sysdeps/unix/sysv/linux/bits/fcntl-linux.h

   1 /* O_*, F_*, FD_* bit values for Linux.
   2    Copyright (C) 2001-2015 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _FCNTL_H
  20 # error "Never use <bits/fcntl-linux.h> directly; include <fcntl.h> instead."
  21 #endif
  22
  23 /* This file contains shared definitions between Linux architectures
  24    and is included by <bits/fcntl.h> to declare them.  The various
  25    #ifndef cases allow the architecture specific file to define those
  26    values with different values.
  27
  28    A minimal <bits/fcntl.h> contains just:
  29
  30    struct flock {...}
  31    #ifdef __USE_LARGEFILE64
  32    struct flock64 {...}
  33    #endif
  34    #include <bits/fcntl-linux.h>
  35 */
  36
  37 #ifdef __USE_GNU
  38 # include <bits/uio.h>
  39 #endif
  40
  41 /* open/fcntl.  */
  42 #define O_ACCMODE          0003
  43 #define O_RDONLY             00
  44 #define O_WRONLY             01
  45 #define O_RDWR               02
  46 #ifndef O_CREAT
  47 # define O_CREAT           0100 /* Not fcntl.  */
  48 #endif
  49 #ifndef O_EXCL
  50 # define O_EXCL            0200 /* Not fcntl.  */
  51 #endif
  52 #ifndef O_NOCTTY
  53 # define O_NOCTTY          0400 /* Not fcntl.  */
  54 #endif
  55 #ifndef O_TRUNC
  56 # define O_TRUNC          01000 /* Not fcntl.  */
  57 #endif
  58 #ifndef O_APPEND
  59 # define O_APPEND         02000
  60 #endif
  61 #ifndef O_NONBLOCK
  62 # define O_NONBLOCK       04000
  63 #endif
  64 #ifndef O_NDELAY
  65 # define O_NDELAY       O_NONBLOCK
  66 #endif
  67 #ifndef O_SYNC
  68 # define O_SYNC        04010000
  69 #endif
  70 #define O_FSYNC         O_SYNC
  71 #ifndef O_ASYNC
  72 # define O_ASYNC         020000
  73 #endif
  74 #ifndef __O_LARGEFILE
  75 # define __O_LARGEFILE  0100000
  76 #endif
  77
  78 #ifndef __O_DIRECTORY
  79 # define __O_DIRECTORY  0200000
  80 #endif
  81 #ifndef __O_NOFOLLOW
  82 # define __O_NOFOLLOW   0400000
  83 #endif
  84 #ifndef __O_CLOEXEC
  85 # define __O_CLOEXEC   02000000
  86 #endif
  87 #ifndef __O_DIRECT
  88 # define __O_DIRECT      040000
  89 #endif
  90 #ifndef __O_NOATIME
  91 # define __O_NOATIME   01000000
  92 #endif
  93 #ifndef __O_PATH
  94 # define __O_PATH     010000000
  95 #endif
  96 #ifndef __O_DSYNC
  97 # define __O_DSYNC       010000
  98 #endif
  99 #ifndef __O_TMPFILE
 100 # define __O_TMPFILE   020200000
 101 #endif
 102
 103 #ifndef F_GETLK
 104 # ifndef __USE_FILE_OFFSET64
 105 #  define F_GETLK       5       /* Get record locking info.  */
 106 #  define F_SETLK       6       /* Set record locking info (non-blocking).  */
 107 #  define F_SETLKW      7       /* Set record locking info (blocking).  */
 108 # else
 109 #  define F_GETLK       F_GETLK64  /* Get record locking info.  */
 110 #  define F_SETLK       F_SETLK64  /* Set record locking info (non-blocking).*/
 111 #  define F_SETLKW      F_SETLKW64 /* Set record locking info (blocking).  */
 112 # endif
 113 #endif
 114 #ifndef F_GETLK64
 115 # define F_GETLK64      12      /* Get record locking info.  */
 116 # define F_SETLK64      13      /* Set record locking info (non-blocking).  */
 117 # define F_SETLKW64     14      /* Set record locking info (blocking).  */
 118 #endif
 119
 120 /* open file description locks.
 121
 122    Usually record locks held by a process are released on *any* close and are
 123    not inherited across a fork.
 124
 125    These cmd values will set locks that conflict with process-associated record
 126    locks, but are "owned" by the opened file description, not the process.
 127    This means that they are inherited across fork or clone with CLONE_FILES
 128    like BSD (flock) locks, and they are only released automatically when the
 129    last reference to the the file description against which they were acquired
 130    is put. */
 131 #ifdef __USE_GNU
 132 # define F_OFD_GETLK    36
 133 # define F_OFD_SETLK    37
 134 # define F_OFD_SETLKW   38
 135 #endif
 136
 137 #ifdef __USE_LARGEFILE64
 138 # define O_LARGEFILE __O_LARGEFILE
 139 #endif
 140
 141 #ifdef __USE_XOPEN2K8
 142 # define O_DIRECTORY    __O_DIRECTORY   /* Must be a directory.  */
 143 # define O_NOFOLLOW     __O_NOFOLLOW    /* Do not follow links.  */
 144 # define O_CLOEXEC      __O_CLOEXEC     /* Set close_on_exec.  */
 145 #endif
 146
 147 #ifdef __USE_GNU
 148 # define O_DIRECT       __O_DIRECT      /* Direct disk access.  */
 149 # define O_NOATIME      __O_NOATIME     /* Do not set atime.  */
 150 # define O_PATH         __O_PATH        /* Resolve pathname but do not open file.  */
 151 # define O_TMPFILE      __O_TMPFILE     /* Atomically create nameless file.  */
 152 #endif
 153
 154 /* For now, Linux has no separate synchronicitiy options for read
 155    operations.  We define O_RSYNC therefore as the same as O_SYNC
 156    since this is a superset.  */
 157 #if defined __USE_POSIX199309 || defined __USE_UNIX98
 158 # define O_DSYNC        __O_DSYNC       /* Synchronize data.  */
 159 # if defined __O_RSYNC
 160 #  define O_RSYNC       __O_RSYNC       /* Synchronize read operations.  */
 161 # else
 162 #  define O_RSYNC       O_SYNC          /* Synchronize read operations.  */
 163 # endif
 164 #endif
 165
 166 /* Values for the second argument to `fcntl'.  */
 167 #define F_DUPFD         0       /* Duplicate file descriptor.  */
 168 #define F_GETFD         1       /* Get file descriptor flags.  */
 169 #define F_SETFD         2       /* Set file descriptor flags.  */
 170 #define F_GETFL         3       /* Get file status flags.  */
 171 #define F_SETFL         4       /* Set file status flags.  */
 172
 173 #ifndef __F_SETOWN
 174 # define __F_SETOWN     8
 175 # define __F_GETOWN     9
 176 #endif
 177
 178 #if defined __USE_UNIX98 || defined __USE_XOPEN2K8
 179 # define F_SETOWN       __F_SETOWN /* Get owner (process receiving SIGIO).  */
 180 # define F_GETOWN       __F_GETOWN /* Set owner (process receiving SIGIO).  */
 181 #endif
 182
 183 #ifndef __F_SETSIG
 184 # define __F_SETSIG     10      /* Set number of signal to be sent.  */
 185 # define __F_GETSIG     11      /* Get number of signal to be sent.  */
 186 #endif
 187 #ifndef __F_SETOWN_EX
 188 # define __F_SETOWN_EX  15      /* Get owner (thread receiving SIGIO).  */
 189 # define __F_GETOWN_EX  16      /* Set owner (thread receiving SIGIO).  */
 190 #endif
 191
 192 #ifdef __USE_GNU
 193 # define F_SETSIG       __F_SETSIG      /* Set number of signal to be sent.  */
 194 # define F_GETSIG       __F_GETSIG      /* Get number of signal to be sent.  */
 195 # define F_SETOWN_EX    __F_SETOWN_EX   /* Get owner (thread receiving SIGIO).  */
 196 # define F_GETOWN_EX    __F_GETOWN_EX   /* Set owner (thread receiving SIGIO).  */
 197 #endif
 198
 199 #ifdef __USE_GNU
 200 # define F_SETLEASE     1024    /* Set a lease.  */
 201 # define F_GETLEASE     1025    /* Enquire what lease is active.  */
 202 # define F_NOTIFY       1026    /* Request notifications on a directory.  */
 203 # define F_SETPIPE_SZ   1031    /* Set pipe page size array.  */
 204 # define F_GETPIPE_SZ   1032    /* Set pipe page size array.  */
 205 #endif
 206 #ifdef __USE_XOPEN2K8
 207 # define F_DUPFD_CLOEXEC 1030   /* Duplicate file descriptor with
 208                                    close-on-exit set.  */
 209 #endif
 210
 211 /* For F_[GET|SET]FD.  */
 212 #define FD_CLOEXEC      1       /* Actually anything with low bit set goes */
 213
 214 #ifndef F_RDLCK
 215 /* For posix fcntl() and `l_type' field of a `struct flock' for lockf().  */
 216 # define F_RDLCK                0       /* Read lock.  */
 217 # define F_WRLCK                1       /* Write lock.  */
 218 # define F_UNLCK                2       /* Remove lock.  */
 219 #endif
 220
 221
 222 /* For old implementation of BSD flock.  */
 223 #ifndef F_EXLCK
 224 # define F_EXLCK                4       /* or 3 */
 225 # define F_SHLCK                8       /* or 4 */
 226 #endif
 227
 228 #ifdef __USE_MISC
 229 /* Operations for BSD flock, also used by the kernel implementation.  */
 230 # define LOCK_SH        1       /* Shared lock.  */
 231 # define LOCK_EX        2       /* Exclusive lock.  */
 232 # define LOCK_NB        4       /* Or'd with one of the above to prevent
 233                                    blocking.  */
 234 # define LOCK_UN        8       /* Remove lock.  */
 235 #endif
 236
 237 #ifdef __USE_GNU
 238 # define LOCK_MAND      32      /* This is a mandatory flock:   */
 239 # define LOCK_READ      64      /* ... which allows concurrent read operations.  */
 240 # define LOCK_WRITE     128     /* ... which allows concurrent write operations.  */
 241 # define LOCK_RW        192     /* ... Which allows concurrent read & write operations.  */
 242 #endif
 243
 244 #ifdef __USE_GNU
 245 /* Types of directory notifications that may be requested with F_NOTIFY.  */
 246 # define DN_ACCESS      0x00000001      /* File accessed.  */
 247 # define DN_MODIFY      0x00000002      /* File modified.  */
 248 # define DN_CREATE      0x00000004      /* File created.  */
 249 # define DN_DELETE      0x00000008      /* File removed.  */
 250 # define DN_RENAME      0x00000010      /* File renamed.  */
 251 # define DN_ATTRIB      0x00000020      /* File changed attributes.  */
 252 # define DN_MULTISHOT   0x80000000      /* Don't remove notifier.  */
 253 #endif
 254
 255
 256 #ifdef __USE_GNU
 257 /* Owner types.  */
 258 enum __pid_type
 259   {
 260     F_OWNER_TID = 0,            /* Kernel thread.  */
 261     F_OWNER_PID,                /* Process.  */
 262     F_OWNER_PGRP,               /* Process group.  */
 263     F_OWNER_GID = F_OWNER_PGRP  /* Alternative, obsolete name.  */
 264   };
 265
 266 /* Structure to use with F_GETOWN_EX and F_SETOWN_EX.  */
 267 struct f_owner_ex
 268   {
 269     enum __pid_type type;       /* Owner type of ID.  */
 270     __pid_t pid;                /* ID of owner.  */
 271   };
 272 #endif
 273
 274 /* Define some more compatibility macros to be backward compatible with
 275    BSD systems which did not managed to hide these kernel macros.  */
 276 #ifdef  __USE_MISC
 277 # define FAPPEND        O_APPEND
 278 # define FFSYNC         O_FSYNC
 279 # define FASYNC         O_ASYNC
 280 # define FNONBLOCK      O_NONBLOCK
 281 # define FNDELAY        O_NDELAY
 282 #endif /* Use misc.  */
 283
 284 #ifndef __POSIX_FADV_DONTNEED
 285 #  define __POSIX_FADV_DONTNEED 4
 286 #  define __POSIX_FADV_NOREUSE  5
 287 #endif
 288 /* Advise to `posix_fadvise'.  */
 289 #ifdef __USE_XOPEN2K
 290 # define POSIX_FADV_NORMAL      0 /* No further special treatment.  */
 291 # define POSIX_FADV_RANDOM      1 /* Expect random page references.  */
 292 # define POSIX_FADV_SEQUENTIAL  2 /* Expect sequential page references.  */
 293 # define POSIX_FADV_WILLNEED    3 /* Will need these pages.  */
 294 # define POSIX_FADV_DONTNEED    __POSIX_FADV_DONTNEED /* Don't need these pages.  */
 295 # define POSIX_FADV_NOREUSE     __POSIX_FADV_NOREUSE /* Data will be accessed once.  */
 296 #endif
 297
 298
 299 #ifdef __USE_GNU
 300 /* Flags for SYNC_FILE_RANGE.  */
 301 # define SYNC_FILE_RANGE_WAIT_BEFORE    1 /* Wait upon writeout of all pages
 302                                              in the range before performing the
 303                                              write.  */
 304 # define SYNC_FILE_RANGE_WRITE          2 /* Initiate writeout of all those
 305                                              dirty pages in the range which are
 306                                              not presently under writeback.  */
 307 # define SYNC_FILE_RANGE_WAIT_AFTER     4 /* Wait upon writeout of all pages in
 308                                              the range after performing the
 309                                              write.  */
 310
 311 /* Flags for SPLICE and VMSPLICE.  */
 312 # define SPLICE_F_MOVE          1       /* Move pages instead of copying.  */
 313 # define SPLICE_F_NONBLOCK      2       /* Don't block on the pipe splicing
 314                                            (but we may still block on the fd
 315                                            we splice from/to).  */
 316 # define SPLICE_F_MORE          4       /* Expect more data.  */
 317 # define SPLICE_F_GIFT          8       /* Pages passed in are a gift.  */
 318
 319
 320 /* Flags for fallocate.  */
 321 # define FALLOC_FL_KEEP_SIZE            1 /* Don't extend size of file
 322                                              even if offset + len is
 323                                              greater than file size.  */
 324 # define FALLOC_FL_PUNCH_HOLE           2 /* Create a hole in the file.  */
 325 # define FALLOC_FL_COLLAPSE_RANGE       8 /* Remove a range of a file
 326                                              without leaving a
 327                                              hole.  */
 328 # define FALLOC_FL_ZERO_RANGE           16 /* Convert a range of a
 329                                               file to zeros.  */
 330
 331
 332 /* File handle structure.  */
 333 struct file_handle
 334 {
 335   unsigned int handle_bytes;
 336   int handle_type;
 337   /* File identifier.  */
 338   unsigned char f_handle[0];
 339 };
 340
 341 /* Maximum handle size (for now).  */
 342 # define MAX_HANDLE_SZ  128
 343 #endif
 344
 345 __BEGIN_DECLS
 346
 347 #ifdef __USE_GNU
 348
 349 /* Provide kernel hint to read ahead.  */
 350 extern ssize_t readahead (int __fd, __off64_t __offset, size_t __count)
 351     __THROW;
 352
 353
 354 /* Selective file content synch'ing.
 355
 356    This function is a possible cancellation point and therefore not
 357    marked with __THROW.  */
 358 extern int sync_file_range (int __fd, __off64_t __offset, __off64_t __count,
 359                             unsigned int __flags);
 360
 361
 362 /* Splice address range into a pipe.
 363
 364    This function is a possible cancellation point and therefore not
 365    marked with __THROW.  */
 366 extern ssize_t vmsplice (int __fdout, const struct iovec *__iov,
 367                          size_t __count, unsigned int __flags);
 368
 369 /* Splice two files together.
 370
 371    This function is a possible cancellation point and therefore not
 372    marked with __THROW.  */
 373 extern ssize_t splice (int __fdin, __off64_t *__offin, int __fdout,
 374                        __off64_t *__offout, size_t __len,
 375                        unsigned int __flags);
 376
 377 /* In-kernel implementation of tee for pipe buffers.
 378
 379    This function is a possible cancellation point and therefore not
 380    marked with __THROW.  */
 381 extern ssize_t tee (int __fdin, int __fdout, size_t __len,
 382                     unsigned int __flags);
 383
 384 /* Reserve storage for the data of the file associated with FD.
 385
 386    This function is a possible cancellation point and therefore not
 387    marked with __THROW.  */
 388 # ifndef __USE_FILE_OFFSET64
 389 extern int fallocate (int __fd, int __mode, __off_t __offset, __off_t __len);
 390 # else
 391 #  ifdef __REDIRECT
 392 extern int __REDIRECT (fallocate, (int __fd, int __mode, __off64_t __offset,
 393                                    __off64_t __len),
 394                        fallocate64);
 395 #  else
 396 #   define fallocate fallocate64
 397 #  endif
 398 # endif
 399 # ifdef __USE_LARGEFILE64
 400 extern int fallocate64 (int __fd, int __mode, __off64_t __offset,
 401                         __off64_t __len);
 402 # endif
 403
 404
 405 /* Map file name to file handle.  */
 406 extern int name_to_handle_at (int __dfd, const char *__name,
 407                               struct file_handle *__handle, int *__mnt_id,
 408                               int __flags) __THROW;
 409
 410 /* Open file using the file handle.
 411
 412    This function is a possible cancellation point and therefore not
 413    marked with __THROW.  */
 414 extern int open_by_handle_at (int __mountdirfd, struct file_handle *__handle,
 415                               int __flags);
 416
 417 #endif  /* use GNU */
 418
 419 __END_DECLS