bits/fcntl.h

   1 /* O_*, F_*, FD_* bit values for stub configuration.
   2    Copyright (C) 1991, 1992, 1997, 2000, 2004 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 /* These values should be changed as appropriate for your system.  */
  20
  21 #ifndef _FCNTL_H
  22 # error "Never use <bits/fcntl.h> directly; include <fcntl.h> instead."
  23 #endif
  24
  25
  26 /* File access modes for `open' and `fcntl'.  */
  27 #define O_RDONLY        0       /* Open read-only.  */
  28 #define O_WRONLY        1       /* Open write-only.  */
  29 #define O_RDWR          2       /* Open read/write.  */
  30
  31
  32 /* Bits OR'd into the second argument to open.  */
  33 #define O_CREAT         0x0200  /* Create file if it doesn't exist.  */
  34 #define O_EXCL          0x0800  /* Fail if file already exists.  */
  35 #define O_TRUNC         0x0400  /* Truncate file to zero length.  */
  36 #define O_NOCTTY        0x0100  /* Don't assign a controlling terminal.  */
  37
  38 /* File status flags for `open' and `fcntl'.  */
  39 #define O_APPEND        0x0008  /* Writes append to the file.  */
  40 #define O_NONBLOCK      0x0004  /* Non-blocking I/O.  */
  41
  42 #ifdef __USE_BSD
  43 # define O_NDELAY       O_NONBLOCK
  44 #endif
  45
  46 /* Mask for file access modes.  This is system-dependent in case
  47    some system ever wants to define some other flavor of access.  */
  48 #define O_ACCMODE       (O_RDONLY|O_WRONLY|O_RDWR)
  49
  50 /* Values for the second argument to `fcntl'.  */
  51 #define F_DUPFD         0       /* Duplicate file descriptor.  */
  52 #define F_GETFD         1       /* Get file descriptor flags.  */
  53 #define F_SETFD         2       /* Set file descriptor flags.  */
  54 #define F_GETFL         3       /* Get file status flags.  */
  55 #define F_SETFL         4       /* Set file status flags.  */
  56 #if defined __USE_BSD || defined __USE_UNIX98
  57 # define F_GETOWN       5       /* Get owner (receiver of SIGIO).  */
  58 # define F_SETOWN       6       /* Set owner (receiver of SIGIO).  */
  59 #endif
  60 #define F_GETLK         7       /* Get record locking info.  */
  61 #define F_SETLK         8       /* Set record locking info.  */
  62 #define F_SETLKW        9       /* Set record locking info, wait.  */
  63
  64 /* File descriptor flags used with F_GETFD and F_SETFD.  */
  65 #define FD_CLOEXEC      1       /* Close on exec.  */
  66
  67
  68 #include <bits/types.h>
  69
  70 /* The structure describing an advisory lock.  This is the type of the third
  71    argument to `fcntl' for the F_GETLK, F_SETLK, and F_SETLKW requests.  */
  72 struct flock
  73   {
  74     short int l_type;   /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK.  */
  75     short int l_whence; /* Where `l_start' is relative to (like `lseek').  */
  76     __off_t l_start;    /* Offset where the lock begins.  */
  77     __off_t l_len;      /* Size of the locked area; zero means until EOF.  */
  78     __pid_t l_pid;      /* Process holding the lock.  */
  79   };
  80
  81 /* Values for the `l_type' field of a `struct flock'.  */
  82 #define F_RDLCK 1       /* Read lock.  */
  83 #define F_WRLCK 2       /* Write lock.  */
  84 #define F_UNLCK 3       /* Remove lock.  */
  85
  86 /* Advise to `posix_fadvise'.  */
  87 #ifdef __USE_XOPEN2K
  88 # define POSIX_FADV_NORMAL      0 /* No further special treatment.  */
  89 # define POSIX_FADV_RANDOM      1 /* Expect random page references.  */
  90 # define POSIX_FADV_SEQUENTIAL  2 /* Expect sequential page references.  */
  91 # define POSIX_FADV_WILLNEED    3 /* Will need these pages.  */
  92 # define POSIX_FADV_DONTNEED    4 /* Don't need these pages.  */
  93 # define POSIX_FADV_NOREUSE     5 /* Data will be accessed once.  */
  94 #endif