| 1 | /* $NetBSD: linux_llseek.c,v 1.34 2014/11/09 17:48:08 maxv 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 1.34 2014/11/09 17:48:08 maxv 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: 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 | |