io/sys/stat.h

   1 /* Copyright (C) 1991,1992,1995-2004,2005 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  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_MISC
  31 # if defined __USE_XOPEN || defined __USE_XOPEN2K
  32 #  define __need_time_t
  33 # endif
  34 # ifdef __USE_MISC
  35 #  define __need_timespec
  36 # endif
  37 # include <time.h>              /* For time_t resp. timespec.  */
  38 #endif
  39
  40 #if defined __USE_XOPEN || defined __USE_XOPEN2K
  41 /* The Single Unix specification says that some more types are
  42    available here.  */
  43 # ifndef __dev_t_defined
  44 typedef __dev_t dev_t;
  45 #  define __dev_t_defined
  46 # endif
  47
  48 # ifndef __gid_t_defined
  49 typedef __gid_t gid_t;
  50 #  define __gid_t_defined
  51 # endif
  52
  53 # ifndef __ino_t_defined
  54 #  ifndef __USE_FILE_OFFSET64
  55 typedef __ino_t ino_t;
  56 #  else
  57 typedef __ino64_t ino_t;
  58 #  endif
  59 #  define __ino_t_defined
  60 # endif
  61
  62 # ifndef __mode_t_defined
  63 typedef __mode_t mode_t;
  64 #  define __mode_t_defined
  65 # endif
  66
  67 # ifndef __nlink_t_defined
  68 typedef __nlink_t nlink_t;
  69 #  define __nlink_t_defined
  70 # endif
  71
  72 # ifndef __off_t_defined
  73 #  ifndef __USE_FILE_OFFSET64
  74 typedef __off_t off_t;
  75 #  else
  76 typedef __off64_t off_t;
  77 #  endif
  78 #  define __off_t_defined
  79 # endif
  80
  81 # ifndef __uid_t_defined
  82 typedef __uid_t uid_t;
  83 #  define __uid_t_defined
  84 # endif
  85 #endif  /* X/Open */
  86
  87 #ifdef __USE_UNIX98
  88 # ifndef __blkcnt_t_defined
  89 #  ifndef __USE_FILE_OFFSET64
  90 typedef __blkcnt_t blkcnt_t;
  91 #  else
  92 typedef __blkcnt64_t blkcnt_t;
  93 #  endif
  94 #  define __blkcnt_t_defined
  95 # endif
  96
  97 # ifndef __blksize_t_defined
  98 typedef __blksize_t blksize_t;
  99 #  define __blksize_t_defined
 100 # endif
 101 #endif  /* Unix98 */
 102
 103 __BEGIN_DECLS
 104
 105 #include <bits/stat.h>
 106
 107 #if defined __USE_BSD || defined __USE_MISC || defined __USE_XOPEN
 108 # define S_IFMT         __S_IFMT
 109 # define S_IFDIR        __S_IFDIR
 110 # define S_IFCHR        __S_IFCHR
 111 # define S_IFBLK        __S_IFBLK
 112 # define S_IFREG        __S_IFREG
 113 # ifdef __S_IFIFO
 114 #  define S_IFIFO       __S_IFIFO
 115 # endif
 116 # ifdef __S_IFLNK
 117 #  define S_IFLNK       __S_IFLNK
 118 # endif
 119 # if (defined __USE_BSD || defined __USE_MISC || defined __USE_UNIX98) \
 120      && defined __S_IFSOCK
 121 #  define S_IFSOCK      __S_IFSOCK
 122 # endif
 123 #endif
 124
 125 /* Test macros for file types.  */
 126
 127 #define __S_ISTYPE(mode, mask)  (((mode) & __S_IFMT) == (mask))
 128
 129 #define S_ISDIR(mode)    __S_ISTYPE((mode), __S_IFDIR)
 130 #define S_ISCHR(mode)    __S_ISTYPE((mode), __S_IFCHR)
 131 #define S_ISBLK(mode)    __S_ISTYPE((mode), __S_IFBLK)
 132 #define S_ISREG(mode)    __S_ISTYPE((mode), __S_IFREG)
 133 #ifdef __S_IFIFO
 134 # define S_ISFIFO(mode)  __S_ISTYPE((mode), __S_IFIFO)
 135 #endif
 136 #ifdef __S_IFLNK
 137 # define S_ISLNK(mode)   __S_ISTYPE((mode), __S_IFLNK)
 138 #endif
 139
 140 #if defined __USE_BSD && !defined __S_IFLNK
 141 # define S_ISLNK(mode)  0
 142 #endif
 143
 144 #if (defined __USE_BSD || defined __USE_UNIX98) \
 145     && defined __S_IFSOCK
 146 # define S_ISSOCK(mode) __S_ISTYPE((mode), __S_IFSOCK)
 147 #endif
 148
 149 /* These are from POSIX.1b.  If the objects are not implemented using separate
 150    distinct file types, the macros always will evaluate to zero.  Unlike the
 151    other S_* macros the following three take a pointer to a `struct stat'
 152    object as the argument.  */
 153 #ifdef  __USE_POSIX199309
 154 # define S_TYPEISMQ(buf) __S_TYPEISMQ(buf)
 155 # define S_TYPEISSEM(buf) __S_TYPEISSEM(buf)
 156 # define S_TYPEISSHM(buf) __S_TYPEISSHM(buf)
 157 #endif
 158
 159
 160 /* Protection bits.  */
 161
 162 #define S_ISUID __S_ISUID       /* Set user ID on execution.  */
 163 #define S_ISGID __S_ISGID       /* Set group ID on execution.  */
 164
 165 #if defined __USE_BSD || defined __USE_MISC || defined __USE_XOPEN
 166 /* Save swapped text after use (sticky bit).  This is pretty well obsolete.  */
 167 # define S_ISVTX        __S_ISVTX
 168 #endif
 169
 170 #define S_IRUSR __S_IREAD       /* Read by owner.  */
 171 #define S_IWUSR __S_IWRITE      /* Write by owner.  */
 172 #define S_IXUSR __S_IEXEC       /* Execute by owner.  */
 173 /* Read, write, and execute by owner.  */
 174 #define S_IRWXU (__S_IREAD|__S_IWRITE|__S_IEXEC)
 175
 176 #if defined __USE_MISC && defined __USE_BSD
 177 # define S_IREAD        S_IRUSR
 178 # define S_IWRITE       S_IWUSR
 179 # define S_IEXEC        S_IXUSR
 180 #endif
 181
 182 #define S_IRGRP (S_IRUSR >> 3)  /* Read by group.  */
 183 #define S_IWGRP (S_IWUSR >> 3)  /* Write by group.  */
 184 #define S_IXGRP (S_IXUSR >> 3)  /* Execute by group.  */
 185 /* Read, write, and execute by group.  */
 186 #define S_IRWXG (S_IRWXU >> 3)
 187
 188 #define S_IROTH (S_IRGRP >> 3)  /* Read by others.  */
 189 #define S_IWOTH (S_IWGRP >> 3)  /* Write by others.  */
 190 #define S_IXOTH (S_IXGRP >> 3)  /* Execute by others.  */
 191 /* Read, write, and execute by others.  */
 192 #define S_IRWXO (S_IRWXG >> 3)
 193
 194
 195 #ifdef  __USE_BSD
 196 /* Macros for common mode bit masks.  */
 197 # define ACCESSPERMS (S_IRWXU|S_IRWXG|S_IRWXO) /* 0777 */
 198 # define ALLPERMS (S_ISUID|S_ISGID|S_ISVTX|S_IRWXU|S_IRWXG|S_IRWXO)/* 07777 */
 199 # define DEFFILEMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)/* 0666*/
 200
 201 # define S_BLKSIZE      512     /* Block size for `st_blocks'.  */
 202 #endif
 203
 204
 205 #ifndef __USE_FILE_OFFSET64
 206 /* Get file attributes for FILE and put them in BUF.  */
 207 extern int stat (__const char *__restrict __file,
 208                  struct stat *__restrict __buf) __THROW __nonnull ((1, 2));
 209
 210 /* Get file attributes for the file, device, pipe, or socket
 211    that file descriptor FD is open on and put them in BUF.  */
 212 extern int fstat (int __fd, struct stat *__buf) __THROW __nonnull ((2));
 213 #else
 214 # ifdef __REDIRECT_NTH
 215 extern int __REDIRECT_NTH (stat, (__const char *__restrict __file,
 216                                   struct stat *__restrict __buf), stat64)
 217      __nonnull ((1, 2));
 218 extern int __REDIRECT_NTH (fstat, (int __fd, struct stat *__buf), fstat64)
 219      __nonnull ((2));
 220 # else
 221 #  define stat stat64
 222 #  define fstat fstat64
 223 # endif
 224 #endif
 225 #ifdef __USE_LARGEFILE64
 226 extern int stat64 (__const char *__restrict __file,
 227                    struct stat64 *__restrict __buf) __THROW __nonnull ((1, 2));
 228 extern int fstat64 (int __fd, struct stat64 *__buf) __THROW __nonnull ((2));
 229 #endif
 230
 231 #ifdef __USE_GNU
 232 /* Similar to stat, get the attributes for FILE and put them in BUF.
 233    Relative path names are interpreted relative to FD unless FD is
 234    AT_FDCWD.  */
 235 # ifndef __USE_FILE_OFFSET64
 236 extern int fstatat (int __fd, const char *__file, struct stat *__buf,
 237                     int __flag) __THROW __nonnull ((2, 3));
 238 # else
 239 extern int __REDIRECT_NTH (fstatat, (int __fd, const char *__file,
 240                                      struct stat *__buf, int __flag),
 241                            fstatat64) __nonnull ((2, 3));
 242 # endif
 243
 244 extern int fstatat64 (int __fd, const char *__file, struct stat64 *__buf,
 245                       int __flag) __THROW __nonnull ((2, 3));
 246 #endif
 247
 248 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 249 # ifndef __USE_FILE_OFFSET64
 250 /* Get file attributes about FILE and put them in BUF.
 251    If FILE is a symbolic link, do not follow it.  */
 252 extern int lstat (__const char *__restrict __file,
 253                   struct stat *__restrict __buf) __THROW __nonnull ((1, 2));
 254 # else
 255 #  ifdef __REDIRECT_NTH
 256 extern int __REDIRECT_NTH (lstat,
 257                            (__const char *__restrict __file,
 258                             struct stat *__restrict __buf), lstat64)
 259      __nonnull ((1, 2));
 260 #  else
 261 #   define lstat lstat64
 262 #  endif
 263 # endif
 264 # ifdef __USE_LARGEFILE64
 265 extern int lstat64 (__const char *__restrict __file,
 266                     struct stat64 *__restrict __buf)
 267      __THROW __nonnull ((1, 2));
 268 # endif
 269 #endif
 270
 271 /* Set file access permissions for FILE to MODE.
 272    If FILE is a symbolic link, this affects its target instead.  */
 273 extern int chmod (__const char *__file, __mode_t __mode)
 274      __THROW __nonnull ((1));
 275
 276 #ifdef __USE_BSD
 277 /* Set file access permissions for FILE to MODE.
 278    If FILE is a symbolic link, this affects the link itself
 279    rather than its target.  */
 280 extern int lchmod (__const char *__file, __mode_t __mode)
 281      __THROW __nonnull ((1));
 282 #endif
 283
 284 /* Set file access permissions of the file FD is open on to MODE.  */
 285 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 286 extern int fchmod (int __fd, __mode_t __mode) __THROW;
 287 #endif
 288
 289
 290 /* Set the file creation mask of the current process to MASK,
 291    and return the old creation mask.  */
 292 extern __mode_t umask (__mode_t __mask) __THROW;
 293
 294 #ifdef  __USE_GNU
 295 /* Get the current `umask' value without changing it.
 296    This function is only available under the GNU Hurd.  */
 297 extern __mode_t getumask (void) __THROW;
 298 #endif
 299
 300 /* Create a new directory named PATH, with permission bits MODE.  */
 301 extern int mkdir (__const char *__path, __mode_t __mode)
 302      __THROW __nonnull ((1));
 303
 304 /* Create a device file named PATH, with permission and special bits MODE
 305    and device number DEV (which can be constructed from major and minor
 306    device numbers with the `makedev' macro above).  */
 307 #if defined __USE_MISC || defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 308 extern int mknod (__const char *__path, __mode_t __mode, __dev_t __dev)
 309      __THROW __nonnull ((1));
 310 #endif
 311
 312
 313 /* Create a new FIFO named PATH, with permission bits MODE.  */
 314 extern int mkfifo (__const char *__path, __mode_t __mode)
 315      __THROW __nonnull ((1));
 316 \f
 317 /* To allow the `struct stat' structure and the file type `mode_t'
 318    bits to vary without changing shared library major version number,
 319    the `stat' family of functions and `mknod' are in fact inline
 320    wrappers around calls to `xstat', `fxstat', `lxstat', and `xmknod',
 321    which all take a leading version-number argument designating the
 322    data structure and bits used.  <bits/stat.h> defines _STAT_VER with
 323    the version number corresponding to `struct stat' as defined in
 324    that file; and _MKNOD_VER with the version number corresponding to
 325    the S_IF* macros defined therein.  It is arranged that when not
 326    inlined these function are always statically linked; that way a
 327    dynamically-linked executable always encodes the version number
 328    corresponding to the data structures it uses, so the `x' functions
 329    in the shared library can adapt without needing to recompile all
 330    callers.  */
 331
 332 #ifndef _STAT_VER
 333 # define _STAT_VER      0
 334 #endif
 335 #ifndef _MKNOD_VER
 336 # define _MKNOD_VER     0
 337 #endif
 338
 339 /* Wrappers for stat and mknod system calls.  */
 340 #ifndef __USE_FILE_OFFSET64
 341 extern int __fxstat (int __ver, int __fildes, struct stat *__stat_buf)
 342      __THROW __nonnull ((3));
 343 extern int __xstat (int __ver, __const char *__filename,
 344                     struct stat *__stat_buf) __THROW __nonnull ((2, 3));
 345 extern int __lxstat (int __ver, __const char *__filename,
 346                      struct stat *__stat_buf) __THROW __nonnull ((2, 3));
 347 extern int __fxstatat (int __ver, int __fildes, __const char *__filename,
 348                        struct stat *__stat_buf, int __flag)
 349      __THROW __nonnull ((3, 4));
 350 #else
 351 # ifdef __REDIRECT_NTH
 352 extern int __REDIRECT_NTH (__fxstat, (int __ver, int __fildes,
 353                                       struct stat *__stat_buf), __fxstat64)
 354      __nonnull ((3));
 355 extern int __REDIRECT_NTH (__xstat, (int __ver, __const char *__filename,
 356                                      struct stat *__stat_buf), __xstat64)
 357      __nonnull ((2, 3));
 358 extern int __REDIRECT_NTH (__lxstat, (int __ver, __const char *__filename,
 359                                       struct stat *__stat_buf), __lxstat64)
 360      __nonnull ((2, 3));
 361 extern int __REDIRECT_NTH (__fxstatat, (int __ver, int __fildes,
 362                                         __const char *__filename,
 363                                         struct stat *__stat_buf, int __flag),
 364                            __fxstatat64) __nonnull ((3, 4));
 365
 366 # else
 367 #  define __fxstat __fxstat64
 368 #  define __xstat __xstat64
 369 #  define __lxstat __lxstat64
 370 # endif
 371 #endif
 372
 373 #ifdef __USE_LARGEFILE64
 374 extern int __fxstat64 (int __ver, int __fildes, struct stat64 *__stat_buf)
 375      __THROW __nonnull ((3));
 376 extern int __xstat64 (int __ver, __const char *__filename,
 377                       struct stat64 *__stat_buf) __THROW __nonnull ((2, 3));
 378 extern int __lxstat64 (int __ver, __const char *__filename,
 379                        struct stat64 *__stat_buf) __THROW __nonnull ((2, 3));
 380 extern int __fxstatat64 (int __ver, int __fildes, __const char *__filename,
 381                          struct stat64 *__stat_buf, int __flag)
 382      __THROW __nonnull ((3, 4));
 383 #endif
 384 extern int __xmknod (int __ver, __const char *__path, __mode_t __mode,
 385                      __dev_t *__dev) __THROW __nonnull ((2, 4));
 386
 387 #if defined __GNUC__ && __GNUC__ >= 2
 388 /* Inlined versions of the real stat and mknod functions.  */
 389
 390 extern __inline__ int
 391 __NTH (stat (__const char *__path, struct stat *__statbuf))
 392 {
 393   return __xstat (_STAT_VER, __path, __statbuf);
 394 }
 395
 396 # if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 397 extern __inline__ int
 398 __NTH (lstat (__const char *__path, struct stat *__statbuf))
 399 {
 400   return __lxstat (_STAT_VER, __path, __statbuf);
 401 }
 402 # endif
 403
 404 extern __inline__ int
 405 __NTH (fstat (int __fd, struct stat *__statbuf))
 406 {
 407   return __fxstat (_STAT_VER, __fd, __statbuf);
 408 }
 409
 410 # ifdef __USE_GNU
 411 extern __inline__ int
 412 __NTH (fstatat (int __fd, __const char *__filename, struct stat *__statbuf,
 413                 int __flag))
 414 {
 415   return __fxstatat (_STAT_VER, __fd, __filename, __statbuf, __flag);
 416 }
 417 # endif
 418
 419 # if defined __USE_MISC || defined __USE_BSD
 420 extern __inline__ int
 421 __NTH (mknod (__const char *__path, __mode_t __mode, __dev_t __dev))
 422 {
 423   return __xmknod (_MKNOD_VER, __path, __mode, &__dev);
 424 }
 425 # endif
 426
 427 # if defined __USE_LARGEFILE64 \
 428   && (! defined __USE_FILE_OFFSET64 \
 429       || (defined __REDIRECT_NTH && defined __OPTIMIZE__))
 430 extern __inline__ int
 431 __NTH (stat64 (__const char *__path, struct stat64 *__statbuf))
 432 {
 433   return __xstat64 (_STAT_VER, __path, __statbuf);
 434 }
 435
 436 #  if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 437 extern __inline__ int
 438 __NTH (lstat64 (__const char *__path, struct stat64 *__statbuf))
 439 {
 440   return __lxstat64 (_STAT_VER, __path, __statbuf);
 441 }
 442 #  endif
 443
 444 extern __inline__ int
 445 __NTH (fstat64 (int __fd, struct stat64 *__statbuf))
 446 {
 447   return __fxstat64 (_STAT_VER, __fd, __statbuf);
 448 }
 449 # endif
 450
 451 # ifdef __USE_GNU
 452 extern __inline__ int
 453 __NTH (fstatat64 (int __fd, __const char *__filename, struct stat64 *__statbuf,
 454                   int __flag))
 455 {
 456   return __fxstatat64 (_STAT_VER, __fd, __filename, __statbuf, __flag);
 457 }
 458 # endif
 459
 460 #endif
 461
 462 __END_DECLS
 463
 464
 465 #endif /* sys/stat.h  */