b1e4abd246
vnodes. This will hopefully serve as a base from which we can expand the MP code. We currently do not attempt to obtain any mutex or SX locks, but the door is open to add them when we nail down exactly how that part of it is going to work.
1840 lines
40 KiB
C
1840 lines
40 KiB
C
/*
|
|
* Copyright (c) 1982, 1986, 1989, 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
* (c) UNIX System Laboratories, Inc.
|
|
* All or some portions of this file are derived from material licensed
|
|
* to the University of California by American Telephone and Telegraph
|
|
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
|
|
* the permission of UNIX System Laboratories, Inc.
|
|
*
|
|
* 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 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.
|
|
*
|
|
* @(#)kern_descrip.c 8.6 (Berkeley) 4/19/94
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include "opt_compat.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/sysproto.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/filedesc.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/file.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/filio.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/unistd.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/event.h>
|
|
#include <sys/sx.h>
|
|
#include <sys/socketvar.h>
|
|
|
|
#include <machine/limits.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_extern.h>
|
|
|
|
static MALLOC_DEFINE(M_FILEDESC, "file desc", "Open file descriptor table");
|
|
MALLOC_DEFINE(M_FILE, "file", "Open file structure");
|
|
static MALLOC_DEFINE(M_SIGIO, "sigio", "sigio structures");
|
|
|
|
static d_open_t fdopen;
|
|
#define NUMFDESC 64
|
|
|
|
#define CDEV_MAJOR 22
|
|
static struct cdevsw fildesc_cdevsw = {
|
|
/* open */ fdopen,
|
|
/* close */ noclose,
|
|
/* read */ noread,
|
|
/* write */ nowrite,
|
|
/* ioctl */ noioctl,
|
|
/* poll */ nopoll,
|
|
/* mmap */ nommap,
|
|
/* strategy */ nostrategy,
|
|
/* name */ "FD",
|
|
/* maj */ CDEV_MAJOR,
|
|
/* dump */ nodump,
|
|
/* psize */ nopsize,
|
|
/* flags */ 0,
|
|
};
|
|
|
|
static int do_dup __P((struct filedesc *fdp, int old, int new, register_t *retval, struct thread *td));
|
|
static int badfo_readwrite __P((struct file *fp, struct uio *uio,
|
|
struct ucred *cred, int flags, struct thread *td));
|
|
static int badfo_ioctl __P((struct file *fp, u_long com, caddr_t data,
|
|
struct thread *td));
|
|
static int badfo_poll __P((struct file *fp, int events,
|
|
struct ucred *cred, struct thread *td));
|
|
static int badfo_kqfilter __P((struct file *fp, struct knote *kn));
|
|
static int badfo_stat __P((struct file *fp, struct stat *sb, struct thread *td));
|
|
static int badfo_close __P((struct file *fp, struct thread *td));
|
|
|
|
/*
|
|
* Descriptor management.
|
|
*/
|
|
struct filelist filehead; /* head of list of open files */
|
|
int nfiles; /* actual number of open files */
|
|
extern int cmask;
|
|
|
|
/*
|
|
* System calls on descriptors.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct getdtablesize_args {
|
|
int dummy;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
getdtablesize(td, uap)
|
|
struct thread *td;
|
|
struct getdtablesize_args *uap;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
|
|
mtx_lock(&Giant);
|
|
td->td_retval[0] =
|
|
min((int)p->p_rlimit[RLIMIT_NOFILE].rlim_cur, maxfilesperproc);
|
|
mtx_unlock(&Giant);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Duplicate a file descriptor to a particular value.
|
|
*
|
|
* note: keep in mind that a potential race condition exists when closing
|
|
* descriptors from a shared descriptor table (via rfork).
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct dup2_args {
|
|
u_int from;
|
|
u_int to;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
dup2(td, uap)
|
|
struct thread *td;
|
|
struct dup2_args *uap;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
register struct filedesc *fdp = td->td_proc->p_fd;
|
|
register u_int old = uap->from, new = uap->to;
|
|
int i, error;
|
|
|
|
mtx_lock(&Giant);
|
|
retry:
|
|
if (old >= fdp->fd_nfiles ||
|
|
fdp->fd_ofiles[old] == NULL ||
|
|
new >= p->p_rlimit[RLIMIT_NOFILE].rlim_cur ||
|
|
new >= maxfilesperproc) {
|
|
error = EBADF;
|
|
goto done2;
|
|
}
|
|
if (old == new) {
|
|
td->td_retval[0] = new;
|
|
error = 0;
|
|
goto done2;
|
|
}
|
|
if (new >= fdp->fd_nfiles) {
|
|
if ((error = fdalloc(td, new, &i)))
|
|
goto done2;
|
|
if (new != i)
|
|
panic("dup2: fdalloc");
|
|
/*
|
|
* fdalloc() may block, retest everything.
|
|
*/
|
|
goto retry;
|
|
}
|
|
error = do_dup(fdp, (int)old, (int)new, td->td_retval, td);
|
|
done2:
|
|
mtx_unlock(&Giant);
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* Duplicate a file descriptor.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct dup_args {
|
|
u_int fd;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
dup(td, uap)
|
|
struct thread *td;
|
|
struct dup_args *uap;
|
|
{
|
|
register struct filedesc *fdp;
|
|
u_int old;
|
|
int new, error;
|
|
|
|
mtx_lock(&Giant);
|
|
old = uap->fd;
|
|
fdp = td->td_proc->p_fd;
|
|
if (old >= fdp->fd_nfiles || fdp->fd_ofiles[old] == NULL) {
|
|
error = EBADF;
|
|
goto done2;
|
|
}
|
|
if ((error = fdalloc(td, 0, &new)))
|
|
goto done2;
|
|
error = do_dup(fdp, (int)old, new, td->td_retval, td);
|
|
done2:
|
|
mtx_unlock(&Giant);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* The file control system call.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct fcntl_args {
|
|
int fd;
|
|
int cmd;
|
|
long arg;
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|
};
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|
#endif
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|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
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|
fcntl(td, uap)
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|
struct thread *td;
|
|
register struct fcntl_args *uap;
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|
{
|
|
register struct proc *p = td->td_proc;
|
|
register struct filedesc *fdp;
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|
register struct file *fp;
|
|
register char *pop;
|
|
struct vnode *vp;
|
|
int i, tmp, error = 0, flg = F_POSIX;
|
|
struct flock fl;
|
|
u_int newmin;
|
|
|
|
mtx_lock(&Giant);
|
|
|
|
fdp = p->p_fd;
|
|
if ((unsigned)uap->fd >= fdp->fd_nfiles ||
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|
(fp = fdp->fd_ofiles[uap->fd]) == NULL) {
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|
error = EBADF;
|
|
goto done2;
|
|
}
|
|
pop = &fdp->fd_ofileflags[uap->fd];
|
|
|
|
switch (uap->cmd) {
|
|
case F_DUPFD:
|
|
newmin = uap->arg;
|
|
if (newmin >= p->p_rlimit[RLIMIT_NOFILE].rlim_cur ||
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|
newmin >= maxfilesperproc) {
|
|
error = EINVAL;
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|
break;
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|
}
|
|
if ((error = fdalloc(td, newmin, &i)))
|
|
break;
|
|
error = do_dup(fdp, uap->fd, i, td->td_retval, td);
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|
break;
|
|
|
|
case F_GETFD:
|
|
td->td_retval[0] = *pop & 1;
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|
break;
|
|
|
|
case F_SETFD:
|
|
*pop = (*pop &~ 1) | (uap->arg & 1);
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|
break;
|
|
|
|
case F_GETFL:
|
|
td->td_retval[0] = OFLAGS(fp->f_flag);
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|
break;
|
|
|
|
case F_SETFL:
|
|
fhold(fp);
|
|
fp->f_flag &= ~FCNTLFLAGS;
|
|
fp->f_flag |= FFLAGS(uap->arg & ~O_ACCMODE) & FCNTLFLAGS;
|
|
tmp = fp->f_flag & FNONBLOCK;
|
|
error = fo_ioctl(fp, FIONBIO, (caddr_t)&tmp, td);
|
|
if (error) {
|
|
fdrop(fp, td);
|
|
break;
|
|
}
|
|
tmp = fp->f_flag & FASYNC;
|
|
error = fo_ioctl(fp, FIOASYNC, (caddr_t)&tmp, td);
|
|
if (!error) {
|
|
fdrop(fp, td);
|
|
break;
|
|
}
|
|
fp->f_flag &= ~FNONBLOCK;
|
|
tmp = 0;
|
|
(void)fo_ioctl(fp, FIONBIO, (caddr_t)&tmp, td);
|
|
fdrop(fp, td);
|
|
break;
|
|
|
|
case F_GETOWN:
|
|
fhold(fp);
|
|
error = fo_ioctl(fp, FIOGETOWN, (caddr_t)td->td_retval, td);
|
|
fdrop(fp, td);
|
|
break;
|
|
|
|
case F_SETOWN:
|
|
fhold(fp);
|
|
error = fo_ioctl(fp, FIOSETOWN, (caddr_t)&uap->arg, td);
|
|
fdrop(fp, td);
|
|
break;
|
|
|
|
case F_SETLKW:
|
|
flg |= F_WAIT;
|
|
/* Fall into F_SETLK */
|
|
|
|
case F_SETLK:
|
|
if (fp->f_type != DTYPE_VNODE) {
|
|
error = EBADF;
|
|
break;
|
|
}
|
|
vp = (struct vnode *)fp->f_data;
|
|
|
|
/*
|
|
* copyin/lockop may block
|
|
*/
|
|
fhold(fp);
|
|
/* Copy in the lock structure */
|
|
error = copyin((caddr_t)(intptr_t)uap->arg, (caddr_t)&fl,
|
|
sizeof(fl));
|
|
if (error) {
|
|
fdrop(fp, td);
|
|
break;
|
|
}
|
|
if (fl.l_whence == SEEK_CUR) {
|
|
if (fp->f_offset < 0 ||
|
|
(fl.l_start > 0 &&
|
|
fp->f_offset > OFF_MAX - fl.l_start)) {
|
|
fdrop(fp, td);
|
|
error = EOVERFLOW;
|
|
break;
|
|
}
|
|
fl.l_start += fp->f_offset;
|
|
}
|
|
|
|
switch (fl.l_type) {
|
|
case F_RDLCK:
|
|
if ((fp->f_flag & FREAD) == 0) {
|
|
error = EBADF;
|
|
break;
|
|
}
|
|
p->p_flag |= P_ADVLOCK;
|
|
error = VOP_ADVLOCK(vp, (caddr_t)p->p_leader, F_SETLK,
|
|
&fl, flg);
|
|
break;
|
|
case F_WRLCK:
|
|
if ((fp->f_flag & FWRITE) == 0) {
|
|
error = EBADF;
|
|
break;
|
|
}
|
|
p->p_flag |= P_ADVLOCK;
|
|
error = VOP_ADVLOCK(vp, (caddr_t)p->p_leader, F_SETLK,
|
|
&fl, flg);
|
|
break;
|
|
case F_UNLCK:
|
|
error = VOP_ADVLOCK(vp, (caddr_t)p->p_leader, F_UNLCK,
|
|
&fl, F_POSIX);
|
|
break;
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
fdrop(fp, td);
|
|
break;
|
|
|
|
case F_GETLK:
|
|
if (fp->f_type != DTYPE_VNODE) {
|
|
error = EBADF;
|
|
break;
|
|
}
|
|
vp = (struct vnode *)fp->f_data;
|
|
/*
|
|
* copyin/lockop may block
|
|
*/
|
|
fhold(fp);
|
|
/* Copy in the lock structure */
|
|
error = copyin((caddr_t)(intptr_t)uap->arg, (caddr_t)&fl,
|
|
sizeof(fl));
|
|
if (error) {
|
|
fdrop(fp, td);
|
|
break;
|
|
}
|
|
if (fl.l_type != F_RDLCK && fl.l_type != F_WRLCK &&
|
|
fl.l_type != F_UNLCK) {
|
|
fdrop(fp, td);
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
if (fl.l_whence == SEEK_CUR) {
|
|
if ((fl.l_start > 0 &&
|
|
fp->f_offset > OFF_MAX - fl.l_start) ||
|
|
(fl.l_start < 0 &&
|
|
fp->f_offset < OFF_MIN - fl.l_start)) {
|
|
fdrop(fp, td);
|
|
error = EOVERFLOW;
|
|
break;
|
|
}
|
|
fl.l_start += fp->f_offset;
|
|
}
|
|
error = VOP_ADVLOCK(vp, (caddr_t)p->p_leader, F_GETLK,
|
|
&fl, F_POSIX);
|
|
fdrop(fp, td);
|
|
if (error == 0) {
|
|
error = copyout((caddr_t)&fl,
|
|
(caddr_t)(intptr_t)uap->arg, sizeof(fl));
|
|
}
|
|
break;
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
done2:
|
|
mtx_unlock(&Giant);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Common code for dup, dup2, and fcntl(F_DUPFD).
|
|
*/
|
|
static int
|
|
do_dup(fdp, old, new, retval, td)
|
|
register struct filedesc *fdp;
|
|
register int old, new;
|
|
register_t *retval;
|
|
struct thread *td;
|
|
{
|
|
struct file *fp;
|
|
struct file *delfp;
|
|
|
|
/*
|
|
* Save info on the descriptor being overwritten. We have
|
|
* to do the unmap now, but we cannot close it without
|
|
* introducing an ownership race for the slot.
|
|
*/
|
|
delfp = fdp->fd_ofiles[new];
|
|
#if 0
|
|
if (delfp && (fdp->fd_ofileflags[new] & UF_MAPPED))
|
|
(void) munmapfd(td, new);
|
|
#endif
|
|
|
|
/*
|
|
* Duplicate the source descriptor, update lastfile
|
|
*/
|
|
fp = fdp->fd_ofiles[old];
|
|
fdp->fd_ofiles[new] = fp;
|
|
fdp->fd_ofileflags[new] = fdp->fd_ofileflags[old] &~ UF_EXCLOSE;
|
|
fhold(fp);
|
|
if (new > fdp->fd_lastfile)
|
|
fdp->fd_lastfile = new;
|
|
*retval = new;
|
|
|
|
/*
|
|
* If we dup'd over a valid file, we now own the reference to it
|
|
* and must dispose of it using closef() semantics (as if a
|
|
* close() were performed on it).
|
|
*/
|
|
if (delfp)
|
|
(void) closef(delfp, td);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* If sigio is on the list associated with a process or process group,
|
|
* disable signalling from the device, remove sigio from the list and
|
|
* free sigio.
|
|
*/
|
|
void
|
|
funsetown(sigio)
|
|
struct sigio *sigio;
|
|
{
|
|
int s;
|
|
|
|
if (sigio == NULL)
|
|
return;
|
|
s = splhigh();
|
|
*(sigio->sio_myref) = NULL;
|
|
splx(s);
|
|
if (sigio->sio_pgid < 0) {
|
|
SLIST_REMOVE(&sigio->sio_pgrp->pg_sigiolst, sigio,
|
|
sigio, sio_pgsigio);
|
|
} else /* if ((*sigiop)->sio_pgid > 0) */ {
|
|
SLIST_REMOVE(&sigio->sio_proc->p_sigiolst, sigio,
|
|
sigio, sio_pgsigio);
|
|
}
|
|
crfree(sigio->sio_ucred);
|
|
FREE(sigio, M_SIGIO);
|
|
}
|
|
|
|
/* Free a list of sigio structures. */
|
|
void
|
|
funsetownlst(sigiolst)
|
|
struct sigiolst *sigiolst;
|
|
{
|
|
struct sigio *sigio;
|
|
|
|
while ((sigio = SLIST_FIRST(sigiolst)) != NULL)
|
|
funsetown(sigio);
|
|
}
|
|
|
|
/*
|
|
* This is common code for FIOSETOWN ioctl called by fcntl(fd, F_SETOWN, arg).
|
|
*
|
|
* After permission checking, add a sigio structure to the sigio list for
|
|
* the process or process group.
|
|
*/
|
|
int
|
|
fsetown(pgid, sigiop)
|
|
pid_t pgid;
|
|
struct sigio **sigiop;
|
|
{
|
|
struct proc *proc;
|
|
struct pgrp *pgrp;
|
|
struct sigio *sigio;
|
|
int s;
|
|
|
|
if (pgid == 0) {
|
|
funsetown(*sigiop);
|
|
return (0);
|
|
}
|
|
if (pgid > 0) {
|
|
proc = pfind(pgid);
|
|
if (proc == NULL)
|
|
return (ESRCH);
|
|
|
|
/*
|
|
* Policy - Don't allow a process to FSETOWN a process
|
|
* in another session.
|
|
*
|
|
* Remove this test to allow maximum flexibility or
|
|
* restrict FSETOWN to the current process or process
|
|
* group for maximum safety.
|
|
*/
|
|
if (proc->p_session != curthread->td_proc->p_session) {
|
|
PROC_UNLOCK(proc);
|
|
return (EPERM);
|
|
}
|
|
PROC_UNLOCK(proc);
|
|
|
|
pgrp = NULL;
|
|
} else /* if (pgid < 0) */ {
|
|
pgrp = pgfind(-pgid);
|
|
if (pgrp == NULL)
|
|
return (ESRCH);
|
|
|
|
/*
|
|
* Policy - Don't allow a process to FSETOWN a process
|
|
* in another session.
|
|
*
|
|
* Remove this test to allow maximum flexibility or
|
|
* restrict FSETOWN to the current process or process
|
|
* group for maximum safety.
|
|
*/
|
|
if (pgrp->pg_session != curthread->td_proc->p_session)
|
|
return (EPERM);
|
|
|
|
proc = NULL;
|
|
}
|
|
funsetown(*sigiop);
|
|
MALLOC(sigio, struct sigio *, sizeof(struct sigio), M_SIGIO, M_WAITOK);
|
|
if (pgid > 0) {
|
|
SLIST_INSERT_HEAD(&proc->p_sigiolst, sigio, sio_pgsigio);
|
|
sigio->sio_proc = proc;
|
|
} else {
|
|
SLIST_INSERT_HEAD(&pgrp->pg_sigiolst, sigio, sio_pgsigio);
|
|
sigio->sio_pgrp = pgrp;
|
|
}
|
|
sigio->sio_pgid = pgid;
|
|
sigio->sio_ucred = crhold(curthread->td_proc->p_ucred);
|
|
sigio->sio_myref = sigiop;
|
|
s = splhigh();
|
|
*sigiop = sigio;
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* This is common code for FIOGETOWN ioctl called by fcntl(fd, F_GETOWN, arg).
|
|
*/
|
|
pid_t
|
|
fgetown(sigio)
|
|
struct sigio *sigio;
|
|
{
|
|
return (sigio != NULL ? sigio->sio_pgid : 0);
|
|
}
|
|
|
|
/*
|
|
* Close a file descriptor.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct close_args {
|
|
int fd;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
close(td, uap)
|
|
struct thread *td;
|
|
struct close_args *uap;
|
|
{
|
|
register struct filedesc *fdp;
|
|
register struct file *fp;
|
|
register int fd = uap->fd;
|
|
int error = 0;
|
|
|
|
mtx_lock(&Giant);
|
|
fdp = td->td_proc->p_fd;
|
|
if ((unsigned)fd >= fdp->fd_nfiles ||
|
|
(fp = fdp->fd_ofiles[fd]) == NULL) {
|
|
error = EBADF;
|
|
goto done2;
|
|
}
|
|
#if 0
|
|
if (fdp->fd_ofileflags[fd] & UF_MAPPED)
|
|
(void) munmapfd(td, fd);
|
|
#endif
|
|
fdp->fd_ofiles[fd] = NULL;
|
|
fdp->fd_ofileflags[fd] = 0;
|
|
|
|
/*
|
|
* we now hold the fp reference that used to be owned by the descriptor
|
|
* array.
|
|
*/
|
|
while (fdp->fd_lastfile > 0 && fdp->fd_ofiles[fdp->fd_lastfile] == NULL)
|
|
fdp->fd_lastfile--;
|
|
if (fd < fdp->fd_freefile)
|
|
fdp->fd_freefile = fd;
|
|
if (fd < fdp->fd_knlistsize)
|
|
knote_fdclose(td, fd);
|
|
error = closef(fp, td);
|
|
done2:
|
|
mtx_unlock(&Giant);
|
|
return(error);
|
|
}
|
|
|
|
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
|
|
/*
|
|
* Return status information about a file descriptor.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct ofstat_args {
|
|
int fd;
|
|
struct ostat *sb;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
ofstat(td, uap)
|
|
struct thread *td;
|
|
register struct ofstat_args *uap;
|
|
{
|
|
struct file *fp;
|
|
struct stat ub;
|
|
struct ostat oub;
|
|
int error;
|
|
|
|
mtx_lock(&Giant);
|
|
if ((error = fget(td, uap->fd, &fp)) != 0)
|
|
goto done2;
|
|
error = fo_stat(fp, &ub, td);
|
|
if (error == 0) {
|
|
cvtstat(&ub, &oub);
|
|
error = copyout((caddr_t)&oub, (caddr_t)uap->sb, sizeof (oub));
|
|
}
|
|
fdrop(fp, td);
|
|
done2:
|
|
mtx_unlock(&Giant);
|
|
return (error);
|
|
}
|
|
#endif /* COMPAT_43 || COMPAT_SUNOS */
|
|
|
|
/*
|
|
* Return status information about a file descriptor.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct fstat_args {
|
|
int fd;
|
|
struct stat *sb;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
fstat(td, uap)
|
|
struct thread *td;
|
|
struct fstat_args *uap;
|
|
{
|
|
struct file *fp;
|
|
struct stat ub;
|
|
int error;
|
|
|
|
mtx_lock(&Giant);
|
|
if ((error = fget(td, uap->fd, &fp)) != 0)
|
|
goto done2;
|
|
error = fo_stat(fp, &ub, td);
|
|
if (error == 0)
|
|
error = copyout((caddr_t)&ub, (caddr_t)uap->sb, sizeof (ub));
|
|
fdrop(fp, td);
|
|
done2:
|
|
mtx_unlock(&Giant);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Return status information about a file descriptor.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct nfstat_args {
|
|
int fd;
|
|
struct nstat *sb;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
nfstat(td, uap)
|
|
struct thread *td;
|
|
register struct nfstat_args *uap;
|
|
{
|
|
struct file *fp;
|
|
struct stat ub;
|
|
struct nstat nub;
|
|
int error;
|
|
|
|
mtx_lock(&Giant);
|
|
if ((error = fget(td, uap->fd, &fp)) != 0)
|
|
goto done2;
|
|
error = fo_stat(fp, &ub, td);
|
|
if (error == 0) {
|
|
cvtnstat(&ub, &nub);
|
|
error = copyout((caddr_t)&nub, (caddr_t)uap->sb, sizeof (nub));
|
|
}
|
|
fdrop(fp, td);
|
|
done2:
|
|
mtx_unlock(&Giant);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Return pathconf information about a file descriptor.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct fpathconf_args {
|
|
int fd;
|
|
int name;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
fpathconf(td, uap)
|
|
struct thread *td;
|
|
register struct fpathconf_args *uap;
|
|
{
|
|
struct file *fp;
|
|
struct vnode *vp;
|
|
int error;
|
|
|
|
mtx_lock(&Giant);
|
|
if ((error = fget(td, uap->fd, &fp)) != 0)
|
|
goto done2;
|
|
|
|
switch (fp->f_type) {
|
|
case DTYPE_PIPE:
|
|
case DTYPE_SOCKET:
|
|
if (uap->name != _PC_PIPE_BUF) {
|
|
error = EINVAL;
|
|
goto done2;
|
|
}
|
|
td->td_retval[0] = PIPE_BUF;
|
|
error = 0;
|
|
break;
|
|
case DTYPE_FIFO:
|
|
case DTYPE_VNODE:
|
|
vp = (struct vnode *)fp->f_data;
|
|
error = VOP_PATHCONF(vp, uap->name, td->td_retval);
|
|
break;
|
|
default:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
}
|
|
fdrop(fp, td);
|
|
done2:
|
|
mtx_unlock(&Giant);
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* Allocate a file descriptor for the process.
|
|
*/
|
|
static int fdexpand;
|
|
SYSCTL_INT(_debug, OID_AUTO, fdexpand, CTLFLAG_RD, &fdexpand, 0, "");
|
|
|
|
int
|
|
fdalloc(td, want, result)
|
|
struct thread *td;
|
|
int want;
|
|
int *result;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
register struct filedesc *fdp = td->td_proc->p_fd;
|
|
register int i;
|
|
int lim, last, nfiles;
|
|
struct file **newofile;
|
|
char *newofileflags;
|
|
|
|
/*
|
|
* Search for a free descriptor starting at the higher
|
|
* of want or fd_freefile. If that fails, consider
|
|
* expanding the ofile array.
|
|
*/
|
|
lim = min((int)p->p_rlimit[RLIMIT_NOFILE].rlim_cur, maxfilesperproc);
|
|
for (;;) {
|
|
last = min(fdp->fd_nfiles, lim);
|
|
if ((i = want) < fdp->fd_freefile)
|
|
i = fdp->fd_freefile;
|
|
for (; i < last; i++) {
|
|
if (fdp->fd_ofiles[i] == NULL) {
|
|
fdp->fd_ofileflags[i] = 0;
|
|
if (i > fdp->fd_lastfile)
|
|
fdp->fd_lastfile = i;
|
|
if (want <= fdp->fd_freefile)
|
|
fdp->fd_freefile = i;
|
|
*result = i;
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* No space in current array. Expand?
|
|
*/
|
|
if (fdp->fd_nfiles >= lim)
|
|
return (EMFILE);
|
|
if (fdp->fd_nfiles < NDEXTENT)
|
|
nfiles = NDEXTENT;
|
|
else
|
|
nfiles = 2 * fdp->fd_nfiles;
|
|
MALLOC(newofile, struct file **, nfiles * OFILESIZE,
|
|
M_FILEDESC, M_WAITOK);
|
|
|
|
/*
|
|
* deal with file-table extend race that might have occured
|
|
* when malloc was blocked.
|
|
*/
|
|
if (fdp->fd_nfiles >= nfiles) {
|
|
FREE(newofile, M_FILEDESC);
|
|
continue;
|
|
}
|
|
newofileflags = (char *) &newofile[nfiles];
|
|
/*
|
|
* Copy the existing ofile and ofileflags arrays
|
|
* and zero the new portion of each array.
|
|
*/
|
|
bcopy(fdp->fd_ofiles, newofile,
|
|
(i = sizeof(struct file *) * fdp->fd_nfiles));
|
|
bzero((char *)newofile + i, nfiles * sizeof(struct file *) - i);
|
|
bcopy(fdp->fd_ofileflags, newofileflags,
|
|
(i = sizeof(char) * fdp->fd_nfiles));
|
|
bzero(newofileflags + i, nfiles * sizeof(char) - i);
|
|
if (fdp->fd_nfiles > NDFILE)
|
|
FREE(fdp->fd_ofiles, M_FILEDESC);
|
|
fdp->fd_ofiles = newofile;
|
|
fdp->fd_ofileflags = newofileflags;
|
|
fdp->fd_nfiles = nfiles;
|
|
fdexpand++;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Check to see whether n user file descriptors
|
|
* are available to the process p.
|
|
*/
|
|
int
|
|
fdavail(td, n)
|
|
struct thread *td;
|
|
register int n;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
register struct filedesc *fdp = td->td_proc->p_fd;
|
|
register struct file **fpp;
|
|
register int i, lim, last;
|
|
|
|
lim = min((int)p->p_rlimit[RLIMIT_NOFILE].rlim_cur, maxfilesperproc);
|
|
if ((i = lim - fdp->fd_nfiles) > 0 && (n -= i) <= 0)
|
|
return (1);
|
|
|
|
last = min(fdp->fd_nfiles, lim);
|
|
fpp = &fdp->fd_ofiles[fdp->fd_freefile];
|
|
for (i = last - fdp->fd_freefile; --i >= 0; fpp++) {
|
|
if (*fpp == NULL && --n <= 0)
|
|
return (1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Create a new open file structure and allocate
|
|
* a file decriptor for the process that refers to it.
|
|
*/
|
|
int
|
|
falloc(td, resultfp, resultfd)
|
|
register struct thread *td;
|
|
struct file **resultfp;
|
|
int *resultfd;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
register struct file *fp, *fq;
|
|
int error, i;
|
|
|
|
if (nfiles >= maxfiles) {
|
|
tablefull("file");
|
|
return (ENFILE);
|
|
}
|
|
/*
|
|
* Allocate a new file descriptor.
|
|
* If the process has file descriptor zero open, add to the list
|
|
* of open files at that point, otherwise put it at the front of
|
|
* the list of open files.
|
|
*/
|
|
nfiles++;
|
|
MALLOC(fp, struct file *, sizeof(struct file), M_FILE, M_WAITOK | M_ZERO);
|
|
|
|
/*
|
|
* wait until after malloc (which may have blocked) returns before
|
|
* allocating the slot, else a race might have shrunk it if we had
|
|
* allocated it before the malloc.
|
|
*/
|
|
if ((error = fdalloc(td, 0, &i))) {
|
|
nfiles--;
|
|
FREE(fp, M_FILE);
|
|
return (error);
|
|
}
|
|
fp->f_count = 1;
|
|
fp->f_cred = crhold(p->p_ucred);
|
|
fp->f_ops = &badfileops;
|
|
fp->f_seqcount = 1;
|
|
if ((fq = p->p_fd->fd_ofiles[0])) {
|
|
LIST_INSERT_AFTER(fq, fp, f_list);
|
|
} else {
|
|
LIST_INSERT_HEAD(&filehead, fp, f_list);
|
|
}
|
|
p->p_fd->fd_ofiles[i] = fp;
|
|
if (resultfp)
|
|
*resultfp = fp;
|
|
if (resultfd)
|
|
*resultfd = i;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Free a file descriptor.
|
|
*/
|
|
void
|
|
ffree(fp)
|
|
register struct file *fp;
|
|
{
|
|
KASSERT((fp->f_count == 0), ("ffree: fp_fcount not 0!"));
|
|
LIST_REMOVE(fp, f_list);
|
|
crfree(fp->f_cred);
|
|
nfiles--;
|
|
FREE(fp, M_FILE);
|
|
}
|
|
|
|
/*
|
|
* Build a new filedesc structure.
|
|
*/
|
|
struct filedesc *
|
|
fdinit(td)
|
|
struct thread *td;
|
|
{
|
|
register struct filedesc0 *newfdp;
|
|
register struct filedesc *fdp = td->td_proc->p_fd;
|
|
|
|
MALLOC(newfdp, struct filedesc0 *, sizeof(struct filedesc0),
|
|
M_FILEDESC, M_WAITOK | M_ZERO);
|
|
newfdp->fd_fd.fd_cdir = fdp->fd_cdir;
|
|
if (newfdp->fd_fd.fd_cdir)
|
|
VREF(newfdp->fd_fd.fd_cdir);
|
|
newfdp->fd_fd.fd_rdir = fdp->fd_rdir;
|
|
if (newfdp->fd_fd.fd_rdir)
|
|
VREF(newfdp->fd_fd.fd_rdir);
|
|
newfdp->fd_fd.fd_jdir = fdp->fd_jdir;
|
|
if (newfdp->fd_fd.fd_jdir)
|
|
VREF(newfdp->fd_fd.fd_jdir);
|
|
|
|
/* Create the file descriptor table. */
|
|
newfdp->fd_fd.fd_refcnt = 1;
|
|
newfdp->fd_fd.fd_cmask = cmask;
|
|
newfdp->fd_fd.fd_ofiles = newfdp->fd_dfiles;
|
|
newfdp->fd_fd.fd_ofileflags = newfdp->fd_dfileflags;
|
|
newfdp->fd_fd.fd_nfiles = NDFILE;
|
|
newfdp->fd_fd.fd_knlistsize = -1;
|
|
|
|
return (&newfdp->fd_fd);
|
|
}
|
|
|
|
/*
|
|
* Share a filedesc structure.
|
|
*/
|
|
struct filedesc *
|
|
fdshare(p)
|
|
struct proc *p;
|
|
{
|
|
p->p_fd->fd_refcnt++;
|
|
return (p->p_fd);
|
|
}
|
|
|
|
/*
|
|
* Copy a filedesc structure.
|
|
*/
|
|
struct filedesc *
|
|
fdcopy(td)
|
|
struct thread *td;
|
|
{
|
|
register struct filedesc *newfdp, *fdp = td->td_proc->p_fd;
|
|
register struct file **fpp;
|
|
register int i;
|
|
|
|
/* Certain daemons might not have file descriptors. */
|
|
if (fdp == NULL)
|
|
return (NULL);
|
|
|
|
MALLOC(newfdp, struct filedesc *, sizeof(struct filedesc0),
|
|
M_FILEDESC, M_WAITOK);
|
|
bcopy(fdp, newfdp, sizeof(struct filedesc));
|
|
if (newfdp->fd_cdir)
|
|
VREF(newfdp->fd_cdir);
|
|
if (newfdp->fd_rdir)
|
|
VREF(newfdp->fd_rdir);
|
|
if (newfdp->fd_jdir)
|
|
VREF(newfdp->fd_jdir);
|
|
newfdp->fd_refcnt = 1;
|
|
|
|
/*
|
|
* If the number of open files fits in the internal arrays
|
|
* of the open file structure, use them, otherwise allocate
|
|
* additional memory for the number of descriptors currently
|
|
* in use.
|
|
*/
|
|
if (newfdp->fd_lastfile < NDFILE) {
|
|
newfdp->fd_ofiles = ((struct filedesc0 *) newfdp)->fd_dfiles;
|
|
newfdp->fd_ofileflags =
|
|
((struct filedesc0 *) newfdp)->fd_dfileflags;
|
|
i = NDFILE;
|
|
} else {
|
|
/*
|
|
* Compute the smallest multiple of NDEXTENT needed
|
|
* for the file descriptors currently in use,
|
|
* allowing the table to shrink.
|
|
*/
|
|
i = newfdp->fd_nfiles;
|
|
while (i > 2 * NDEXTENT && i > newfdp->fd_lastfile * 2)
|
|
i /= 2;
|
|
MALLOC(newfdp->fd_ofiles, struct file **, i * OFILESIZE,
|
|
M_FILEDESC, M_WAITOK);
|
|
newfdp->fd_ofileflags = (char *) &newfdp->fd_ofiles[i];
|
|
}
|
|
newfdp->fd_nfiles = i;
|
|
bcopy(fdp->fd_ofiles, newfdp->fd_ofiles, i * sizeof(struct file **));
|
|
bcopy(fdp->fd_ofileflags, newfdp->fd_ofileflags, i * sizeof(char));
|
|
|
|
/*
|
|
* kq descriptors cannot be copied.
|
|
*/
|
|
if (newfdp->fd_knlistsize != -1) {
|
|
fpp = newfdp->fd_ofiles;
|
|
for (i = newfdp->fd_lastfile; i-- >= 0; fpp++) {
|
|
if (*fpp != NULL && (*fpp)->f_type == DTYPE_KQUEUE)
|
|
*fpp = NULL;
|
|
}
|
|
newfdp->fd_knlist = NULL;
|
|
newfdp->fd_knlistsize = -1;
|
|
newfdp->fd_knhash = NULL;
|
|
newfdp->fd_knhashmask = 0;
|
|
}
|
|
|
|
fpp = newfdp->fd_ofiles;
|
|
for (i = newfdp->fd_lastfile; i-- >= 0; fpp++) {
|
|
if (*fpp != NULL)
|
|
fhold(*fpp);
|
|
}
|
|
return (newfdp);
|
|
}
|
|
|
|
/*
|
|
* Release a filedesc structure.
|
|
*/
|
|
void
|
|
fdfree(td)
|
|
struct thread *td;
|
|
{
|
|
register struct filedesc *fdp = td->td_proc->p_fd;
|
|
struct file **fpp;
|
|
register int i;
|
|
|
|
/* Certain daemons might not have file descriptors. */
|
|
if (fdp == NULL)
|
|
return;
|
|
|
|
if (--fdp->fd_refcnt > 0)
|
|
return;
|
|
/*
|
|
* we are the last reference to the structure, we can
|
|
* safely assume it will not change out from under us.
|
|
*/
|
|
fpp = fdp->fd_ofiles;
|
|
for (i = fdp->fd_lastfile; i-- >= 0; fpp++) {
|
|
if (*fpp)
|
|
(void) closef(*fpp, td);
|
|
}
|
|
if (fdp->fd_nfiles > NDFILE)
|
|
FREE(fdp->fd_ofiles, M_FILEDESC);
|
|
if (fdp->fd_cdir)
|
|
vrele(fdp->fd_cdir);
|
|
if (fdp->fd_rdir)
|
|
vrele(fdp->fd_rdir);
|
|
if (fdp->fd_jdir)
|
|
vrele(fdp->fd_jdir);
|
|
if (fdp->fd_knlist)
|
|
FREE(fdp->fd_knlist, M_KQUEUE);
|
|
if (fdp->fd_knhash)
|
|
FREE(fdp->fd_knhash, M_KQUEUE);
|
|
FREE(fdp, M_FILEDESC);
|
|
}
|
|
|
|
/*
|
|
* For setugid programs, we don't want to people to use that setugidness
|
|
* to generate error messages which write to a file which otherwise would
|
|
* otherwise be off-limits to the process.
|
|
*
|
|
* This is a gross hack to plug the hole. A better solution would involve
|
|
* a special vop or other form of generalized access control mechanism. We
|
|
* go ahead and just reject all procfs file systems accesses as dangerous.
|
|
*
|
|
* Since setugidsafety calls this only for fd 0, 1 and 2, this check is
|
|
* sufficient. We also don't for check setugidness since we know we are.
|
|
*/
|
|
static int
|
|
is_unsafe(struct file *fp)
|
|
{
|
|
if (fp->f_type == DTYPE_VNODE &&
|
|
((struct vnode *)(fp->f_data))->v_tag == VT_PROCFS)
|
|
return (1);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Make this setguid thing safe, if at all possible.
|
|
*/
|
|
void
|
|
setugidsafety(td)
|
|
struct thread *td;
|
|
{
|
|
struct filedesc *fdp = td->td_proc->p_fd;
|
|
register int i;
|
|
|
|
/* Certain daemons might not have file descriptors. */
|
|
if (fdp == NULL)
|
|
return;
|
|
|
|
/*
|
|
* note: fdp->fd_ofiles may be reallocated out from under us while
|
|
* we are blocked in a close. Be careful!
|
|
*/
|
|
for (i = 0; i <= fdp->fd_lastfile; i++) {
|
|
if (i > 2)
|
|
break;
|
|
if (fdp->fd_ofiles[i] && is_unsafe(fdp->fd_ofiles[i])) {
|
|
struct file *fp;
|
|
|
|
#if 0
|
|
if ((fdp->fd_ofileflags[i] & UF_MAPPED) != 0)
|
|
(void) munmapfd(td, i);
|
|
#endif
|
|
if (i < fdp->fd_knlistsize)
|
|
knote_fdclose(td, i);
|
|
/*
|
|
* NULL-out descriptor prior to close to avoid
|
|
* a race while close blocks.
|
|
*/
|
|
fp = fdp->fd_ofiles[i];
|
|
fdp->fd_ofiles[i] = NULL;
|
|
fdp->fd_ofileflags[i] = 0;
|
|
if (i < fdp->fd_freefile)
|
|
fdp->fd_freefile = i;
|
|
(void) closef(fp, td);
|
|
}
|
|
}
|
|
while (fdp->fd_lastfile > 0 && fdp->fd_ofiles[fdp->fd_lastfile] == NULL)
|
|
fdp->fd_lastfile--;
|
|
}
|
|
|
|
/*
|
|
* Close any files on exec?
|
|
*/
|
|
void
|
|
fdcloseexec(td)
|
|
struct thread *td;
|
|
{
|
|
struct filedesc *fdp = td->td_proc->p_fd;
|
|
register int i;
|
|
|
|
/* Certain daemons might not have file descriptors. */
|
|
if (fdp == NULL)
|
|
return;
|
|
|
|
/*
|
|
* We cannot cache fd_ofiles or fd_ofileflags since operations
|
|
* may block and rip them out from under us.
|
|
*/
|
|
for (i = 0; i <= fdp->fd_lastfile; i++) {
|
|
if (fdp->fd_ofiles[i] != NULL &&
|
|
(fdp->fd_ofileflags[i] & UF_EXCLOSE)) {
|
|
struct file *fp;
|
|
|
|
#if 0
|
|
if (fdp->fd_ofileflags[i] & UF_MAPPED)
|
|
(void) munmapfd(td, i);
|
|
#endif
|
|
if (i < fdp->fd_knlistsize)
|
|
knote_fdclose(td, i);
|
|
/*
|
|
* NULL-out descriptor prior to close to avoid
|
|
* a race while close blocks.
|
|
*/
|
|
fp = fdp->fd_ofiles[i];
|
|
fdp->fd_ofiles[i] = NULL;
|
|
fdp->fd_ofileflags[i] = 0;
|
|
if (i < fdp->fd_freefile)
|
|
fdp->fd_freefile = i;
|
|
(void) closef(fp, td);
|
|
}
|
|
}
|
|
while (fdp->fd_lastfile > 0 && fdp->fd_ofiles[fdp->fd_lastfile] == NULL)
|
|
fdp->fd_lastfile--;
|
|
}
|
|
|
|
/*
|
|
* Internal form of close.
|
|
* Decrement reference count on file structure.
|
|
* Note: td may be NULL when closing a file
|
|
* that was being passed in a message.
|
|
*/
|
|
int
|
|
closef(fp, td)
|
|
register struct file *fp;
|
|
register struct thread *td;
|
|
{
|
|
struct vnode *vp;
|
|
struct flock lf;
|
|
|
|
if (fp == NULL)
|
|
return (0);
|
|
/*
|
|
* POSIX record locking dictates that any close releases ALL
|
|
* locks owned by this process. This is handled by setting
|
|
* a flag in the unlock to free ONLY locks obeying POSIX
|
|
* semantics, and not to free BSD-style file locks.
|
|
* If the descriptor was in a message, POSIX-style locks
|
|
* aren't passed with the descriptor.
|
|
*/
|
|
if (td && (td->td_proc->p_flag & P_ADVLOCK) &&
|
|
fp->f_type == DTYPE_VNODE) {
|
|
lf.l_whence = SEEK_SET;
|
|
lf.l_start = 0;
|
|
lf.l_len = 0;
|
|
lf.l_type = F_UNLCK;
|
|
vp = (struct vnode *)fp->f_data;
|
|
(void) VOP_ADVLOCK(vp, (caddr_t)td->td_proc->p_leader,
|
|
F_UNLCK, &lf, F_POSIX);
|
|
}
|
|
return (fdrop(fp, td));
|
|
}
|
|
|
|
/*
|
|
* Extract the file pointer associated with the specified descriptor for
|
|
* the current user process. If no error occured 0 is returned, *fpp
|
|
* will be set to the file pointer, and the file pointer's ref count
|
|
* will be bumped. Use fdrop() to drop it. If an error occured the
|
|
* non-zero error is returned and *fpp is set to NULL.
|
|
*
|
|
* This routine requires Giant for the moment. Once enough of the
|
|
* system is converted over to this and other encapsulated APIs we
|
|
* will be able to mutex it and call it without Giant.
|
|
*/
|
|
static __inline
|
|
int
|
|
_fget(struct thread *td, int fd, struct file **fpp, int flags)
|
|
{
|
|
struct filedesc *fdp;
|
|
struct file *fp;
|
|
|
|
GIANT_REQUIRED;
|
|
fdp = td->td_proc->p_fd;
|
|
*fpp = NULL;
|
|
if ((u_int)fd >= fdp->fd_nfiles)
|
|
return(EBADF);
|
|
if ((fp = fdp->fd_ofiles[fd]) == NULL)
|
|
return(EBADF);
|
|
|
|
/*
|
|
* Note: FREAD failures returns EBADF to maintain backwards
|
|
* compatibility with what routines returned before.
|
|
*
|
|
* Only one flag, or 0, may be specified.
|
|
*/
|
|
if (flags == FREAD && (fp->f_flag & FREAD) == 0)
|
|
return(EBADF);
|
|
if (flags == FWRITE && (fp->f_flag & FWRITE) == 0)
|
|
return(EINVAL);
|
|
++fp->f_count;
|
|
*fpp = fp;
|
|
return(0);
|
|
}
|
|
|
|
int
|
|
fget(struct thread *td, int fd, struct file **fpp)
|
|
{
|
|
return(_fget(td, fd, fpp, 0));
|
|
}
|
|
|
|
int
|
|
fget_read(struct thread *td, int fd, struct file **fpp)
|
|
{
|
|
return(_fget(td, fd, fpp, FREAD));
|
|
}
|
|
|
|
int
|
|
fget_write(struct thread *td, int fd, struct file **fpp)
|
|
{
|
|
return(_fget(td, fd, fpp, FWRITE));
|
|
}
|
|
|
|
/*
|
|
* Like fget() but loads the underlying vnode, or returns an error if
|
|
* the descriptor does not represent a vnode. Note that pipes use vnodes
|
|
* but never have VM objects (so VOP_GETVOBJECT() calls will return an
|
|
* error). The returned vnode will be vref()d.
|
|
*/
|
|
|
|
static __inline
|
|
int
|
|
_fgetvp(struct thread *td, int fd, struct vnode **vpp, int flags)
|
|
{
|
|
struct filedesc *fdp;
|
|
struct file *fp;
|
|
|
|
GIANT_REQUIRED;
|
|
fdp = td->td_proc->p_fd;
|
|
*vpp = NULL;
|
|
if ((u_int)fd >= fdp->fd_nfiles)
|
|
return(EBADF);
|
|
if ((fp = fdp->fd_ofiles[fd]) == NULL)
|
|
return(EBADF);
|
|
if (fp->f_type != DTYPE_VNODE && fp->f_type != DTYPE_FIFO)
|
|
return(EINVAL);
|
|
if (fp->f_data == NULL)
|
|
return(EINVAL);
|
|
|
|
/*
|
|
* Note: FREAD failures returns EBADF to maintain backwards
|
|
* compatibility with what routines returned before.
|
|
*
|
|
* Only one flag, or 0, may be specified.
|
|
*/
|
|
if (flags == FREAD && (fp->f_flag & FREAD) == 0)
|
|
return(EBADF);
|
|
if (flags == FWRITE && (fp->f_flag & FWRITE) == 0)
|
|
return(EINVAL);
|
|
*vpp = (struct vnode *)fp->f_data;
|
|
vref(*vpp);
|
|
return(0);
|
|
}
|
|
|
|
int
|
|
fgetvp(struct thread *td, int fd, struct vnode **vpp)
|
|
{
|
|
return(_fgetvp(td, fd, vpp, 0));
|
|
}
|
|
|
|
int
|
|
fgetvp_read(struct thread *td, int fd, struct vnode **vpp)
|
|
{
|
|
return(_fgetvp(td, fd, vpp, FREAD));
|
|
}
|
|
|
|
int
|
|
fgetvp_write(struct thread *td, int fd, struct vnode **vpp)
|
|
{
|
|
return(_fgetvp(td, fd, vpp, FWRITE));
|
|
}
|
|
|
|
/*
|
|
* Like fget() but loads the underlying socket, or returns an error if
|
|
* the descriptor does not represent a socket.
|
|
*
|
|
* We bump the ref count on the returned socket. XXX Also obtain the SX lock in
|
|
* the future.
|
|
*/
|
|
int
|
|
fgetsock(struct thread *td, int fd, struct socket **spp, u_int *fflagp)
|
|
{
|
|
struct filedesc *fdp;
|
|
struct file *fp;
|
|
struct socket *so;
|
|
|
|
GIANT_REQUIRED;
|
|
fdp = td->td_proc->p_fd;
|
|
*spp = NULL;
|
|
if (fflagp)
|
|
*fflagp = 0;
|
|
if ((u_int)fd >= fdp->fd_nfiles)
|
|
return(EBADF);
|
|
if ((fp = fdp->fd_ofiles[fd]) == NULL)
|
|
return(EBADF);
|
|
if (fp->f_type != DTYPE_SOCKET)
|
|
return(ENOTSOCK);
|
|
if (fp->f_data == NULL)
|
|
return(EINVAL);
|
|
so = (struct socket *)fp->f_data;
|
|
if (fflagp)
|
|
*fflagp = fp->f_flag;
|
|
soref(so);
|
|
*spp = so;
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Drop the reference count on the the socket and XXX release the SX lock in
|
|
* the future. The last reference closes the socket.
|
|
*/
|
|
void
|
|
fputsock(struct socket *so)
|
|
{
|
|
sorele(so);
|
|
}
|
|
|
|
int
|
|
fdrop(fp, td)
|
|
struct file *fp;
|
|
struct thread *td;
|
|
{
|
|
struct flock lf;
|
|
struct vnode *vp;
|
|
int error;
|
|
|
|
if (--fp->f_count > 0)
|
|
return (0);
|
|
if (fp->f_count < 0)
|
|
panic("fdrop: count < 0");
|
|
if ((fp->f_flag & FHASLOCK) && fp->f_type == DTYPE_VNODE) {
|
|
lf.l_whence = SEEK_SET;
|
|
lf.l_start = 0;
|
|
lf.l_len = 0;
|
|
lf.l_type = F_UNLCK;
|
|
vp = (struct vnode *)fp->f_data;
|
|
(void) VOP_ADVLOCK(vp, (caddr_t)fp, F_UNLCK, &lf, F_FLOCK);
|
|
}
|
|
if (fp->f_ops != &badfileops)
|
|
error = fo_close(fp, td);
|
|
else
|
|
error = 0;
|
|
ffree(fp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Apply an advisory lock on a file descriptor.
|
|
*
|
|
* Just attempt to get a record lock of the requested type on
|
|
* the entire file (l_whence = SEEK_SET, l_start = 0, l_len = 0).
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct flock_args {
|
|
int fd;
|
|
int how;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
flock(td, uap)
|
|
struct thread *td;
|
|
register struct flock_args *uap;
|
|
{
|
|
register struct filedesc *fdp = td->td_proc->p_fd;
|
|
register struct file *fp;
|
|
struct vnode *vp;
|
|
struct flock lf;
|
|
int error;
|
|
|
|
mtx_lock(&Giant);
|
|
|
|
if ((unsigned)uap->fd >= fdp->fd_nfiles ||
|
|
(fp = fdp->fd_ofiles[uap->fd]) == NULL) {
|
|
error = EBADF;
|
|
goto done2;
|
|
}
|
|
if (fp->f_type != DTYPE_VNODE) {
|
|
error = EOPNOTSUPP;
|
|
goto done2;
|
|
}
|
|
vp = (struct vnode *)fp->f_data;
|
|
lf.l_whence = SEEK_SET;
|
|
lf.l_start = 0;
|
|
lf.l_len = 0;
|
|
if (uap->how & LOCK_UN) {
|
|
lf.l_type = F_UNLCK;
|
|
fp->f_flag &= ~FHASLOCK;
|
|
error = VOP_ADVLOCK(vp, (caddr_t)fp, F_UNLCK, &lf, F_FLOCK);
|
|
goto done2;
|
|
}
|
|
if (uap->how & LOCK_EX)
|
|
lf.l_type = F_WRLCK;
|
|
else if (uap->how & LOCK_SH)
|
|
lf.l_type = F_RDLCK;
|
|
else {
|
|
error = EBADF;
|
|
goto done2;
|
|
}
|
|
fp->f_flag |= FHASLOCK;
|
|
if (uap->how & LOCK_NB)
|
|
error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, F_FLOCK);
|
|
else
|
|
error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, F_FLOCK|F_WAIT);
|
|
done2:
|
|
mtx_unlock(&Giant);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* File Descriptor pseudo-device driver (/dev/fd/).
|
|
*
|
|
* Opening minor device N dup()s the file (if any) connected to file
|
|
* descriptor N belonging to the calling process. Note that this driver
|
|
* consists of only the ``open()'' routine, because all subsequent
|
|
* references to this file will be direct to the other driver.
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
fdopen(dev, mode, type, td)
|
|
dev_t dev;
|
|
int mode, type;
|
|
struct thread *td;
|
|
{
|
|
|
|
/*
|
|
* XXX Kludge: set curthread->td_dupfd to contain the value of the
|
|
* the file descriptor being sought for duplication. The error
|
|
* return ensures that the vnode for this device will be released
|
|
* by vn_open. Open will detect this special error and take the
|
|
* actions in dupfdopen below. Other callers of vn_open or VOP_OPEN
|
|
* will simply report the error.
|
|
*/
|
|
td->td_dupfd = dev2unit(dev);
|
|
return (ENODEV);
|
|
}
|
|
|
|
/*
|
|
* Duplicate the specified descriptor to a free descriptor.
|
|
*/
|
|
int
|
|
dupfdopen(td, fdp, indx, dfd, mode, error)
|
|
struct thread *td;
|
|
struct filedesc *fdp;
|
|
int indx, dfd;
|
|
int mode;
|
|
int error;
|
|
{
|
|
register struct file *wfp;
|
|
struct file *fp;
|
|
|
|
/*
|
|
* If the to-be-dup'd fd number is greater than the allowed number
|
|
* of file descriptors, or the fd to be dup'd has already been
|
|
* closed, then reject.
|
|
*/
|
|
if ((u_int)dfd >= fdp->fd_nfiles ||
|
|
(wfp = fdp->fd_ofiles[dfd]) == NULL) {
|
|
return (EBADF);
|
|
}
|
|
|
|
/*
|
|
* There are two cases of interest here.
|
|
*
|
|
* For ENODEV simply dup (dfd) to file descriptor
|
|
* (indx) and return.
|
|
*
|
|
* For ENXIO steal away the file structure from (dfd) and
|
|
* store it in (indx). (dfd) is effectively closed by
|
|
* this operation.
|
|
*
|
|
* Any other error code is just returned.
|
|
*/
|
|
switch (error) {
|
|
case ENODEV:
|
|
/*
|
|
* Check that the mode the file is being opened for is a
|
|
* subset of the mode of the existing descriptor.
|
|
*/
|
|
if (((mode & (FREAD|FWRITE)) | wfp->f_flag) != wfp->f_flag)
|
|
return (EACCES);
|
|
fp = fdp->fd_ofiles[indx];
|
|
#if 0
|
|
if (fp && fdp->fd_ofileflags[indx] & UF_MAPPED)
|
|
(void) munmapfd(td, indx);
|
|
#endif
|
|
fdp->fd_ofiles[indx] = wfp;
|
|
fdp->fd_ofileflags[indx] = fdp->fd_ofileflags[dfd];
|
|
fhold(wfp);
|
|
if (indx > fdp->fd_lastfile)
|
|
fdp->fd_lastfile = indx;
|
|
/*
|
|
* we now own the reference to fp that the ofiles[] array
|
|
* used to own. Release it.
|
|
*/
|
|
if (fp)
|
|
fdrop(fp, td);
|
|
return (0);
|
|
|
|
case ENXIO:
|
|
/*
|
|
* Steal away the file pointer from dfd, and stuff it into indx.
|
|
*/
|
|
fp = fdp->fd_ofiles[indx];
|
|
#if 0
|
|
if (fp && fdp->fd_ofileflags[indx] & UF_MAPPED)
|
|
(void) munmapfd(td, indx);
|
|
#endif
|
|
fdp->fd_ofiles[indx] = fdp->fd_ofiles[dfd];
|
|
fdp->fd_ofiles[dfd] = NULL;
|
|
fdp->fd_ofileflags[indx] = fdp->fd_ofileflags[dfd];
|
|
fdp->fd_ofileflags[dfd] = 0;
|
|
|
|
/*
|
|
* we now own the reference to fp that the ofiles[] array
|
|
* used to own. Release it.
|
|
*/
|
|
if (fp)
|
|
fdrop(fp, td);
|
|
/*
|
|
* Complete the clean up of the filedesc structure by
|
|
* recomputing the various hints.
|
|
*/
|
|
if (indx > fdp->fd_lastfile) {
|
|
fdp->fd_lastfile = indx;
|
|
} else {
|
|
while (fdp->fd_lastfile > 0 &&
|
|
fdp->fd_ofiles[fdp->fd_lastfile] == NULL) {
|
|
fdp->fd_lastfile--;
|
|
}
|
|
if (dfd < fdp->fd_freefile)
|
|
fdp->fd_freefile = dfd;
|
|
}
|
|
return (0);
|
|
|
|
default:
|
|
return (error);
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Get file structures.
|
|
*/
|
|
static int
|
|
sysctl_kern_file(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error;
|
|
struct file *fp;
|
|
|
|
if (!req->oldptr) {
|
|
/*
|
|
* overestimate by 10 files
|
|
*/
|
|
return (SYSCTL_OUT(req, 0, sizeof(filehead) +
|
|
(nfiles + 10) * sizeof(struct file)));
|
|
}
|
|
|
|
error = SYSCTL_OUT(req, (caddr_t)&filehead, sizeof(filehead));
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* followed by an array of file structures
|
|
*/
|
|
LIST_FOREACH(fp, &filehead, f_list) {
|
|
error = SYSCTL_OUT(req, (caddr_t)fp, sizeof (struct file));
|
|
if (error)
|
|
return (error);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
SYSCTL_PROC(_kern, KERN_FILE, file, CTLTYPE_OPAQUE|CTLFLAG_RD,
|
|
0, 0, sysctl_kern_file, "S,file", "Entire file table");
|
|
|
|
SYSCTL_INT(_kern, KERN_MAXFILESPERPROC, maxfilesperproc, CTLFLAG_RW,
|
|
&maxfilesperproc, 0, "Maximum files allowed open per process");
|
|
|
|
SYSCTL_INT(_kern, KERN_MAXFILES, maxfiles, CTLFLAG_RW,
|
|
&maxfiles, 0, "Maximum number of files");
|
|
|
|
SYSCTL_INT(_kern, OID_AUTO, openfiles, CTLFLAG_RD,
|
|
&nfiles, 0, "System-wide number of open files");
|
|
|
|
static void
|
|
fildesc_drvinit(void *unused)
|
|
{
|
|
dev_t dev;
|
|
|
|
dev = make_dev(&fildesc_cdevsw, 0, UID_BIN, GID_BIN, 0666, "fd/0");
|
|
make_dev_alias(dev, "stdin");
|
|
dev = make_dev(&fildesc_cdevsw, 1, UID_BIN, GID_BIN, 0666, "fd/1");
|
|
make_dev_alias(dev, "stdout");
|
|
dev = make_dev(&fildesc_cdevsw, 2, UID_BIN, GID_BIN, 0666, "fd/2");
|
|
make_dev_alias(dev, "stderr");
|
|
if (!devfs_present) {
|
|
int fd;
|
|
|
|
for (fd = 3; fd < NUMFDESC; fd++)
|
|
make_dev(&fildesc_cdevsw, fd, UID_BIN, GID_BIN, 0666,
|
|
"fd/%d", fd);
|
|
}
|
|
}
|
|
|
|
struct fileops badfileops = {
|
|
badfo_readwrite,
|
|
badfo_readwrite,
|
|
badfo_ioctl,
|
|
badfo_poll,
|
|
badfo_kqfilter,
|
|
badfo_stat,
|
|
badfo_close
|
|
};
|
|
|
|
static int
|
|
badfo_readwrite(fp, uio, cred, flags, td)
|
|
struct file *fp;
|
|
struct uio *uio;
|
|
struct ucred *cred;
|
|
struct thread *td;
|
|
int flags;
|
|
{
|
|
|
|
return (EBADF);
|
|
}
|
|
|
|
static int
|
|
badfo_ioctl(fp, com, data, td)
|
|
struct file *fp;
|
|
u_long com;
|
|
caddr_t data;
|
|
struct thread *td;
|
|
{
|
|
|
|
return (EBADF);
|
|
}
|
|
|
|
static int
|
|
badfo_poll(fp, events, cred, td)
|
|
struct file *fp;
|
|
int events;
|
|
struct ucred *cred;
|
|
struct thread *td;
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
badfo_kqfilter(fp, kn)
|
|
struct file *fp;
|
|
struct knote *kn;
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
badfo_stat(fp, sb, td)
|
|
struct file *fp;
|
|
struct stat *sb;
|
|
struct thread *td;
|
|
{
|
|
|
|
return (EBADF);
|
|
}
|
|
|
|
static int
|
|
badfo_close(fp, td)
|
|
struct file *fp;
|
|
struct thread *td;
|
|
{
|
|
|
|
return (EBADF);
|
|
}
|
|
|
|
SYSINIT(fildescdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,
|
|
fildesc_drvinit,NULL)
|