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linux_llseek.c revision 1.25 
      1 /*	$NetBSD: linux_llseek.c,v 1.25 1998/10/04 00:02:36 fvdl Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Frank van der Linden and Eric Haszlakiewicz.
      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/param.h>
     40 #include <sys/systm.h>
     41 #include <sys/kernel.h>
     42 #include <sys/mount.h>
     43 #include <sys/malloc.h>
     44 #include <sys/conf.h>
     45 
     46 #include <sys/syscallargs.h>
     47 
     48 #include <compat/linux/common/linux_types.h>
     49 #include <compat/linux/common/linux_signal.h>
     50 #include <compat/linux/common/linux_fcntl.h>
     51 #include <compat/linux/common/linux_util.h>
     52 
     53 #include <compat/linux/linux_syscallargs.h>
     54 
     55 /* Used on: arm, i386, m68k, mips, ppc, sparc */
     56 /* Not used on: alpha, sparc64 */
     57 
     58 /*
     59  * This appears to be part of a Linux attempt to switch to 64 bits file sizes.
     60  */
     61 int
     62 linux_sys_llseek(p, v, retval)
     63 	struct proc *p;
     64 	void *v;
     65 	register_t *retval;
     66 {
     67 	struct linux_sys_llseek_args /* {
     68 		syscallarg(int) fd;
     69 		syscallarg(uint32_t) ohigh;
     70 		syscallarg(uint32_t) olow;
     71 		syscallarg(caddr_t) res;
     72 		syscallarg(int) whence;
     73 	} */ *uap = v;
     74 	struct sys_lseek_args bla;
     75 	int error;
     76 	off_t off;
     77 
     78 	off = SCARG(uap, olow) | (((off_t) SCARG(uap, ohigh)) << 32);
     79 
     80 	SCARG(&bla, fd) = SCARG(uap, fd);
     81 	SCARG(&bla, offset) = off;
     82 	SCARG(&bla, whence) = SCARG(uap, whence);
     83 
     84 	if ((error = sys_lseek(p, &bla, retval)))
     85 		return error;
     86 
     87 	if ((error = copyout(retval, SCARG(uap, res), sizeof (off_t))))
     88 		return error;
     89 
     90 	retval[0] = 0;
     91 	return 0;
     92 }
     93