bsd/sys/fcntl.h

   1 /*
   2  * Copyright (c) 2000-2001 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
  23 /*-
  24  * Copyright (c) 1983, 1990, 1993
  25  *      The Regents of the University of California.  All rights reserved.
  26  * (c) UNIX System Laboratories, Inc.
  27  * All or some portions of this file are derived from material licensed
  28  * to the University of California by American Telephone and Telegraph
  29  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
  30  * the permission of UNIX System Laboratories, Inc.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  *
  60  *      @(#)fcntl.h     8.3 (Berkeley) 1/21/94
  61  */
  62
  63
  64 #ifndef _SYS_FCNTL_H_
  65 #define _SYS_FCNTL_H_
  66
  67 /*
  68  * This file includes the definitions for open and fcntl
  69  * described by POSIX for <fcntl.h>; it also includes
  70  * related kernel definitions.
  71  */
  72
  73 #ifndef KERNEL
  74 #include <sys/types.h>
  75 #endif
  76
  77 /*
  78  * File status flags: these are used by open(2), fcntl(2).
  79  * They are also used (indirectly) in the kernel file structure f_flags,
  80  * which is a superset of the open/fcntl flags.  Open flags and f_flags
  81  * are inter-convertible using OFLAGS(fflags) and FFLAGS(oflags).
  82  * Open/fcntl flags begin with O_; kernel-internal flags begin with F.
  83  */
  84 /* open-only flags */
  85 #define O_RDONLY        0x0000          /* open for reading only */
  86 #define O_WRONLY        0x0001          /* open for writing only */
  87 #define O_RDWR          0x0002          /* open for reading and writing */
  88 #define O_ACCMODE       0x0003          /* mask for above modes */
  89
  90 /*
  91  * Kernel encoding of open mode; separate read and write bits that are
  92  * independently testable: 1 greater than the above.
  93  *
  94  * XXX
  95  * FREAD and FWRITE are excluded from the #ifdef KERNEL so that TIOCFLUSH,
  96  * which was documented to use FREAD/FWRITE, continues to work.
  97  */
  98 #ifndef _POSIX_SOURCE
  99 #define FREAD           0x0001
 100 #define FWRITE          0x0002
 101 #endif
 102 #define O_NONBLOCK      0x0004          /* no delay */
 103 #define O_APPEND        0x0008          /* set append mode */
 104 #ifndef _POSIX_SOURCE
 105 #define O_SHLOCK        0x0010          /* open with shared file lock */
 106 #define O_EXLOCK        0x0020          /* open with exclusive file lock */
 107 #define O_ASYNC         0x0040          /* signal pgrp when data ready */
 108 #define O_FSYNC         0x0080          /* synchronous writes */
 109 #define O_NOFOLLOW  0x0100      /* don't follow symlinks */
 110 #endif
 111 #define O_CREAT         0x0200          /* create if nonexistant */
 112 #define O_TRUNC         0x0400          /* truncate to zero length */
 113 #define O_EXCL          0x0800          /* error if already exists */
 114 #ifdef KERNEL
 115 #define FMARK           0x1000          /* mark during gc() */
 116 #define FDEFER          0x2000          /* defer for next gc pass */
 117 #define FHASLOCK        0x4000          /* descriptor holds advisory lock */
 118 #endif
 119
 120 /* defined by POSIX 1003.1; BSD default, so no bit required */
 121 #define O_NOCTTY        0               /* don't assign controlling terminal */
 122
 123 #ifdef KERNEL
 124 /* convert from open() flags to/from fflags; convert O_RD/WR to FREAD/FWRITE */
 125 #define FFLAGS(oflags)  ((oflags) + 1)
 126 #define OFLAGS(fflags)  ((fflags) - 1)
 127
 128 /* bits to save after open */
 129 #define FMASK           (FREAD|FWRITE|FAPPEND|FASYNC|FFSYNC|FNONBLOCK)
 130 /* bits settable by fcntl(F_SETFL, ...) */
 131 #define FCNTLFLAGS      (FAPPEND|FASYNC|FFSYNC|FNONBLOCK)
 132 #endif
 133
 134 /*
 135  * The O_* flags used to have only F* names, which were used in the kernel
 136  * and by fcntl.  We retain the F* names for the kernel f_flags field
 137  * and for backward compatibility for fcntl.
 138  */
 139 #ifndef _POSIX_SOURCE
 140 #define FAPPEND         O_APPEND        /* kernel/compat */
 141 #define FASYNC          O_ASYNC         /* kernel/compat */
 142 #define FFSYNC          O_FSYNC         /* kernel */
 143 #define FNONBLOCK       O_NONBLOCK      /* kernel */
 144 #define FNDELAY         O_NONBLOCK      /* compat */
 145 #define O_NDELAY        O_NONBLOCK      /* compat */
 146 #endif
 147
 148 /*
 149  * Flags used for copyfile(2)
 150  */
 151
 152 #ifndef _POSIX_SOURCE
 153 #define CPF_OVERWRITE 1
 154 #define CPF_IGNORE_MODE 2
 155 #define CPF_MASK (CPF_OVERWRITE|CPF_IGNORE_MODE)
 156 #endif
 157
 158 /*
 159  * Constants used for fcntl(2)
 160  */
 161
 162 /* command values */
 163 #define F_DUPFD         0               /* duplicate file descriptor */
 164 #define F_GETFD         1               /* get file descriptor flags */
 165 #define F_SETFD         2               /* set file descriptor flags */
 166 #define F_GETFL         3               /* get file status flags */
 167 #define F_SETFL         4               /* set file status flags */
 168 #ifndef _POSIX_SOURCE
 169 #define F_GETOWN        5               /* get SIGIO/SIGURG proc/pgrp */
 170 #define F_SETOWN        6               /* set SIGIO/SIGURG proc/pgrp */
 171 #endif
 172 #define F_GETLK         7               /* get record locking information */
 173 #define F_SETLK         8               /* set record locking information */
 174 #define F_SETLKW        9               /* F_SETLK; wait if blocked */
 175 #define F_PREALLOCATE   42              /* Preallocate storage */
 176 #define F_SETSIZE       43              /* Truncate a file without zeroing space */
 177 #define F_RDADVISE      44              /* Issue an advisory read async with no copy to user */
 178 #define F_RDAHEAD       45              /* turn read ahead off/on */
 179 #define F_READBOOTSTRAP 46              /* Read bootstrap from disk */
 180 #define F_WRITEBOOTSTRAP 47             /* Write bootstrap on disk */
 181 #define F_NOCACHE       48              /* turning data caching off/on */
 182 #define F_LOG2PHYS      49              /* file offset to device offset */
 183
 184 /* file descriptor flags (F_GETFD, F_SETFD) */
 185 #define FD_CLOEXEC      1               /* close-on-exec flag */
 186
 187 /* record locking flags (F_GETLK, F_SETLK, F_SETLKW) */
 188 #define F_RDLCK         1               /* shared or read lock */
 189 #define F_UNLCK         2               /* unlock */
 190 #define F_WRLCK         3               /* exclusive or write lock */
 191 #ifdef KERNEL
 192 #define F_WAIT          0x010           /* Wait until lock is granted */
 193 #define F_FLOCK         0x020           /* Use flock(2) semantics for lock */
 194 #define F_POSIX         0x040           /* Use POSIX semantics for lock */
 195 #endif
 196
 197 /* allocate flags (F_PREALLOCATE) */
 198
 199 #define F_ALLOCATECONTIG  0x00000002    /* allocate contigious space */
 200 #define F_ALLOCATEALL     0x00000004    /* allocate all requested space or no space at all */
 201
 202 /* Position Modes (fst_posmode) for F_PREALLOCATE */
 203
 204 #define F_PEOFPOSMODE 3                 /* Make it past all of the SEEK pos modes so that */
 205                                         /* we can keep them in sync should we desire */
 206 #define F_VOLPOSMODE    4               /* specify volume starting postion */
 207
 208 /*
 209  * Advisory file segment locking data type -
 210  * information passed to system by user
 211  */
 212 struct flock {
 213         off_t   l_start;        /* starting offset */
 214         off_t   l_len;          /* len = 0 means until end of file */
 215         pid_t   l_pid;          /* lock owner */
 216         short   l_type;         /* lock type: read/write, etc. */
 217         short   l_whence;       /* type of l_start */
 218 };
 219
 220
 221 /*
 222  * advisory file read data type -
 223  * information passed by user to system
 224  */
 225 struct radvisory {
 226        off_t   ra_offset;
 227        int     ra_count;
 228 };
 229
 230
 231 #ifndef _POSIX_SOURCE
 232 /* lock operations for flock(2) */
 233 #define LOCK_SH         0x01            /* shared file lock */
 234 #define LOCK_EX         0x02            /* exclusive file lock */
 235 #define LOCK_NB         0x04            /* don't block when locking */
 236 #define LOCK_UN         0x08            /* unlock file */
 237 #endif
 238
 239 /*  fstore_t type used by F_DEALLOCATE and F_PREALLOCATE commands */
 240
 241 typedef struct fstore {
 242         u_int32_t fst_flags;    /* IN: flags word */
 243         int     fst_posmode;    /* IN: indicates use of offset field */
 244         off_t   fst_offset;     /* IN: start of the region */
 245         off_t   fst_length;     /* IN: size of the region */
 246         off_t   fst_bytesalloc; /* OUT: number of bytes allocated */
 247 } fstore_t;
 248
 249 /* fbootstraptransfer_t used by F_READBOOTSTRAP and F_WRITEBOOTSTRAP commands */
 250
 251 typedef struct fbootstraptransfer {
 252   off_t fbt_offset;             /* IN: offset to start read/write */
 253   size_t fbt_length;            /* IN: number of bytes to transfer */
 254   void *fbt_buffer;             /* IN: buffer to be read/written */
 255 } fbootstraptransfer_t;
 256
 257 /*
 258  * For F_LOG2PHYS this information is passed back to user
 259  * Currently only devoffset is returned - that is the VOP_BMAP
 260  * result - the disk device address corresponding to the
 261  * current file offset (likely set with an lseek).
 262  *
 263  * The flags could hold an indication of whether the # of
 264  * contiguous bytes reflects the true extent length on disk,
 265  * or is an advisory value that indicates there is at least that
 266  * many bytes contiguous.  For some filesystems it might be too
 267  * inefficient to provide anything beyond the advisory value.
 268  * Flags and contiguous bytes return values are not yet implemented.
 269  * For them the fcntl will nedd to switch from using BMAP to CMAP
 270  * and a per filesystem type flag will be needed to interpret the
 271  * contiguous bytes count result from CMAP.
 272  */
 273 struct log2phys {
 274         u_int32_t       l2p_flags;              /* unused so far */
 275         off_t           l2p_contigbytes;        /* unused so far */
 276         off_t           l2p_devoffset;  /* bytes into device */
 277 };
 278
 279 #ifndef _POSIX_SOURCE
 280 #define O_POPUP    0x80000000   /* force window to popup on open */
 281 #define O_ALERT    0x20000000   /* small, clean popup window */
 282 #endif
 283
 284 #ifndef KERNEL
 285 #include <sys/cdefs.h>
 286
 287 __BEGIN_DECLS
 288 int     open __P((const char *, int, ...));
 289 int     creat __P((const char *, mode_t));
 290 int     fcntl __P((int, int, ...));
 291 #ifndef _POSIX_SOURCE
 292 int     flock __P((int, int));
 293 #endif /* !_POSIX_SOURCE */
 294 __END_DECLS
 295 #endif
 296
 297 #endif /* !_SYS_FCNTL_H_ */