io/sys/stat.h

   1 /* Copyright (C) 1991-2017 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 /*
  19  *      POSIX Standard: 5.6 File Characteristics        <sys/stat.h>
  20  */
  21
  22 #ifndef _SYS_STAT_H
  23 #define _SYS_STAT_H     1
  24
  25 #include <features.h>
  26
  27 #include <bits/types.h>         /* For __mode_t and __dev_t.  */
  28
  29 #ifdef __USE_XOPEN2K8
  30 # include <bits/types/struct_timespec.h>
  31 #endif
  32
  33 #if defined __USE_XOPEN || defined __USE_XOPEN2K
  34 /* The Single Unix specification says that some more types are
  35    available here.  */
  36
  37 # include <bits/types/time_t.h>
  38
  39 # ifndef __dev_t_defined
  40 typedef __dev_t dev_t;
  41 #  define __dev_t_defined
  42 # endif
  43
  44 # ifndef __gid_t_defined
  45 typedef __gid_t gid_t;
  46 #  define __gid_t_defined
  47 # endif
  48
  49 # ifndef __ino_t_defined
  50 #  ifndef __USE_FILE_OFFSET64
  51 typedef __ino_t ino_t;
  52 #  else
  53 typedef __ino64_t ino_t;
  54 #  endif
  55 #  define __ino_t_defined
  56 # endif
  57
  58 # ifndef __mode_t_defined
  59 typedef __mode_t mode_t;
  60 #  define __mode_t_defined
  61 # endif
  62
  63 # ifndef __nlink_t_defined
  64 typedef __nlink_t nlink_t;
  65 #  define __nlink_t_defined
  66 # endif
  67
  68 # ifndef __off_t_defined
  69 #  ifndef __USE_FILE_OFFSET64
  70 typedef __off_t off_t;
  71 #  else
  72 typedef __off64_t off_t;
  73 #  endif
  74 #  define __off_t_defined
  75 # endif
  76
  77 # ifndef __uid_t_defined
  78 typedef __uid_t uid_t;
  79 #  define __uid_t_defined
  80 # endif
  81 #endif  /* X/Open */
  82
  83 #ifdef __USE_UNIX98
  84 # ifndef __blkcnt_t_defined
  85 #  ifndef __USE_FILE_OFFSET64
  86 typedef __blkcnt_t blkcnt_t;
  87 #  else
  88 typedef __blkcnt64_t blkcnt_t;
  89 #  endif
  90 #  define __blkcnt_t_defined
  91 # endif
  92
  93 # ifndef __blksize_t_defined
  94 typedef __blksize_t blksize_t;
  95 #  define __blksize_t_defined
  96 # endif
  97 #endif  /* Unix98 */
  98
  99 __BEGIN_DECLS
 100
 101 #include <bits/stat.h>
 102
 103 #if defined __USE_MISC || defined __USE_XOPEN
 104 # define S_IFMT         __S_IFMT
 105 # define S_IFDIR        __S_IFDIR
 106 # define S_IFCHR        __S_IFCHR
 107 # define S_IFBLK        __S_IFBLK
 108 # define S_IFREG        __S_IFREG
 109 # ifdef __S_IFIFO
 110 #  define S_IFIFO       __S_IFIFO
 111 # endif
 112 # ifdef __S_IFLNK
 113 #  define S_IFLNK       __S_IFLNK
 114 # endif
 115 # if (defined __USE_MISC || defined __USE_XOPEN_EXTENDED) \
 116      && defined __S_IFSOCK
 117 #  define S_IFSOCK      __S_IFSOCK
 118 # endif
 119 #endif
 120
 121 /* Test macros for file types.  */
 122
 123 #define __S_ISTYPE(mode, mask)  (((mode) & __S_IFMT) == (mask))
 124
 125 #define S_ISDIR(mode)    __S_ISTYPE((mode), __S_IFDIR)
 126 #define S_ISCHR(mode)    __S_ISTYPE((mode), __S_IFCHR)
 127 #define S_ISBLK(mode)    __S_ISTYPE((mode), __S_IFBLK)
 128 #define S_ISREG(mode)    __S_ISTYPE((mode), __S_IFREG)
 129 #ifdef __S_IFIFO
 130 # define S_ISFIFO(mode)  __S_ISTYPE((mode), __S_IFIFO)
 131 #endif
 132 #ifdef __S_IFLNK
 133 # define S_ISLNK(mode)   __S_ISTYPE((mode), __S_IFLNK)
 134 #endif
 135
 136 #if defined __USE_MISC && !defined __S_IFLNK
 137 # define S_ISLNK(mode)  0
 138 #endif
 139
 140 #if (defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K) \
 141     && defined __S_IFSOCK
 142 # define S_ISSOCK(mode) __S_ISTYPE((mode), __S_IFSOCK)
 143 #elif defined __USE_XOPEN2K
 144 # define S_ISSOCK(mode) 0
 145 #endif
 146
 147 /* These are from POSIX.1b.  If the objects are not implemented using separate
 148    distinct file types, the macros always will evaluate to zero.  Unlike the
 149    other S_* macros the following three take a pointer to a `struct stat'
 150    object as the argument.  */
 151 #ifdef  __USE_POSIX199309
 152 # define S_TYPEISMQ(buf) __S_TYPEISMQ(buf)
 153 # define S_TYPEISSEM(buf) __S_TYPEISSEM(buf)
 154 # define S_TYPEISSHM(buf) __S_TYPEISSHM(buf)
 155 #endif
 156
 157
 158 /* Protection bits.  */
 159
 160 #define S_ISUID __S_ISUID       /* Set user ID on execution.  */
 161 #define S_ISGID __S_ISGID       /* Set group ID on execution.  */
 162
 163 #if defined __USE_MISC || defined __USE_XOPEN
 164 /* Save swapped text after use (sticky bit).  This is pretty well obsolete.  */
 165 # define S_ISVTX        __S_ISVTX
 166 #endif
 167
 168 #define S_IRUSR __S_IREAD       /* Read by owner.  */
 169 #define S_IWUSR __S_IWRITE      /* Write by owner.  */
 170 #define S_IXUSR __S_IEXEC       /* Execute by owner.  */
 171 /* Read, write, and execute by owner.  */
 172 #define S_IRWXU (__S_IREAD|__S_IWRITE|__S_IEXEC)
 173
 174 #ifdef __USE_MISC
 175 # define S_IREAD        S_IRUSR
 176 # define S_IWRITE       S_IWUSR
 177 # define S_IEXEC        S_IXUSR
 178 #endif
 179
 180 #define S_IRGRP (S_IRUSR >> 3)  /* Read by group.  */
 181 #define S_IWGRP (S_IWUSR >> 3)  /* Write by group.  */
 182 #define S_IXGRP (S_IXUSR >> 3)  /* Execute by group.  */
 183 /* Read, write, and execute by group.  */
 184 #define S_IRWXG (S_IRWXU >> 3)
 185
 186 #define S_IROTH (S_IRGRP >> 3)  /* Read by others.  */
 187 #define S_IWOTH (S_IWGRP >> 3)  /* Write by others.  */
 188 #define S_IXOTH (S_IXGRP >> 3)  /* Execute by others.  */
 189 /* Read, write, and execute by others.  */
 190 #define S_IRWXO (S_IRWXG >> 3)
 191
 192
 193 #ifdef  __USE_MISC
 194 /* Macros for common mode bit masks.  */
 195 # define ACCESSPERMS (S_IRWXU|S_IRWXG|S_IRWXO) /* 0777 */
 196 # define ALLPERMS (S_ISUID|S_ISGID|S_ISVTX|S_IRWXU|S_IRWXG|S_IRWXO)/* 07777 */
 197 # define DEFFILEMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)/* 0666*/
 198
 199 # define S_BLKSIZE      512     /* Block size for `st_blocks'.  */
 200 #endif
 201
 202
 203 #ifndef __USE_FILE_OFFSET64
 204 /* Get file attributes for FILE and put them in BUF.  */
 205 extern int stat (const char *__restrict __file,
 206                  struct stat *__restrict __buf) __THROW __nonnull ((1, 2));
 207
 208 /* Get file attributes for the file, device, pipe, or socket
 209    that file descriptor FD is open on and put them in BUF.  */
 210 extern int fstat (int __fd, struct stat *__buf) __THROW __nonnull ((2));
 211 #else
 212 # ifdef __REDIRECT_NTH
 213 extern int __REDIRECT_NTH (stat, (const char *__restrict __file,
 214                                   struct stat *__restrict __buf), stat64)
 215      __nonnull ((1, 2));
 216 extern int __REDIRECT_NTH (fstat, (int __fd, struct stat *__buf), fstat64)
 217      __nonnull ((2));
 218 # else
 219 #  define stat stat64
 220 #  define fstat fstat64
 221 # endif
 222 #endif
 223 #ifdef __USE_LARGEFILE64
 224 extern int stat64 (const char *__restrict __file,
 225                    struct stat64 *__restrict __buf) __THROW __nonnull ((1, 2));
 226 extern int fstat64 (int __fd, struct stat64 *__buf) __THROW __nonnull ((2));
 227 #endif
 228
 229 #ifdef __USE_ATFILE
 230 /* Similar to stat, get the attributes for FILE and put them in BUF.
 231    Relative path names are interpreted relative to FD unless FD is
 232    AT_FDCWD.  */
 233 # ifndef __USE_FILE_OFFSET64
 234 extern int fstatat (int __fd, const char *__restrict __file,
 235                     struct stat *__restrict __buf, int __flag)
 236      __THROW __nonnull ((2, 3));
 237 # else
 238 #  ifdef __REDIRECT_NTH
 239 extern int __REDIRECT_NTH (fstatat, (int __fd, const char *__restrict __file,
 240                                      struct stat *__restrict __buf,
 241                                      int __flag),
 242                            fstatat64) __nonnull ((2, 3));
 243 #  else
 244 #   define fstatat fstatat64
 245 #  endif
 246 # endif
 247
 248 # ifdef __USE_LARGEFILE64
 249 extern int fstatat64 (int __fd, const char *__restrict __file,
 250                       struct stat64 *__restrict __buf, int __flag)
 251      __THROW __nonnull ((2, 3));
 252 # endif
 253 #endif
 254
 255 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
 256 # ifndef __USE_FILE_OFFSET64
 257 /* Get file attributes about FILE and put them in BUF.
 258    If FILE is a symbolic link, do not follow it.  */
 259 extern int lstat (const char *__restrict __file,
 260                   struct stat *__restrict __buf) __THROW __nonnull ((1, 2));
 261 # else
 262 #  ifdef __REDIRECT_NTH
 263 extern int __REDIRECT_NTH (lstat,
 264                            (const char *__restrict __file,
 265                             struct stat *__restrict __buf), lstat64)
 266      __nonnull ((1, 2));
 267 #  else
 268 #   define lstat lstat64
 269 #  endif
 270 # endif
 271 # ifdef __USE_LARGEFILE64
 272 extern int lstat64 (const char *__restrict __file,
 273                     struct stat64 *__restrict __buf)
 274      __THROW __nonnull ((1, 2));
 275 # endif
 276 #endif
 277
 278 /* Set file access permissions for FILE to MODE.
 279    If FILE is a symbolic link, this affects its target instead.  */
 280 extern int chmod (const char *__file, __mode_t __mode)
 281      __THROW __nonnull ((1));
 282
 283 #ifdef __USE_MISC
 284 /* Set file access permissions for FILE to MODE.
 285    If FILE is a symbolic link, this affects the link itself
 286    rather than its target.  */
 287 extern int lchmod (const char *__file, __mode_t __mode)
 288      __THROW __nonnull ((1));
 289 #endif
 290
 291 /* Set file access permissions of the file FD is open on to MODE.  */
 292 #if defined __USE_POSIX199309 || defined __USE_XOPEN_EXTENDED
 293 extern int fchmod (int __fd, __mode_t __mode) __THROW;
 294 #endif
 295
 296 #ifdef __USE_ATFILE
 297 /* Set file access permissions of FILE relative to
 298    the directory FD is open on.  */
 299 extern int fchmodat (int __fd, const char *__file, __mode_t __mode,
 300                      int __flag)
 301      __THROW __nonnull ((2)) __wur;
 302 #endif /* Use ATFILE.  */
 303
 304
 305
 306 /* Set the file creation mask of the current process to MASK,
 307    and return the old creation mask.  */
 308 extern __mode_t umask (__mode_t __mask) __THROW;
 309
 310 #ifdef  __USE_GNU
 311 /* Get the current `umask' value without changing it.
 312    This function is only available under the GNU Hurd.  */
 313 extern __mode_t getumask (void) __THROW;
 314 #endif
 315
 316 /* Create a new directory named PATH, with permission bits MODE.  */
 317 extern int mkdir (const char *__path, __mode_t __mode)
 318      __THROW __nonnull ((1));
 319
 320 #ifdef __USE_ATFILE
 321 /* Like mkdir, create a new directory with permission bits MODE.  But
 322    interpret relative PATH names relative to the directory associated
 323    with FD.  */
 324 extern int mkdirat (int __fd, const char *__path, __mode_t __mode)
 325      __THROW __nonnull ((2));
 326 #endif
 327
 328 /* Create a device file named PATH, with permission and special bits MODE
 329    and device number DEV (which can be constructed from major and minor
 330    device numbers with the `makedev' macro above).  */
 331 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
 332 extern int mknod (const char *__path, __mode_t __mode, __dev_t __dev)
 333      __THROW __nonnull ((1));
 334
 335 # ifdef __USE_ATFILE
 336 /* Like mknod, create a new device file with permission bits MODE and
 337    device number DEV.  But interpret relative PATH names relative to
 338    the directory associated with FD.  */
 339 extern int mknodat (int __fd, const char *__path, __mode_t __mode,
 340                     __dev_t __dev) __THROW __nonnull ((2));
 341 # endif
 342 #endif
 343
 344
 345 /* Create a new FIFO named PATH, with permission bits MODE.  */
 346 extern int mkfifo (const char *__path, __mode_t __mode)
 347      __THROW __nonnull ((1));
 348
 349 #ifdef __USE_ATFILE
 350 /* Like mkfifo, create a new FIFO with permission bits MODE.  But
 351    interpret relative PATH names relative to the directory associated
 352    with FD.  */
 353 extern int mkfifoat (int __fd, const char *__path, __mode_t __mode)
 354      __THROW __nonnull ((2));
 355 #endif
 356 \f
 357 #ifdef __USE_ATFILE
 358 /* Set file access and modification times relative to directory file
 359    descriptor.  */
 360 extern int utimensat (int __fd, const char *__path,
 361                       const struct timespec __times[2],
 362                       int __flags)
 363      __THROW __nonnull ((2));
 364 #endif
 365
 366 #ifdef __USE_XOPEN2K8
 367 /* Set file access and modification times of the file associated with FD.  */
 368 extern int futimens (int __fd, const struct timespec __times[2]) __THROW;
 369 #endif
 370 \f
 371 /* To allow the `struct stat' structure and the file type `mode_t'
 372    bits to vary without changing shared library major version number,
 373    the `stat' family of functions and `mknod' are in fact inline
 374    wrappers around calls to `xstat', `fxstat', `lxstat', and `xmknod',
 375    which all take a leading version-number argument designating the
 376    data structure and bits used.  <bits/stat.h> defines _STAT_VER with
 377    the version number corresponding to `struct stat' as defined in
 378    that file; and _MKNOD_VER with the version number corresponding to
 379    the S_IF* macros defined therein.  It is arranged that when not
 380    inlined these function are always statically linked; that way a
 381    dynamically-linked executable always encodes the version number
 382    corresponding to the data structures it uses, so the `x' functions
 383    in the shared library can adapt without needing to recompile all
 384    callers.  */
 385
 386 #ifndef _STAT_VER
 387 # define _STAT_VER      0
 388 #endif
 389 #ifndef _MKNOD_VER
 390 # define _MKNOD_VER     0
 391 #endif
 392
 393 /* Wrappers for stat and mknod system calls.  */
 394 #ifndef __USE_FILE_OFFSET64
 395 extern int __fxstat (int __ver, int __fildes, struct stat *__stat_buf)
 396      __THROW __nonnull ((3));
 397 extern int __xstat (int __ver, const char *__filename,
 398                     struct stat *__stat_buf) __THROW __nonnull ((2, 3));
 399 extern int __lxstat (int __ver, const char *__filename,
 400                      struct stat *__stat_buf) __THROW __nonnull ((2, 3));
 401 extern int __fxstatat (int __ver, int __fildes, const char *__filename,
 402                        struct stat *__stat_buf, int __flag)
 403      __THROW __nonnull ((3, 4));
 404 #else
 405 # ifdef __REDIRECT_NTH
 406 extern int __REDIRECT_NTH (__fxstat, (int __ver, int __fildes,
 407                                       struct stat *__stat_buf), __fxstat64)
 408      __nonnull ((3));
 409 extern int __REDIRECT_NTH (__xstat, (int __ver, const char *__filename,
 410                                      struct stat *__stat_buf), __xstat64)
 411      __nonnull ((2, 3));
 412 extern int __REDIRECT_NTH (__lxstat, (int __ver, const char *__filename,
 413                                       struct stat *__stat_buf), __lxstat64)
 414      __nonnull ((2, 3));
 415 extern int __REDIRECT_NTH (__fxstatat, (int __ver, int __fildes,
 416                                         const char *__filename,
 417                                         struct stat *__stat_buf, int __flag),
 418                            __fxstatat64) __nonnull ((3, 4));
 419
 420 # else
 421 #  define __fxstat __fxstat64
 422 #  define __xstat __xstat64
 423 #  define __lxstat __lxstat64
 424 # endif
 425 #endif
 426
 427 #ifdef __USE_LARGEFILE64
 428 extern int __fxstat64 (int __ver, int __fildes, struct stat64 *__stat_buf)
 429      __THROW __nonnull ((3));
 430 extern int __xstat64 (int __ver, const char *__filename,
 431                       struct stat64 *__stat_buf) __THROW __nonnull ((2, 3));
 432 extern int __lxstat64 (int __ver, const char *__filename,
 433                        struct stat64 *__stat_buf) __THROW __nonnull ((2, 3));
 434 extern int __fxstatat64 (int __ver, int __fildes, const char *__filename,
 435                          struct stat64 *__stat_buf, int __flag)
 436      __THROW __nonnull ((3, 4));
 437 #endif
 438 extern int __xmknod (int __ver, const char *__path, __mode_t __mode,
 439                      __dev_t *__dev) __THROW __nonnull ((2, 4));
 440
 441 extern int __xmknodat (int __ver, int __fd, const char *__path,
 442                        __mode_t __mode, __dev_t *__dev)
 443      __THROW __nonnull ((3, 5));
 444
 445 #ifdef __USE_EXTERN_INLINES
 446 /* Inlined versions of the real stat and mknod functions.  */
 447
 448 __extern_inline int
 449 __NTH (stat (const char *__path, struct stat *__statbuf))
 450 {
 451   return __xstat (_STAT_VER, __path, __statbuf);
 452 }
 453
 454 # if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
 455 __extern_inline int
 456 __NTH (lstat (const char *__path, struct stat *__statbuf))
 457 {
 458   return __lxstat (_STAT_VER, __path, __statbuf);
 459 }
 460 # endif
 461
 462 __extern_inline int
 463 __NTH (fstat (int __fd, struct stat *__statbuf))
 464 {
 465   return __fxstat (_STAT_VER, __fd, __statbuf);
 466 }
 467
 468 # ifdef __USE_ATFILE
 469 __extern_inline int
 470 __NTH (fstatat (int __fd, const char *__filename, struct stat *__statbuf,
 471                 int __flag))
 472 {
 473   return __fxstatat (_STAT_VER, __fd, __filename, __statbuf, __flag);
 474 }
 475 # endif
 476
 477 # ifdef __USE_MISC
 478 __extern_inline int
 479 __NTH (mknod (const char *__path, __mode_t __mode, __dev_t __dev))
 480 {
 481   return __xmknod (_MKNOD_VER, __path, __mode, &__dev);
 482 }
 483 # endif
 484
 485 # ifdef __USE_ATFILE
 486 __extern_inline int
 487 __NTH (mknodat (int __fd, const char *__path, __mode_t __mode,
 488                 __dev_t __dev))
 489 {
 490   return __xmknodat (_MKNOD_VER, __fd, __path, __mode, &__dev);
 491 }
 492 # endif
 493
 494 # if defined __USE_LARGEFILE64 \
 495   && (! defined __USE_FILE_OFFSET64 \
 496       || (defined __REDIRECT_NTH && defined __OPTIMIZE__))
 497 __extern_inline int
 498 __NTH (stat64 (const char *__path, struct stat64 *__statbuf))
 499 {
 500   return __xstat64 (_STAT_VER, __path, __statbuf);
 501 }
 502
 503 #  if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
 504 __extern_inline int
 505 __NTH (lstat64 (const char *__path, struct stat64 *__statbuf))
 506 {
 507   return __lxstat64 (_STAT_VER, __path, __statbuf);
 508 }
 509 #  endif
 510
 511 __extern_inline int
 512 __NTH (fstat64 (int __fd, struct stat64 *__statbuf))
 513 {
 514   return __fxstat64 (_STAT_VER, __fd, __statbuf);
 515 }
 516
 517 #  ifdef __USE_ATFILE
 518 __extern_inline int
 519 __NTH (fstatat64 (int __fd, const char *__filename, struct stat64 *__statbuf,
 520                   int __flag))
 521 {
 522   return __fxstatat64 (_STAT_VER, __fd, __filename, __statbuf, __flag);
 523 }
 524 #  endif
 525
 526 # endif
 527
 528 #endif
 529
 530 __END_DECLS
 531
 532
 533 #endif /* sys/stat.h  */