c3ddfa524d
uncleanly due to a lost connection, it would hang in closef() waiting for the usecount to go back to 1. An audit of FILE_USE() vs FILE_UNUSE() usage led me to discover some incorrect error-path code.. In sys_fcntl(), avoid leaking a file descriptor usecount in an error case of F_SETFL; don't return, instead go to "out" to clean up. I suspect that the F_SETFL would fail because vop_fcntl is not implemented in deadfs.
1350 lines
30 KiB
C
1350 lines
30 KiB
C
/* $NetBSD: kern_descrip.c,v 1.62 1999/12/08 18:53:56 sommerfeld Exp $ */
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|
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/*
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* Copyright (c) 1982, 1986, 1989, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_descrip.c 8.8 (Berkeley) 2/14/95
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*/
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|
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/filedesc.h>
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#include <sys/kernel.h>
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#include <sys/vnode.h>
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#include <sys/proc.h>
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#include <sys/file.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/stat.h>
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|
#include <sys/ioctl.h>
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#include <sys/fcntl.h>
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#include <sys/malloc.h>
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#include <sys/pool.h>
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|
#include <sys/syslog.h>
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|
#include <sys/unistd.h>
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#include <sys/resourcevar.h>
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|
#include <sys/conf.h>
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|
|
|
#include <sys/mount.h>
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|
#include <sys/syscallargs.h>
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|
|
|
#include <vm/vm.h>
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|
|
|
/*
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* Descriptor management.
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|
*/
|
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struct filelist filehead; /* head of list of open files */
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int nfiles; /* actual number of open files */
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struct pool file_pool; /* memory pool for file structures */
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struct pool cwdi_pool; /* memory pool for cwdinfo structures */
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|
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static __inline void fd_used __P((struct filedesc *, int));
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static __inline void fd_unused __P((struct filedesc *, int));
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int finishdup __P((struct proc *, int, int, register_t *));
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|
|
|
static __inline void
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|
fd_used(fdp, fd)
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register struct filedesc *fdp;
|
|
register int fd;
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|
{
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|
|
|
if (fd > fdp->fd_lastfile)
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fdp->fd_lastfile = fd;
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|
}
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|
|
|
static __inline void
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fd_unused(fdp, fd)
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register struct filedesc *fdp;
|
|
register int fd;
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{
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|
|
|
if (fd < fdp->fd_freefile)
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fdp->fd_freefile = fd;
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#ifdef DIAGNOSTIC
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if (fd > fdp->fd_lastfile)
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panic("fd_unused: fd_lastfile inconsistent");
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#endif
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if (fd == fdp->fd_lastfile) {
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do {
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fd--;
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} while (fd >= 0 && fdp->fd_ofiles[fd] == NULL);
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fdp->fd_lastfile = fd;
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}
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}
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|
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/*
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|
* System calls on descriptors.
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*/
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|
|
|
/*
|
|
* Duplicate a file descriptor.
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*/
|
|
/* ARGSUSED */
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int
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sys_dup(p, v, retval)
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|
struct proc *p;
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|
void *v;
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register_t *retval;
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|
{
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struct sys_dup_args /* {
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syscallarg(int) fd;
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} */ *uap = v;
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struct file *fp;
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register struct filedesc *fdp = p->p_fd;
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register int old = SCARG(uap, fd);
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int new;
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int error;
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if ((u_int)old >= fdp->fd_nfiles ||
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(fp = fdp->fd_ofiles[old]) == NULL ||
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(fp->f_iflags & FIF_WANTCLOSE) != 0)
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return (EBADF);
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FILE_USE(fp);
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if ((error = fdalloc(p, 0, &new)) != 0) {
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FILE_UNUSE(fp, p);
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return (error);
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}
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/* finishdup() will unuse the descriptors for us */
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return (finishdup(p, old, new, retval));
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}
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|
|
/*
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|
* Duplicate a file descriptor to a particular value.
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*/
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/* ARGSUSED */
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int
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sys_dup2(p, v, retval)
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|
struct proc *p;
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void *v;
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|
register_t *retval;
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|
{
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|
struct sys_dup2_args /* {
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syscallarg(int) from;
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syscallarg(int) to;
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} */ *uap = v;
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struct file *fp;
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register struct filedesc *fdp = p->p_fd;
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register int old = SCARG(uap, from), new = SCARG(uap, to);
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int i, error;
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if ((u_int)old >= fdp->fd_nfiles ||
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(fp = fdp->fd_ofiles[old]) == NULL ||
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(fp->f_iflags & FIF_WANTCLOSE) != 0 ||
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(u_int)new >= p->p_rlimit[RLIMIT_NOFILE].rlim_cur ||
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(u_int)new >= maxfiles)
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return (EBADF);
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if (old == new) {
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*retval = new;
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return (0);
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}
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FILE_USE(fp);
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if (new >= fdp->fd_nfiles) {
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if ((error = fdalloc(p, new, &i)) != 0) {
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FILE_UNUSE(fp, p);
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return (error);
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}
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if (new != i)
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panic("dup2: fdalloc");
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} else {
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(void) fdrelease(p, new);
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|
}
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|
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/* finishdup() will unuse the descriptors for us */
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return (finishdup(p, old, new, retval));
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}
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|
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int fcntl_forfs __P((int, struct proc *, int, void *));
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|
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/*
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* The file control system call.
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*/
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/* ARGSUSED */
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int
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sys_fcntl(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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|
register struct sys_fcntl_args /* {
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syscallarg(int) fd;
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syscallarg(int) cmd;
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syscallarg(void *) arg;
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} */ *uap = v;
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int fd = SCARG(uap, fd);
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register struct filedesc *fdp = p->p_fd;
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register struct file *fp;
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struct vnode *vp;
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int i, tmp, error = 0, flg = F_POSIX, cmd;
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struct flock fl;
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int newmin;
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if ((u_int)fd >= fdp->fd_nfiles ||
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(fp = fdp->fd_ofiles[fd]) == NULL ||
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(fp->f_iflags & FIF_WANTCLOSE) != 0)
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return (EBADF);
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FILE_USE(fp);
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cmd = SCARG(uap, cmd);
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if ((cmd & F_FSCTL)) {
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error = fcntl_forfs(fd, p, cmd, SCARG(uap, arg));
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|
goto out;
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|
}
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|
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switch (cmd) {
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case F_DUPFD:
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|
newmin = (long)SCARG(uap, arg);
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if ((u_int)newmin >= p->p_rlimit[RLIMIT_NOFILE].rlim_cur ||
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(u_int)newmin >= maxfiles) {
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error = EINVAL;
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|
goto out;
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|
}
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if ((error = fdalloc(p, newmin, &i)) != 0)
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goto out;
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|
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/* finishdup() will unuse the descriptors for us */
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|
return (finishdup(p, fd, i, retval));
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|
|
case F_GETFD:
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|
*retval = fdp->fd_ofileflags[fd] & UF_EXCLOSE ? 1 : 0;
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|
break;
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|
|
|
case F_SETFD:
|
|
if ((long)SCARG(uap, arg) & 1)
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|
fdp->fd_ofileflags[fd] |= UF_EXCLOSE;
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|
else
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|
fdp->fd_ofileflags[fd] &= ~UF_EXCLOSE;
|
|
break;
|
|
|
|
case F_GETFL:
|
|
*retval = OFLAGS(fp->f_flag);
|
|
break;
|
|
|
|
case F_SETFL:
|
|
tmp = FFLAGS((long)SCARG(uap, arg)) & FCNTLFLAGS;
|
|
error = (*fp->f_ops->fo_fcntl)(fp, F_SETFL, (caddr_t)&tmp, p);
|
|
if (error)
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|
goto out;
|
|
fp->f_flag &= ~FCNTLFLAGS;
|
|
fp->f_flag |= tmp;
|
|
tmp = fp->f_flag & FNONBLOCK;
|
|
error = (*fp->f_ops->fo_ioctl)(fp, FIONBIO, (caddr_t)&tmp, p);
|
|
if (error)
|
|
goto out;
|
|
tmp = fp->f_flag & FASYNC;
|
|
error = (*fp->f_ops->fo_ioctl)(fp, FIOASYNC, (caddr_t)&tmp, p);
|
|
if (error == 0)
|
|
goto out;
|
|
fp->f_flag &= ~FNONBLOCK;
|
|
tmp = 0;
|
|
(void) (*fp->f_ops->fo_ioctl)(fp, FIONBIO, (caddr_t)&tmp, p);
|
|
break;
|
|
|
|
case F_GETOWN:
|
|
if (fp->f_type == DTYPE_SOCKET) {
|
|
*retval = ((struct socket *)fp->f_data)->so_pgid;
|
|
goto out;
|
|
}
|
|
error = (*fp->f_ops->fo_ioctl)
|
|
(fp, TIOCGPGRP, (caddr_t)retval, p);
|
|
*retval = -*retval;
|
|
break;
|
|
|
|
case F_SETOWN:
|
|
if (fp->f_type == DTYPE_SOCKET) {
|
|
((struct socket *)fp->f_data)->so_pgid =
|
|
(long)SCARG(uap, arg);
|
|
goto out;
|
|
}
|
|
if ((long)SCARG(uap, arg) <= 0) {
|
|
SCARG(uap, arg) = (void *)(-(long)SCARG(uap, arg));
|
|
} else {
|
|
struct proc *p1 = pfind((long)SCARG(uap, arg));
|
|
if (p1 == 0) {
|
|
error = ESRCH;
|
|
goto out;
|
|
}
|
|
SCARG(uap, arg) = (void *)(long)p1->p_pgrp->pg_id;
|
|
}
|
|
error = (*fp->f_ops->fo_ioctl)
|
|
(fp, TIOCSPGRP, (caddr_t)&SCARG(uap, arg), p);
|
|
break;
|
|
|
|
case F_SETLKW:
|
|
flg |= F_WAIT;
|
|
/* Fall into F_SETLK */
|
|
|
|
case F_SETLK:
|
|
if (fp->f_type != DTYPE_VNODE) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
vp = (struct vnode *)fp->f_data;
|
|
/* Copy in the lock structure */
|
|
error = copyin((caddr_t)SCARG(uap, arg), (caddr_t)&fl,
|
|
sizeof(fl));
|
|
if (error)
|
|
goto out;
|
|
if (fl.l_whence == SEEK_CUR)
|
|
fl.l_start += fp->f_offset;
|
|
switch (fl.l_type) {
|
|
case F_RDLCK:
|
|
if ((fp->f_flag & FREAD) == 0) {
|
|
error = EBADF;
|
|
goto out;
|
|
}
|
|
p->p_flag |= P_ADVLOCK;
|
|
error = VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &fl, flg);
|
|
goto out;
|
|
|
|
case F_WRLCK:
|
|
if ((fp->f_flag & FWRITE) == 0) {
|
|
error = EBADF;
|
|
goto out;
|
|
}
|
|
p->p_flag |= P_ADVLOCK;
|
|
error = VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &fl, flg);
|
|
goto out;
|
|
|
|
case F_UNLCK:
|
|
error = VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &fl,
|
|
F_POSIX);
|
|
goto out;
|
|
|
|
default:
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
case F_GETLK:
|
|
if (fp->f_type != DTYPE_VNODE) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
vp = (struct vnode *)fp->f_data;
|
|
/* Copy in the lock structure */
|
|
error = copyin((caddr_t)SCARG(uap, arg), (caddr_t)&fl,
|
|
sizeof(fl));
|
|
if (error)
|
|
goto out;
|
|
if (fl.l_whence == SEEK_CUR)
|
|
fl.l_start += fp->f_offset;
|
|
if (fl.l_type != F_RDLCK &&
|
|
fl.l_type != F_WRLCK &&
|
|
fl.l_type != F_UNLCK) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
error = VOP_ADVLOCK(vp, (caddr_t)p, F_GETLK, &fl, F_POSIX);
|
|
if (error)
|
|
goto out;
|
|
error = copyout((caddr_t)&fl, (caddr_t)SCARG(uap, arg),
|
|
sizeof(fl));
|
|
break;
|
|
|
|
default:
|
|
error = EINVAL;
|
|
}
|
|
|
|
out:
|
|
FILE_UNUSE(fp, p);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Common code for dup, dup2, and fcntl(F_DUPFD).
|
|
*/
|
|
int
|
|
finishdup(p, old, new, retval)
|
|
struct proc *p;
|
|
int old, new;
|
|
register_t *retval;
|
|
{
|
|
struct filedesc *fdp = p->p_fd;
|
|
struct file *fp;
|
|
|
|
/*
|
|
* Note: `old' is already used for us.
|
|
*/
|
|
|
|
fp = fdp->fd_ofiles[old];
|
|
fdp->fd_ofiles[new] = fp;
|
|
fdp->fd_ofileflags[new] = fdp->fd_ofileflags[old] &~ UF_EXCLOSE;
|
|
fp->f_count++;
|
|
fd_used(fdp, new);
|
|
*retval = new;
|
|
FILE_UNUSE(fp, p);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
fdrelease(p, fd)
|
|
struct proc *p;
|
|
int fd;
|
|
{
|
|
register struct filedesc *fdp = p->p_fd;
|
|
register struct file **fpp, *fp;
|
|
register char *pf;
|
|
|
|
fpp = &fdp->fd_ofiles[fd];
|
|
fp = *fpp;
|
|
if (fp == NULL)
|
|
return (EBADF);
|
|
|
|
FILE_USE(fp);
|
|
|
|
pf = &fdp->fd_ofileflags[fd];
|
|
if (*pf & UF_MAPPED) {
|
|
/* XXX: USELESS? XXXCDC check it */
|
|
p->p_fd->fd_ofileflags[fd] &= ~UF_MAPPED;
|
|
}
|
|
*fpp = NULL;
|
|
*pf = 0;
|
|
fd_unused(fdp, fd);
|
|
return (closef(fp, p));
|
|
}
|
|
|
|
/*
|
|
* Close a file descriptor.
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
sys_close(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct sys_close_args /* {
|
|
syscallarg(int) fd;
|
|
} */ *uap = v;
|
|
int fd = SCARG(uap, fd);
|
|
register struct filedesc *fdp = p->p_fd;
|
|
|
|
if ((u_int)fd >= fdp->fd_nfiles)
|
|
return (EBADF);
|
|
return (fdrelease(p, fd));
|
|
}
|
|
|
|
/*
|
|
* Return status information about a file descriptor.
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
sys___fstat13(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
register struct sys___fstat13_args /* {
|
|
syscallarg(int) fd;
|
|
syscallarg(struct stat *) sb;
|
|
} */ *uap = v;
|
|
int fd = SCARG(uap, fd);
|
|
register struct filedesc *fdp = p->p_fd;
|
|
register struct file *fp;
|
|
struct stat ub;
|
|
int error;
|
|
|
|
if ((u_int)fd >= fdp->fd_nfiles ||
|
|
(fp = fdp->fd_ofiles[fd]) == NULL ||
|
|
(fp->f_iflags & FIF_WANTCLOSE) != 0)
|
|
return (EBADF);
|
|
|
|
FILE_USE(fp);
|
|
|
|
switch (fp->f_type) {
|
|
|
|
case DTYPE_VNODE:
|
|
error = vn_stat((struct vnode *)fp->f_data, &ub, p);
|
|
break;
|
|
|
|
case DTYPE_SOCKET:
|
|
error = soo_stat((struct socket *)fp->f_data, &ub);
|
|
break;
|
|
|
|
default:
|
|
panic("fstat");
|
|
/*NOTREACHED*/
|
|
}
|
|
if (error == 0)
|
|
error = copyout(&ub, SCARG(uap, sb), sizeof(ub));
|
|
FILE_UNUSE(fp, p);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Return pathconf information about a file descriptor.
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
sys_fpathconf(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
register struct sys_fpathconf_args /* {
|
|
syscallarg(int) fd;
|
|
syscallarg(int) name;
|
|
} */ *uap = v;
|
|
int fd = SCARG(uap, fd);
|
|
struct filedesc *fdp = p->p_fd;
|
|
struct file *fp;
|
|
struct vnode *vp;
|
|
int error = 0;
|
|
|
|
if ((u_int)fd >= fdp->fd_nfiles ||
|
|
(fp = fdp->fd_ofiles[fd]) == NULL ||
|
|
(fp->f_iflags & FIF_WANTCLOSE) != 0)
|
|
return (EBADF);
|
|
|
|
FILE_USE(fp);
|
|
|
|
switch (fp->f_type) {
|
|
|
|
case DTYPE_SOCKET:
|
|
if (SCARG(uap, name) != _PC_PIPE_BUF)
|
|
error = EINVAL;
|
|
else
|
|
*retval = PIPE_BUF;
|
|
break;
|
|
|
|
case DTYPE_VNODE:
|
|
vp = (struct vnode *)fp->f_data;
|
|
error = VOP_PATHCONF(vp, SCARG(uap, name), retval);
|
|
break;
|
|
|
|
default:
|
|
panic("fpathconf");
|
|
}
|
|
|
|
FILE_UNUSE(fp, p);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Allocate a file descriptor for the process.
|
|
*/
|
|
int fdexpand;
|
|
|
|
int
|
|
fdalloc(p, want, result)
|
|
struct proc *p;
|
|
int want;
|
|
int *result;
|
|
{
|
|
register struct filedesc *fdp = p->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, maxfiles);
|
|
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) {
|
|
fd_used(fdp, 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);
|
|
newofileflags = (char *) &newofile[nfiles];
|
|
/*
|
|
* Copy the existing ofile and ofileflags arrays
|
|
* and zero the new portion of each array.
|
|
*/
|
|
memcpy(newofile, fdp->fd_ofiles,
|
|
(i = sizeof(struct file *) * fdp->fd_nfiles));
|
|
memset((char *)newofile + i, 0, nfiles * sizeof(struct file *) - i);
|
|
memcpy(newofileflags, fdp->fd_ofileflags,
|
|
(i = sizeof(char) * fdp->fd_nfiles));
|
|
memset(newofileflags + i, 0, 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++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check to see whether n user file descriptors
|
|
* are available to the process p.
|
|
*/
|
|
int
|
|
fdavail(p, n)
|
|
struct proc *p;
|
|
register int n;
|
|
{
|
|
register struct filedesc *fdp = p->p_fd;
|
|
register struct file **fpp;
|
|
register int i, lim;
|
|
|
|
lim = min((int)p->p_rlimit[RLIMIT_NOFILE].rlim_cur, maxfiles);
|
|
if ((i = lim - fdp->fd_nfiles) > 0 && (n -= i) <= 0)
|
|
return (1);
|
|
fpp = &fdp->fd_ofiles[fdp->fd_freefile];
|
|
for (i = min(lim,fdp->fd_nfiles) - fdp->fd_freefile; --i >= 0; fpp++)
|
|
if (*fpp == NULL && --n <= 0)
|
|
return (1);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Initialize the data structures necessary for managing files.
|
|
*/
|
|
void
|
|
finit()
|
|
{
|
|
|
|
pool_init(&file_pool, sizeof(struct file), 0, 0, 0, "filepl",
|
|
0, pool_page_alloc_nointr, pool_page_free_nointr, M_FILE);
|
|
pool_init(&cwdi_pool, sizeof(struct cwdinfo), 0, 0, 0, "cwdipl",
|
|
0, pool_page_alloc_nointr, pool_page_free_nointr, M_FILEDESC);
|
|
}
|
|
|
|
/*
|
|
* Create a new open file structure and allocate
|
|
* a file decriptor for the process that refers to it.
|
|
*/
|
|
int
|
|
falloc(p, resultfp, resultfd)
|
|
register struct proc *p;
|
|
struct file **resultfp;
|
|
int *resultfd;
|
|
{
|
|
register struct file *fp, *fq;
|
|
int error, i;
|
|
|
|
if ((error = fdalloc(p, 0, &i)) != 0)
|
|
return (error);
|
|
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++;
|
|
fp = pool_get(&file_pool, PR_WAITOK);
|
|
memset(fp, 0, sizeof(struct file));
|
|
if ((fq = p->p_fd->fd_ofiles[0]) != NULL) {
|
|
LIST_INSERT_AFTER(fq, fp, f_list);
|
|
} else {
|
|
LIST_INSERT_HEAD(&filehead, fp, f_list);
|
|
}
|
|
p->p_fd->fd_ofiles[i] = fp;
|
|
fp->f_count = 1;
|
|
fp->f_cred = p->p_ucred;
|
|
crhold(fp->f_cred);
|
|
if (resultfp) {
|
|
FILE_USE(fp);
|
|
*resultfp = fp;
|
|
}
|
|
if (resultfd)
|
|
*resultfd = i;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Free a file descriptor.
|
|
*/
|
|
void
|
|
ffree(fp)
|
|
register struct file *fp;
|
|
{
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (fp->f_usecount)
|
|
panic("ffree");
|
|
#endif
|
|
|
|
LIST_REMOVE(fp, f_list);
|
|
crfree(fp->f_cred);
|
|
#ifdef DIAGNOSTIC
|
|
fp->f_count = 0;
|
|
#endif
|
|
nfiles--;
|
|
pool_put(&file_pool, fp);
|
|
}
|
|
|
|
/*
|
|
* Create an initial cwdinfo structure, using the same current and root
|
|
* directories as p.
|
|
*/
|
|
struct cwdinfo *
|
|
cwdinit(p)
|
|
struct proc *p;
|
|
{
|
|
struct cwdinfo *cwdi;
|
|
|
|
cwdi = pool_get(&cwdi_pool, PR_WAITOK);
|
|
|
|
cwdi->cwdi_cdir = p->p_cwdi->cwdi_cdir;
|
|
VREF(cwdi->cwdi_cdir);
|
|
cwdi->cwdi_rdir = p->p_cwdi->cwdi_rdir;
|
|
if (cwdi->cwdi_rdir)
|
|
VREF(cwdi->cwdi_rdir);
|
|
cwdi->cwdi_cmask = p->p_cwdi->cwdi_cmask;
|
|
cwdi->cwdi_refcnt = 1;
|
|
|
|
return (cwdi);
|
|
}
|
|
|
|
/*
|
|
* Make p2 share p1's cwdinfo.
|
|
*/
|
|
void
|
|
cwdshare(p1, p2)
|
|
struct proc *p1, *p2;
|
|
{
|
|
|
|
p2->p_cwdi = p1->p_cwdi;
|
|
p1->p_cwdi->cwdi_refcnt++;
|
|
}
|
|
|
|
/*
|
|
* Make this process not share its cwdinfo structure, maintaining
|
|
* all cwdinfo state.
|
|
*/
|
|
void
|
|
cwdunshare(p)
|
|
struct proc *p;
|
|
{
|
|
struct cwdinfo *newcwdi;
|
|
|
|
if (p->p_cwdi->cwdi_refcnt == 1)
|
|
return;
|
|
|
|
newcwdi = cwdinit(p);
|
|
cwdfree(p);
|
|
p->p_cwdi = newcwdi;
|
|
}
|
|
|
|
/*
|
|
* Release a cwdinfo structure.
|
|
*/
|
|
void
|
|
cwdfree(p)
|
|
struct proc *p;
|
|
{
|
|
struct cwdinfo *cwdi = p->p_cwdi;
|
|
|
|
if (--cwdi->cwdi_refcnt > 0)
|
|
return;
|
|
|
|
p->p_cwdi = NULL;
|
|
|
|
vrele(cwdi->cwdi_cdir);
|
|
if (cwdi->cwdi_rdir)
|
|
vrele(cwdi->cwdi_rdir);
|
|
pool_put(&cwdi_pool, cwdi);
|
|
}
|
|
|
|
/*
|
|
* Create an initial filedesc structure, using the same current and root
|
|
* directories as p.
|
|
*/
|
|
struct filedesc *
|
|
fdinit(p)
|
|
struct proc *p;
|
|
{
|
|
struct filedesc0 *newfdp;
|
|
|
|
MALLOC(newfdp, struct filedesc0 *, sizeof(struct filedesc0),
|
|
M_FILEDESC, M_WAITOK);
|
|
memset(newfdp, 0, sizeof(struct filedesc0));
|
|
|
|
fdinit1(newfdp);
|
|
|
|
return (&newfdp->fd_fd);
|
|
}
|
|
|
|
/*
|
|
* Initialize a file descriptor table.
|
|
*/
|
|
void
|
|
fdinit1(newfdp)
|
|
struct filedesc0 *newfdp;
|
|
{
|
|
|
|
newfdp->fd_fd.fd_refcnt = 1;
|
|
newfdp->fd_fd.fd_ofiles = newfdp->fd_dfiles;
|
|
newfdp->fd_fd.fd_ofileflags = newfdp->fd_dfileflags;
|
|
newfdp->fd_fd.fd_nfiles = NDFILE;
|
|
}
|
|
|
|
/*
|
|
* Make p2 share p1's filedesc structure.
|
|
*/
|
|
void
|
|
fdshare(p1, p2)
|
|
struct proc *p1, *p2;
|
|
{
|
|
|
|
p2->p_fd = p1->p_fd;
|
|
p1->p_fd->fd_refcnt++;
|
|
}
|
|
|
|
/*
|
|
* Make this process not share its filedesc structure, maintaining
|
|
* all file descriptor state.
|
|
*/
|
|
void
|
|
fdunshare(p)
|
|
struct proc *p;
|
|
{
|
|
struct filedesc *newfd;
|
|
|
|
if (p->p_fd->fd_refcnt == 1)
|
|
return;
|
|
|
|
newfd = fdcopy(p);
|
|
fdfree(p);
|
|
p->p_fd = newfd;
|
|
}
|
|
|
|
/*
|
|
* Clear a process's fd table.
|
|
*/
|
|
void
|
|
fdclear(p)
|
|
struct proc *p;
|
|
{
|
|
struct filedesc *newfd;
|
|
|
|
newfd = fdinit(p);
|
|
fdfree(p);
|
|
p->p_fd = newfd;
|
|
}
|
|
|
|
/*
|
|
* Copy a filedesc structure.
|
|
*/
|
|
struct filedesc *
|
|
fdcopy(p)
|
|
struct proc *p;
|
|
{
|
|
register struct filedesc *newfdp, *fdp = p->p_fd;
|
|
register struct file **fpp;
|
|
register int i;
|
|
|
|
MALLOC(newfdp, struct filedesc *, sizeof(struct filedesc0),
|
|
M_FILEDESC, M_WAITOK);
|
|
memcpy(newfdp, fdp, sizeof(struct filedesc));
|
|
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;
|
|
memcpy(newfdp->fd_ofiles, fdp->fd_ofiles, i * sizeof(struct file **));
|
|
memcpy(newfdp->fd_ofileflags, fdp->fd_ofileflags, i * sizeof(char));
|
|
fpp = newfdp->fd_ofiles;
|
|
for (i = newfdp->fd_lastfile; i >= 0; i--, fpp++)
|
|
if (*fpp != NULL)
|
|
(*fpp)->f_count++;
|
|
return (newfdp);
|
|
}
|
|
|
|
/*
|
|
* Release a filedesc structure.
|
|
*/
|
|
void
|
|
fdfree(p)
|
|
struct proc *p;
|
|
{
|
|
register struct filedesc *fdp = p->p_fd;
|
|
register struct file **fpp, *fp;
|
|
register int i;
|
|
|
|
if (--fdp->fd_refcnt > 0)
|
|
return;
|
|
fpp = fdp->fd_ofiles;
|
|
for (i = fdp->fd_lastfile; i >= 0; i--, fpp++) {
|
|
fp = *fpp;
|
|
if (fp != NULL) {
|
|
*fpp = NULL;
|
|
FILE_USE(fp);
|
|
(void) closef(fp, p);
|
|
}
|
|
}
|
|
p->p_fd = NULL;
|
|
if (fdp->fd_nfiles > NDFILE)
|
|
FREE(fdp->fd_ofiles, M_FILEDESC);
|
|
FREE(fdp, M_FILEDESC);
|
|
}
|
|
|
|
/*
|
|
* Internal form of close.
|
|
* Decrement reference count on file structure.
|
|
* Note: p may be NULL when closing a file
|
|
* that was being passed in a message.
|
|
*
|
|
* Note: we expect the caller is holding a usecount, and expects us
|
|
* to drop it (the caller thinks the file is going away forever).
|
|
*/
|
|
int
|
|
closef(fp, p)
|
|
register struct file *fp;
|
|
register struct proc *p;
|
|
{
|
|
struct vnode *vp;
|
|
struct flock lf;
|
|
int error;
|
|
|
|
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 (p && (p->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)p, F_UNLCK, &lf, F_POSIX);
|
|
}
|
|
|
|
/*
|
|
* If WANTCLOSE is set, then the reference count on the file
|
|
* is 0, but there were multiple users of the file. This can
|
|
* happen if a filedesc structure is shared by multiple
|
|
* processes.
|
|
*/
|
|
if (fp->f_iflags & FIF_WANTCLOSE) {
|
|
/*
|
|
* Another user of the file is already closing, and is
|
|
* simply waiting for other users of the file to drain.
|
|
* Release our usecount, and wake up the closer if it
|
|
* is the only remaining use.
|
|
*/
|
|
#ifdef DIAGNOSTIC
|
|
if (fp->f_count != 0)
|
|
panic("closef: wantclose and count != 0");
|
|
if (fp->f_usecount < 2)
|
|
panic("closef: wantclose and usecount < 2");
|
|
#endif
|
|
if (--fp->f_usecount == 1)
|
|
wakeup(&fp->f_usecount);
|
|
return (0);
|
|
} else {
|
|
/*
|
|
* Decrement the reference count. If we were not the
|
|
* last reference, then release our use and just
|
|
* return.
|
|
*/
|
|
if (--fp->f_count > 0) {
|
|
#ifdef DIAGNOSTIC
|
|
if (fp->f_usecount < 1)
|
|
panic("closef: no wantclose and usecount < 1");
|
|
#endif
|
|
fp->f_usecount--;
|
|
return (0);
|
|
}
|
|
if (fp->f_count < 0)
|
|
panic("closef: count < 0");
|
|
}
|
|
|
|
/*
|
|
* The reference count is now 0. However, there may be
|
|
* multiple potential users of this file. This can happen
|
|
* if multiple processes shared a single filedesc structure.
|
|
*
|
|
* Notify these potential users that the file is closing.
|
|
* This will prevent them from adding additional uses to
|
|
* the file.
|
|
*/
|
|
fp->f_iflags |= FIF_WANTCLOSE;
|
|
|
|
/*
|
|
* We expect the caller to add a use to the file. So, if we
|
|
* are the last user, usecount will be 1. If it is not, we
|
|
* must wait for the usecount to drain. When it drains back
|
|
* to 1, we will be awakened so that we may proceed with the
|
|
* close.
|
|
*/
|
|
#ifdef DIAGNOSTIC
|
|
if (fp->f_usecount < 1)
|
|
panic("closef: usecount < 1");
|
|
#endif
|
|
while (fp->f_usecount > 1)
|
|
(void) tsleep(&fp->f_usecount, PRIBIO, "closef", 0);
|
|
#ifdef DIAGNOSTIC
|
|
if (fp->f_usecount != 1)
|
|
panic("closef: usecount != 1");
|
|
#endif
|
|
|
|
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)
|
|
error = (*fp->f_ops->fo_close)(fp, p);
|
|
else
|
|
error = 0;
|
|
|
|
/* Nothing references the file now, drop the final use (us). */
|
|
fp->f_usecount--;
|
|
|
|
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).
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
sys_flock(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
register struct sys_flock_args /* {
|
|
syscallarg(int) fd;
|
|
syscallarg(int) how;
|
|
} */ *uap = v;
|
|
int fd = SCARG(uap, fd);
|
|
int how = SCARG(uap, how);
|
|
register struct filedesc *fdp = p->p_fd;
|
|
register struct file *fp;
|
|
struct vnode *vp;
|
|
struct flock lf;
|
|
int error = 0;
|
|
|
|
if ((u_int)fd >= fdp->fd_nfiles ||
|
|
(fp = fdp->fd_ofiles[fd]) == NULL ||
|
|
(fp->f_iflags & FIF_WANTCLOSE) != 0)
|
|
return (EBADF);
|
|
|
|
FILE_USE(fp);
|
|
|
|
if (fp->f_type != DTYPE_VNODE) {
|
|
error = EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
vp = (struct vnode *)fp->f_data;
|
|
lf.l_whence = SEEK_SET;
|
|
lf.l_start = 0;
|
|
lf.l_len = 0;
|
|
if (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 out;
|
|
}
|
|
if (how & LOCK_EX)
|
|
lf.l_type = F_WRLCK;
|
|
else if (how & LOCK_SH)
|
|
lf.l_type = F_RDLCK;
|
|
else {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
fp->f_flag |= FHASLOCK;
|
|
if (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);
|
|
out:
|
|
FILE_UNUSE(fp, p);
|
|
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 */
|
|
int
|
|
filedescopen(dev, mode, type, p)
|
|
dev_t dev;
|
|
int mode, type;
|
|
struct proc *p;
|
|
{
|
|
|
|
/*
|
|
* XXX Kludge: set curproc->p_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.
|
|
*/
|
|
p->p_dupfd = minor(dev);
|
|
return (ENODEV);
|
|
}
|
|
|
|
/*
|
|
* Duplicate the specified descriptor to a free descriptor.
|
|
*/
|
|
int
|
|
dupfdopen(p, indx, dfd, mode, error)
|
|
struct proc *p;
|
|
int indx, dfd, mode, error;
|
|
{
|
|
struct filedesc *fdp = p->p_fd;
|
|
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, reject. Note, check for new == old is necessary as
|
|
* falloc could allocate an already closed to-be-dup'd descriptor
|
|
* as the new descriptor.
|
|
*/
|
|
fp = fdp->fd_ofiles[indx];
|
|
if ((u_int)dfd >= fdp->fd_nfiles ||
|
|
(wfp = fdp->fd_ofiles[dfd]) == NULL ||
|
|
(wfp->f_iflags & FIF_WANTCLOSE) != 0 ||
|
|
fp == wfp)
|
|
return (EBADF);
|
|
|
|
FILE_USE(wfp);
|
|
|
|
/*
|
|
* 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) {
|
|
FILE_UNUSE(wfp, p);
|
|
return (EACCES);
|
|
}
|
|
fdp->fd_ofiles[indx] = wfp;
|
|
fdp->fd_ofileflags[indx] = fdp->fd_ofileflags[dfd];
|
|
wfp->f_count++;
|
|
fd_used(fdp, indx);
|
|
FILE_UNUSE(wfp, p);
|
|
return (0);
|
|
|
|
case ENXIO:
|
|
/*
|
|
* Steal away the file pointer from dfd, and stuff it into indx.
|
|
*/
|
|
fdp->fd_ofiles[indx] = fdp->fd_ofiles[dfd];
|
|
fdp->fd_ofileflags[indx] = fdp->fd_ofileflags[dfd];
|
|
fdp->fd_ofiles[dfd] = NULL;
|
|
fdp->fd_ofileflags[dfd] = 0;
|
|
/*
|
|
* Complete the clean up of the filedesc structure by
|
|
* recomputing the various hints.
|
|
*/
|
|
fd_used(fdp, indx);
|
|
fd_unused(fdp, dfd);
|
|
FILE_UNUSE(wfp, p);
|
|
return (0);
|
|
|
|
default:
|
|
FILE_UNUSE(wfp, p);
|
|
return (error);
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* fcntl call which is being passed to the file's fs.
|
|
*/
|
|
int
|
|
fcntl_forfs(fd, p, cmd, arg)
|
|
int fd, cmd;
|
|
struct proc *p;
|
|
void *arg;
|
|
{
|
|
register struct file *fp;
|
|
register struct filedesc *fdp;
|
|
register int error;
|
|
register u_int size;
|
|
caddr_t data, memp;
|
|
#define STK_PARAMS 128
|
|
char stkbuf[STK_PARAMS];
|
|
|
|
/* fd's value was validated in sys_fcntl before calling this routine */
|
|
fdp = p->p_fd;
|
|
fp = fdp->fd_ofiles[fd];
|
|
|
|
if ((fp->f_flag & (FREAD | FWRITE)) == 0)
|
|
return (EBADF);
|
|
|
|
/*
|
|
* Interpret high order word to find amount of data to be
|
|
* copied to/from the user's address space.
|
|
*/
|
|
size = (size_t)F_PARAM_LEN(cmd);
|
|
if (size > F_PARAM_MAX)
|
|
return (EINVAL);
|
|
memp = NULL;
|
|
if (size > sizeof(stkbuf)) {
|
|
memp = (caddr_t)malloc((u_long)size, M_IOCTLOPS, M_WAITOK);
|
|
data = memp;
|
|
} else
|
|
data = stkbuf;
|
|
if (cmd & F_FSIN) {
|
|
if (size) {
|
|
error = copyin(arg, data, size);
|
|
if (error) {
|
|
if (memp)
|
|
free(memp, M_IOCTLOPS);
|
|
return (error);
|
|
}
|
|
} else
|
|
*(caddr_t *)data = arg;
|
|
} else if ((cmd & F_FSOUT) && size)
|
|
/*
|
|
* Zero the buffer so the user always
|
|
* gets back something deterministic.
|
|
*/
|
|
memset(data, 0, size);
|
|
else if (cmd & F_FSVOID)
|
|
*(caddr_t *)data = arg;
|
|
|
|
|
|
error = (*fp->f_ops->fo_fcntl)(fp, cmd, data, p);
|
|
|
|
/*
|
|
* Copy any data to user, size was
|
|
* already set and checked above.
|
|
*/
|
|
if (error == 0 && (cmd & F_FSOUT) && size)
|
|
error = copyout(data, arg, size);
|
|
if (memp)
|
|
free(memp, M_IOCTLOPS);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Close any files on exec?
|
|
*/
|
|
void
|
|
fdcloseexec(p)
|
|
struct proc *p;
|
|
{
|
|
register struct filedesc *fdp = p->p_fd;
|
|
register int fd;
|
|
|
|
for (fd = 0; fd <= fdp->fd_lastfile; fd++)
|
|
if (fdp->fd_ofileflags[fd] & UF_EXCLOSE)
|
|
(void) fdrelease(p, fd);
|
|
}
|