The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/common/linux_llseek.c

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    1 /*      $NetBSD: linux_llseek.c,v 1.33 2008/06/18 12:24:17 tsutsui 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 1.33 2008/06/18 12:24:17 tsutsui 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/malloc.h>
   40 #include <sys/conf.h>
   41 
   42 #include <sys/sched.h>
   43 #include <sys/syscallargs.h>
   44 
   45 #include <compat/linux/common/linux_types.h>
   46 #include <compat/linux/common/linux_signal.h>
   47 #include <compat/linux/common/linux_fcntl.h>
   48 #include <compat/linux/common/linux_util.h>
   49 
   50 #include <compat/linux/linux_syscallargs.h>
   51 
   52 /* Used on: arm, i386, m68k, mips, ppc, sparc */
   53 /* Not used on: alpha, sparc64 */
   54 
   55 /*
   56  * This appears to be part of a Linux attempt to switch to 64 bits file sizes.
   57  */
   58 int
   59 linux_sys_llseek(struct lwp *l, const struct linux_sys_llseek_args *uap, register_t *retval)
   60 {
   61         /* {
   62                 syscallarg(int) fd;
   63                 syscallarg(uint32_t) ohigh;
   64                 syscallarg(uint32_t) olow;
   65                 syscallarg(void *) res;
   66                 syscallarg(int) whence;
   67         } */
   68         struct sys_lseek_args bla;
   69         int error;
   70         off_t off;
   71 
   72         off = SCARG(uap, olow) | (((off_t) SCARG(uap, ohigh)) << 32);
   73 
   74         SCARG(&bla, fd) = SCARG(uap, fd);
   75         SCARG(&bla, offset) = off;
   76         SCARG(&bla, whence) = SCARG(uap, whence);
   77 
   78         if ((error = sys_lseek(l, &bla, retval)))
   79                 return error;
   80 
   81         if ((error = copyout(retval, SCARG(uap, res), sizeof (off_t))))
   82                 return error;
   83 
   84         retval[0] = 0;
   85         return 0;
   86 }

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