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linux_fcntl.h revision 1.12.6.2 
      1 /*	$NetBSD: linux_fcntl.h,v 1.12.6.2 2008/06/02 13:23:02 mjf 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 #ifndef _LINUX_FCNTL_H
     33 #define _LINUX_FCNTL_H
     34 
     35 /*
     36  * The arguments in the flock structure have a different order from the
     37  * BSD structure.
     38  */
     39 
     40 /* read/write mode for open(2) */
     41 #define	LINUX_O_RDONLY		0x0000
     42 #define LINUX_O_WRONLY		0x0001
     43 #define LINUX_O_RDWR		0x0002
     44 #define LINUX_O_ACCMODE		0x0003
     45 
     46 struct linux_flock {
     47 	short       l_type;
     48 	short       l_whence;
     49 	linux_off_t l_start;
     50 	linux_off_t l_len;
     51 	linux_pid_t l_pid;
     52 };
     53 
     54 struct linux_flock64 {
     55 	short       l_type;
     56 	short       l_whence;
     57 	off_t	    l_start;
     58 	off_t	    l_len;
     59 	linux_pid_t l_pid;
     60 };
     61 
     62 #if defined(__i386__)
     63 #include <compat/linux/arch/i386/linux_fcntl.h>
     64 #elif defined(__m68k__)
     65 #include <compat/linux/arch/m68k/linux_fcntl.h>
     66 #elif defined(__alpha__)
     67 #include <compat/linux/arch/alpha/linux_fcntl.h>
     68 #elif defined(__powerpc__)
     69 #include <compat/linux/arch/powerpc/linux_fcntl.h>
     70 #elif defined(__mips__)
     71 #include <compat/linux/arch/mips/linux_fcntl.h>
     72 #elif defined(__arm__)
     73 #include <compat/linux/arch/arm/linux_fcntl.h>
     74 #elif defined(__amd64__)
     75 #include <compat/linux/arch/amd64/linux_fcntl.h>
     76 #else
     77 #error Undefined linux_fcntl.h machine type.
     78 #endif
     79 
     80 /*
     81  * We have to have 4 copies of the code that converts linux fcntl() file
     82  * locking to native form because there are 4 layouts for the structures.
     83  * To avoid replicating code, these defines are used.
     84  *
     85  * The next two functions take care of converting the flock
     86  * structure back and forth between Linux and NetBSD format.
     87  * The only difference in the structures is the order and size of
     88  * the fields, and the 'whence' value.
     89  */
     90 
     91 #define conv_linux_flock(LINUX, FLOCK) \
     92 static void \
     93 bsd_to_##LINUX##_##FLOCK(struct LINUX##_##FLOCK *lfp, const struct flock *bfp) \
     94 	copy_flock(lfp, LINUX_F, bfp, F) \
     95 \
     96 static void \
     97 LINUX##_to_bsd_##FLOCK(struct flock *bfp, const struct LINUX##_##FLOCK *lfp) \
     98 	copy_flock(bfp, F, lfp, LINUX_F)
     99 
    100 #define copy_flock(dst, dst_f, src, src_f) { \
    101 	dst->l_start = src->l_start; \
    102 	dst->l_len = src->l_len; \
    103 	dst->l_pid = src->l_pid; \
    104 	dst->l_whence = src->l_whence; \
    105 	switch (src->l_type) { \
    106 	case src_f##_RDLCK: \
    107 		dst->l_type = dst_f##_RDLCK; \
    108 		break; \
    109 	case src_f##_UNLCK: \
    110 		dst->l_type = dst_f##_UNLCK; \
    111 		break; \
    112 	case src_f##_WRLCK: \
    113 		dst->l_type = dst_f##_WRLCK; \
    114 		break; \
    115 	} \
    116     }
    117 
    118 /*
    119  * These two defines do the work within the sys_fcntl() switch statement.
    120  */
    121 
    122 #define do_linux_getlk(fd, cmd, arg, LINUX, FLOCK) do { \
    123 	struct LINUX##_##FLOCK lfl; \
    124 	struct flock bfl; \
    125 	int fl_error; \
    126 	if ((fl_error = copyin(arg, &lfl, sizeof lfl))) \
    127 		return fl_error; \
    128 	LINUX##_to_bsd_##FLOCK(&bfl, &lfl); \
    129 	fl_error = do_fcntl_lock(fd, F_GETLK, &bfl); \
    130 	if (fl_error) \
    131 		return fl_error; \
    132 	bsd_to_##LINUX##_##FLOCK(&lfl, &bfl); \
    133 	return copyout(&lfl, arg, sizeof lfl); \
    134     } while (0)
    135 
    136 #define do_linux_setlk(fd, cmd, arg, LINUX, FLOCK, setlk) do { \
    137 	struct LINUX##_##FLOCK lfl; \
    138 	struct flock bfl; \
    139 	int fl_error; \
    140 	if ((fl_error = copyin(arg, &lfl, sizeof lfl))) \
    141 		return fl_error; \
    142 	LINUX##_to_bsd_##FLOCK(&bfl, &lfl); \
    143 	return do_fcntl_lock(fd, cmd == setlk ? F_SETLK : F_SETLKW, &bfl); \
    144     } while (0)
    145 
    146 
    147 #endif /* !_LINUX_FCNTL_H */
    148