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 1.6 2004/05/03 16:06:26 joerg Exp $
  41  */
  42
  43 #ifndef _SYS_FCNTL_H_
  44 #define _SYS_FCNTL_H_
  45
  46 /*
  47  * This file includes the definitions for open and fcntl
  48  * described by POSIX for <fcntl.h>; it also includes
  49  * related kernel definitions.
  50  */
  51
  52 #ifndef _KERNEL
  53 #include <sys/types.h>
  54 #endif
  55
  56 /*
  57  * File status flags: these are used by open(2), fcntl(2).
  58  * They are also used (indirectly) in the kernel file structure f_flags,
  59  * which is a superset of the open/fcntl flags.  Open flags and f_flags
  60  * are inter-convertible using OFLAGS(fflags) and FFLAGS(oflags).
  61  * Open/fcntl flags begin with O_; kernel-internal flags begin with F.
  62  */
  63 /* open-only flags */
  64 #define O_RDONLY        0x0000          /* open for reading only */
  65 #define O_WRONLY        0x0001          /* open for writing only */
  66 #define O_RDWR          0x0002          /* open for reading and writing */
  67 #define O_ACCMODE       0x0003          /* mask for above modes */
  68
  69 /*
  70  * Kernel encoding of open mode; separate read and write bits that are
  71  * independently testable: 1 greater than the above.
  72  *
  73  * XXX
  74  * FREAD and FWRITE are excluded from the #ifdef _KERNEL so that TIOCFLUSH,
  75  * which was documented to use FREAD/FWRITE, continues to work.
  76  */
  77 #ifndef _POSIX_SOURCE
  78 #define FREAD           0x0001
  79 #define FWRITE          0x0002
  80 #endif
  81 #define O_NONBLOCK      0x0004          /* no delay */
  82 #define O_APPEND        0x0008          /* set append mode */
  83 #ifndef _POSIX_SOURCE
  84 #define O_SHLOCK        0x0010          /* open with shared file lock */
  85 #define O_EXLOCK        0x0020          /* open with exclusive file lock */
  86 #define O_ASYNC         0x0040          /* signal pgrp when data ready */
  87 #define O_FSYNC         0x0080          /* synchronous writes */
  88 #define O_NOFOLLOW      0x0100          /* don't follow symlinks */
  89 #endif
  90 #define O_CREAT         0x0200          /* create if nonexistent */
  91 #define O_TRUNC         0x0400          /* truncate to zero length */
  92 #define O_EXCL          0x0800          /* error if already exists */
  93 #ifdef _KERNEL
  94 #define FMARK           0x1000          /* mark during gc() */
  95 #define FDEFER          0x2000          /* defer for next gc pass */
  96 #define FHASLOCK        0x4000          /* descriptor holds advisory lock */
  97 #endif
  98
  99 /* Defined by POSIX 1003.1; BSD default, but must be distinct from O_RDONLY. */
 100 #define O_NOCTTY        0x8000          /* don't assign controlling terminal */
 101
 102 /* Attempt to bypass buffer cache */
 103 #define O_DIRECT        0x00010000
 104
 105 #ifdef _KERNEL
 106 #define O_ROOTCRED      0x00020000      /* fp_open */
 107 #endif
 108
 109 #ifdef _KERNEL
 110 /* convert from open() flags to/from fflags; convert O_RD/WR to FREAD/FWRITE */
 111 #define FFLAGS(oflags)  ((oflags) + 1)
 112 #define OFLAGS(fflags)  ((fflags) - 1)
 113
 114 /* bits to save after open */
 115 #define FMASK           (FREAD|FWRITE|FAPPEND|FASYNC|FFSYNC|FNONBLOCK|O_DIRECT)
 116 /* bits settable by fcntl(F_SETFL, ...) */
 117 #define FCNTLFLAGS      (FAPPEND|FASYNC|FFSYNC|FNONBLOCK|FPOSIXSHM|O_DIRECT)
 118 #endif
 119
 120 /*
 121  * The O_* flags used to have only F* names, which were used in the kernel
 122  * and by fcntl.  We retain the F* names for the kernel f_flag field
 123  * and for backward compatibility for fcntl.
 124  */
 125 #ifndef _POSIX_SOURCE
 126 #define FAPPEND         O_APPEND        /* kernel/compat */
 127 #define FASYNC          O_ASYNC         /* kernel/compat */
 128 #define FFSYNC          O_FSYNC         /* kernel */
 129 #define FNONBLOCK       O_NONBLOCK      /* kernel */
 130 #define FNDELAY         O_NONBLOCK      /* compat */
 131 #define O_NDELAY        O_NONBLOCK      /* compat */
 132 #endif
 133
 134 /*
 135  * We are out of bits in f_flag (which is a short).  However,
 136  * the flag bits not set in FMASK are only meaningful in the
 137  * initial open syscall.  Those bits can thus be given a
 138  * different meaning for fcntl(2).
 139  */
 140 #ifndef _POSIX_SOURCE
 141
 142 /*
 143  * Set by shm_open(3) to get automatic MAP_ASYNC behavior
 144  * for POSIX shared memory objects (which are otherwise
 145  * implemented as plain files).
 146  */
 147 #define FPOSIXSHM       O_NOFOLLOW
 148 #endif
 149
 150 /*
 151  * Constants used for fcntl(2)
 152  */
 153
 154 /* command values */
 155 #define F_DUPFD         0               /* duplicate file descriptor */
 156 #define F_GETFD         1               /* get file descriptor flags */
 157 #define F_SETFD         2               /* set file descriptor flags */
 158 #define F_GETFL         3               /* get file status flags */
 159 #define F_SETFL         4               /* set file status flags */
 160 #ifndef _POSIX_SOURCE
 161 #define F_GETOWN        5               /* get SIGIO/SIGURG proc/pgrp */
 162 #define F_SETOWN        6               /* set SIGIO/SIGURG proc/pgrp */
 163 #endif
 164 #define F_GETLK         7               /* get record locking information */
 165 #define F_SETLK         8               /* set record locking information */
 166 #define F_SETLKW        9               /* F_SETLK; wait if blocked */
 167
 168 /* file descriptor flags (F_GETFD, F_SETFD) */
 169 #define FD_CLOEXEC      1               /* close-on-exec flag */
 170
 171 /* record locking flags (F_GETLK, F_SETLK, F_SETLKW) */
 172 #define F_RDLCK         1               /* shared or read lock */
 173 #define F_UNLCK         2               /* unlock */
 174 #define F_WRLCK         3               /* exclusive or write lock */
 175 #ifdef _KERNEL
 176 #define F_WAIT          0x010           /* Wait until lock is granted */
 177 #define F_FLOCK         0x020           /* Use flock(2) semantics for lock */
 178 #define F_POSIX         0x040           /* Use POSIX semantics for lock */
 179 #define F_NOEND         0x080           /* l_len = 0, internally used */
 180 #endif
 181
 182 /*
 183  * Advisory file segment locking data type -
 184  * information passed to system by user
 185  */
 186 struct flock {
 187         off_t   l_start;        /* starting offset */
 188         off_t   l_len;          /* len = 0 means until end of file */
 189         pid_t   l_pid;          /* lock owner */
 190         short   l_type;         /* lock type: read/write, etc. */
 191         short   l_whence;       /* type of l_start */
 192 };
 193
 194 #ifdef _KERNEL
 195 union fcntl_dat {
 196         int             fc_fd;          /* F_DUPFD */
 197         int             fc_cloexec;     /* F_GETFD/F_SETFD */
 198         int             fc_flags;       /* F_GETFL/F_SETFL */
 199         int             fc_owner;       /* F_GETOWN/F_SETOWN */
 200         struct flock    fc_flock;       /* F_GETLK/F_SETLK */
 201 };
 202 #endif /* _KERNEL */
 203
 204
 205 #ifndef _POSIX_SOURCE
 206 /* lock operations for flock(2) */
 207 #define LOCK_SH         0x01            /* shared file lock */
 208 #define LOCK_EX         0x02            /* exclusive file lock */
 209 #define LOCK_NB         0x04            /* don't block when locking */
 210 #define LOCK_UN         0x08            /* unlock file */
 211 #endif
 212
 213
 214 #ifndef _KERNEL
 215 #include <sys/cdefs.h>
 216
 217 __BEGIN_DECLS
 218 int     open (const char *, int, ...);
 219 int     creat (const char *, mode_t);
 220 int     fcntl (int, int, ...);
 221 #ifndef _POSIX_SOURCE
 222 int     flock (int, int);
 223 #endif /* !_POSIX_SOURCE */
 224 __END_DECLS
 225 #endif
 226
 227 #endif /* !_SYS_FCNTL_H_ */