freebsd-dev/lib/libkvm/kvm_file.c

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/*-
* 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.
* 4. 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.
*/
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#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
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#if defined(LIBC_SCCS) && !defined(lint)
#if 0
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static char sccsid[] = "@(#)kvm_file.c 8.1 (Berkeley) 6/4/93";
#endif
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#endif /* LIBC_SCCS and not lint */
/*
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* File list interface for kvm. pstat, fstat and netstat are
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* 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).
*/
#include <sys/param.h>
#include <sys/user.h>
#include <sys/proc.h>
#define _WANT_FILE /* make file.h give us 'struct file' */
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#include <sys/file.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <nlist.h>
#include <kvm.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <sys/sysctl.h>
#include <limits.h>
#include <ndbm.h>
#include <paths.h>
#include <stdlib.h>
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#include "kvm_private.h"
#define KREAD(kd, addr, obj) \
(kvm_read(kd, addr, obj, sizeof(*obj)) != sizeof(*obj))
#define KREADN(kd, addr, obj, cnt) \
(kvm_read(kd, addr, obj, (cnt)) != (cnt))
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/*
* Get file structures.
*/
static int
kvm_deadfiles(kd, op, arg, allproc_o, nprocs)
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kvm_t *kd;
int op, arg, nprocs;
long allproc_o;
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{
struct proc proc;
struct filedesc filed;
int buflen = kd->arglen, ocnt = 0, n = 0, once = 0, i;
struct file **ofiles;
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struct file *fp;
struct proc *p;
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char *where = kd->argspc;
if (buflen < sizeof (struct file *) + sizeof (struct file))
return (0);
if (KREAD(kd, allproc_o, &p)) {
_kvm_err(kd, kd->program, "cannot read allproc");
return (0);
}
for (; p != NULL; p = LIST_NEXT(&proc, p_list)) {
if (KREAD(kd, (u_long)p, &proc)) {
_kvm_err(kd, kd->program, "can't read proc at %x", p);
goto fail;
}
if (proc.p_state == PRS_NEW)
continue;
if (proc.p_fd == NULL)
continue;
if (KREAD(kd, (u_long)p->p_fd, &filed)) {
_kvm_err(kd, kd->program, "can't read filedesc at %x",
p->p_fd);
goto fail;
}
if (filed.fd_lastfile + 1 > ocnt) {
ocnt = filed.fd_lastfile + 1;
free(ofiles);
ofiles = (struct file **)_kvm_malloc(kd,
ocnt * sizeof(struct file *));
if (ofiles == 0)
return (0);
}
if (KREADN(kd, (u_long)filed.fd_ofiles, ofiles,
ocnt * sizeof(struct file *))) {
_kvm_err(kd, kd->program, "can't read ofiles at %x",
filed.fd_ofiles);
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return (0);
}
for (i = 0; i <= filed.fd_lastfile; i++) {
if ((fp = ofiles[i]) == NULL)
continue;
/*
* copyout filehead (legacy)
*/
if (!once) {
*(struct file **)kd->argspc = fp;
*(struct file **)where = fp;
buflen -= sizeof (fp);
where += sizeof (fp);
once = 1;
}
if (buflen < sizeof (struct file))
goto fail;
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if (KREAD(kd, (long)fp, ((struct file *)where))) {
_kvm_err(kd, kd->program, "can't read kfp");
goto fail;
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}
buflen -= sizeof (struct file);
fp = (struct file *)where;
where += sizeof (struct file);
n++;
}
}
free(ofiles);
return (n);
fail:
free(ofiles);
return (0);
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}
char *
kvm_getfiles(kd, op, arg, cnt)
kvm_t *kd;
int op, arg;
int *cnt;
{
int mib[2], st, n, nfiles, nprocs;
size_t size;
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_kvm_syserr(kd, kd->program, "kvm_getfiles has been broken for years");
return (0);
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if (ISALIVE(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_getfiles");
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return (0);
}
if (kd->argspc == 0)
kd->argspc = (char *)_kvm_malloc(kd, size);
else if (kd->arglen < size)
kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size);
if (kd->argspc == 0)
return (0);
kd->arglen = size;
st = sysctl(mib, 2, kd->argspc, &size, NULL, 0);
if (st != 0) {
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_kvm_syserr(kd, kd->program, "kvm_getfiles");
return (0);
}
nfiles = size / sizeof(struct xfile);
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} else {
struct nlist nl[4], *p;
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nl[0].n_name = "_allproc";
nl[1].n_name = "_nprocs";
nl[2].n_name = "_nfiles";
nl[3].n_name = 0;
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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[1].n_value, &nprocs)) {
_kvm_err(kd, kd->program, "can't read nprocs");
return (0);
}
if (KREAD(kd, nl[2].n_value, &nfiles)) {
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_kvm_err(kd, kd->program, "can't read nfiles");
return (0);
}
size = sizeof(void *) + (nfiles + 10) * sizeof(struct file);
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if (kd->argspc == 0)
kd->argspc = (char *)_kvm_malloc(kd, size);
else if (kd->arglen < size)
kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size);
if (kd->argspc == 0)
return (0);
kd->arglen = size;
n = kvm_deadfiles(kd, op, arg, nl[0].n_value, nprocs);
if (n != nfiles) {
_kvm_err(kd, kd->program, "inconsistant nfiles");
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return (0);
}
nfiles = n;
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}
*cnt = nfiles;
return (kd->argspc);
}