include/fcntl.h

   1 /* Copyright (C) 1991,1992,1994-2001,2003,2004,2005,2006,2007, 2009
   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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 /*
  21  *      POSIX Standard: 6.5 File Control Operations     <fcntl.h>
  22  */
  23
  24 #ifndef _FCNTL_H
  25 #define _FCNTL_H        1
  26
  27 #include <features.h>
  28
  29 /* This must be early so <bits/fcntl.h> can define types winningly.  */
  30 __BEGIN_DECLS
  31
  32 /* Get the definitions of O_*, F_*, FD_*: all the
  33    numbers and flag bits for `open', `fcntl', et al.  */
  34 #include <bits/fcntl.h>
  35
  36 /* For XPG all symbols from <sys/stat.h> should also be available.  */
  37 #ifdef __USE_XOPEN
  38 # include <sys/stat.h>
  39 #endif
  40
  41 #ifdef  __USE_MISC
  42 # ifndef R_OK                   /* Verbatim from <unistd.h>.  Ugh.  */
  43 /* Values for the second argument to access.
  44    These may be OR'd together.  */
  45 #  define R_OK  4               /* Test for read permission.  */
  46 #  define W_OK  2               /* Test for write permission.  */
  47 #  define X_OK  1               /* Test for execute permission.  */
  48 #  define F_OK  0               /* Test for existence.  */
  49 # endif
  50 #endif /* Use misc.  */
  51
  52 /* XPG wants the following symbols.  */
  53 #ifdef __USE_XOPEN              /* <stdio.h> has the same definitions.  */
  54 # define SEEK_SET       0       /* Seek from beginning of file.  */
  55 # define SEEK_CUR       1       /* Seek from current position.  */
  56 # define SEEK_END       2       /* Seek from end of file.  */
  57 #endif  /* XPG */
  58
  59 #ifdef __USE_ATFILE
  60 # define AT_FDCWD               -100    /* Special value used to indicate
  61                                            the *at functions should use the
  62                                            current working directory. */
  63 # define AT_SYMLINK_NOFOLLOW    0x100   /* Do not follow symbolic links.  */
  64 # define AT_REMOVEDIR           0x200   /* Remove directory instead of
  65                                            unlinking file.  */
  66 # define AT_SYMLINK_FOLLOW      0x400   /* Follow symbolic links.  */
  67 # define AT_EACCESS             0x200   /* Test access permitted for
  68                                            effective IDs, not real IDs.  */
  69 #endif
  70
  71 /* Do the file control operation described by CMD on FD.
  72    The remaining arguments are interpreted depending on CMD.
  73
  74    This function is a cancellation point and therefore not marked with
  75    __THROW.  */
  76 #if !defined(__USE_FILE_OFFSET64) || defined(__LP64__)
  77 extern int fcntl (int __fd, int __cmd, ...);
  78 libc_hidden_proto(fcntl)
  79 #else
  80 # ifdef __REDIRECT
  81 extern int __REDIRECT (fcntl, (int __fd, int __cmd, ...), fcntl64);
  82 # else
  83 #  define fcntl fcntl64
  84 # endif
  85 #endif
  86 #if defined(__USE_LARGEFILE64) && !defined(__LP64__)
  87 extern int fcntl64 (int __fd, int __cmd, ...);
  88 libc_hidden_proto(fcntl64)
  89 #endif
  90
  91 /* Open FILE and return a new file descriptor for it, or -1 on error.
  92    OFLAG determines the type of access used.  If O_CREAT is on OFLAG,
  93    the third argument is taken as a `mode_t', the mode of the created file.
  94
  95    This function is a cancellation point and therefore not marked with
  96    __THROW.  */
  97 #ifndef __USE_FILE_OFFSET64
  98 extern int open (__const char *__file, int __oflag, ...) __nonnull ((1));
  99 libc_hidden_proto(open)
 100 #else
 101 # ifdef __REDIRECT
 102 extern int __REDIRECT (open, (__const char *__file, int __oflag, ...), open64)
 103      __nonnull ((1));
 104 # else
 105 #  define open open64
 106 # endif
 107 #endif
 108 #ifdef __USE_LARGEFILE64
 109 extern int open64 (__const char *__file, int __oflag, ...) __nonnull ((1));
 110 libc_hidden_proto(open64)
 111 #endif
 112
 113 #ifdef __USE_ATFILE
 114 /* Similar to `open' but a relative path name is interpreted relative to
 115    the directory for which FD is a descriptor.
 116
 117    NOTE: some other `openat' implementation support additional functionality
 118    through this interface, especially using the O_XATTR flag.  This is not
 119    yet supported here.
 120
 121    This function is a cancellation point and therefore not marked with
 122    __THROW.  */
 123 # ifndef __USE_FILE_OFFSET64
 124 extern int openat (int __fd, __const char *__file, int __oflag, ...)
 125      __nonnull ((2));
 126 libc_hidden_proto(openat)
 127 # else
 128 #  ifdef __REDIRECT
 129 extern int __REDIRECT (openat, (int __fd, __const char *__file, int __oflag,
 130                                 ...), openat64) __nonnull ((2));
 131 #  else
 132 #   define openat openat64
 133 #  endif
 134 # endif
 135
 136 extern int openat64 (int __fd, __const char *__file, int __oflag, ...)
 137      __nonnull ((2));
 138 libc_hidden_proto(openat64)
 139 #endif
 140
 141 /* Create and open FILE, with mode MODE.  This takes an `int' MODE
 142    argument because that is what `mode_t' will be widened to.
 143
 144    This function is a cancellation point and therefore not marked with
 145    __THROW.  */
 146 #ifndef __USE_FILE_OFFSET64
 147 extern int creat (__const char *__file, __mode_t __mode) __nonnull ((1));
 148 #else
 149 # ifdef __REDIRECT
 150 extern int __REDIRECT (creat, (__const char *__file, __mode_t __mode),
 151                        creat64) __nonnull ((1));
 152 # else
 153 #  define creat creat64
 154 # endif
 155 #endif
 156 #ifdef __USE_LARGEFILE64
 157 extern int creat64 (__const char *__file, __mode_t __mode) __nonnull ((1));
 158 #endif
 159
 160 #if !defined F_LOCK && (defined __USE_MISC || (defined __USE_XOPEN_EXTENDED \
 161                                                && !defined __USE_POSIX))
 162 /* NOTE: These declarations also appear in <unistd.h>; be sure to keep both
 163    files consistent.  Some systems have them there and some here, and some
 164    software depends on the macros being defined without including both.  */
 165
 166 /* `lockf' is a simpler interface to the locking facilities of `fcntl'.
 167    LEN is always relative to the current file position.
 168    The CMD argument is one of the following.  */
 169
 170 # define F_ULOCK 0      /* Unlock a previously locked region.  */
 171 # define F_LOCK  1      /* Lock a region for exclusive use.  */
 172 # define F_TLOCK 2      /* Test and lock a region for exclusive use.  */
 173 # define F_TEST  3      /* Test a region for other processes locks.  */
 174
 175 # ifndef __USE_FILE_OFFSET64
 176 extern int lockf (int __fd, int __cmd, __off_t __len);
 177 libc_hidden_proto(lockf)
 178 # else
 179 #  ifdef __REDIRECT
 180 extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len), lockf64);
 181 #  else
 182 #   define lockf lockf64
 183 #  endif
 184 # endif
 185 # ifdef __USE_LARGEFILE64
 186 extern int lockf64 (int __fd, int __cmd, __off64_t __len);
 187 libc_hidden_proto(lockf64)
 188 # endif
 189 #endif
 190
 191 #if defined __USE_XOPEN2K && defined __UCLIBC_HAS_ADVANCED_REALTIME__
 192 /* Advice the system about the expected behaviour of the application with
 193    respect to the file associated with FD.  */
 194 # ifndef __USE_FILE_OFFSET64
 195 extern int posix_fadvise (int __fd, __off_t __offset, __off_t __len,
 196                           int __advise) __THROW;
 197 # else
 198 #  ifdef __REDIRECT_NTH
 199 extern int __REDIRECT_NTH (posix_fadvise, (int __fd, __off64_t __offset,
 200                                            __off64_t __len, int __advise),
 201                            posix_fadvise64);
 202 #  else
 203 #   define posix_fadvise posix_fadvise64
 204 #  endif
 205 # endif
 206 # ifdef __USE_LARGEFILE64
 207 extern int posix_fadvise64 (int __fd, __off64_t __offset, __off64_t __len,
 208                             int __advise) __THROW;
 209 # endif
 210
 211 #endif
 212
 213 #if 0 /* && defined __UCLIBC_HAS_ADVANCED_REALTIME__ */
 214
 215 /* FIXME -- uClibc should probably implement these... */
 216
 217 /* Reserve storage for the data of the file associated with FD.
 218
 219    This function is a possible cancellation points and therefore not
 220    marked with __THROW.  */
 221 # ifndef __USE_FILE_OFFSET64
 222 extern int posix_fallocate (int __fd, __off_t __offset, __off_t __len);
 223 # else
 224 #  ifdef __REDIRECT
 225 extern int __REDIRECT (posix_fallocate, (int __fd, __off64_t __offset,
 226                                          __off64_t __len),
 227                        posix_fallocate64);
 228 #  else
 229 #   define posix_fallocate posix_fallocate64
 230 #  endif
 231 # endif
 232 # ifdef __USE_LARGEFILE64
 233 extern int posix_fallocate64 (int __fd, __off64_t __offset, __off64_t __len);
 234 # endif
 235 #endif
 236
 237 #ifdef _LIBC
 238 extern int __fcntl_nocancel (int fd, int cmd, ...);
 239 libc_hidden_proto(__fcntl_nocancel)
 240 #endif
 241
 242 __END_DECLS
 243
 244 #endif /* fcntl.h  */