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procfs_fd.c revision 1.11 
      1 /*	$NetBSD: procfs_fd.c,v 1.11 2007/02/09 21:55:36 ad Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2003 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  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 __KERNEL_RCSID(0, "$NetBSD: procfs_fd.c,v 1.11 2007/02/09 21:55:36 ad Exp $");
     41 
     42 #include <sys/param.h>
     43 #include <sys/systm.h>
     44 #include <sys/time.h>
     45 #include <sys/kernel.h>
     46 #include <sys/proc.h>
     47 #include <sys/vnode.h>
     48 #include <sys/file.h>
     49 #include <sys/filedesc.h>
     50 #include <miscfs/procfs/procfs.h>
     51 
     52 int
     53 procfs_dofd(
     54     struct lwp *curl,
     55     struct proc *p,
     56     struct pfsnode *pfs,
     57     struct uio *uio
     58 )
     59 {
     60 	int error;
     61 	struct file *fp;
     62 	off_t offs;
     63 
     64 	mutex_enter(&p->p_mutex);
     65 	fp = fd_getfile(p->p_fd, pfs->pfs_fd);
     66 	mutex_exit(&p->p_mutex);
     67 	if (fp == NULL)
     68 		return (EBADF);
     69 
     70 	FILE_USE(fp);
     71 
     72 	offs = fp->f_offset;
     73 
     74 	switch (uio->uio_rw) {
     75 	case UIO_READ:
     76 		error = (*fp->f_ops->fo_read)(fp, &offs, uio, curl->l_cred, 0);
     77 		break;
     78 	case UIO_WRITE:
     79 		error = (*fp->f_ops->fo_write)(fp, &offs, uio, curl->l_cred,0);
     80 		break;
     81 	default:
     82 		panic("bad uio op");
     83 	}
     84 
     85 	FILE_UNUSE(fp, curl);
     86 
     87 	return (error);
     88 }
     89