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linux_llseek.c revision 1.24 
      1 /*	$NetBSD: linux_llseek.c,v 1.24 1998/10/03 20:17:41 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by 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 /*
     40  * Copyright (c) 1995 Frank van der Linden
     41  * All rights reserved.
     42  *
     43  * Redistribution and use in source and binary forms, with or without
     44  * modification, are permitted provided that the following conditions
     45  * are met:
     46  * 1. Redistributions of source code must retain the above copyright
     47  *    notice, this list of conditions and the following disclaimer.
     48  * 2. Redistributions in binary form must reproduce the above copyright
     49  *    notice, this list of conditions and the following disclaimer in the
     50  *    documentation and/or other materials provided with the distribution.
     51  * 3. All advertising materials mentioning features or use of this software
     52  *    must display the following acknowledgement:
     53  *      This product includes software developed for the NetBSD Project
     54  *      by Frank van der Linden
     55  * 4. The name of the author may not be used to endorse or promote products
     56  *    derived from this software without specific prior written permission
     57  *
     58  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     59  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     60  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     61  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     62  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     63  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     64  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     65  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     66  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     67  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     68  */
     69 
     70 #include <sys/param.h>
     71 #include <sys/systm.h>
     72 #include <sys/kernel.h>
     73 #include <sys/mount.h>
     74 #include <sys/malloc.h>
     75 #include <sys/conf.h>
     76 
     77 #include <sys/syscallargs.h>
     78 
     79 #include <compat/linux/common/linux_types.h>
     80 #include <compat/linux/common/linux_signal.h>
     81 #include <compat/linux/common/linux_fcntl.h>
     82 #include <compat/linux/common/linux_util.h>
     83 
     84 #include <compat/linux/linux_syscallargs.h>
     85 
     86 /* Used on: arm, i386, m68k, mips, ppc, sparc */
     87 /* Not used on: alpha, sparc64 */
     88 
     89 /*
     90  * This appears to be part of a Linux attempt to switch to 64 bits file sizes.
     91  */
     92 int
     93 linux_sys_llseek(p, v, retval)
     94 	struct proc *p;
     95 	void *v;
     96 	register_t *retval;
     97 {
     98 	struct linux_sys_llseek_args /* {
     99 		syscallarg(int) fd;
    100 		syscallarg(uint32_t) ohigh;
    101 		syscallarg(uint32_t) olow;
    102 		syscallarg(caddr_t) res;
    103 		syscallarg(int) whence;
    104 	} */ *uap = v;
    105 	struct sys_lseek_args bla;
    106 	int error;
    107 	off_t off;
    108 
    109 	off = SCARG(uap, olow) | (((off_t) SCARG(uap, ohigh)) << 32);
    110 
    111 	SCARG(&bla, fd) = SCARG(uap, fd);
    112 	SCARG(&bla, offset) = off;
    113 	SCARG(&bla, whence) = SCARG(uap, whence);
    114 
    115 	if ((error = sys_lseek(p, &bla, retval)))
    116 		return error;
    117 
    118 	if ((error = copyout(retval, SCARG(uap, res), sizeof (off_t))))
    119 		return error;
    120 
    121 	retval[0] = 0;
    122 	return 0;
    123 }
    124