xnu-1228.9.59.tar.gz

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

/*
 * Copyright (c) 2000-2007 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>

/* We should not be exporting size_t here.  Temporary for gcc bootstrapping. */
#ifndef _SIZE_T
#define _SIZE_T
typedef __darwin_size_t	size_t;
#endif

#ifndef	_MODE_T
typedef	__darwin_mode_t	mode_t;
#define _MODE_T
#endif

#ifndef _OFF_T
typedef __darwin_off_t	off_t;
#define _OFF_T
#endif

#ifndef _PID_T
typedef __darwin_pid_t	pid_t;
#define _PID_T
#endif

/*
 * 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 */
#define	O_SYNC		0x0080		/* synchronous writes */
#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 !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

//#define	O_SYNC  /* ??? POSIX: Write according to synchronized I/O file integrity completion */

#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|FNONBLOCK)
/* bits settable by fcntl(F_SETFL, ...) */
#define	FCNTLFLAGS	(FAPPEND|FASYNC|FFSYNC|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	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 !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#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 */
#define F_READBOOTSTRAP 46              /* Read bootstrap from disk */
#define F_WRITEBOOTSTRAP 47             /* Write bootstrap on disk */
#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 */

#define F_MARKDEPENDENCY 60             /* this process hosts the device supporting the fs backing this fd */

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

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

/* file descriptor flags (F_GETFD, F_SETFD) */
#define	FD_CLOEXEC	1		/* close-on-exec flag */

/* 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-coelesced provisional lock */
#endif

/*
 * [XSI] The values used for l_whence shall be defined as described
 * in <unistd.h>
 */
#ifndef SEEK_SET
#define	SEEK_SET	0	/* set file offset to offset */
#define	SEEK_CUR	1	/* set file offset to current plus offset */
#define	SEEK_END	2	/* set file offset to EOF plus offset */
#endif	/* !SEEK_SET */

/*
 * [XSI] The symbolic names for file modes for use as values of mode_t
 * shall be defined as described in <sys/stat.h>
 */
#ifndef S_IFMT
/* File type */
#define	S_IFMT		0170000		/* [XSI] type of file mask */
#define	S_IFIFO		0010000		/* [XSI] named pipe (fifo) */
#define	S_IFCHR		0020000		/* [XSI] character special */
#define	S_IFDIR		0040000		/* [XSI] directory */
#define	S_IFBLK		0060000		/* [XSI] block special */
#define	S_IFREG		0100000		/* [XSI] regular */
#define	S_IFLNK		0120000		/* [XSI] symbolic link */
#define	S_IFSOCK	0140000		/* [XSI] socket */
#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#define	S_IFWHT		0160000		/* whiteout */
#define S_IFXATTR	0200000		/* extended attribute */
#endif

/* File mode */
/* Read, write, execute/search by owner */
#define	S_IRWXU		0000700		/* [XSI] RWX mask for owner */
#define	S_IRUSR		0000400		/* [XSI] R for owner */
#define	S_IWUSR		0000200		/* [XSI] W for owner */
#define	S_IXUSR		0000100		/* [XSI] X for owner */
/* Read, write, execute/search by group */
#define	S_IRWXG		0000070		/* [XSI] RWX mask for group */
#define	S_IRGRP		0000040		/* [XSI] R for group */
#define	S_IWGRP		0000020		/* [XSI] W for group */
#define	S_IXGRP		0000010		/* [XSI] X for group */
/* Read, write, execute/search by others */
#define	S_IRWXO		0000007		/* [XSI] RWX mask for other */
#define	S_IROTH		0000004		/* [XSI] R for other */
#define	S_IWOTH		0000002		/* [XSI] W for other */
#define	S_IXOTH		0000001		/* [XSI] X for other */

#define	S_ISUID		0004000		/* [XSI] set user id on execution */
#define	S_ISGID		0002000		/* [XSI] set group id on execution */
#define	S_ISVTX		0001000		/* [XSI] directory restrcted delete */

#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#define	S_ISTXT		S_ISVTX		/* sticky bit: not supported */
#define	S_IREAD		S_IRUSR		/* backward compatability */
#define	S_IWRITE	S_IWUSR		/* backward compatability */
#define	S_IEXEC		S_IXUSR		/* backward compatability */
#endif
#endif	/* !S_IFMT */

#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 */
};


#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
/*
 * advisory file read data type -
 * information passed by user to system
 */
struct radvisory {
       off_t   ra_offset;
       int     ra_count;
};

/*
 * detached code signatures data type -
 * information passed by user to system
 * used by F_ADDSIGS
 */
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 user_fsignatures {
	off_t		fs_file_start;
	user_addr_t	fs_blob_start;
	user_size_t	fs_blob_size;
} 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 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.
 */
#pragma pack(4)

struct log2phys {
	unsigned int	l2p_flags;		/* unused so far */
	off_t		l2p_contigbytes;	/* unused so far */
	off_t		l2p_devoffset;	/* 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 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)
#ifndef _FILESEC_T
struct _filesec;
typedef struct _filesec	*filesec_t;
#define _FILESEC_T
#endif
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);
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)
int	openx_np(const char *, int, filesec_t);
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_set_property(filesec_t, filesec_property_t, const void *);
int	filesec_query_property(filesec_t, filesec_property_t, int *);
#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_ */