kvm_file.c revision 83551
11573Srgrimes/*- 21573Srgrimes * Copyright (c) 1989, 1992, 1993 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 51573Srgrimes * Redistribution and use in source and binary forms, with or without 61573Srgrimes * modification, are permitted provided that the following conditions 71573Srgrimes * are met: 81573Srgrimes * 1. Redistributions of source code must retain the above copyright 91573Srgrimes * notice, this list of conditions and the following disclaimer. 101573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111573Srgrimes * notice, this list of conditions and the following disclaimer in the 121573Srgrimes * documentation and/or other materials provided with the distribution. 131573Srgrimes * 3. All advertising materials mentioning features or use of this software 141573Srgrimes * must display the following acknowledgement: 151573Srgrimes * This product includes software developed by the University of 161573Srgrimes * California, Berkeley and its contributors. 171573Srgrimes * 4. Neither the name of the University nor the names of its contributors 181573Srgrimes * may be used to endorse or promote products derived from this software 191573Srgrimes * without specific prior written permission. 201573Srgrimes * 211573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311573Srgrimes * SUCH DAMAGE. 321573Srgrimes */ 331573Srgrimes 3483551Sdillon#include <sys/cdefs.h> 3583551Sdillon__FBSDID("$FreeBSD: head/lib/libkvm/kvm_file.c 83551 2001-09-16 21:35:07Z dillon $"); 3683551Sdillon 371573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 3855127Speter#if 0 391573Srgrimesstatic char sccsid[] = "@(#)kvm_file.c 8.1 (Berkeley) 6/4/93"; 4055127Speter#endif 411573Srgrimes#endif /* LIBC_SCCS and not lint */ 421573Srgrimes 431573Srgrimes/* 448870Srgrimes * File list interface for kvm. pstat, fstat and netstat are 451573Srgrimes * users of this code, so we've factored it out into a separate module. 461573Srgrimes * Thus, we keep this grunge out of the other kvm applications (i.e., 471573Srgrimes * most other applications are interested only in open/close/read/nlist). 481573Srgrimes */ 491573Srgrimes 501573Srgrimes#include <sys/param.h> 5176176Smarkm#include <sys/lock.h> 5276176Smarkm#include <sys/mutex.h> 531573Srgrimes#include <sys/user.h> 541573Srgrimes#include <sys/proc.h> 5555206Speter#define _KERNEL 561573Srgrimes#include <sys/file.h> 5755206Speter#undef _KERNEL 581573Srgrimes#include <sys/stat.h> 591573Srgrimes#include <sys/ioctl.h> 601573Srgrimes#include <nlist.h> 611573Srgrimes#include <kvm.h> 621573Srgrimes 631573Srgrimes#include <vm/vm.h> 641573Srgrimes#include <vm/vm_param.h> 651573Srgrimes#include <vm/swap_pager.h> 661573Srgrimes 671573Srgrimes#include <sys/sysctl.h> 681573Srgrimes 691573Srgrimes#include <limits.h> 701573Srgrimes#include <ndbm.h> 711573Srgrimes#include <paths.h> 721573Srgrimes 731573Srgrimes#include "kvm_private.h" 741573Srgrimes 751573Srgrimes#define KREAD(kd, addr, obj) \ 761573Srgrimes (kvm_read(kd, addr, obj, sizeof(*obj)) != sizeof(*obj)) 771573Srgrimes 781573Srgrimes/* 791573Srgrimes * Get file structures. 801573Srgrimes */ 8117141Sjkhstatic int 821573Srgrimeskvm_deadfiles(kd, op, arg, filehead_o, nfiles) 831573Srgrimes kvm_t *kd; 841573Srgrimes int op, arg, nfiles; 851573Srgrimes long filehead_o; 861573Srgrimes{ 876683Sphk int buflen = kd->arglen, n = 0; 8814523Shsu struct file *fp; 891573Srgrimes register char *where = kd->argspc; 9014523Shsu struct filelist filehead; 911573Srgrimes 921573Srgrimes /* 931573Srgrimes * first copyout filehead 941573Srgrimes */ 951573Srgrimes if (buflen > sizeof (filehead)) { 961573Srgrimes if (KREAD(kd, filehead_o, &filehead)) { 971573Srgrimes _kvm_err(kd, kd->program, "can't read filehead"); 981573Srgrimes return (0); 991573Srgrimes } 1001573Srgrimes buflen -= sizeof (filehead); 1011573Srgrimes where += sizeof (filehead); 10214523Shsu *(struct filelist *)kd->argspc = filehead; 1031573Srgrimes } 1041573Srgrimes /* 1051573Srgrimes * followed by an array of file structures 1061573Srgrimes */ 10770525Sben LIST_FOREACH(fp, &filehead, f_list) { 1081573Srgrimes if (buflen > sizeof (struct file)) { 1091573Srgrimes if (KREAD(kd, (long)fp, ((struct file *)where))) { 1101573Srgrimes _kvm_err(kd, kd->program, "can't read kfp"); 1111573Srgrimes return (0); 1121573Srgrimes } 1131573Srgrimes buflen -= sizeof (struct file); 1141573Srgrimes fp = (struct file *)where; 1151573Srgrimes where += sizeof (struct file); 1161573Srgrimes n++; 1171573Srgrimes } 1181573Srgrimes } 1191573Srgrimes if (n != nfiles) { 1201573Srgrimes _kvm_err(kd, kd->program, "inconsistant nfiles"); 1211573Srgrimes return (0); 1221573Srgrimes } 1231573Srgrimes return (nfiles); 1241573Srgrimes} 1251573Srgrimes 1261573Srgrimeschar * 1271573Srgrimeskvm_getfiles(kd, op, arg, cnt) 1281573Srgrimes kvm_t *kd; 1291573Srgrimes int op, arg; 1301573Srgrimes int *cnt; 1311573Srgrimes{ 13238534Sdfr int mib[2], st, nfiles; 13338534Sdfr size_t size; 13414523Shsu struct file *fp, *fplim; 13514523Shsu struct filelist filehead; 1361573Srgrimes 1371573Srgrimes if (ISALIVE(kd)) { 1381573Srgrimes size = 0; 1391573Srgrimes mib[0] = CTL_KERN; 1401573Srgrimes mib[1] = KERN_FILE; 1411573Srgrimes st = sysctl(mib, 2, NULL, &size, NULL, 0); 1421573Srgrimes if (st == -1) { 14357321Speter _kvm_syserr(kd, kd->program, "kvm_getfiles"); 1441573Srgrimes return (0); 1451573Srgrimes } 1461573Srgrimes if (kd->argspc == 0) 1471573Srgrimes kd->argspc = (char *)_kvm_malloc(kd, size); 1481573Srgrimes else if (kd->arglen < size) 1491573Srgrimes kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size); 1501573Srgrimes if (kd->argspc == 0) 1511573Srgrimes return (0); 1521573Srgrimes kd->arglen = size; 1531573Srgrimes st = sysctl(mib, 2, kd->argspc, &size, NULL, 0); 1541573Srgrimes if (st == -1 || size < sizeof(filehead)) { 1551573Srgrimes _kvm_syserr(kd, kd->program, "kvm_getfiles"); 1561573Srgrimes return (0); 1571573Srgrimes } 15814523Shsu filehead = *(struct filelist *)kd->argspc; 1591573Srgrimes fp = (struct file *)(kd->argspc + sizeof (filehead)); 1601573Srgrimes fplim = (struct file *)(kd->argspc + size); 16170525Sben for (nfiles = 0; LIST_FIRST(&filehead) && (fp < fplim); nfiles++, fp++) 16270525Sben LIST_FIRST(&filehead) = LIST_NEXT(fp, f_list); 1631573Srgrimes } else { 1641573Srgrimes struct nlist nl[3], *p; 1651573Srgrimes 1661573Srgrimes nl[0].n_name = "_filehead"; 1671573Srgrimes nl[1].n_name = "_nfiles"; 1681573Srgrimes nl[2].n_name = 0; 1691573Srgrimes 1701573Srgrimes if (kvm_nlist(kd, nl) != 0) { 1711573Srgrimes for (p = nl; p->n_type != 0; ++p) 1721573Srgrimes ; 1731573Srgrimes _kvm_err(kd, kd->program, 1741573Srgrimes "%s: no such symbol", p->n_name); 1751573Srgrimes return (0); 1761573Srgrimes } 1771573Srgrimes if (KREAD(kd, nl[0].n_value, &nfiles)) { 1781573Srgrimes _kvm_err(kd, kd->program, "can't read nfiles"); 1791573Srgrimes return (0); 1801573Srgrimes } 1811573Srgrimes size = sizeof(filehead) + (nfiles + 10) * sizeof(struct file); 1821573Srgrimes if (kd->argspc == 0) 1831573Srgrimes kd->argspc = (char *)_kvm_malloc(kd, size); 1841573Srgrimes else if (kd->arglen < size) 1851573Srgrimes kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size); 1861573Srgrimes if (kd->argspc == 0) 1871573Srgrimes return (0); 1881573Srgrimes kd->arglen = size; 1891573Srgrimes nfiles = kvm_deadfiles(kd, op, arg, nl[1].n_value, nfiles); 1901573Srgrimes if (nfiles == 0) 1911573Srgrimes return (0); 1921573Srgrimes } 1931573Srgrimes *cnt = nfiles; 1941573Srgrimes return (kd->argspc); 1951573Srgrimes} 196