usr/src/boot/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  * 4. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  *      @(#)fcntl.h     8.3 (Berkeley) 1/21/94
  35  * $FreeBSD$
  36  */
  37
  38 #ifndef _SYS_FCNTL_H_
  39 #define _SYS_FCNTL_H_
  40
  41 /*
  42  * This file includes the definitions for open and fcntl
  43  * described by POSIX for <fcntl.h>; it also includes
  44  * related kernel definitions.
  45  */
  46
  47 #include <sys/cdefs.h>
  48 #include <sys/_types.h>
  49
  50 #ifndef _MODE_T_DECLARED
  51 typedef __mode_t        mode_t;
  52 #define _MODE_T_DECLARED
  53 #endif
  54
  55 #ifndef _OFF_T_DECLARED
  56 typedef __off_t         off_t;
  57 #define _OFF_T_DECLARED
  58 #endif
  59
  60 #ifndef _PID_T_DECLARED
  61 typedef __pid_t         pid_t;
  62 #define _PID_T_DECLARED
  63 #endif
  64
  65 /*
  66  * File status flags: these are used by open(2), fcntl(2).
  67  * They are also used (indirectly) in the kernel file structure f_flags,
  68  * which is a superset of the open/fcntl flags.  Open flags and f_flags
  69  * are inter-convertible using OFLAGS(fflags) and FFLAGS(oflags).
  70  * Open/fcntl flags begin with O_; kernel-internal flags begin with F.
  71  */
  72 /* open-only flags */
  73 #define O_RDONLY        0x0000          /* open for reading only */
  74 #define O_WRONLY        0x0001          /* open for writing only */
  75 #define O_RDWR          0x0002          /* open for reading and writing */
  76 #define O_ACCMODE       0x0003          /* mask for above modes */
  77
  78 /*
  79  * Kernel encoding of open mode; separate read and write bits that are
  80  * independently testable: 1 greater than the above.
  81  *
  82  * XXX
  83  * FREAD and FWRITE are excluded from the #ifdef _KERNEL so that TIOCFLUSH,
  84  * which was documented to use FREAD/FWRITE, continues to work.
  85  */
  86 #if __BSD_VISIBLE
  87 #define FREAD           0x0001
  88 #define FWRITE          0x0002
  89 #endif
  90 #define O_NONBLOCK      0x0004          /* no delay */
  91 #define O_APPEND        0x0008          /* set append mode */
  92 #if __BSD_VISIBLE
  93 #define O_SHLOCK        0x0010          /* open with shared file lock */
  94 #define O_EXLOCK        0x0020          /* open with exclusive file lock */
  95 #define O_ASYNC         0x0040          /* signal pgrp when data ready */
  96 #define O_FSYNC         0x0080          /* synchronous writes */
  97 #endif
  98 #define O_SYNC          0x0080          /* POSIX synonym for O_FSYNC */
  99 #if __POSIX_VISIBLE >= 200809
 100 #define O_NOFOLLOW      0x0100          /* don't follow symlinks */
 101 #endif
 102 #define O_CREAT         0x0200          /* create if nonexistent */
 103 #define O_TRUNC         0x0400          /* truncate to zero length */
 104 #define O_EXCL          0x0800          /* error if already exists */
 105 #ifdef _KERNEL
 106 #define FHASLOCK        0x4000          /* descriptor holds advisory lock */
 107 #endif
 108
 109 /* Defined by POSIX 1003.1; BSD default, but must be distinct from O_RDONLY. */
 110 #define O_NOCTTY        0x8000          /* don't assign controlling terminal */
 111
 112 #if __BSD_VISIBLE
 113 /* Attempt to bypass buffer cache */
 114 #define O_DIRECT        0x00010000
 115 #endif
 116
 117 #if __POSIX_VISIBLE >= 200809
 118 #define O_DIRECTORY     0x00020000      /* Fail if not directory */
 119 #define O_EXEC          0x00040000      /* Open for execute only */
 120 #endif
 121 #ifdef  _KERNEL
 122 #define FEXEC           O_EXEC
 123 #endif
 124
 125 #if __POSIX_VISIBLE >= 200809
 126 /* Defined by POSIX 1003.1-2008; BSD default, but reserve for future use. */
 127 #define O_TTY_INIT      0x00080000      /* Restore default termios attributes */
 128
 129 #define O_CLOEXEC       0x00100000
 130 #endif
 131
 132 #if __BSD_VISIBLE
 133 #define O_VERIFY        0x00200000      /* open only after verification */
 134 #endif
 135
 136 /*
 137  * XXX missing O_DSYNC, O_RSYNC.
 138  */
 139
 140 #ifdef _KERNEL
 141
 142 /* Only for devfs d_close() flags. */
 143 #define FLASTCLOSE      O_DIRECTORY
 144 #define FREVOKE         O_VERIFY
 145 /* Only for fo_close() from half-succeeded open */
 146 #define FOPENFAILED     O_TTY_INIT
 147
 148 /* convert from open() flags to/from fflags; convert O_RD/WR to FREAD/FWRITE */
 149 #define FFLAGS(oflags)  ((oflags) & O_EXEC ? (oflags) : (oflags) + 1)
 150 #define OFLAGS(fflags)  ((fflags) & O_EXEC ? (fflags) : (fflags) - 1)
 151
 152 /* bits to save after open */
 153 #define FMASK   (FREAD|FWRITE|FAPPEND|FASYNC|FFSYNC|FNONBLOCK|O_DIRECT|FEXEC)
 154 /* bits settable by fcntl(F_SETFL, ...) */
 155 #define FCNTLFLAGS      (FAPPEND|FASYNC|FFSYNC|FNONBLOCK|FRDAHEAD|O_DIRECT)
 156
 157 #if defined(COMPAT_FREEBSD7) || defined(COMPAT_FREEBSD6) || \
 158     defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4)
 159 /*
 160  * Set by shm_open(3) in older libc's to get automatic MAP_ASYNC
 161  * behavior for POSIX shared memory objects (which are otherwise
 162  * implemented as plain files).
 163  */
 164 #define FPOSIXSHM       O_NOFOLLOW
 165 #undef FCNTLFLAGS
 166 #define FCNTLFLAGS      (FAPPEND|FASYNC|FFSYNC|FNONBLOCK|FPOSIXSHM|FRDAHEAD| \
 167                          O_DIRECT)
 168 #endif
 169 #endif
 170
 171 /*
 172  * The O_* flags used to have only F* names, which were used in the kernel
 173  * and by fcntl.  We retain the F* names for the kernel f_flag field
 174  * and for backward compatibility for fcntl.  These flags are deprecated.
 175  */
 176 #if __BSD_VISIBLE
 177 #define FAPPEND         O_APPEND        /* kernel/compat */
 178 #define FASYNC          O_ASYNC         /* kernel/compat */
 179 #define FFSYNC          O_FSYNC         /* kernel */
 180 #define FNONBLOCK       O_NONBLOCK      /* kernel */
 181 #define FNDELAY         O_NONBLOCK      /* compat */
 182 #define O_NDELAY        O_NONBLOCK      /* compat */
 183 #endif
 184
 185 /*
 186  * We are out of bits in f_flag (which is a short).  However,
 187  * the flag bits not set in FMASK are only meaningful in the
 188  * initial open syscall.  Those bits can thus be given a
 189  * different meaning for fcntl(2).
 190  */
 191 #if __BSD_VISIBLE
 192 /* Read ahead */
 193 #define FRDAHEAD        O_CREAT
 194 #endif
 195
 196 #if __POSIX_VISIBLE >= 200809
 197 /*
 198  * Magic value that specify the use of the current working directory
 199  * to determine the target of relative file paths in the openat() and
 200  * similar syscalls.
 201  */
 202 #define AT_FDCWD                -100
 203
 204 /*
 205  * Miscellaneous flags for the *at() syscalls.
 206  */
 207 #define AT_EACCESS              0x100   /* Check access using effective user and group ID */
 208 #define AT_SYMLINK_NOFOLLOW     0x200   /* Do not follow symbolic links */
 209 #define AT_SYMLINK_FOLLOW       0x400   /* Follow symbolic link */
 210 #define AT_REMOVEDIR            0x800   /* Remove directory instead of file */
 211 #endif
 212
 213 /*
 214  * Constants used for fcntl(2)
 215  */
 216
 217 /* command values */
 218 #define F_DUPFD         0               /* duplicate file descriptor */
 219 #define F_GETFD         1               /* get file descriptor flags */
 220 #define F_SETFD         2               /* set file descriptor flags */
 221 #define F_GETFL         3               /* get file status flags */
 222 #define F_SETFL         4               /* set file status flags */
 223 #if __XSI_VISIBLE || __POSIX_VISIBLE >= 200112
 224 #define F_GETOWN        5               /* get SIGIO/SIGURG proc/pgrp */
 225 #define F_SETOWN        6               /* set SIGIO/SIGURG proc/pgrp */
 226 #endif
 227 #if __BSD_VISIBLE
 228 #define F_OGETLK        7               /* get record locking information */
 229 #define F_OSETLK        8               /* set record locking information */
 230 #define F_OSETLKW       9               /* F_SETLK; wait if blocked */
 231 #define F_DUP2FD        10              /* duplicate file descriptor to arg */
 232 #endif
 233 #define F_GETLK         11              /* get record locking information */
 234 #define F_SETLK         12              /* set record locking information */
 235 #define F_SETLKW        13              /* F_SETLK; wait if blocked */
 236 #if __BSD_VISIBLE
 237 #define F_SETLK_REMOTE  14              /* debugging support for remote locks */
 238 #define F_READAHEAD     15              /* read ahead */
 239 #define F_RDAHEAD       16              /* Darwin compatible read ahead */
 240 #endif
 241 #if __POSIX_VISIBLE >= 200809
 242 #define F_DUPFD_CLOEXEC 17              /* Like F_DUPFD, but FD_CLOEXEC is set */
 243 #endif
 244 #if __BSD_VISIBLE
 245 #define F_DUP2FD_CLOEXEC 18             /* Like F_DUP2FD, but FD_CLOEXEC is set */
 246 #endif
 247
 248 /* file descriptor flags (F_GETFD, F_SETFD) */
 249 #define FD_CLOEXEC      1               /* close-on-exec flag */
 250
 251 /* record locking flags (F_GETLK, F_SETLK, F_SETLKW) */
 252 #define F_RDLCK         1               /* shared or read lock */
 253 #define F_UNLCK         2               /* unlock */
 254 #define F_WRLCK         3               /* exclusive or write lock */
 255 #if __BSD_VISIBLE
 256 #define F_UNLCKSYS      4               /* purge locks for a given system ID */
 257 #define F_CANCEL        5               /* cancel an async lock request */
 258 #endif
 259 #ifdef _KERNEL
 260 #define F_WAIT          0x010           /* Wait until lock is granted */
 261 #define F_FLOCK         0x020           /* Use flock(2) semantics for lock */
 262 #define F_POSIX         0x040           /* Use POSIX semantics for lock */
 263 #define F_REMOTE        0x080           /* Lock owner is remote NFS client */
 264 #define F_NOINTR        0x100           /* Ignore signals when waiting */
 265 #endif
 266
 267 /*
 268  * Advisory file segment locking data type -
 269  * information passed to system by user
 270  */
 271 struct flock {
 272         off_t   l_start;        /* starting offset */
 273         off_t   l_len;          /* len = 0 means until end of file */
 274         pid_t   l_pid;          /* lock owner */
 275         short   l_type;         /* lock type: read/write, etc. */
 276         short   l_whence;       /* type of l_start */
 277         int     l_sysid;        /* remote system id or zero for local */
 278 };
 279
 280 #if __BSD_VISIBLE
 281 /*
 282  * Old advisory file segment locking data type,
 283  * before adding l_sysid.
 284  */
 285 struct __oflock {
 286         off_t   l_start;        /* starting offset */
 287         off_t   l_len;          /* len = 0 means until end of file */
 288         pid_t   l_pid;          /* lock owner */
 289         short   l_type;         /* lock type: read/write, etc. */
 290         short   l_whence;       /* type of l_start */
 291 };
 292 #endif
 293
 294 #if __BSD_VISIBLE
 295 /* lock operations for flock(2) */
 296 #define LOCK_SH         0x01            /* shared file lock */
 297 #define LOCK_EX         0x02            /* exclusive file lock */
 298 #define LOCK_NB         0x04            /* don't block when locking */
 299 #define LOCK_UN         0x08            /* unlock file */
 300 #endif
 301
 302 #if __POSIX_VISIBLE >= 200112
 303 /*
 304  * Advice to posix_fadvise
 305  */
 306 #define POSIX_FADV_NORMAL       0       /* no special treatment */
 307 #define POSIX_FADV_RANDOM       1       /* expect random page references */
 308 #define POSIX_FADV_SEQUENTIAL   2       /* expect sequential page references */
 309 #define POSIX_FADV_WILLNEED     3       /* will need these pages */
 310 #define POSIX_FADV_DONTNEED     4       /* dont need these pages */
 311 #define POSIX_FADV_NOREUSE      5       /* access data only once */
 312 #endif
 313
 314 #ifndef _KERNEL
 315 __BEGIN_DECLS
 316 int     open(const char *, int, ...);
 317 int     creat(const char *, mode_t);
 318 int     fcntl(int, int, ...);
 319 #if __BSD_VISIBLE
 320 int     flock(int, int);
 321 #endif
 322 #if __POSIX_VISIBLE >= 200809
 323 int     openat(int, const char *, int, ...);
 324 #endif
 325 #if __POSIX_VISIBLE >= 200112
 326 int     posix_fadvise(int, off_t, off_t, int);
 327 int     posix_fallocate(int, off_t, off_t);
 328 #endif
 329 __END_DECLS
 330 #endif
 331
 332 #endif /* !_SYS_FCNTL_H_ */