io/fcntl.h

   1 /* Copyright (C) 1991,92,94,95,96,97,98,99,2000,2001 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: 6.5 File Control Operations     <fcntl.h>
  21  */
  22
  23 #ifndef _FCNTL_H
  24 #define _FCNTL_H        1
  25
  26 #include <features.h>
  27
  28 /* This must be early so <bits/fcntl.h> can define types winningly.  */
  29 __BEGIN_DECLS
  30
  31 /* Get the definitions of O_*, F_*, FD_*: all the
  32    numbers and flag bits for `open', `fcntl', et al.  */
  33 #include <bits/fcntl.h>
  34
  35 /* For XPG all symbols from <sys/stat.h> should also be available.  */
  36 #ifdef __USE_XOPEN
  37 # include <sys/stat.h>
  38 #endif
  39
  40 #ifdef  __USE_MISC
  41 # ifndef R_OK                   /* Verbatim from <unistd.h>.  Ugh.  */
  42 /* Values for the second argument to access.
  43    These may be OR'd together.  */
  44 #  define R_OK  4               /* Test for read permission.  */
  45 #  define W_OK  2               /* Test for write permission.  */
  46 #  define X_OK  1               /* Test for execute permission.  */
  47 #  define F_OK  0               /* Test for existence.  */
  48 # endif
  49 #endif /* Use misc.  */
  50
  51 /* XPG wants the following symbols.  */
  52 #ifdef __USE_XOPEN              /* <stdio.h> has the same definitions.  */
  53 # define SEEK_SET       0       /* Seek from beginning of file.  */
  54 # define SEEK_CUR       1       /* Seek from current position.  */
  55 # define SEEK_END       2       /* Seek from end of file.  */
  56 #endif  /* XPG */
  57
  58 /* Do the file control operation described by CMD on FD.
  59    The remaining arguments are interpreted depending on CMD.  */
  60 extern int fcntl (int __fd, int __cmd, ...) __THROW;
  61
  62 /* Open FILE and return a new file descriptor for it, or -1 on error.
  63    OFLAG determines the type of access used.  If O_CREAT is on OFLAG,
  64    the third argument is taken as a `mode_t', the mode of the created file.  */
  65 #ifndef __USE_FILE_OFFSET64
  66 extern int open (__const char *__file, int __oflag, ...) __THROW;
  67 #else
  68 # ifdef __REDIRECT
  69 extern int __REDIRECT (open, (__const char *__file, int __oflag, ...) __THROW,
  70                        open64);
  71 # else
  72 #  define open open64
  73 # endif
  74 #endif
  75 #ifdef __USE_LARGEFILE64
  76 extern int open64 (__const char *__file, int __oflag, ...) __THROW;
  77 #endif
  78
  79 /* Create and open FILE, with mode MODE.
  80    This takes an `int' MODE argument because that is
  81    what `mode_t' will be widened to.  */
  82 #ifndef __USE_FILE_OFFSET64
  83 extern int creat (__const char *__file, __mode_t __mode) __THROW;
  84 #else
  85 # ifdef __REDIRECT
  86 extern int __REDIRECT (creat, (__const char *__file, __mode_t __mode) __THROW,
  87                        creat64);
  88 # else
  89 #  define creat creat64
  90 # endif
  91 #endif
  92 #ifdef __USE_LARGEFILE64
  93 extern int creat64 (__const char *__file, __mode_t __mode) __THROW;
  94 #endif
  95
  96 #if !defined F_LOCK && (defined __USE_MISC || (defined __USE_XOPEN_EXTENDED \
  97                                                && !defined __USE_POSIX))
  98 /* NOTE: These declarations also appear in <unistd.h>; be sure to keep both
  99    files consistent.  Some systems have them there and some here, and some
 100    software depends on the macros being defined without including both.  */
 101
 102 /* `lockf' is a simpler interface to the locking facilities of `fcntl'.
 103    LEN is always relative to the current file position.
 104    The CMD argument is one of the following.  */
 105
 106 # define F_ULOCK 0      /* Unlock a previously locked region.  */
 107 # define F_LOCK  1      /* Lock a region for exclusive use.  */
 108 # define F_TLOCK 2      /* Test and lock a region for exclusive use.  */
 109 # define F_TEST  3      /* Test a region for other processes locks.  */
 110
 111 # ifndef __USE_FILE_OFFSET64
 112 extern int lockf (int __fd, int __cmd, __off_t __len) __THROW;
 113 # else
 114 # ifdef __REDIRECT
 115 extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len) __THROW,
 116                        lockf64);
 117 # else
 118 #  define lockf lockf64
 119 # endif
 120 # endif
 121 # ifdef __USE_LARGEFILE64
 122 extern int lockf64 (int __fd, int __cmd, __off64_t __len) __THROW;
 123 # endif
 124 #endif
 125
 126 #ifdef __USE_XOPEN2K
 127 /* Advice the system about the expected behaviour of the application with
 128    respect to the file associated with FD.  */
 129 # ifndef __USE_FILE_OFFSET64
 130 extern int posix_fadvise (int __fd, __off_t __offset, size_t __len,
 131                           int __advise) __THROW;
 132 # else
 133 # ifdef __REDIRECT
 134 extern int __REDIRECT (posix_fadvise, (int __fd, __off64_t __offset,
 135                                        size_t __len, int __advise) __THROW,
 136                        posix_fadvise64);
 137 # else
 138 #  define posix_fadvise posix_fadvise64
 139 # endif
 140 # endif
 141 # ifdef __USE_LARGEFILE64
 142 extern int posix_fadvise64 (int __fd, __off64_t __offset, size_t __len,
 143                             int __advise) __THROW;
 144 # endif
 145
 146
 147 /* Reserve storage for the data of the file associated with FD.  */
 148 # ifndef __USE_FILE_OFFSET64
 149 extern int posix_fallocate (int __fd, __off_t __offset, size_t __len) __THROW;
 150 # else
 151 # ifdef __REDIRECT
 152 extern int __REDIRECT (posix_fallocate, (int __fd, __off64_t __offset,
 153                                          size_t __len) __THROW,
 154                        posix_fallocate64);
 155 # else
 156 #  define posix_fallocate posix_fallocate64
 157 # endif
 158 # endif
 159 # ifdef __USE_LARGEFILE64
 160 extern int posix_fallocate64 (int __fd, __off64_t __offset, size_t __len)
 161      __THROW;
 162 # endif
 163 #endif
 164
 165 __END_DECLS
 166
 167 #endif /* fcntl.h  */