sys/miscfs/procfs/procfs_fd.c

   1 /*      $NetBSD: procfs_fd.c,v 1.13 2008/03/21 21:55:00 ad Exp $        */
   2
   3 /*-
   4  * Copyright (c) 2003, 2008 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Christos Zoulas.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __KERNEL_RCSID(0, "$NetBSD: procfs_fd.c,v 1.13 2008/03/21 21:55:00 ad Exp $");
  34
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/time.h>
  38 #include <sys/kernel.h>
  39 #include <sys/proc.h>
  40 #include <sys/vnode.h>
  41 #include <sys/file.h>
  42 #include <sys/filedesc.h>
  43
  44 #include <miscfs/procfs/procfs.h>
  45
  46 int
  47 procfs_dofd(lwp_t *curl, proc_t *p, struct pfsnode *pfs, struct uio *uio)
  48 {
  49         int error;
  50         file_t *fp;
  51         off_t offs;
  52
  53         if ((fp = fd_getfile2(p, pfs->pfs_fd)) == NULL)
  54                 return EBADF;
  55
  56         offs = fp->f_offset;
  57
  58         switch (uio->uio_rw) {
  59         case UIO_READ:
  60                 error = (*fp->f_ops->fo_read)(fp, &offs, uio, curl->l_cred, 0);
  61                 break;
  62         case UIO_WRITE:
  63                 error = (*fp->f_ops->fo_write)(fp, &offs, uio, curl->l_cred, 0);
  64                 break;
  65         default:
  66                 panic("bad uio op");
  67         }
  68
  69         closef(fp);
  70
  71         return (error);
  72 }