io/sys/stat.h

   1 /* Copyright (C) 1991, 1992, 1995, 1996 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 /*
  20  *      POSIX Standard: 5.6 File Characteristics        <sys/stat.h>
  21  */
  22
  23 #ifndef _SYS_STAT_H
  24
  25 #define _SYS_STAT_H     1
  26 #include <features.h>
  27
  28 #include <gnu/types.h>          /* For __mode_t and __dev_t.  */
  29
  30 __BEGIN_DECLS
  31
  32 #include <statbuf.h>
  33
  34 #if defined(__USE_BSD) || defined(__USE_MISC)
  35 #define S_IFMT          __S_IFMT
  36 #define S_IFDIR         __S_IFDIR
  37 #define S_IFCHR         __S_IFCHR
  38 #define S_IFBLK         __S_IFBLK
  39 #define S_IFREG         __S_IFREG
  40 #ifdef __S_IFLNK
  41 #define S_IFLNK         __S_IFLNK
  42 #endif
  43 #ifdef __S_IFSOCK
  44 #define S_IFSOCK        __S_IFSOCK
  45 #endif
  46 #ifdef __S_IFIFO
  47 #define S_IFIFO         __S_IFIFO
  48 #endif
  49 #endif
  50
  51 /* Test macros for file types.  */
  52
  53 #define __S_ISTYPE(mode, mask)  (((mode) & __S_IFMT) == (mask))
  54
  55 #define S_ISDIR(mode)   __S_ISTYPE((mode), __S_IFDIR)
  56 #define S_ISCHR(mode)   __S_ISTYPE((mode), __S_IFCHR)
  57 #define S_ISBLK(mode)   __S_ISTYPE((mode), __S_IFBLK)
  58 #define S_ISREG(mode)   __S_ISTYPE((mode), __S_IFREG)
  59 #ifdef __S_IFIFO
  60 #define S_ISFIFO(mode)  __S_ISTYPE((mode), __S_IFIFO)
  61 #endif
  62
  63 #ifdef  __USE_GNU
  64 #ifdef __S_IFLNK
  65 #define S_ISLNK(mode)   __S_ISTYPE((mode), __S_IFLNK)
  66 #endif
  67 #ifdef __S_IFSOCK
  68 #define S_ISSOCK(mode)  __S_ISTYPE((mode), __S_IFSOCK)
  69 #endif
  70 #endif
  71
  72
  73 /* Protection bits.  */
  74
  75 #define S_ISUID __S_ISUID       /* Set user ID on execution.  */
  76 #define S_ISGID __S_ISGID       /* Set group ID on execution.  */
  77
  78 #if defined(__USE_BSD) || defined(__USE_MISC)
  79 /* Save swapped text after use (sticky bit).  This is pretty well obsolete.  */
  80 #define S_ISVTX __S_ISVTX
  81 #endif
  82
  83 #define S_IRUSR __S_IREAD       /* Read by owner.  */
  84 #define S_IWUSR __S_IWRITE      /* Write by owner.  */
  85 #define S_IXUSR __S_IEXEC       /* Execute by owner.  */
  86 /* Read, write, and execute by owner.  */
  87 #define S_IRWXU (__S_IREAD|__S_IWRITE|__S_IEXEC)
  88
  89 #if     defined(__USE_MISC) && defined(__USE_BSD)
  90 #define S_IREAD         S_IRUSR
  91 #define S_IWRITE        S_IWUSR
  92 #define S_IEXEC         S_IXUSR
  93 #endif
  94
  95 #define S_IRGRP (S_IRUSR >> 3)  /* Read by group.  */
  96 #define S_IWGRP (S_IWUSR >> 3)  /* Write by group.  */
  97 #define S_IXGRP (S_IXUSR >> 3)  /* Execute by group.  */
  98 /* Read, write, and execute by group.  */
  99 #define S_IRWXG (S_IRWXU >> 3)
 100
 101 #define S_IROTH (S_IRGRP >> 3)  /* Read by others.  */
 102 #define S_IWOTH (S_IWGRP >> 3)  /* Write by others.  */
 103 #define S_IXOTH (S_IXGRP >> 3)  /* Execute by others.  */
 104 /* Read, write, and execute by others.  */
 105 #define S_IRWXO (S_IRWXG >> 3)
 106
 107
 108 #ifdef  __USE_BSD
 109 /* Macros for common mode bit masks.  */
 110 #define ACCESSPERMS (S_IRWXU|S_IRWXG|S_IRWXO) /* 0777 */
 111 #define ALLPERMS (S_ISUID|S_ISGID|S_ISTXT|S_IRWXU|S_IRWXG|S_IRWXO)/* 07777 */
 112 #define DEFFILEMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)/* 0666 */
 113
 114 #define S_BLKSIZE       512     /* Block size for `st_blocks'.  */
 115 #endif
 116
 117
 118 /* Get file attributes for FILE and put them in BUF.  */
 119 extern int __stat __P ((__const char *__file, struct stat *__buf));
 120 extern int stat __P ((__const char *__file, struct stat *__buf));
 121
 122 /* Get file attributes for the file, device, pipe, or socket
 123    that file descriptor FD is open on and put them in BUF.  */
 124 extern int __fstat __P ((int __fd, struct stat *__buf));
 125 extern int fstat __P ((int __fd, struct stat *__buf));
 126
 127 /* Get file attributes about FILE and put them in BUF.
 128    If FILE is a symbolic link, do not follow it.  */
 129 extern int __lstat __P ((__const char *__file, struct stat *__buf));
 130 #ifdef  __USE_BSD
 131 extern int lstat __P ((__const char *__file, struct stat *__buf));
 132 #endif
 133
 134 /* Set file access permissions for FILE to MODE.
 135    This takes an `int' MODE argument because that
 136    is what `mode_t's get widened to.  */
 137 extern int __chmod __P ((__const char *__file, __mode_t __mode));
 138 extern int chmod __P ((__const char *__file, __mode_t __mode));
 139
 140 /* Set file access permissions of the file FD is open on to MODE.  */
 141 extern int __fchmod __P ((int __fd, __mode_t __mode));
 142 #ifdef  __USE_BSD
 143 extern int fchmod __P ((int __fd, __mode_t __mode));
 144 #endif
 145
 146
 147 /* Set the file creation mask of the current process to MASK,
 148    and return the old creation mask.  */
 149 extern __mode_t __umask __P ((__mode_t __mask));
 150 extern __mode_t umask __P ((__mode_t __mask));
 151
 152 #ifdef  __USE_GNU
 153 /* Get the current `umask' value without changing it.
 154    This function is only available under the GNU Hurd.  */
 155 extern __mode_t getumask __P ((void));
 156 #endif
 157
 158 /* Create a new directory named PATH, with permission bits MODE.  */
 159 extern int __mkdir __P ((__const char *__path, __mode_t __mode));
 160 extern int mkdir __P ((__const char *__path, __mode_t __mode));
 161
 162 /* Create a device file named PATH, with permission and special bits MODE
 163    and device number DEV (which can be constructed from major and minor
 164    device numbers with the `makedev' macro above).  */
 165 extern int __mknod __P ((__const char *__path,
 166                          __mode_t __mode, __dev_t __dev));
 167 #if     defined(__USE_MISC) || defined(__USE_BSD)
 168 extern int mknod __P ((__const char *__path,
 169                        __mode_t __mode, __dev_t __dev));
 170 #endif
 171
 172
 173 /* Create a new FIFO named PATH, with permission bits MODE.  */
 174 extern int mkfifo __P ((__const char *__path, __mode_t __mode));
 175 \f
 176 /* To allow the `struct stat' structure and the file type `mode_t' bits to
 177    vary without changing shared library major version number, the `stat'
 178    family of functions and `mknod' are in fact inline wrappers around calls
 179    to `xstat', `fxstat', `lxstat', and `xmknod', which all take a leading
 180    version-number argument designating the data structure and bits used.
 181    <statbuf.h> defines _STAT_VER with the version number corresponding to
 182    `struct stat' as defined in that file; and _MKNOD_VER with the version
 183    number corresponding to the S_IF* macros defined therein.  It is
 184    arranged that when not inlined these function are always statically
 185    linked; that way a dynamically-linked executable always encodes the
 186    version number corresponding to the data structures it uses, so the `x'
 187    functions in the shared library can adapt without needing to recompile
 188    all callers.  */
 189
 190 #ifndef _STAT_VER
 191 #define _STAT_VER       0
 192 #endif
 193 #ifndef _MKNOD_VER
 194 #define _MKNOD_VER      0
 195 #endif
 196
 197 /* Wrappers for stat and mknod system calls.  */
 198 extern int __fxstat __P ((int __ver, int __fildes,
 199                           struct stat *__stat_buf));
 200 extern int __xstat __P ((int __ver, __const char *__filename,
 201                          struct stat *__stat_buf));
 202 extern int __lxstat __P ((int __ver, __const char *__filename,
 203                           struct stat *__stat_buf));
 204 extern int __xmknod __P ((int __ver, __const char *__path,
 205                           __mode_t __mode, __dev_t *__dev));
 206
 207 #if defined (__GNUC__) && __GNUC__ >= 2
 208 /* Inlined versions of the real stat and mknod functions.  */
 209
 210 extern __inline__ int __stat (__const char *__path, struct stat *__statbuf)
 211 { return __xstat (_STAT_VER, __path, __statbuf); }
 212 extern __inline__ int stat (__const char *__path, struct stat *__statbuf)
 213 { return __xstat (_STAT_VER, __path, __statbuf); }
 214
 215 extern __inline__ int __lstat(__const char *__path, struct stat *__statbuf)
 216 { return __lxstat (_STAT_VER, __path, __statbuf); }
 217 extern __inline__ int lstat(__const char *__path, struct stat *__statbuf)
 218 { return __lxstat (_STAT_VER, __path, __statbuf); }
 219
 220 extern __inline__ int __fstat (int __fd, struct stat *__statbuf)
 221 { return __fxstat (_STAT_VER, __fd, __statbuf); }
 222 extern __inline__ int fstat (int __fd, struct stat *__statbuf)
 223 { return __fxstat (_STAT_VER, __fd, __statbuf); }
 224
 225 extern __inline__ int __mknod (__const char *__path, __mode_t __mode,
 226                                __dev_t __dev)
 227 { return __xmknod (_MKNOD_VER, __path, __mode, &__dev); }
 228 #if     defined(__USE_MISC) || defined(__USE_BSD)
 229 extern __inline__ int mknod (__const char *__path, __mode_t __mode,
 230                              __dev_t __dev)
 231 { return __xmknod (_MKNOD_VER, __path, __mode, &__dev); }
 232 #endif
 233
 234 #endif
 235
 236 __END_DECLS
 237
 238
 239 #endif /* sys/stat.h  */