1/*
2 * Copyright (c) 1982, 1986, 1989, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
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31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * @(#)kern_descrip.c 8.6 (Berkeley) 4/19/94
39 * $Id: kern_descrip.c,v 1.22 1995/12/08 23:21:31 phk Exp $
40 */
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/sysproto.h>
45#include <sys/conf.h>
46#include <sys/filedesc.h>
47#include <sys/kernel.h>
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70#define NUMFDESC 64
71
72#define CDEV_MAJOR 22
73static struct cdevsw fildesc_cdevsw =
74 { fdopen, noclose, noread, nowrite, /*22*/
75 noioc, nostop, nullreset, nodevtotty,/*fd(!=Fd)*/
76 noselect, nommap, nostrat };
77
78static int finishdup(struct filedesc *fdp, int old, int new, int *retval);
79/*
80 * Descriptor management.
81 */
82struct file *filehead; /* head of list of open files */
83int nfiles; /* actual number of open files */
84
85/*
86 * System calls on descriptors.
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331 return (EINVAL);
332 }
333 /* NOTREACHED */
334}
335
336/*
337 * Common code for dup, dup2, and fcntl(F_DUPFD).
338 */
339static int
340finishdup(fdp, old, new, retval)
341 register struct filedesc *fdp;
342 register int old, new, *retval;
343{
344 register struct file *fp;
345
346 fp = fdp->fd_ofiles[old];
347 fdp->fd_ofiles[new] = fp;
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517 panic("fpathconf");
518 }
519 /*NOTREACHED*/
520}
521
522/*
523 * Allocate a file descriptor for the process.
524 */
525static int fdexpand;
526SYSCTL_INT(_debug, OID_AUTO, fdexpand, CTLFLAG_RD, &fdexpand, 0, "");
527
528int
529fdalloc(p, want, result)
530 struct proc *p;
531 int want;
532 int *result;
533{
534 register struct filedesc *fdp = p->p_fd;
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2 * Copyright (c) 1982, 1986, 1989, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
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31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * @(#)kern_descrip.c 8.6 (Berkeley) 4/19/94
39 * $Id: kern_descrip.c,v 1.22 1995/12/08 23:21:31 phk Exp $
40 */
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/sysproto.h>
45#include <sys/conf.h>
46#include <sys/filedesc.h>
47#include <sys/kernel.h>
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70#define NUMFDESC 64
71
72#define CDEV_MAJOR 22
73static struct cdevsw fildesc_cdevsw =
74 { fdopen, noclose, noread, nowrite, /*22*/
75 noioc, nostop, nullreset, nodevtotty,/*fd(!=Fd)*/
76 noselect, nommap, nostrat };
77
78static int finishdup(struct filedesc *fdp, int old, int new, int *retval);
79/*
80 * Descriptor management.
81 */
82struct file *filehead; /* head of list of open files */
83int nfiles; /* actual number of open files */
84
85/*
86 * System calls on descriptors.
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331 return (EINVAL);
332 }
333 /* NOTREACHED */
334}
335
336/*
337 * Common code for dup, dup2, and fcntl(F_DUPFD).
338 */
339static int
340finishdup(fdp, old, new, retval)
341 register struct filedesc *fdp;
342 register int old, new, *retval;
343{
344 register struct file *fp;
345
346 fp = fdp->fd_ofiles[old];
347 fdp->fd_ofiles[new] = fp;
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517 panic("fpathconf");
518 }
519 /*NOTREACHED*/
520}
521
522/*
523 * Allocate a file descriptor for the process.
524 */
525static int fdexpand;
526SYSCTL_INT(_debug, OID_AUTO, fdexpand, CTLFLAG_RD, &fdexpand, 0, "");
527
528int
529fdalloc(p, want, result)
530 struct proc *p;
531 int want;
532 int *result;
533{
534 register struct filedesc *fdp = p->p_fd;
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