sys/sys/fcntl.h

   1 /*-
   2  * Copyright (c) 1983, 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  * (c) UNIX System Laboratories, Inc.
   5  * All or some portions of this file are derived from material licensed
   6  * to the University of California by American Telephone and Telegraph
   7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   8  * the permission of UNIX System Laboratories, Inc.
   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  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  *      @(#)fcntl.h     8.3 (Berkeley) 1/21/94
  39  * $FreeBSD: src/sys/sys/fcntl.h,v 1.9.2.2 2001/06/03 05:00:10 dillon Exp $
  40  * $DragonFly: src/sys/sys/fcntl.h,v 1.12 2007/06/29 05:12:40 dillon Exp $
  41  */
  42
  43 #ifndef _SYS_FCNTL_H_
  44 #define _SYS_FCNTL_H_
  45
  46 #ifndef _SYS_TYPES_H_
  47 #include <sys/types.h>
  48 #endif
  49
  50 /*
  51  * File status flags: these are used by open(2), fcntl(2).
  52  * They are also used (indirectly) in the kernel file structure f_flags,
  53  * which is a superset of the open/fcntl flags.  Open flags and f_flags
  54  * are inter-convertible using OFLAGS(fflags) and FFLAGS(oflags).
  55  * Open/fcntl flags begin with O_; kernel-internal flags begin with F.
  56  */
  57 /* open-only flags */
  58 #define O_RDONLY        0x0000          /* open for reading only */
  59 #define O_WRONLY        0x0001          /* open for writing only */
  60 #define O_RDWR          0x0002          /* open for reading and writing */
  61 #define O_ACCMODE       0x0003          /* mask for above modes */
  62
  63 /*
  64  * Kernel encoding of open mode; separate read and write bits that are
  65  * independently testable: 1 greater than the above.
  66  *
  67  * XXX
  68  * FREAD and FWRITE are excluded from the #ifdef _KERNEL so that TIOCFLUSH,
  69  * which was documented to use FREAD/FWRITE, continues to work.
  70  */
  71 #ifndef _POSIX_SOURCE
  72 #define FREAD           0x0001
  73 #define FWRITE          0x0002
  74 #endif
  75 #define O_NONBLOCK      0x0004          /* no delay */
  76 #define O_APPEND        0x0008          /* set append mode */
  77 #ifndef _POSIX_SOURCE
  78 #define O_SHLOCK        0x0010          /* open with shared file lock */
  79 #define O_EXLOCK        0x0020          /* open with exclusive file lock */
  80 #define O_ASYNC         0x0040          /* signal pgrp when data ready */
  81 #define O_FSYNC         0x0080          /* synchronous writes */
  82 #define O_NOFOLLOW      0x0100          /* don't follow symlinks */
  83 #endif
  84 #define O_CREAT         0x0200          /* create if nonexistent */
  85 #define O_TRUNC         0x0400          /* truncate to zero length */
  86 #define O_EXCL          0x0800          /* error if already exists */
  87 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  88 #define FMARK           0x1000          /* mark during gc() */
  89 #define FDEFER          0x2000          /* defer for next gc pass */
  90 #define FHASLOCK        0x4000          /* descriptor holds advisory lock */
  91 #endif
  92
  93 /* Defined by POSIX 1003.1; BSD default, but must be distinct from O_RDONLY. */
  94 #define O_NOCTTY        0x8000          /* don't assign controlling terminal */
  95
  96 /* Attempt to bypass the buffer cache */
  97 #define O_DIRECT        0x00010000
  98
  99 #ifdef _KERNEL
 100 #define O_ROOTCRED      0x00020000      /* fp_open */
 101 #endif
 102
 103 #define O_FBLOCKING     0x00040000      /* force blocking I/O */
 104 #define O_FNONBLOCKING  0x00080000      /* force non-blocking I/O */
 105 #define O_FAPPEND       0x00100000      /* force append mode for write */
 106 #define O_FOFFSET       0x00200000      /* force specific offset */
 107 #define O_FSYNCWRITE    0x00400000      /* force synchronous write */
 108 #define O_FASYNCWRITE   0x00800000      /* force asynchronous write */
 109 #define O_FUNBUFFERED   0x01000000      /* force unbuffered (direct) I/O */
 110 #define O_FBUFFERED     0x02000000      /* force buffered I/O */
 111 #define O_MAPONREAD     0x04000000      /* memory map read buffer */
 112
 113 #define O_FMASK         (O_FBLOCKING|O_FNONBLOCKING|O_FAPPEND|O_FOFFSET|\
 114                          O_FSYNCWRITE|O_FASYNCWRITE|O_FUNBUFFERED|O_FBUFFERED|\
 115                          O_MAPONREAD)
 116
 117 #ifdef _KERNEL
 118 /* convert from open() flags to/from fflags; convert O_RD/WR to FREAD/FWRITE */
 119 #define FFLAGS(oflags)  ((oflags) + 1)
 120 #define OFLAGS(fflags)  ((fflags) - 1)
 121
 122 /* bits to save after open */
 123 #define FMASK           (FREAD|FWRITE|FAPPEND|FASYNC|FFSYNC|FNONBLOCK|\
 124                          O_DIRECT|O_MAPONREAD)
 125 /* bits settable by fcntl(F_SETFL, ...) */
 126 #define FCNTLFLAGS      (FAPPEND|FASYNC|FFSYNC|FNONBLOCK|FPOSIXSHM|\
 127                          O_DIRECT|O_MAPONREAD)
 128 #endif
 129
 130 /*
 131  * The O_* flags used to have only F* names, which were used in the kernel
 132  * and by fcntl.  We retain the F* names for the kernel f_flag field
 133  * and for backward compatibility for fcntl.
 134  */
 135 #ifndef _POSIX_SOURCE
 136 #define FAPPEND         O_APPEND        /* kernel/compat */
 137 #define FASYNC          O_ASYNC         /* kernel/compat */
 138 #define FFSYNC          O_FSYNC         /* kernel */
 139 #define FNONBLOCK       O_NONBLOCK      /* kernel */
 140 #define FNDELAY         O_NONBLOCK      /* compat */
 141 #define O_NDELAY        O_NONBLOCK      /* compat */
 142 #endif
 143
 144 /*
 145  * We are out of bits in f_flag (which is a short).  However,
 146  * the flag bits not set in FMASK are only meaningful in the
 147  * initial open syscall.  Those bits can thus be given a
 148  * different meaning for fcntl(2).
 149  */
 150 #ifndef _POSIX_SOURCE
 151
 152 /*
 153  * Set by shm_open(3) to get automatic MAP_ASYNC behavior
 154  * for POSIX shared memory objects (which are otherwise
 155  * implemented as plain files).
 156  */
 157 #define FPOSIXSHM       O_NOFOLLOW
 158 #endif
 159
 160 /*
 161  * Constants used for fcntl(2)
 162  */
 163
 164 /* command values */
 165 #define F_DUPFD         0               /* duplicate file descriptor */
 166 #define F_GETFD         1               /* get file descriptor flags */
 167 #define F_SETFD         2               /* set file descriptor flags */
 168 #define F_GETFL         3               /* get file status flags */
 169 #define F_SETFL         4               /* set file status flags */
 170 #ifndef _POSIX_SOURCE
 171 #define F_GETOWN        5               /* get SIGIO/SIGURG proc/pgrp */
 172 #define F_SETOWN        6               /* set SIGIO/SIGURG proc/pgrp */
 173 #endif
 174 #define F_GETLK         7               /* get record locking information */
 175 #define F_SETLK         8               /* set record locking information */
 176 #define F_SETLKW        9               /* F_SETLK; wait if blocked */
 177
 178 /* file descriptor flags (F_GETFD, F_SETFD) */
 179 #define FD_CLOEXEC      1               /* close-on-exec flag */
 180
 181 /* record locking flags (F_GETLK, F_SETLK, F_SETLKW) */
 182 #define F_RDLCK         1               /* shared or read lock */
 183 #define F_UNLCK         2               /* unlock */
 184 #define F_WRLCK         3               /* exclusive or write lock */
 185 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
 186 #define F_WAIT          0x010           /* Wait until lock is granted */
 187 #define F_UNUSED020     0x020
 188 #define F_POSIX         0x040           /* Use POSIX semantics for lock */
 189 #define F_NOEND         0x080           /* l_len = 0, internally used */
 190 #endif
 191
 192 /*
 193  * Advisory file segment locking data type -
 194  * information passed to system by user
 195  */
 196 struct flock {
 197         off_t   l_start;        /* starting offset */
 198         off_t   l_len;          /* len = 0 means until end of file */
 199         pid_t   l_pid;          /* lock owner */
 200         short   l_type;         /* lock type: read/write, etc. */
 201         short   l_whence;       /* type of l_start */
 202 };
 203
 204 #ifdef _KERNEL
 205 union fcntl_dat {
 206         int             fc_fd;          /* F_DUPFD */
 207         int             fc_cloexec;     /* F_GETFD/F_SETFD */
 208         int             fc_flags;       /* F_GETFL/F_SETFL */
 209         int             fc_owner;       /* F_GETOWN/F_SETOWN */
 210         struct flock    fc_flock;       /* F_GETLK/F_SETLK */
 211 };
 212 #endif /* _KERNEL */
 213
 214
 215 #ifndef _POSIX_SOURCE
 216 /* lock operations for flock(2) */
 217 #define LOCK_SH         0x01            /* shared file lock */
 218 #define LOCK_EX         0x02            /* exclusive file lock */
 219 #define LOCK_NB         0x04            /* don't block when locking */
 220 #define LOCK_UN         0x08            /* unlock file */
 221 #endif
 222
 223 #if !defined(_KERNEL) || defined(_KERNEL_VIRTUAL)
 224 #include <sys/cdefs.h>
 225
 226 __BEGIN_DECLS
 227 int     open (const char *, int, ...);
 228 int     creat (const char *, mode_t);
 229 int     fcntl (int, int, ...);
 230 #ifndef _POSIX_SOURCE
 231 int     flock (int, int);
 232 #endif /* !_POSIX_SOURCE */
 233 __END_DECLS
 234 #endif
 235
 236 #endif /* !_SYS_FCNTL_H_ */