sys/compat/linux/common/linux_fcntl.h

   1 /*      $NetBSD: linux_fcntl.h,v 1.13 2008/03/21 21:54:58 ad 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 */