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procfs_fd.c revision 1.6 
      1 /*	$NetBSD: procfs_fd.c,v 1.6 2005/12/11 12:24:51 christos 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 #include <sys/cdefs.h>
     39 __KERNEL_RCSID(0, "$NetBSD: procfs_fd.c,v 1.6 2005/12/11 12:24:51 christos Exp $");
     40 
     41 #include <sys/param.h>
     42 #include <sys/systm.h>
     43 #include <sys/time.h>
     44 #include <sys/kernel.h>
     45 #include <sys/proc.h>
     46 #include <sys/vnode.h>
     47 #include <sys/file.h>
     48 #include <sys/filedesc.h>
     49 #include <miscfs/procfs/procfs.h>
     50 
     51 int
     52 procfs_dofd(curl, p, pfs, uio)
     53 	struct lwp *curl;
     54 	struct proc *p;
     55 	struct pfsnode *pfs;
     56 	struct uio *uio;
     57 {
     58 	struct proc *curp = curl->l_proc;
     59 	int error;
     60 	struct file *fp;
     61 	struct proc *pown;
     62 	off_t offs;
     63 
     64 	if ((error = procfs_getfp(pfs, &pown, &fp)) != 0)
     65 		return error;
     66 
     67 	FILE_USE(fp);
     68 
     69 	offs = fp->f_offset;
     70 
     71 	switch (uio->uio_rw) {
     72 	case UIO_READ:
     73 		error = (*fp->f_ops->fo_read)(fp, &offs, uio, curp->p_ucred, 0);
     74 		break;
     75 	case UIO_WRITE:
     76 		error = (*fp->f_ops->fo_write)(fp, &offs, uio, curp->p_ucred,0);
     77 		break;
     78 	default:
     79 		panic("bad uio op");
     80 	}
     81 
     82 	FILE_UNUSE(fp, proc_representative_lwp(pown));
     83 
     84 	return (error);
     85 }
     86