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      1 /*	$NetBSD: linux_llseek.c,v 1.35 2021/09/23 06:56:27 ryo 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  *
     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: linux_llseek.c,v 1.35 2021/09/23 06:56:27 ryo Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/systm.h>
     37 #include <sys/kernel.h>
     38 #include <sys/mount.h>
     39 #include <sys/conf.h>
     40 
     41 #include <sys/sched.h>
     42 #include <sys/syscallargs.h>
     43 
     44 #include <compat/linux/common/linux_types.h>
     45 #include <compat/linux/common/linux_signal.h>
     46 #include <compat/linux/common/linux_fcntl.h>
     47 #include <compat/linux/common/linux_util.h>
     48 
     49 #include <compat/linux/linux_syscallargs.h>
     50 
     51 /* Used on: arm, i386, m68k, mips, ppc, sparc */
     52 /* Not used on: aarch64, alpha, sparc64 */
     53 
     54 /*
     55  * This appears to be part of a Linux attempt to switch to 64 bits file sizes.
     56  */
     57 int
     58 linux_sys_llseek(struct lwp *l, const struct linux_sys_llseek_args *uap, register_t *retval)
     59 {
     60 	/* {
     61 		syscallarg(int) fd;
     62 		syscallarg(uint32_t) ohigh;
     63 		syscallarg(uint32_t) olow;
     64 		syscallarg(void *) res;
     65 		syscallarg(int) whence;
     66 	} */
     67 	struct sys_lseek_args bla;
     68 	int error;
     69 	off_t off;
     70 
     71 	off = SCARG(uap, olow) | (((off_t) SCARG(uap, ohigh)) << 32);
     72 
     73 	SCARG(&bla, fd) = SCARG(uap, fd);
     74 	SCARG(&bla, offset) = off;
     75 	SCARG(&bla, whence) = SCARG(uap, whence);
     76 
     77 	if ((error = sys_lseek(l, &bla, retval)))
     78 		return error;
     79 
     80 	if ((error = copyout(retval, SCARG(uap, res), sizeof (off_t))))
     81 		return error;
     82 
     83 	retval[0] = 0;
     84 	return 0;
     85 }
     86