/* $NetBSD: kvm_file.c,v 1.29 2014/02/19 20:21:22 dsl Exp $ */
/*-
* Copyright (c) 1989, 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)kvm_file.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: kvm_file.c,v 1.29 2014/02/19 20:21:22 dsl Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
/*
* File list interface for kvm. pstat, fstat and netstat are
* users of this code, so we've factored it out into a separate module.
* Thus, we keep this grunge out of the other kvm applications (i.e.,
* most other applications are interested only in open/close/read/nlist).
*/
#define _KERNEL
#include <sys/types.h>
#undef _KERNEL
#include <sys/param.h>
#include <sys/lwp.h>
#include <sys/proc.h>
#include <sys/exec.h>
#define _KERNEL
#include <sys/file.h>
#undef _KERNEL
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <nlist.h>
#include <kvm.h>
#include <uvm/uvm_extern.h>
#include <sys/sysctl.h>
#include <limits.h>
#include <ndbm.h>
#include <paths.h>
#include <string.h>
#include "kvm_private.h"
static int
kvm_deadfiles(kvm_t *, int, int, long, int);
/*
* Get file structures.
*/
/*ARGSUSED*/
static int
kvm_deadfiles(kvm_t *kd, int op, int arg, long ofhead, int numfiles)
{
size_t buflen = kd->argspc_len, n = 0;
struct file *fp;
struct filelist fhead;
char *where = kd->argspc;
/*
* first copyout filehead
*/
if (buflen < sizeof(fhead) ||
KREAD(kd, (u_long)ofhead, &fhead)) {
_kvm_err(kd, kd->program, "can't read filehead");
return (0);
}
buflen -= sizeof(fhead);
where += sizeof(fhead);
(void)memcpy(kd->argspc, &fhead, sizeof(fhead));
/*
* followed by an array of file structures
*/
for (fp = fhead.lh_first; fp != 0; fp = fp->f_list.le_next) {
if (buflen > sizeof(struct file)) {
if (KREAD(kd, (u_long)fp,
((struct file *)(void *)where))) {
_kvm_err(kd, kd->program, "can't read kfp");
return (0);
}
buflen -= sizeof(struct file);
fp = (struct file *)(void *)where;
where += sizeof(struct file);
n++;
}
}
if (n != numfiles) {
_kvm_err(kd, kd->program, "inconsistent nfiles");
return (0);
}
return (numfiles);
}
char *
kvm_getfiles(kvm_t *kd, int op, int arg, int *cnt)
{
size_t size;
int mib[2], st;
int numfiles;
struct file *fp, *fplim;
struct filelist fhead;
if (ISSYSCTL(kd)) {
size = 0;
mib[0] = CTL_KERN;
mib[1] = KERN_FILE;
st = sysctl(mib, 2, NULL, &size, NULL, 0);
if (st == -1) {
_kvm_syserr(kd, kd->program, "kvm_getprocs");
return (0);
}
KVM_ALLOC(kd, argspc, size);
st = sysctl(mib, 2, kd->argspc, &size, NULL, 0);
if (st == -1 || size < sizeof(fhead)) {
_kvm_syserr(kd, kd->program, "kvm_getfiles");
return (0);
}
(void)memcpy(&fhead, kd->argspc, sizeof(fhead));
fp = (struct file *)(void *)(kd->argspc + sizeof(fhead));
fplim = (struct file *)(void *)(kd->argspc + size);
for (numfiles = 0; fhead.lh_first && (fp < fplim);
numfiles++, fp++)
fhead.lh_first = fp->f_list.le_next;
} else {
struct nlist nl[3], *p;
nl[0].n_name = "_nfiles";
nl[1].n_name = "_filehead";
nl[2].n_name = 0;
if (kvm_nlist(kd, nl) != 0) {
for (p = nl; p->n_type != 0; ++p)
;
_kvm_err(kd, kd->program,
"%s: no such symbol", p->n_name);
return (0);
}
if (KREAD(kd, nl[0].n_value, &numfiles)) {
_kvm_err(kd, kd->program, "can't read numfiles");
return (0);
}
size = sizeof(fhead) + (numfiles + 10) * sizeof(struct file);
KVM_ALLOC(kd, argspc, size);
numfiles = kvm_deadfiles(kd, op, arg, (long)nl[1].n_value,
numfiles);
if (numfiles == 0)
return (0);
}
*cnt = numfiles;
return (kd->argspc);
}
