io/fcntl.h

   1 /* Copyright (C) 1991, 92, 94, 95, 96, 97 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 #ifdef  __USE_MISC
  36 # ifndef R_OK                   /* Verbatim from <unistd.h>.  Ugh.  */
  37 /* Values for the second argument to access.
  38    These may be OR'd together.  */
  39 #  define R_OK  4               /* Test for read permission.  */
  40 #  define W_OK  2               /* Test for write permission.  */
  41 #  define X_OK  1               /* Test for execute permission.  */
  42 #  define F_OK  0               /* Test for existence.  */
  43 # endif
  44 #endif /* Use misc.  */
  45
  46 /* Do the file control operation described by CMD on FD.
  47    The remaining arguments are interpreted depending on CMD.  */
  48 extern int __fcntl __P ((int __fd, int __cmd, ...));
  49 extern int fcntl __P ((int __fd, int __cmd, ...));
  50
  51 /* Open FILE and return a new file descriptor for it, or -1 on error.
  52    OFLAG determines the type of access used.  If O_CREAT is on OFLAG,
  53    the third argument is taken as a `mode_t', the mode of the created file.  */
  54 extern int __open __P ((__const char *__file, int __oflag, ...));
  55 extern int __open64 __P ((__const char *__file, int __oflag, ...));
  56 #ifndef __USE_FILE_OFFSET64
  57 extern int open __P ((__const char *__file, int __oflag, ...));
  58 #else
  59 extern int open __P ((__const char *__file, int __oflag, ...))
  60      __asm__ ("open64");
  61 #endif
  62 #ifdef __USE_LARGEFILE64
  63 extern int open64 __P ((__const char *__file, int __oflag, ...));
  64 #endif
  65
  66 /* Create and open FILE, with mode MODE.
  67    This takes an `int' MODE argument because that is
  68    what `mode_t' will be widened to.  */
  69 #ifndef __USE_FILE_OFFSET64
  70 extern int creat __P ((__const char *__file, __mode_t __mode));
  71 #else
  72 extern int creat __P ((__const char *__file, __mode_t __mode))
  73      __asm__ ("creat64");
  74 #endif
  75 #ifdef __USE_LARGEFILE64
  76 extern int creat64 __P ((__const char *__file, __mode_t __mode));
  77 #endif
  78
  79 #if !defined F_LOCK && (defined __USE_MISC || defined __USE_XOPEN_EXTENDED)
  80 /* NOTE: These declarations also appear in <unistd.h>; be sure to keep both
  81    files consistent.  Some systems have them there and some here, and some
  82    software depends on the macros being defined without including both.  */
  83
  84 /* `lockf' is a simpler interface to the locking facilities of `fcntl'.
  85    LEN is always relative to the current file position.
  86    The CMD argument is one of the following.  */
  87
  88 # define F_ULOCK 0      /* Unlock a previously locked region.  */
  89 # define F_LOCK  1      /* Lock a region for exclusive use.  */
  90 # define F_TLOCK 2      /* Test and lock a region for exclusive use.  */
  91 # define F_TEST  3      /* Test a region for other processes locks.  */
  92
  93 # ifndef __USE_FILE_OFFSET64
  94 extern int lockf __P ((int __fd, int __cmd, __off_t __len));
  95 # else
  96 extern int lockf __P ((int __fd, int __cmd, __off_t __len))
  97      __asm__ ("lockf64");
  98 # endif
  99 # ifdef __USE_LARGEFILE64
 100 extern int lockf64 __P ((int __fd, int __cmd, __off64_t __len));
 101 # endif
 102 #endif
 103
 104 __END_DECLS
 105
 106 #endif /* fcntl.h  */