io/sys/stat.h

   1 /* Copyright (C) 1991, 1992, 1995-2007, 2009, 2010, 2012
   2    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 /*
  20  *      POSIX Standard: 5.6 File Characteristics        <sys/stat.h>
  21  */
  22
  23 #ifndef _SYS_STAT_H
  24 #define _SYS_STAT_H     1
  25
  26 #include <features.h>
  27
  28 #include <bits/types.h>         /* For __mode_t and __dev_t.  */
  29
  30 #if defined __USE_XOPEN || defined __USE_XOPEN2K || defined __USE_MISC \
  31          || defined __USE_ATFILE
  32 # if defined __USE_XOPEN || defined __USE_XOPEN2K
  33 #  define __need_time_t
  34 # endif
  35 # if defined __USE_MISC || defined __USE_ATFILE
  36 #  define __need_timespec
  37 # endif
  38 # include <time.h>              /* For time_t resp. timespec.  */
  39 #endif
  40
  41 #if defined __USE_XOPEN || defined __USE_XOPEN2K
  42 /* The Single Unix specification says that some more types are
  43    available here.  */
  44 # ifndef __dev_t_defined
  45 typedef __dev_t dev_t;
  46 #  define __dev_t_defined
  47 # endif
  48
  49 # ifndef __gid_t_defined
  50 typedef __gid_t gid_t;
  51 #  define __gid_t_defined
  52 # endif
  53
  54 # ifndef __ino_t_defined
  55 #  ifndef __USE_FILE_OFFSET64
  56 typedef __ino_t ino_t;
  57 #  else
  58 typedef __ino64_t ino_t;
  59 #  endif
  60 #  define __ino_t_defined
  61 # endif
  62
  63 # ifndef __mode_t_defined
  64 typedef __mode_t mode_t;
  65 #  define __mode_t_defined
  66 # endif
  67
  68 # ifndef __nlink_t_defined
  69 typedef __nlink_t nlink_t;
  70 #  define __nlink_t_defined
  71 # endif
  72
  73 # ifndef __off_t_defined
  74 #  ifndef __USE_FILE_OFFSET64
  75 typedef __off_t off_t;
  76 #  else
  77 typedef __off64_t off_t;
  78 #  endif
  79 #  define __off_t_defined
  80 # endif
  81
  82 # ifndef __uid_t_defined
  83 typedef __uid_t uid_t;
  84 #  define __uid_t_defined
  85 # endif
  86 #endif  /* X/Open */
  87
  88 #ifdef __USE_UNIX98
  89 # ifndef __blkcnt_t_defined
  90 #  ifndef __USE_FILE_OFFSET64
  91 typedef __blkcnt_t blkcnt_t;
  92 #  else
  93 typedef __blkcnt64_t blkcnt_t;
  94 #  endif
  95 #  define __blkcnt_t_defined
  96 # endif
  97
  98 # ifndef __blksize_t_defined
  99 typedef __blksize_t blksize_t;
 100 #  define __blksize_t_defined
 101 # endif
 102 #endif  /* Unix98 */
 103
 104 __BEGIN_DECLS
 105
 106 #include <bits/stat.h>
 107
 108 #if defined __USE_BSD || defined __USE_MISC || defined __USE_XOPEN
 109 # define S_IFMT         __S_IFMT
 110 # define S_IFDIR        __S_IFDIR
 111 # define S_IFCHR        __S_IFCHR
 112 # define S_IFBLK        __S_IFBLK
 113 # define S_IFREG        __S_IFREG
 114 # ifdef __S_IFIFO
 115 #  define S_IFIFO       __S_IFIFO
 116 # endif
 117 # ifdef __S_IFLNK
 118 #  define S_IFLNK       __S_IFLNK
 119 # endif
 120 # if (defined __USE_BSD || defined __USE_MISC || defined __USE_UNIX98) \
 121      && defined __S_IFSOCK
 122 #  define S_IFSOCK      __S_IFSOCK
 123 # endif
 124 #endif
 125
 126 /* Test macros for file types.  */
 127
 128 #define __S_ISTYPE(mode, mask)  (((mode) & __S_IFMT) == (mask))
 129
 130 #define S_ISDIR(mode)    __S_ISTYPE((mode), __S_IFDIR)
 131 #define S_ISCHR(mode)    __S_ISTYPE((mode), __S_IFCHR)
 132 #define S_ISBLK(mode)    __S_ISTYPE((mode), __S_IFBLK)
 133 #define S_ISREG(mode)    __S_ISTYPE((mode), __S_IFREG)
 134 #ifdef __S_IFIFO
 135 # define S_ISFIFO(mode)  __S_ISTYPE((mode), __S_IFIFO)
 136 #endif
 137 #ifdef __S_IFLNK
 138 # define S_ISLNK(mode)   __S_ISTYPE((mode), __S_IFLNK)
 139 #endif
 140
 141 #if defined __USE_BSD && !defined __S_IFLNK
 142 # define S_ISLNK(mode)  0
 143 #endif
 144
 145 #if (defined __USE_BSD || defined __USE_UNIX98 || defined __USE_XOPEN2K) \
 146     && defined __S_IFSOCK
 147 # define S_ISSOCK(mode) __S_ISTYPE((mode), __S_IFSOCK)
 148 #elif defined __USE_XOPEN2K
 149 # define S_ISSOCK(mode) 0
 150 #endif
 151
 152 /* These are from POSIX.1b.  If the objects are not implemented using separate
 153    distinct file types, the macros always will evaluate to zero.  Unlike the
 154    other S_* macros the following three take a pointer to a `struct stat'
 155    object as the argument.  */
 156 #ifdef  __USE_POSIX199309
 157 # define S_TYPEISMQ(buf) __S_TYPEISMQ(buf)
 158 # define S_TYPEISSEM(buf) __S_TYPEISSEM(buf)
 159 # define S_TYPEISSHM(buf) __S_TYPEISSHM(buf)
 160 #endif
 161
 162
 163 /* Protection bits.  */
 164
 165 #define S_ISUID __S_ISUID       /* Set user ID on execution.  */
 166 #define S_ISGID __S_ISGID       /* Set group ID on execution.  */
 167
 168 #if defined __USE_BSD || defined __USE_MISC || defined __USE_XOPEN
 169 /* Save swapped text after use (sticky bit).  This is pretty well obsolete.  */
 170 # define S_ISVTX        __S_ISVTX
 171 #endif
 172
 173 #define S_IRUSR __S_IREAD       /* Read by owner.  */
 174 #define S_IWUSR __S_IWRITE      /* Write by owner.  */
 175 #define S_IXUSR __S_IEXEC       /* Execute by owner.  */
 176 /* Read, write, and execute by owner.  */
 177 #define S_IRWXU (__S_IREAD|__S_IWRITE|__S_IEXEC)
 178
 179 #if defined __USE_MISC && defined __USE_BSD
 180 # define S_IREAD        S_IRUSR
 181 # define S_IWRITE       S_IWUSR
 182 # define S_IEXEC        S_IXUSR
 183 #endif
 184
 185 #define S_IRGRP (S_IRUSR >> 3)  /* Read by group.  */
 186 #define S_IWGRP (S_IWUSR >> 3)  /* Write by group.  */
 187 #define S_IXGRP (S_IXUSR >> 3)  /* Execute by group.  */
 188 /* Read, write, and execute by group.  */
 189 #define S_IRWXG (S_IRWXU >> 3)
 190
 191 #define S_IROTH (S_IRGRP >> 3)  /* Read by others.  */
 192 #define S_IWOTH (S_IWGRP >> 3)  /* Write by others.  */
 193 #define S_IXOTH (S_IXGRP >> 3)  /* Execute by others.  */
 194 /* Read, write, and execute by others.  */
 195 #define S_IRWXO (S_IRWXG >> 3)
 196
 197
 198 #ifdef  __USE_BSD
 199 /* Macros for common mode bit masks.  */
 200 # define ACCESSPERMS (S_IRWXU|S_IRWXG|S_IRWXO) /* 0777 */
 201 # define ALLPERMS (S_ISUID|S_ISGID|S_ISVTX|S_IRWXU|S_IRWXG|S_IRWXO)/* 07777 */
 202 # define DEFFILEMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)/* 0666*/
 203
 204 # define S_BLKSIZE      512     /* Block size for `st_blocks'.  */
 205 #endif
 206
 207
 208 #ifndef __USE_FILE_OFFSET64
 209 /* Get file attributes for FILE and put them in BUF.  */
 210 extern int stat (const char *__restrict __file,
 211                  struct stat *__restrict __buf) __THROW __nonnull ((1, 2));
 212
 213 /* Get file attributes for the file, device, pipe, or socket
 214    that file descriptor FD is open on and put them in BUF.  */
 215 extern int fstat (int __fd, struct stat *__buf) __THROW __nonnull ((2));
 216 #else
 217 # ifdef __REDIRECT_NTH
 218 extern int __REDIRECT_NTH (stat, (const char *__restrict __file,
 219                                   struct stat *__restrict __buf), stat64)
 220      __nonnull ((1, 2));
 221 extern int __REDIRECT_NTH (fstat, (int __fd, struct stat *__buf), fstat64)
 222      __nonnull ((2));
 223 # else
 224 #  define stat stat64
 225 #  define fstat fstat64
 226 # endif
 227 #endif
 228 #ifdef __USE_LARGEFILE64
 229 extern int stat64 (const char *__restrict __file,
 230                    struct stat64 *__restrict __buf) __THROW __nonnull ((1, 2));
 231 extern int fstat64 (int __fd, struct stat64 *__buf) __THROW __nonnull ((2));
 232 #endif
 233
 234 #ifdef __USE_ATFILE
 235 /* Similar to stat, get the attributes for FILE and put them in BUF.
 236    Relative path names are interpreted relative to FD unless FD is
 237    AT_FDCWD.  */
 238 # ifndef __USE_FILE_OFFSET64
 239 extern int fstatat (int __fd, const char *__restrict __file,
 240                     struct stat *__restrict __buf, int __flag)
 241      __THROW __nonnull ((2, 3));
 242 # else
 243 #  ifdef __REDIRECT_NTH
 244 extern int __REDIRECT_NTH (fstatat, (int __fd, const char *__restrict __file,
 245                                      struct stat *__restrict __buf,
 246                                      int __flag),
 247                            fstatat64) __nonnull ((2, 3));
 248 #  else
 249 #   define fstatat fstatat64
 250 #  endif
 251 # endif
 252
 253 # ifdef __USE_LARGEFILE64
 254 extern int fstatat64 (int __fd, const char *__restrict __file,
 255                       struct stat64 *__restrict __buf, int __flag)
 256      __THROW __nonnull ((2, 3));
 257 # endif
 258 #endif
 259
 260 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
 261 # ifndef __USE_FILE_OFFSET64
 262 /* Get file attributes about FILE and put them in BUF.
 263    If FILE is a symbolic link, do not follow it.  */
 264 extern int lstat (const char *__restrict __file,
 265                   struct stat *__restrict __buf) __THROW __nonnull ((1, 2));
 266 # else
 267 #  ifdef __REDIRECT_NTH
 268 extern int __REDIRECT_NTH (lstat,
 269                            (const char *__restrict __file,
 270                             struct stat *__restrict __buf), lstat64)
 271      __nonnull ((1, 2));
 272 #  else
 273 #   define lstat lstat64
 274 #  endif
 275 # endif
 276 # ifdef __USE_LARGEFILE64
 277 extern int lstat64 (const char *__restrict __file,
 278                     struct stat64 *__restrict __buf)
 279      __THROW __nonnull ((1, 2));
 280 # endif
 281 #endif
 282
 283 /* Set file access permissions for FILE to MODE.
 284    If FILE is a symbolic link, this affects its target instead.  */
 285 extern int chmod (const char *__file, __mode_t __mode)
 286      __THROW __nonnull ((1));
 287
 288 #ifdef __USE_BSD
 289 /* Set file access permissions for FILE to MODE.
 290    If FILE is a symbolic link, this affects the link itself
 291    rather than its target.  */
 292 extern int lchmod (const char *__file, __mode_t __mode)
 293      __THROW __nonnull ((1));
 294 #endif
 295
 296 /* Set file access permissions of the file FD is open on to MODE.  */
 297 #if defined __USE_BSD || defined __USE_POSIX
 298 extern int fchmod (int __fd, __mode_t __mode) __THROW;
 299 #endif
 300
 301 #ifdef __USE_ATFILE
 302 /* Set file access permissions of FILE relative to
 303    the directory FD is open on.  */
 304 extern int fchmodat (int __fd, const char *__file, __mode_t __mode,
 305                      int __flag)
 306      __THROW __nonnull ((2)) __wur;
 307 #endif /* Use ATFILE.  */
 308
 309
 310
 311 /* Set the file creation mask of the current process to MASK,
 312    and return the old creation mask.  */
 313 extern __mode_t umask (__mode_t __mask) __THROW;
 314
 315 #ifdef  __USE_GNU
 316 /* Get the current `umask' value without changing it.
 317    This function is only available under the GNU Hurd.  */
 318 extern __mode_t getumask (void) __THROW;
 319 #endif
 320
 321 /* Create a new directory named PATH, with permission bits MODE.  */
 322 extern int mkdir (const char *__path, __mode_t __mode)
 323      __THROW __nonnull ((1));
 324
 325 #ifdef __USE_ATFILE
 326 /* Like mkdir, create a new directory with permission bits MODE.  But
 327    interpret relative PATH names relative to the directory associated
 328    with FD.  */
 329 extern int mkdirat (int __fd, const char *__path, __mode_t __mode)
 330      __THROW __nonnull ((2));
 331 #endif
 332
 333 /* Create a device file named PATH, with permission and special bits MODE
 334    and device number DEV (which can be constructed from major and minor
 335    device numbers with the `makedev' macro above).  */
 336 #if defined __USE_MISC || defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 337 extern int mknod (const char *__path, __mode_t __mode, __dev_t __dev)
 338      __THROW __nonnull ((1));
 339
 340 # ifdef __USE_ATFILE
 341 /* Like mknod, create a new device file with permission bits MODE and
 342    device number DEV.  But interpret relative PATH names relative to
 343    the directory associated with FD.  */
 344 extern int mknodat (int __fd, const char *__path, __mode_t __mode,
 345                     __dev_t __dev) __THROW __nonnull ((2));
 346 # endif
 347 #endif
 348
 349
 350 /* Create a new FIFO named PATH, with permission bits MODE.  */
 351 extern int mkfifo (const char *__path, __mode_t __mode)
 352      __THROW __nonnull ((1));
 353
 354 #ifdef __USE_ATFILE
 355 /* Like mkfifo, create a new FIFO with permission bits MODE.  But
 356    interpret relative PATH names relative to the directory associated
 357    with FD.  */
 358 extern int mkfifoat (int __fd, const char *__path, __mode_t __mode)
 359      __THROW __nonnull ((2));
 360 #endif
 361 \f
 362 #ifdef __USE_ATFILE
 363 /* Set file access and modification times relative to directory file
 364    descriptor.  */
 365 extern int utimensat (int __fd, const char *__path,
 366                       const struct timespec __times[2],
 367                       int __flags)
 368      __THROW __nonnull ((2));
 369 #endif
 370
 371 #ifdef __USE_XOPEN2K8
 372 /* Set file access and modification times of the file associated with FD.  */
 373 extern int futimens (int __fd, const struct timespec __times[2]) __THROW;
 374 #endif
 375 \f
 376 /* To allow the `struct stat' structure and the file type `mode_t'
 377    bits to vary without changing shared library major version number,
 378    the `stat' family of functions and `mknod' are in fact inline
 379    wrappers around calls to `xstat', `fxstat', `lxstat', and `xmknod',
 380    which all take a leading version-number argument designating the
 381    data structure and bits used.  <bits/stat.h> defines _STAT_VER with
 382    the version number corresponding to `struct stat' as defined in
 383    that file; and _MKNOD_VER with the version number corresponding to
 384    the S_IF* macros defined therein.  It is arranged that when not
 385    inlined these function are always statically linked; that way a
 386    dynamically-linked executable always encodes the version number
 387    corresponding to the data structures it uses, so the `x' functions
 388    in the shared library can adapt without needing to recompile all
 389    callers.  */
 390
 391 #ifndef _STAT_VER
 392 # define _STAT_VER      0
 393 #endif
 394 #ifndef _MKNOD_VER
 395 # define _MKNOD_VER     0
 396 #endif
 397
 398 /* Wrappers for stat and mknod system calls.  */
 399 #ifndef __USE_FILE_OFFSET64
 400 extern int __fxstat (int __ver, int __fildes, struct stat *__stat_buf)
 401      __THROW __nonnull ((3));
 402 extern int __xstat (int __ver, const char *__filename,
 403                     struct stat *__stat_buf) __THROW __nonnull ((2, 3));
 404 extern int __lxstat (int __ver, const char *__filename,
 405                      struct stat *__stat_buf) __THROW __nonnull ((2, 3));
 406 extern int __fxstatat (int __ver, int __fildes, const char *__filename,
 407                        struct stat *__stat_buf, int __flag)
 408      __THROW __nonnull ((3, 4));
 409 #else
 410 # ifdef __REDIRECT_NTH
 411 extern int __REDIRECT_NTH (__fxstat, (int __ver, int __fildes,
 412                                       struct stat *__stat_buf), __fxstat64)
 413      __nonnull ((3));
 414 extern int __REDIRECT_NTH (__xstat, (int __ver, const char *__filename,
 415                                      struct stat *__stat_buf), __xstat64)
 416      __nonnull ((2, 3));
 417 extern int __REDIRECT_NTH (__lxstat, (int __ver, const char *__filename,
 418                                       struct stat *__stat_buf), __lxstat64)
 419      __nonnull ((2, 3));
 420 extern int __REDIRECT_NTH (__fxstatat, (int __ver, int __fildes,
 421                                         const char *__filename,
 422                                         struct stat *__stat_buf, int __flag),
 423                            __fxstatat64) __nonnull ((3, 4));
 424
 425 # else
 426 #  define __fxstat __fxstat64
 427 #  define __xstat __xstat64
 428 #  define __lxstat __lxstat64
 429 # endif
 430 #endif
 431
 432 #ifdef __USE_LARGEFILE64
 433 extern int __fxstat64 (int __ver, int __fildes, struct stat64 *__stat_buf)
 434      __THROW __nonnull ((3));
 435 extern int __xstat64 (int __ver, const char *__filename,
 436                       struct stat64 *__stat_buf) __THROW __nonnull ((2, 3));
 437 extern int __lxstat64 (int __ver, const char *__filename,
 438                        struct stat64 *__stat_buf) __THROW __nonnull ((2, 3));
 439 extern int __fxstatat64 (int __ver, int __fildes, const char *__filename,
 440                          struct stat64 *__stat_buf, int __flag)
 441      __THROW __nonnull ((3, 4));
 442 #endif
 443 extern int __xmknod (int __ver, const char *__path, __mode_t __mode,
 444                      __dev_t *__dev) __THROW __nonnull ((2, 4));
 445
 446 extern int __xmknodat (int __ver, int __fd, const char *__path,
 447                        __mode_t __mode, __dev_t *__dev)
 448      __THROW __nonnull ((3, 5));
 449
 450 #if defined __GNUC__ && __GNUC__ >= 2 && defined __USE_EXTERN_INLINES
 451 /* Inlined versions of the real stat and mknod functions.  */
 452
 453 __extern_inline int
 454 __NTH (stat (const char *__path, struct stat *__statbuf))
 455 {
 456   return __xstat (_STAT_VER, __path, __statbuf);
 457 }
 458
 459 # if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 460 __extern_inline int
 461 __NTH (lstat (const char *__path, struct stat *__statbuf))
 462 {
 463   return __lxstat (_STAT_VER, __path, __statbuf);
 464 }
 465 # endif
 466
 467 __extern_inline int
 468 __NTH (fstat (int __fd, struct stat *__statbuf))
 469 {
 470   return __fxstat (_STAT_VER, __fd, __statbuf);
 471 }
 472
 473 # ifdef __USE_ATFILE
 474 __extern_inline int
 475 __NTH (fstatat (int __fd, const char *__filename, struct stat *__statbuf,
 476                 int __flag))
 477 {
 478   return __fxstatat (_STAT_VER, __fd, __filename, __statbuf, __flag);
 479 }
 480 # endif
 481
 482 # if defined __USE_MISC || defined __USE_BSD
 483 __extern_inline int
 484 __NTH (mknod (const char *__path, __mode_t __mode, __dev_t __dev))
 485 {
 486   return __xmknod (_MKNOD_VER, __path, __mode, &__dev);
 487 }
 488 # endif
 489
 490 # ifdef __USE_ATFILE
 491 __extern_inline int
 492 __NTH (mknodat (int __fd, const char *__path, __mode_t __mode,
 493                 __dev_t __dev))
 494 {
 495   return __xmknodat (_MKNOD_VER, __fd, __path, __mode, &__dev);
 496 }
 497 # endif
 498
 499 # if defined __USE_LARGEFILE64 \
 500   && (! defined __USE_FILE_OFFSET64 \
 501       || (defined __REDIRECT_NTH && defined __OPTIMIZE__))
 502 __extern_inline int
 503 __NTH (stat64 (const char *__path, struct stat64 *__statbuf))
 504 {
 505   return __xstat64 (_STAT_VER, __path, __statbuf);
 506 }
 507
 508 #  if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 509 __extern_inline int
 510 __NTH (lstat64 (const char *__path, struct stat64 *__statbuf))
 511 {
 512   return __lxstat64 (_STAT_VER, __path, __statbuf);
 513 }
 514 #  endif
 515
 516 __extern_inline int
 517 __NTH (fstat64 (int __fd, struct stat64 *__statbuf))
 518 {
 519   return __fxstat64 (_STAT_VER, __fd, __statbuf);
 520 }
 521
 522 #  ifdef __USE_ATFILE
 523 __extern_inline int
 524 __NTH (fstatat64 (int __fd, const char *__filename, struct stat64 *__statbuf,
 525                   int __flag))
 526 {
 527   return __fxstatat64 (_STAT_VER, __fd, __filename, __statbuf, __flag);
 528 }
 529 #  endif
 530
 531 # endif
 532
 533 #endif
 534
 535 __END_DECLS
 536
 537
 538 #endif /* sys/stat.h  */