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      1 /*	$NetBSD: procfs_fd.c,v 1.14 2008/04/28 20:24:08 martin 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 1.14 2008/04/28 20:24:08 martin 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 }
     73