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 1.27 2003/01/18 08:02:53 thorpej 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/cdefs.h>
   40 __KERNEL_RCSID(0, "$NetBSD: linux_llseek.c,v 1.27 2003/01/18 08:02:53 thorpej Exp $");
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/kernel.h>
   45 #include <sys/mount.h>
   46 #include <sys/malloc.h>
   47 #include <sys/conf.h>
   48 
   49 #include <sys/sa.h>
   50 #include <sys/syscallargs.h>
   51 
   52 #include <compat/linux/common/linux_types.h>
   53 #include <compat/linux/common/linux_signal.h>
   54 #include <compat/linux/common/linux_fcntl.h>
   55 #include <compat/linux/common/linux_util.h>
   56 
   57 #include <compat/linux/linux_syscallargs.h>
   58 
   59 /* Used on: arm, i386, m68k, mips, ppc, sparc */
   60 /* Not used on: alpha, sparc64 */
   61 
   62 /*
   63  * This appears to be part of a Linux attempt to switch to 64 bits file sizes.
   64  */
   65 int
   66 linux_sys_llseek(l, v, retval)
   67         struct lwp *l;
   68         void *v;
   69         register_t *retval;
   70 {
   71         struct linux_sys_llseek_args /* {
   72                 syscallarg(int) fd;
   73                 syscallarg(uint32_t) ohigh;
   74                 syscallarg(uint32_t) olow;
   75                 syscallarg(caddr_t) res;
   76                 syscallarg(int) whence;
   77         } */ *uap = v;
   78         struct sys_lseek_args bla;
   79         int error;
   80         off_t off;
   81 
   82         off = SCARG(uap, olow) | (((off_t) SCARG(uap, ohigh)) << 32);
   83 
   84         SCARG(&bla, fd) = SCARG(uap, fd);
   85         SCARG(&bla, offset) = off;
   86         SCARG(&bla, whence) = SCARG(uap, whence);
   87 
   88         if ((error = sys_lseek(l, &bla, retval)))
   89                 return error;
   90 
   91         if ((error = copyout(retval, SCARG(uap, res), sizeof (off_t))))
   92                 return error;
   93 
   94         retval[0] = 0;
   95         return 0;
   96 }

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