io/fcntl.h

   1 /* Copyright (C) 1991, 92, 94, 95, 96, 97, 98 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 not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 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 __P ((int __fd, int __cmd, ...));
  61 extern int fcntl __P ((int __fd, int __cmd, ...));
  62
  63 /* Open FILE and return a new file descriptor for it, or -1 on error.
  64    OFLAG determines the type of access used.  If O_CREAT is on OFLAG,
  65    the third argument is taken as a `mode_t', the mode of the created file.  */
  66 extern int __open __P ((__const char *__file, int __oflag, ...));
  67 #ifndef __USE_FILE_OFFSET64
  68 extern int open __P ((__const char *__file, int __oflag, ...));
  69 #else
  70 # ifdef __REDIRECT
  71 extern int __REDIRECT (open, __P ((__const char *__file, int __oflag, ...)),
  72                        open64);
  73 # else
  74 #  define open open64
  75 # endif
  76 #endif
  77 #ifdef __USE_LARGEFILE64
  78 extern int open64 __P ((__const char *__file, int __oflag, ...));
  79 #endif
  80
  81 /* Create and open FILE, with mode MODE.
  82    This takes an `int' MODE argument because that is
  83    what `mode_t' will be widened to.  */
  84 #ifndef __USE_FILE_OFFSET64
  85 extern int creat __P ((__const char *__file, __mode_t __mode));
  86 #else
  87 # ifdef __REDIRECT
  88 extern int __REDIRECT (creat, __P ((__const char *__file, __mode_t __mode)),
  89                        creat64);
  90 # else
  91 #  define creat creat64
  92 # endif
  93 #endif
  94 #ifdef __USE_LARGEFILE64
  95 extern int creat64 __P ((__const char *__file, __mode_t __mode));
  96 #endif
  97
  98 #if !defined F_LOCK && (defined __USE_MISC || (defined __USE_XOPEN_EXTENDED \
  99                                                && !defined __USE_POSIX))
 100 /* NOTE: These declarations also appear in <unistd.h>; be sure to keep both
 101    files consistent.  Some systems have them there and some here, and some
 102    software depends on the macros being defined without including both.  */
 103
 104 /* `lockf' is a simpler interface to the locking facilities of `fcntl'.
 105    LEN is always relative to the current file position.
 106    The CMD argument is one of the following.  */
 107
 108 # define F_ULOCK 0      /* Unlock a previously locked region.  */
 109 # define F_LOCK  1      /* Lock a region for exclusive use.  */
 110 # define F_TLOCK 2      /* Test and lock a region for exclusive use.  */
 111 # define F_TEST  3      /* Test a region for other processes locks.  */
 112
 113 # ifndef __USE_FILE_OFFSET64
 114 extern int lockf __P ((int __fd, int __cmd, __off_t __len));
 115 # else
 116 # ifdef __REDIRECT
 117 extern int __REDIRECT (lockf, __P ((int __fd, int __cmd, __off64_t __len)),
 118                        lockf64);
 119 # else
 120 #  define lockf lockf64
 121 # endif
 122 # endif
 123 # ifdef __USE_LARGEFILE64
 124 extern int lockf64 __P ((int __fd, int __cmd, __off64_t __len));
 125 # endif
 126 #endif
 127
 128 __END_DECLS
 129
 130 #endif /* fcntl.h  */