles"); 120 return (0); 121 } 122 return (numfiles); 123 } 124 125 char * 126 kvm_getfiles(kvm_t *kd, int op, int arg, int *cnt) 127 { 128 size_t size; 129 int mib[2], st; 130 int numfiles; 131 struct file *fp, *fplim; 132 struct filelist fhead; 133 134 if (ISSYSCTL(kd)) { 135 size = 0; 136 mib[0] = CTL_KERN; 137 mib[1] = KERN_FILE; 138 st = sysctl(mib, 2, NULL, &size, NULL, 0); 139 if (st == -1) { 140 _kvm_syserr(kd, kd->program, "kvm_getprocs"); 141 return (0); 142 } 143 KVM_ALLOC(kd, argspc, size); 144 st = sysctl(mib, 2, kd->argspc, &size, NULL, 0); 145 if (st == -1 || size < sizeof(fhead)) { 146 _kvm_syserr(kd, kd->program, "kvm_getfiles"); 147 return (0); 148 } 149 (void)memcpy(&fhead, kd->argspc, sizeof(fhead)); 150 fp = (struct file *)(void *)(kd->argspc + sizeof(fhead)); 151 fplim = (struct file *)(void *)(kd->argspc + size); 152 for (numfiles = 0; fhead.lh_first && (fp < fplim); 153 numfiles++, fp++) 154 fhead.lh_first = fp->f_list.le_next; 155 } else { 156 struct nlist nl[3], *p; 157 158 nl[0].n_name = "_nfiles"; 159 nl[1].n_name = "_filehead"; 160 nl[2].n_name = 0; 161 162 if (kvm_nlist(kd, nl) != 0) { 163 for (p = nl; p->n_type != 0; ++p) 164 ; 165 _kvm_err(kd, kd->program, 166 "%s: no such symbol", p->n_name); 167 return (0); 168 } 169 if (KREAD(kd, nl[0].n_value, &numfiles)) { 170 _kvm_err(kd, kd->program, "can't read numfiles"); 171 return (0); 172 } 173 size = sizeof(fhead) + (numfiles + 10) * sizeof(struct file); 174 KVM_ALLOC(kd, argspc, size); 175 numfiles = kvm_deadfiles(kd, op, arg, (long)nl[1].n_value, 176 numfiles); 177 if (numfiles == 0) 178 return (0); 179 } 180 *cnt = numfiles; 181 return (kd->argspc); 182 } 183
Indexes created Fri Sep 26 08:10:20 GMT 2025