1314 lines
30 KiB
C
1314 lines
30 KiB
C
/*
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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 8.6 (Berkeley) 4/19/94
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* $Id: kern_descrip.c,v 1.56 1998/11/11 10:03:54 truckman Exp $
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*/
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#include "opt_compat.h"
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#include "opt_devfs.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/conf.h>
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#include <sys/filedesc.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.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/socketvar.h>
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#include <sys/stat.h>
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#include <sys/filio.h>
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#include <sys/ttycom.h>
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#include <sys/fcntl.h>
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#include <sys/malloc.h>
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#include <sys/unistd.h>
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#include <sys/resourcevar.h>
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#include <sys/pipe.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#ifdef DEVFS
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#include <sys/devfsext.h>
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#endif /*DEVFS*/
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static MALLOC_DEFINE(M_FILEDESC, "file desc", "Open file descriptor table");
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MALLOC_DEFINE(M_FILE, "file", "Open file structure");
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static MALLOC_DEFINE(M_SIGIO, "sigio", "sigio structures");
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static d_open_t fdopen;
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#define NUMFDESC 64
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#define CDEV_MAJOR 22
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static struct cdevsw fildesc_cdevsw =
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{ fdopen, noclose, noread, nowrite,
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noioc, nostop, nullreset, nodevtotty,
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seltrue, nommap, nostrat };
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static int finishdup __P((struct filedesc *fdp, int old, int new, register_t *retval));
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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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extern int cmask;
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/*
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* System calls on descriptors.
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct getdtablesize_args {
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int dummy;
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};
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#endif
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/* ARGSUSED */
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int
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getdtablesize(p, uap)
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struct proc *p;
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struct getdtablesize_args *uap;
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{
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p->p_retval[0] =
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min((int)p->p_rlimit[RLIMIT_NOFILE].rlim_cur, maxfilesperproc);
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return (0);
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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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#ifndef _SYS_SYSPROTO_H_
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struct dup2_args {
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u_int from;
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u_int to;
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};
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#endif
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/* ARGSUSED */
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int
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dup2(p, uap)
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struct proc *p;
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struct dup2_args *uap;
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{
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register struct filedesc *fdp = p->p_fd;
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register u_int old = uap->from, new = uap->to;
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int i, error;
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if (old >= fdp->fd_nfiles ||
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fdp->fd_ofiles[old] == NULL ||
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new >= p->p_rlimit[RLIMIT_NOFILE].rlim_cur ||
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new >= maxfilesperproc)
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return (EBADF);
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if (old == new) {
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p->p_retval[0] = new;
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return (0);
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}
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if (new >= fdp->fd_nfiles) {
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if ((error = fdalloc(p, new, &i)))
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return (error);
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if (new != i)
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panic("dup2: fdalloc");
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} else if (fdp->fd_ofiles[new]) {
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if (fdp->fd_ofileflags[new] & UF_MAPPED)
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(void) munmapfd(p, new);
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/*
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* dup2() must succeed even if the close has an error.
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*/
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(void) closef(fdp->fd_ofiles[new], p);
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}
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return (finishdup(fdp, (int)old, (int)new, p->p_retval));
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}
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/*
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* Duplicate a file descriptor.
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct dup_args {
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u_int fd;
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};
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#endif
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/* ARGSUSED */
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int
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dup(p, uap)
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struct proc *p;
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struct dup_args *uap;
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{
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register struct filedesc *fdp;
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u_int old;
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int new, error;
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old = uap->fd;
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#if 0
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/*
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* XXX Compatibility
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*/
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if (old &~ 077) { uap->fd &= 077; return (dup2(p, uap, p->p_retval)); }
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#endif
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fdp = p->p_fd;
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if (old >= fdp->fd_nfiles || fdp->fd_ofiles[old] == NULL)
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return (EBADF);
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if ((error = fdalloc(p, 0, &new)))
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return (error);
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return (finishdup(fdp, (int)old, new, p->p_retval));
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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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#ifndef _SYS_SYSPROTO_H_
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struct fcntl_args {
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int fd;
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int cmd;
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long arg;
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};
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#endif
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/* ARGSUSED */
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int
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fcntl(p, uap)
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struct proc *p;
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register struct fcntl_args *uap;
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{
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register struct filedesc *fdp = p->p_fd;
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register struct file *fp;
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register char *pop;
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struct vnode *vp;
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int i, tmp, error, flg = F_POSIX;
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struct flock fl;
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u_int newmin;
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if ((unsigned)uap->fd >= fdp->fd_nfiles ||
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(fp = fdp->fd_ofiles[uap->fd]) == NULL)
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return (EBADF);
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pop = &fdp->fd_ofileflags[uap->fd];
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switch (uap->cmd) {
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case F_DUPFD:
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newmin = uap->arg;
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if (newmin >= p->p_rlimit[RLIMIT_NOFILE].rlim_cur ||
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newmin >= maxfilesperproc)
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return (EINVAL);
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if ((error = fdalloc(p, newmin, &i)))
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return (error);
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return (finishdup(fdp, uap->fd, i, p->p_retval));
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case F_GETFD:
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p->p_retval[0] = *pop & 1;
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return (0);
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case F_SETFD:
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*pop = (*pop &~ 1) | (uap->arg & 1);
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return (0);
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case F_GETFL:
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p->p_retval[0] = OFLAGS(fp->f_flag);
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return (0);
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case F_SETFL:
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fp->f_flag &= ~FCNTLFLAGS;
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fp->f_flag |= FFLAGS(uap->arg & ~O_ACCMODE) & FCNTLFLAGS;
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tmp = fp->f_flag & FNONBLOCK;
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error = (*fp->f_ops->fo_ioctl)(fp, FIONBIO, (caddr_t)&tmp, p);
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if (error)
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return (error);
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tmp = fp->f_flag & FASYNC;
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error = (*fp->f_ops->fo_ioctl)(fp, FIOASYNC, (caddr_t)&tmp, p);
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if (!error)
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return (0);
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fp->f_flag &= ~FNONBLOCK;
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tmp = 0;
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(void) (*fp->f_ops->fo_ioctl)(fp, FIONBIO, (caddr_t)&tmp, p);
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return (error);
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case F_GETOWN:
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error = (*fp->f_ops->fo_ioctl)
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(fp, FIOGETOWN, (caddr_t)p->p_retval, p);
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return (error);
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case F_SETOWN:
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return ((*fp->f_ops->fo_ioctl)
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(fp, FIOSETOWN, (caddr_t)&uap->arg, p));
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case F_SETLKW:
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flg |= F_WAIT;
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/* Fall into F_SETLK */
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case F_SETLK:
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if (fp->f_type != DTYPE_VNODE)
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return (EBADF);
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vp = (struct vnode *)fp->f_data;
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/* Copy in the lock structure */
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error = copyin((caddr_t)(intptr_t)uap->arg, (caddr_t)&fl,
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sizeof(fl));
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if (error)
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return (error);
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if (fl.l_whence == SEEK_CUR)
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fl.l_start += fp->f_offset;
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switch (fl.l_type) {
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case F_RDLCK:
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if ((fp->f_flag & FREAD) == 0)
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return (EBADF);
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p->p_flag |= P_ADVLOCK;
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return (VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &fl, flg));
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case F_WRLCK:
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if ((fp->f_flag & FWRITE) == 0)
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return (EBADF);
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p->p_flag |= P_ADVLOCK;
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return (VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &fl, flg));
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case F_UNLCK:
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return (VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &fl,
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F_POSIX));
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default:
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return (EINVAL);
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}
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case F_GETLK:
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if (fp->f_type != DTYPE_VNODE)
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return (EBADF);
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vp = (struct vnode *)fp->f_data;
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/* Copy in the lock structure */
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error = copyin((caddr_t)(intptr_t)uap->arg, (caddr_t)&fl,
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sizeof(fl));
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if (error)
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return (error);
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if (fl.l_type != F_RDLCK && fl.l_type != F_WRLCK &&
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fl.l_type != F_UNLCK)
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return (EINVAL);
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if (fl.l_whence == SEEK_CUR)
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fl.l_start += fp->f_offset;
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if ((error = VOP_ADVLOCK(vp,(caddr_t)p,F_GETLK,&fl,F_POSIX)))
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return (error);
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return (copyout((caddr_t)&fl, (caddr_t)(intptr_t)uap->arg,
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sizeof(fl)));
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default:
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return (EINVAL);
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}
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/* NOTREACHED */
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}
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/*
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* Common code for dup, dup2, and fcntl(F_DUPFD).
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*/
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static int
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finishdup(fdp, old, new, retval)
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register struct filedesc *fdp;
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register int old, new;
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register_t *retval;
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{
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register struct file *fp;
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fp = fdp->fd_ofiles[old];
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fdp->fd_ofiles[new] = fp;
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fdp->fd_ofileflags[new] = fdp->fd_ofileflags[old] &~ UF_EXCLOSE;
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fp->f_count++;
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if (new > fdp->fd_lastfile)
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fdp->fd_lastfile = new;
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*retval = new;
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return (0);
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}
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/*
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* If sigio is on the list associated with a process or process group,
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* disable signalling from the device, remove sigio from the list and
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* free sigio.
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*/
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void
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funsetown(sigio)
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struct sigio *sigio;
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{
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int s;
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if (sigio == NULL)
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return;
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s = splhigh();
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*(sigio->sio_myref) = NULL;
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splx(s);
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if (sigio->sio_pgid < 0) {
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SLIST_REMOVE(&sigio->sio_pgrp->pg_sigiolst, sigio,
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sigio, sio_pgsigio);
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} else /* if ((*sigiop)->sio_pgid > 0) */ {
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SLIST_REMOVE(&sigio->sio_proc->p_sigiolst, sigio,
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sigio, sio_pgsigio);
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}
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crfree(sigio->sio_ucred);
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FREE(sigio, M_SIGIO);
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}
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/* Free a list of sigio structures. */
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void
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funsetownlst(sigiolst)
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struct sigiolst *sigiolst;
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{
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struct sigio *sigio;
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while ((sigio = sigiolst->slh_first) != NULL)
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funsetown(sigio);
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}
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/*
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* This is common code for FIOSETOWN ioctl called by fcntl(fd, F_SETOWN, arg).
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*
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* After permission checking, add a sigio structure to the sigio list for
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* the process or process group.
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*/
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int
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fsetown(pgid, sigiop)
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pid_t pgid;
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struct sigio **sigiop;
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{
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struct proc *proc;
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struct pgrp *pgrp;
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struct sigio *sigio;
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int s;
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if (pgid == 0) {
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funsetown(*sigiop);
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return (0);
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}
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if (pgid > 0) {
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proc = pfind(pgid);
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if (proc == NULL)
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return (ESRCH);
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/*
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* Policy - Don't allow a process to FSETOWN a process
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* in another session.
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*
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* Remove this test to allow maximum flexibility or
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* restrict FSETOWN to the current process or process
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* group for maximum safety.
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*/
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else if (proc->p_session != curproc->p_session)
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return (EPERM);
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pgrp = NULL;
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} else /* if (pgid < 0) */ {
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pgrp = pgfind(-pgid);
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if (pgrp == NULL)
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return (ESRCH);
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/*
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* Policy - Don't allow a process to FSETOWN a process
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* in another session.
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*
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* Remove this test to allow maximum flexibility or
|
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* restrict FSETOWN to the current process or process
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* group for maximum safety.
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*/
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else if (pgrp->pg_session != curproc->p_session)
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return (EPERM);
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proc = NULL;
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}
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funsetown(*sigiop);
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MALLOC(sigio, struct sigio *, sizeof(struct sigio), M_SIGIO,
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M_WAITOK);
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if (pgid > 0) {
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SLIST_INSERT_HEAD(&proc->p_sigiolst, sigio, sio_pgsigio);
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sigio->sio_proc = proc;
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} else {
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SLIST_INSERT_HEAD(&pgrp->pg_sigiolst, sigio, sio_pgsigio);
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sigio->sio_pgrp = pgrp;
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}
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sigio->sio_pgid = pgid;
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crhold(curproc->p_ucred);
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sigio->sio_ucred = curproc->p_ucred;
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/* It would be convenient if p_ruid was in ucred. */
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sigio->sio_ruid = curproc->p_cred->p_ruid;
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sigio->sio_myref = sigiop;
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s = splhigh();
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*sigiop = sigio;
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splx(s);
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return (0);
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}
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|
|
|
/*
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|
* 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);
|
|
}
|
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|
|
/*
|
|
* Close a file descriptor.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct close_args {
|
|
int fd;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
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|
close(p, uap)
|
|
struct proc *p;
|
|
struct close_args *uap;
|
|
{
|
|
register struct filedesc *fdp = p->p_fd;
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|
register struct file *fp;
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|
register int fd = uap->fd;
|
|
register u_char *pf;
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|
|
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if ((unsigned)fd >= fdp->fd_nfiles ||
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|
(fp = fdp->fd_ofiles[fd]) == NULL)
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return (EBADF);
|
|
pf = (u_char *)&fdp->fd_ofileflags[fd];
|
|
if (*pf & UF_MAPPED)
|
|
(void) munmapfd(p, fd);
|
|
fdp->fd_ofiles[fd] = NULL;
|
|
while (fdp->fd_lastfile > 0 && fdp->fd_ofiles[fdp->fd_lastfile] == NULL)
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|
fdp->fd_lastfile--;
|
|
if (fd < fdp->fd_freefile)
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|
fdp->fd_freefile = fd;
|
|
*pf = 0;
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|
return (closef(fp, p));
|
|
}
|
|
|
|
#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
|
|
/* ARGSUSED */
|
|
int
|
|
ofstat(p, uap)
|
|
struct proc *p;
|
|
register struct ofstat_args *uap;
|
|
{
|
|
register struct filedesc *fdp = p->p_fd;
|
|
register struct file *fp;
|
|
struct stat ub;
|
|
struct ostat oub;
|
|
int error;
|
|
|
|
if ((unsigned)uap->fd >= fdp->fd_nfiles ||
|
|
(fp = fdp->fd_ofiles[uap->fd]) == NULL)
|
|
return (EBADF);
|
|
switch (fp->f_type) {
|
|
|
|
case DTYPE_FIFO:
|
|
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;
|
|
|
|
case DTYPE_PIPE:
|
|
error = pipe_stat((struct pipe *)fp->f_data, &ub);
|
|
break;
|
|
|
|
default:
|
|
panic("ofstat");
|
|
/*NOTREACHED*/
|
|
}
|
|
cvtstat(&ub, &oub);
|
|
if (error == 0)
|
|
error = copyout((caddr_t)&oub, (caddr_t)uap->sb, sizeof (oub));
|
|
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
|
|
/* ARGSUSED */
|
|
int
|
|
fstat(p, uap)
|
|
struct proc *p;
|
|
register struct fstat_args *uap;
|
|
{
|
|
register struct filedesc *fdp = p->p_fd;
|
|
register struct file *fp;
|
|
struct stat ub;
|
|
int error;
|
|
|
|
if ((unsigned)uap->fd >= fdp->fd_nfiles ||
|
|
(fp = fdp->fd_ofiles[uap->fd]) == NULL)
|
|
return (EBADF);
|
|
switch (fp->f_type) {
|
|
|
|
case DTYPE_FIFO:
|
|
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;
|
|
|
|
case DTYPE_PIPE:
|
|
error = pipe_stat((struct pipe *)fp->f_data, &ub);
|
|
break;
|
|
|
|
default:
|
|
panic("fstat");
|
|
/*NOTREACHED*/
|
|
}
|
|
if (error == 0)
|
|
error = copyout((caddr_t)&ub, (caddr_t)uap->sb, sizeof (ub));
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Return status information about a file descriptor.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct nfstat_args {
|
|
int fd;
|
|
struct nstat *sb;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
nfstat(p, uap)
|
|
struct proc *p;
|
|
register struct nfstat_args *uap;
|
|
{
|
|
register struct filedesc *fdp = p->p_fd;
|
|
register struct file *fp;
|
|
struct stat ub;
|
|
struct nstat nub;
|
|
int error;
|
|
|
|
if ((unsigned)uap->fd >= fdp->fd_nfiles ||
|
|
(fp = fdp->fd_ofiles[uap->fd]) == NULL)
|
|
return (EBADF);
|
|
switch (fp->f_type) {
|
|
|
|
case DTYPE_FIFO:
|
|
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;
|
|
|
|
case DTYPE_PIPE:
|
|
error = pipe_stat((struct pipe *)fp->f_data, &ub);
|
|
break;
|
|
|
|
default:
|
|
panic("fstat");
|
|
/*NOTREACHED*/
|
|
}
|
|
if (error == 0) {
|
|
cvtnstat(&ub, &nub);
|
|
error = copyout((caddr_t)&nub, (caddr_t)uap->sb, sizeof (nub));
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Return pathconf information about a file descriptor.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct fpathconf_args {
|
|
int fd;
|
|
int name;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
fpathconf(p, uap)
|
|
struct proc *p;
|
|
register struct fpathconf_args *uap;
|
|
{
|
|
struct filedesc *fdp = p->p_fd;
|
|
struct file *fp;
|
|
struct vnode *vp;
|
|
|
|
if ((unsigned)uap->fd >= fdp->fd_nfiles ||
|
|
(fp = fdp->fd_ofiles[uap->fd]) == NULL)
|
|
return (EBADF);
|
|
switch (fp->f_type) {
|
|
|
|
case DTYPE_PIPE:
|
|
case DTYPE_SOCKET:
|
|
if (uap->name != _PC_PIPE_BUF)
|
|
return (EINVAL);
|
|
p->p_retval[0] = PIPE_BUF;
|
|
return (0);
|
|
|
|
case DTYPE_FIFO:
|
|
case DTYPE_VNODE:
|
|
vp = (struct vnode *)fp->f_data;
|
|
return (VOP_PATHCONF(vp, uap->name, p->p_retval));
|
|
|
|
default:
|
|
panic("fpathconf");
|
|
}
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
/*
|
|
* Allocate a file descriptor for the process.
|
|
*/
|
|
static int fdexpand;
|
|
SYSCTL_INT(_debug, OID_AUTO, fdexpand, CTLFLAG_RD, &fdexpand, 0, "");
|
|
|
|
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, 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);
|
|
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(p, n)
|
|
struct proc *p;
|
|
register int n;
|
|
{
|
|
register struct filedesc *fdp = p->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(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)))
|
|
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++;
|
|
MALLOC(fp, struct file *, sizeof(struct file), M_FILE, M_WAITOK);
|
|
bzero(fp, sizeof(struct file));
|
|
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;
|
|
fp->f_count = 1;
|
|
fp->f_cred = p->p_ucred;
|
|
fp->f_seqcount = 1;
|
|
crhold(fp->f_cred);
|
|
if (resultfp)
|
|
*resultfp = fp;
|
|
if (resultfd)
|
|
*resultfd = i;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Free a file descriptor.
|
|
*/
|
|
void
|
|
ffree(fp)
|
|
register struct file *fp;
|
|
{
|
|
LIST_REMOVE(fp, f_list);
|
|
crfree(fp->f_cred);
|
|
#ifdef DIAGNOSTIC
|
|
fp->f_count = 0;
|
|
#endif
|
|
nfiles--;
|
|
FREE(fp, M_FILE);
|
|
}
|
|
|
|
/*
|
|
* Build a new filedesc structure.
|
|
*/
|
|
struct filedesc *
|
|
fdinit(p)
|
|
struct proc *p;
|
|
{
|
|
register struct filedesc0 *newfdp;
|
|
register struct filedesc *fdp = p->p_fd;
|
|
|
|
MALLOC(newfdp, struct filedesc0 *, sizeof(struct filedesc0),
|
|
M_FILEDESC, M_WAITOK);
|
|
bzero(newfdp, sizeof(struct filedesc0));
|
|
newfdp->fd_fd.fd_cdir = fdp->fd_cdir;
|
|
VREF(newfdp->fd_fd.fd_cdir);
|
|
newfdp->fd_fd.fd_rdir = fdp->fd_rdir;
|
|
VREF(newfdp->fd_fd.fd_rdir);
|
|
|
|
/* 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_freefile = 0;
|
|
newfdp->fd_fd.fd_lastfile = 0;
|
|
|
|
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(p)
|
|
struct proc *p;
|
|
{
|
|
register struct filedesc *newfdp, *fdp = p->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));
|
|
VREF(newfdp->fd_cdir);
|
|
VREF(newfdp->fd_rdir);
|
|
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));
|
|
fpp = newfdp->fd_ofiles;
|
|
for (i = newfdp->fd_lastfile; i-- >= 0; 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;
|
|
struct file **fpp;
|
|
register int i;
|
|
|
|
/*
|
|
* Certain daemons might not have file descriptors
|
|
*/
|
|
if (fdp == NULL)
|
|
return;
|
|
|
|
if (--fdp->fd_refcnt > 0)
|
|
return;
|
|
fpp = fdp->fd_ofiles;
|
|
for (i = fdp->fd_lastfile; i-- >= 0; fpp++)
|
|
if (*fpp)
|
|
(void) closef(*fpp, p);
|
|
if (fdp->fd_nfiles > NDFILE)
|
|
FREE(fdp->fd_ofiles, M_FILEDESC);
|
|
vrele(fdp->fd_cdir);
|
|
vrele(fdp->fd_rdir);
|
|
FREE(fdp, M_FILEDESC);
|
|
}
|
|
|
|
/*
|
|
* Close any files on exec?
|
|
*/
|
|
void
|
|
fdcloseexec(p)
|
|
struct proc *p;
|
|
{
|
|
struct filedesc *fdp = p->p_fd;
|
|
struct file **fpp;
|
|
char *fdfp;
|
|
register int i;
|
|
|
|
/*
|
|
* Certain daemons might not have file descriptors
|
|
*/
|
|
if (fdp == NULL)
|
|
return;
|
|
|
|
fpp = fdp->fd_ofiles;
|
|
fdfp = fdp->fd_ofileflags;
|
|
for (i = 0; i <= fdp->fd_lastfile; i++, fpp++, fdfp++)
|
|
if (*fpp != NULL && (*fdfp & UF_EXCLOSE)) {
|
|
if (*fdfp & UF_MAPPED)
|
|
(void) munmapfd(p, i);
|
|
(void) closef(*fpp, p);
|
|
*fpp = NULL;
|
|
*fdfp = 0;
|
|
if (i < fdp->fd_freefile)
|
|
fdp->fd_freefile = i;
|
|
}
|
|
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: p may be NULL when closing a file
|
|
* that was being passed in a message.
|
|
*/
|
|
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 (--fp->f_count > 0)
|
|
return (0);
|
|
if (fp->f_count < 0)
|
|
panic("closef: 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)
|
|
error = (*fp->f_ops->fo_close)(fp, p);
|
|
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
|
|
/* ARGSUSED */
|
|
int
|
|
flock(p, uap)
|
|
struct proc *p;
|
|
register struct flock_args *uap;
|
|
{
|
|
register struct filedesc *fdp = p->p_fd;
|
|
register struct file *fp;
|
|
struct vnode *vp;
|
|
struct flock lf;
|
|
|
|
if ((unsigned)uap->fd >= fdp->fd_nfiles ||
|
|
(fp = fdp->fd_ofiles[uap->fd]) == NULL)
|
|
return (EBADF);
|
|
if (fp->f_type != DTYPE_VNODE)
|
|
return (EOPNOTSUPP);
|
|
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;
|
|
return (VOP_ADVLOCK(vp, (caddr_t)fp, F_UNLCK, &lf, F_FLOCK));
|
|
}
|
|
if (uap->how & LOCK_EX)
|
|
lf.l_type = F_WRLCK;
|
|
else if (uap->how & LOCK_SH)
|
|
lf.l_type = F_RDLCK;
|
|
else
|
|
return (EBADF);
|
|
fp->f_flag |= FHASLOCK;
|
|
if (uap->how & LOCK_NB)
|
|
return (VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, F_FLOCK));
|
|
return (VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, F_FLOCK|F_WAIT));
|
|
}
|
|
|
|
/*
|
|
* 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, 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(fdp, indx, dfd, mode, error)
|
|
register struct filedesc *fdp;
|
|
register 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, 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 || fp == wfp)
|
|
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);
|
|
fdp->fd_ofiles[indx] = wfp;
|
|
fdp->fd_ofileflags[indx] = fdp->fd_ofileflags[dfd];
|
|
wfp->f_count++;
|
|
if (indx > fdp->fd_lastfile)
|
|
fdp->fd_lastfile = indx;
|
|
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_ofiles[dfd] = NULL;
|
|
fdp->fd_ofileflags[indx] = fdp->fd_ofileflags[dfd];
|
|
fdp->fd_ofileflags[dfd] = 0;
|
|
/*
|
|
* 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
|
|
*/
|
|
for (fp = filehead.lh_first; fp != NULL; fp = fp->f_list.le_next) {
|
|
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", "");
|
|
|
|
SYSCTL_INT(_kern, KERN_MAXFILESPERPROC, maxfilesperproc,
|
|
CTLFLAG_RW, &maxfilesperproc, 0, "");
|
|
|
|
SYSCTL_INT(_kern, KERN_MAXFILES, maxfiles, CTLFLAG_RW, &maxfiles, 0, "");
|
|
|
|
static fildesc_devsw_installed = 0;
|
|
#ifdef DEVFS
|
|
static void *devfs_token_stdin;
|
|
static void *devfs_token_stdout;
|
|
static void *devfs_token_stderr;
|
|
static void *devfs_token_fildesc[NUMFDESC];
|
|
#endif
|
|
|
|
static void fildesc_drvinit(void *unused)
|
|
{
|
|
dev_t dev;
|
|
#ifdef DEVFS
|
|
int fd;
|
|
#endif
|
|
|
|
if( ! fildesc_devsw_installed ) {
|
|
dev = makedev(CDEV_MAJOR,0);
|
|
cdevsw_add(&dev,&fildesc_cdevsw,NULL);
|
|
fildesc_devsw_installed = 1;
|
|
#ifdef DEVFS
|
|
for (fd = 0; fd < NUMFDESC; fd++)
|
|
devfs_token_fildesc[fd] =
|
|
devfs_add_devswf(&fildesc_cdevsw, fd, DV_CHR,
|
|
UID_BIN, GID_BIN, 0666,
|
|
"fd/%d", fd);
|
|
devfs_token_stdin =
|
|
devfs_add_devswf(&fildesc_cdevsw, 0, DV_CHR,
|
|
UID_ROOT, GID_WHEEL, 0666,
|
|
"stdin");
|
|
devfs_token_stdout =
|
|
devfs_add_devswf(&fildesc_cdevsw, 1, DV_CHR,
|
|
UID_ROOT, GID_WHEEL, 0666,
|
|
"stdout");
|
|
devfs_token_stderr =
|
|
devfs_add_devswf(&fildesc_cdevsw, 2, DV_CHR,
|
|
UID_ROOT, GID_WHEEL, 0666,
|
|
"stderr");
|
|
#endif
|
|
}
|
|
}
|
|
|
|
SYSINIT(fildescdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,
|
|
fildesc_drvinit,NULL)
|
|
|
|
|