[apple/xnu.git] / bsd / sys / fcntl.h

/*
 * Copyright (c) 2000-2013 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*-
 * Copyright (c) 1983, 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)fcntl.h     8.3 (Berkeley) 1/21/94
 */


#ifndef _SYS_FCNTL_H_
#define _SYS_FCNTL_H_

/*
 * This file includes the definitions for open and fcntl
 * described by POSIX for <fcntl.h>; it also includes
 * related kernel definitions.
 */
#include <sys/_types.h>
#include <sys/cdefs.h>
#ifndef KERNEL
#include <Availability.h>
#endif

/* We should not be exporting size_t here.  Temporary for gcc bootstrapping. */
#include <sys/_types/_size_t.h>
#include <sys/_types/_mode_t.h>
#include <sys/_types/_off_t.h>
#include <sys/_types/_pid_t.h>

/*
 * File status flags: these are used by open(2), fcntl(2).
 * They are also used (indirectly) in the kernel file structure f_flags,
 * which is a superset of the open/fcntl flags.  Open flags and f_flags
 * are inter-convertible using OFLAGS(fflags) and FFLAGS(oflags).
 * Open/fcntl flags begin with O_; kernel-internal flags begin with F.
 */
/* open-only flags */
#define O_RDONLY        0x0000          /* open for reading only */
#define O_WRONLY        0x0001          /* open for writing only */
#define O_RDWR          0x0002          /* open for reading and writing */
#define O_ACCMODE       0x0003          /* mask for above modes */

/*
 * Kernel encoding of open mode; separate read and write bits that are
 * independently testable: 1 greater than the above.
 *
 * XXX
 * FREAD and FWRITE are excluded from the #ifdef KERNEL so that TIOCFLUSH,
 * which was documented to use FREAD/FWRITE, continues to work.
 */
#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#define FREAD           0x0001
#define FWRITE          0x0002
#endif
#define O_NONBLOCK      0x0004          /* no delay */
#define O_APPEND        0x0008          /* set append mode */

#include <sys/_types/_o_sync.h>

#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#define O_SHLOCK        0x0010          /* open with shared file lock */
#define O_EXLOCK        0x0020          /* open with exclusive file lock */
#define O_ASYNC         0x0040          /* signal pgrp when data ready */
#define O_FSYNC         O_SYNC          /* source compatibility: do not use */
#define O_NOFOLLOW  0x0100      /* don't follow symlinks */
#endif /* (_POSIX_C_SOURCE && !_DARWIN_C_SOURCE) */
#define O_CREAT         0x0200          /* create if nonexistant */
#define O_TRUNC         0x0400          /* truncate to zero length */
#define O_EXCL          0x0800          /* error if already exists */
#ifdef KERNEL
#define FMARK           0x1000          /* mark during gc() */
#define FDEFER          0x2000          /* defer for next gc pass */
#define FHASLOCK        0x4000          /* descriptor holds advisory lock */
#endif

#if __DARWIN_C_LEVEL >= 200809L 
/*
 * Descriptor value for the current working directory
 */
#define AT_FDCWD        -2

/*
 * Flags for the at functions
 */
#define AT_EACCESS              0x0010  /* Use effective ids in access check */
#define AT_SYMLINK_NOFOLLOW     0x0020  /* Act on the symlink itself not the target */
#define AT_SYMLINK_FOLLOW       0x0040  /* Act on target of symlink */
#define AT_REMOVEDIR            0x0080  /* Path refers to directory */
#endif

#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#define O_EVTONLY       0x8000          /* descriptor requested for event notifications only */
#endif

#ifdef KERNEL
#define FWASWRITTEN     0x10000         /* descriptor was written */
#endif

#define O_NOCTTY        0x20000         /* don't assign controlling terminal */

#ifdef KERNEL
#define FNOCACHE        0x40000         /* fcntl(F_NOCACHE, 1) */
#define FNORDAHEAD      0x80000         /* fcntl(F_RDAHEAD, 0) */
#endif

#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#define O_DIRECTORY     0x100000
#define O_SYMLINK       0x200000        /* allow open of a symlink */
#endif

#include <sys/_types/_o_dsync.h>

#ifdef KERNEL
#define FNODIRECT       0x800000        /* fcntl(F_NODIRECT, 1) */
#endif

#if __DARWIN_C_LEVEL >= 200809L
#define O_CLOEXEC       0x1000000       /* implicitly set FD_CLOEXEC */
#endif

#ifdef KERNEL
#define FENCRYPTED      0x2000000
#endif

#ifdef KERNEL
#define FSINGLE_WRITER  0x4000000       /* fcntl(F_SINGLE_WRITER, 1) */
#endif

#ifdef KERNEL
#define O_CLOFORK       0x8000000       /* implicitly set FD_CLOFORK */
#endif

/* Data Protection Flags */
#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#define O_DP_GETRAWENCRYPTED    0x0001
#endif


#ifdef KERNEL
/* convert from open() flags to/from fflags; convert O_RD/WR to FREAD/FWRITE */
#define FFLAGS(oflags)  ((oflags) + 1)
#define OFLAGS(fflags)  ((fflags) - 1)

/* bits to save after open */
#define FMASK           (FREAD|FWRITE|FAPPEND|FASYNC|FFSYNC|FFDSYNC|FNONBLOCK)
/* bits settable by fcntl(F_SETFL, ...) */
#define FCNTLFLAGS      (FAPPEND|FASYNC|FFSYNC|FFDSYNC|FNONBLOCK)
#endif

/*
 * The O_* flags used to have only F* names, which were used in the kernel
 * and by fcntl.  We retain the F* names for the kernel f_flags field
 * and for backward compatibility for fcntl.
 */
#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#define FAPPEND         O_APPEND        /* kernel/compat */
#define FASYNC          O_ASYNC         /* kernel/compat */
#define FFSYNC          O_FSYNC         /* kernel */
#define FFDSYNC         O_DSYNC         /* kernel */
#define FNONBLOCK       O_NONBLOCK      /* kernel */
#define FNDELAY         O_NONBLOCK      /* compat */
#define O_NDELAY        O_NONBLOCK      /* compat */
#endif

/*
 * Flags used for copyfile(2)
 */

#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#define CPF_OVERWRITE 1
#define CPF_IGNORE_MODE 2
#define CPF_MASK (CPF_OVERWRITE|CPF_IGNORE_MODE)
#endif

/*
 * Constants used for fcntl(2)
 */

/* command values */
#define F_DUPFD         0               /* duplicate file descriptor */
#define F_GETFD         1               /* get file descriptor flags */
#define F_SETFD         2               /* set file descriptor flags */
#define F_GETFL         3               /* get file status flags */
#define F_SETFL         4               /* set file status flags */
#define F_GETOWN        5               /* get SIGIO/SIGURG proc/pgrp */
#define F_SETOWN        6               /* set SIGIO/SIGURG proc/pgrp */
#define F_GETLK         7               /* get record locking information */
#define F_SETLK         8               /* set record locking information */
#define F_SETLKW        9               /* F_SETLK; wait if blocked */
#if __DARWIN_C_LEVEL >= __DARWIN_C_FULL
#define F_SETLKWTIMEOUT 10              /* F_SETLK; wait if blocked, return on timeout */
#endif /* __DARWIN_C_LEVEL >= __DARWIN_C_FULL */
#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#define F_FLUSH_DATA    40
#define F_CHKCLEAN      41              /* Used for regression test */
#define F_PREALLOCATE   42              /* Preallocate storage */
#define F_SETSIZE       43              /* Truncate a file without zeroing space */     
#define F_RDADVISE      44              /* Issue an advisory read async with no copy to user */
#define F_RDAHEAD       45              /* turn read ahead off/on for this fd */
/*
 * 46,47 used to be F_READBOOTSTRAP and F_WRITEBOOTSTRAP 
 */
#define F_NOCACHE       48              /* turn data caching off/on for this fd */
#define F_LOG2PHYS      49              /* file offset to device offset */
#define F_GETPATH       50              /* return the full path of the fd */
#define F_FULLFSYNC     51              /* fsync + ask the drive to flush to the media */
#define F_PATHPKG_CHECK 52              /* find which component (if any) is a package */
#define F_FREEZE_FS     53              /* "freeze" all fs operations */
#define F_THAW_FS       54              /* "thaw" all fs operations */
#define F_GLOBAL_NOCACHE 55             /* turn data caching off/on (globally) for this file */

#ifdef PRIVATE
#define F_OPENFROM      56              /* SPI: open a file relative to fd (must be a dir) */
#define F_UNLINKFROM    57              /* SPI: open a file relative to fd (must be a dir) */
#define F_CHECK_OPENEVT 58              /* SPI: if a process is marked OPENEVT, or in O_EVTONLY on opens of this vnode */
#endif /* PRIVATE */

#define F_ADDSIGS       59              /* add detached signatures */

#ifdef PRIVATE
/* Deprecated/Removed in 10.9 */
#define F_MARKDEPENDENCY 60             /* this process hosts the device supporting the fs backing this fd */
#endif

#define F_ADDFILESIGS   61              /* add signature from same file (used by dyld for shared libs) */

#define F_NODIRECT      62              /* used in conjunction with F_NOCACHE to indicate that DIRECT, synchonous writes */
                                        /* should not be used (i.e. its ok to temporaily create cached pages) */

#define F_GETPROTECTIONCLASS    63              /* Get the protection class of a file from the EA, returns int */
#define F_SETPROTECTIONCLASS    64              /* Set the protection class of a file for the EA, requires int */

#define F_LOG2PHYS_EXT  65              /* file offset to device offset, extended */

#define F_GETLKPID              66              /* get record locking information, per-process */

/* See F_DUPFD_CLOEXEC below for 67 */

#ifdef PRIVATE
#define F_SETSTATICCONTENT              68              /* 
                                                                                 * indicate to the filesystem/storage driver that the content to be 
                                                                                 * written is usually static.  a nonzero value enables it, 0 disables it.
                                                                                 */
#define F_MOVEDATAEXTENTS       69              /* Swap only the data associated with two files */
#endif

#define F_SETBACKINGSTORE       70      /* Mark the file as being the backing store for another filesystem */
#define F_GETPATH_MTMINFO       71      /* return the full path of the FD, but error in specific mtmd circumstances */

#define F_GETCODEDIR            72      /* Returns the code directory, with associated hashes, to the caller */

#define F_SETNOSIGPIPE          73      /* No SIGPIPE generated on EPIPE */
#define F_GETNOSIGPIPE          74      /* Status of SIGPIPE for this fd */

#define F_TRANSCODEKEY          75      /* For some cases, we need to rewrap the key for AKS/MKB */

#define F_SINGLE_WRITER         76      /* file being written to a by single writer... if throttling enabled, writes */
                                        /* may be broken into smaller chunks with throttling in between */

#define F_GETPROTECTIONLEVEL    77      /* Get the protection version number for this filesystem */

#define F_FINDSIGS              78      /* Add detached code signatures (used by dyld for shared libs) */

#ifdef PRIVATE
#define F_GETDEFAULTPROTLEVEL   79 /* Get the default protection level for the filesystem */
#define F_MAKECOMPRESSED                80 /* Make the file compressed; truncate & toggle BSD bits */
#define F_SET_GREEDY_MODE               81      /* 
                                        * indicate to the filesystem/storage driver that the content to be
                                        * written should be written in greedy mode for additional speed at
                                        * the cost of storage efficiency. A nonzero value enables it, 0 disables it.
                                        */

#define F_SETIOTYPE             82  /* 
                                                         * Use parameters to describe content being written to the FD. See
                                                         * flag definitions below for argument bits.
                                                         */
#endif

#define F_ADDFILESIGS_FOR_DYLD_SIM 83   /* Add signature from same file, only if it is signed by Apple (used by dyld for simulator) */


// FS-specific fcntl()'s numbers begin at 0x00010000 and go up
#define FCNTL_FS_SPECIFIC_BASE  0x00010000

#endif /* (_POSIX_C_SOURCE && !_DARWIN_C_SOURCE) */

#if __DARWIN_C_LEVEL >= 200809L
#define F_DUPFD_CLOEXEC         67      /* mark the dup with FD_CLOEXEC */
#endif

/* file descriptor flags (F_GETFD, F_SETFD) */
#define FD_CLOEXEC      1               /* close-on-exec flag */
#if PRIVATE
#define FD_CLOFORK      2               /* close-on-fork flag */
#endif

/* record locking flags (F_GETLK, F_SETLK, F_SETLKW) */
#define F_RDLCK         1               /* shared or read lock */
#define F_UNLCK         2               /* unlock */
#define F_WRLCK         3               /* exclusive or write lock */
#ifdef KERNEL
#define F_WAIT          0x010           /* Wait until lock is granted */
#define F_FLOCK         0x020           /* Use flock(2) semantics for lock */
#define F_POSIX         0x040           /* Use POSIX semantics for lock */
#define F_PROV          0x080           /* Non-coalesced provisional lock */
#define F_WAKE1_SAFE    0x100           /* its safe to only wake one waiter */
#define F_ABORT         0x200           /* lock attempt aborted (force umount) */
#endif

#if PRIVATE
/* 
 * ISOCHRONOUS attempts to sustain a minimum platform-dependent throughput 
 * for the duration of the I/O delivered to the driver.
 */
#define F_IOTYPE_ISOCHRONOUS 0x0001 
#endif

/*
 * [XSI] The values used for l_whence shall be defined as described
 * in <unistd.h>
 */
#include <sys/_types/_seek_set.h>

/*
 * [XSI] The symbolic names for file modes for use as values of mode_t
 * shall be defined as described in <sys/stat.h>
 */
#include <sys/_types/_s_ifmt.h>

#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
/* allocate flags (F_PREALLOCATE) */

#define F_ALLOCATECONTIG  0x00000002    /* allocate contigious space */
#define F_ALLOCATEALL     0x00000004    /* allocate all requested space or no space at all */

/* Position Modes (fst_posmode) for F_PREALLOCATE */

#define F_PEOFPOSMODE 3                 /* Make it past all of the SEEK pos modes so that */
                                        /* we can keep them in sync should we desire */ 
#define F_VOLPOSMODE    4               /* specify volume starting postion */
#endif /* (_POSIX_C_SOURCE && !_DARWIN_C_SOURCE) */

/*
 * Advisory file segment locking data type -
 * information passed to system by user
 */
struct flock {
        off_t   l_start;        /* starting offset */
        off_t   l_len;          /* len = 0 means until end of file */
        pid_t   l_pid;          /* lock owner */
        short   l_type;         /* lock type: read/write, etc. */
        short   l_whence;       /* type of l_start */
};

#include <sys/_types/_timespec.h>

#if __DARWIN_C_LEVEL >= __DARWIN_C_FULL
/*
 * Advisory file segment locking with time out -
 * Information passed to system by user for F_SETLKWTIMEOUT
 */
struct flocktimeout {
        struct flock    fl;             /* flock passed for file locking */
        struct timespec timeout;        /* timespec struct for timeout */
};
#endif /* __DARWIN_C_LEVEL >= __DARWIN_C_FULL */

#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
/*
 * advisory file read data type -
 * information passed by user to system
 */

#ifdef KERNEL
#pragma pack(4) /* prevent structure padding in kernel */
#endif /* KERNEL */

struct radvisory {
       off_t   ra_offset;
       int     ra_count;
};

#ifdef KERNEL
#pragma pack()
#endif /* KERNEL */

#ifndef KERNEL
/** Information the user passes in to get the codeblobs out of the kernel */
typedef struct fcodeblobs {
        void            *f_cd_hash;
        size_t          f_hash_size;
        void            *f_cd_buffer;
        size_t          f_cd_size;
        unsigned int    *f_out_size;
        int             f_arch;
        int             __padding;
} fcodeblobs_t;
#endif /* KERNEL */

#ifdef KERNEL
typedef struct user32_fcodeblobs {
        user32_addr_t   f_cd_hash;
        user32_size_t   f_hash_size;
        user32_addr_t   f_cd_buffer;
        user32_size_t   f_cd_size;
        user32_addr_t   f_out_size;
        int             f_arch;
} user32_fcodeblobs_t;

/* LP64 version of fcodeblobs */
typedef struct user64_fcodeblobs {
        user64_addr_t   f_cd_hash;
        user64_size_t   f_hash_size;
        user64_addr_t   f_cd_buffer;
        user64_size_t   f_cd_size;
        user64_addr_t   f_out_size;
        int             f_arch;
        int             __padding;
} user64_fcodeblobs_t;

/* kernel version of fcodeblobs */
typedef struct user_fcodeblobs {
        user_addr_t     f_cd_hash;
        user_size_t     f_hash_size;
        user_addr_t     f_cd_buffer;
        user_size_t     f_cd_size;
        user_addr_t     f_out_size;
        int             f_arch;
} user_fcodeblobs_t;
#endif /* KERNEL */

/*
 * detached code signatures data type -
 * information passed by user to system used by F_ADDSIGS and F_ADDFILESIGS.
 * F_ADDFILESIGS is a shortcut for files that contain their own signature and
 * doesn't require mapping of the file in order to load the signature.
 */
typedef struct fsignatures {
        off_t           fs_file_start;
        void            *fs_blob_start;
        size_t          fs_blob_size;
} fsignatures_t;
#ifdef KERNEL
/* LP64 version of fsignatures.  all pointers 
 * grow when we're dealing with a 64-bit process.
 * WARNING - keep in sync with fsignatures
 */

typedef struct user32_fsignatures {
        off_t           fs_file_start;
        user32_addr_t   fs_blob_start;
        user32_size_t   fs_blob_size;
} user32_fsignatures_t;

typedef struct user_fsignatures {
        off_t           fs_file_start;  /* offset of Mach-O image in FAT file */
        user_addr_t     fs_blob_start;  /* F_ADDSIGS: mem address of signature*/
                                        /* F_ADDFILESIGS: offset of signature */
                                        /*                in Mach-O image     */
        user_size_t     fs_blob_size;   /* size of signature blob             */
} user_fsignatures_t;
#endif /* KERNEL */

/* lock operations for flock(2) */
#define LOCK_SH         0x01            /* shared file lock */
#define LOCK_EX         0x02            /* exclusive file lock */
#define LOCK_NB         0x04            /* don't block when locking */
#define LOCK_UN         0x08            /* unlock file */

/*  fstore_t type used by F_DEALLOCATE and F_PREALLOCATE commands */

typedef struct fstore {
        unsigned int fst_flags; /* IN: flags word */
        int     fst_posmode;    /* IN: indicates use of offset field */
        off_t   fst_offset;     /* IN: start of the region */
        off_t   fst_length;     /* IN: size of the region */
        off_t   fst_bytesalloc; /* OUT: number of bytes allocated */
} fstore_t;

/* fbootstraptransfer_t used by F_READBOOTSTRAP and F_WRITEBOOTSTRAP commands */

typedef struct fbootstraptransfer {
  off_t fbt_offset;             /* IN: offset to start read/write */
  size_t fbt_length;          /* IN: number of bytes to transfer */
  void *fbt_buffer;             /* IN: buffer to be read/written */
} fbootstraptransfer_t;

#ifdef KERNEL
/* LP64 version of fbootstraptransfer.  all pointers 
 * grow when we're dealing with a 64-bit process.
 * WARNING - keep in sync with fbootstraptransfer
 */

typedef struct user32_fbootstraptransfer {
  off_t fbt_offset;             /* IN: offset to start read/write */
  user32_size_t fbt_length;          /* IN: number of bytes to transfer */
  user32_addr_t fbt_buffer;             /* IN: buffer to be read/written */
} user32_fbootstraptransfer_t;

typedef struct user_fbootstraptransfer {
  off_t fbt_offset;             /* IN: offset to start read/write */
  user_size_t fbt_length;               /* IN: number of bytes to transfer */
  user_addr_t fbt_buffer;               /* IN: buffer to be read/written */
} user_fbootstraptransfer_t;

#endif // KERNEL

/*
 * For F_LOG2PHYS this information is passed back to user
 * Currently only devoffset is returned - that is the VOP_BMAP
 * result - the disk device address corresponding to the
 * current file offset (likely set with an lseek).
 *
 * The flags could hold an indication of whether the # of 
 * contiguous bytes reflects the true extent length on disk,
 * or is an advisory value that indicates there is at least that
 * many bytes contiguous.  For some filesystems it might be too
 * inefficient to provide anything beyond the advisory value.
 * Flags and contiguous bytes return values are not yet implemented.
 * For them the fcntl will nedd to switch from using BMAP to CMAP
 * and a per filesystem type flag will be needed to interpret the
 * contiguous bytes count result from CMAP.
 *
 * F_LOG2PHYS_EXT is a variant of F_LOG2PHYS that uses a passed in
 * file offset and length instead of the current file offset.
 * F_LOG2PHYS_EXT operates on the same structure as F_LOG2PHYS, but
 * treats it as an in/out.
 */
#pragma pack(4)

struct log2phys {
        unsigned int    l2p_flags;       /* unused so far */
        off_t           l2p_contigbytes; /* F_LOG2PHYS:     unused so far */
                                         /* F_LOG2PHYS_EXT: IN:  number of bytes to be queried */
                                         /*                 OUT: number of contiguous bytes at this position */
        off_t           l2p_devoffset;   /* F_LOG2PHYS:     OUT: bytes into device */
                                         /* F_LOG2PHYS_EXT: IN:  bytes into file */
                                         /*                 OUT: bytes into device */
};

#pragma pack()

#define O_POPUP    0x80000000   /* force window to popup on open */
#define O_ALERT    0x20000000   /* small, clean popup window */

#ifdef PRIVATE
/*
 * SPI: Argument data for F_OPENFROM
 */
struct fopenfrom {
        unsigned int    o_flags;        /* same as open(2) */
        mode_t          o_mode;         /* same as open(2) */
        char *          o_pathname;     /* relative pathname */
};

#ifdef KERNEL
/*
 * LP64 version of fopenfrom.  Memory pointers 
 * grow when we're dealing with a 64-bit process.
 *
 * WARNING - keep in sync with fopenfrom (above)
 */
struct user32_fopenfrom {
        unsigned int    o_flags;
        mode_t          o_mode;
        user32_addr_t   o_pathname;
};

struct user_fopenfrom {
        unsigned int    o_flags;
        mode_t          o_mode;
        user_addr_t     o_pathname;
};
#endif /* KERNEL */

#endif /* PRIVATE */

#endif /* (_POSIX_C_SOURCE && !_DARWIN_C_SOURCE) */

#ifndef KERNEL

#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)

#include <sys/_types/_filesec_t.h>

typedef enum {
        FILESEC_OWNER = 1,
        FILESEC_GROUP = 2,
        FILESEC_UUID = 3,
        FILESEC_MODE = 4,
        FILESEC_ACL = 5,
        FILESEC_GRPUUID = 6,

/* XXX these are private to the implementation */
        FILESEC_ACL_RAW = 100,
        FILESEC_ACL_ALLOCSIZE = 101
} filesec_property_t;

/* XXX backwards compatibility */
#define FILESEC_GUID FILESEC_UUID
#endif /* (_POSIX_C_SOURCE && !_DARWIN_C_SOURCE) */

__BEGIN_DECLS
int     open(const char *, int, ...) __DARWIN_ALIAS_C(open);
#if __DARWIN_C_LEVEL >= 200809L
int     openat(int, const char *, int, ...) __DARWIN_NOCANCEL(openat) __OSX_AVAILABLE_STARTING(__MAC_10_10, __IPHONE_8_0);
#endif
int     creat(const char *, mode_t) __DARWIN_ALIAS_C(creat);
int     fcntl(int, int, ...) __DARWIN_ALIAS_C(fcntl);
#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)

#ifdef PRIVATE
/*
 * These definitions are retained temporarily for compatibility.
 * If you want to use fileports, please use
 *      #include <sys/fileport.h>
 * or
 *      #include <System/sys/fileport.h>
 */
#ifndef _FILEPORT_T
#define _FILEPORT_T
typedef __darwin_mach_port_t fileport_t;
#define FILEPORT_NULL ((fileport_t)0)
#endif /* _FILEPORT_T */

int     fileport_makeport(int, fileport_t*);
int     fileport_makefd(fileport_t);
#endif /* PRIVATE */
int     openx_np(const char *, int, filesec_t);
/* 
 * data-protected non-portable open(2) :
 int open_dprotected_np(user_addr_t path, int flags, int class, int dpflags, int mode)
 */ 
int open_dprotected_np ( const char *, int, int, int, ...);
int     flock(int, int);
filesec_t filesec_init(void);
filesec_t filesec_dup(filesec_t);
void    filesec_free(filesec_t);
int     filesec_get_property(filesec_t, filesec_property_t, void *);
int     filesec_query_property(filesec_t, filesec_property_t, int *);
int     filesec_set_property(filesec_t, filesec_property_t, const void *);
int     filesec_unset_property(filesec_t, filesec_property_t) __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_3_2);
#define _FILESEC_UNSET_PROPERTY ((void *)0)
#define _FILESEC_REMOVE_ACL     ((void *)1)
#endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
__END_DECLS
#endif

#endif /* !_SYS_FCNTL_H_ */