sysdeps/mach/hurd/bits/fcntl.h

   1 /* O_*, F_*, FD_* bit values for GNU.
   2    Copyright (C) 1993,1994,1996,1997,1998,1999,2000,2001,2004,2007
   3         Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef _FCNTL_H
  21 # error "Never use <bits/fcntl.h> directly; include <fcntl.h> instead."
  22 #endif
  23
  24 #include <sys/types.h>
  25
  26 /* File access modes.  These are understood by io servers; they can be
  27    passed in `dir_lookup', and are returned by `io_get_openmodes'.
  28    Consequently they can be passed to `open', `hurd_file_name_lookup', and
  29    `file_name_lookup'; and are returned by `fcntl' with the F_GETFL
  30    command.  */
  31
  32 /* In GNU, read and write are bits (unlike BSD).  */
  33 #ifdef __USE_GNU
  34 # define O_READ         O_RDONLY /* Open for reading.  */
  35 # define O_WRITE        O_WRONLY /* Open for writing.  */
  36 # define O_EXEC         0x0004  /* Open for execution.  */
  37 # define O_NORW         0       /* Open without R/W access.  */
  38 #endif
  39 /* POSIX.1 standard names.  */
  40 #define O_RDONLY        0x0001  /* Open read-only.  */
  41 #define O_WRONLY        0x0002  /* Open write-only.  */
  42 #define O_RDWR          (O_RDONLY|O_WRONLY) /* Open for reading and writing. */
  43 #define O_ACCMODE       O_RDWR  /* Mask for file access modes.  */
  44
  45 #define O_LARGEFILE     0
  46
  47
  48 /* File name translation flags.  These are understood by io servers;
  49    they can be passed in `dir_lookup', and consequently to `open',
  50    `hurd_file_name_lookup', and `file_name_lookup'.  */
  51
  52 #define O_CREAT         0x0010  /* Create file if it doesn't exist.  */
  53 #define O_EXCL          0x0020  /* Fail if file already exists.  */
  54 #ifdef __USE_GNU
  55 # define O_NOLINK       0x0040  /* No name mappings on final component.  */
  56 # define O_NOTRANS      0x0080  /* No translator on final component. */
  57
  58 # define O_NOFOLLOW     0x00100000 /* Produce ENOENT if file is a symlink.  */
  59 # define O_DIRECTORY    0x00200000 /* Produce ENOTDIR if not a directory.  */
  60 #endif
  61
  62
  63 /* I/O operating modes.  These are understood by io servers; they can be
  64    passed in `dir_lookup' and set or fetched with `io_*_openmodes'.
  65    Consequently they can be passed to `open', `hurd_file_name_lookup',
  66    `file_name_lookup', and `fcntl' with the F_SETFL command; and are
  67    returned by `fcntl' with the F_GETFL command.  */
  68
  69 #define O_APPEND        0x0100  /* Writes always append to the file.  */
  70 #define O_ASYNC         0x0200  /* Send SIGIO to owner when data is ready.  */
  71 #define O_FSYNC         0x0400  /* Synchronous writes.  */
  72 #define O_SYNC          O_FSYNC
  73 #ifdef __USE_GNU
  74 # define O_NOATIME      0x0800  /* Don't set access time on read (owner).  */
  75 #endif
  76 #ifdef  __USE_MISC
  77 # define O_SHLOCK       0x00020000 /* Open with shared file lock.  */
  78 # define O_EXLOCK       0x00040000 /* Open with exclusive file lock.  */
  79 #endif
  80
  81 /* These are lesser flavors of partial synchronization that are
  82    implied by our one flag (O_FSYNC).  */
  83 #if defined __USE_POSIX199309 || defined __USE_UNIX98
  84 # define O_DSYNC        O_SYNC  /* Synchronize data.  */
  85 # define O_RSYNC        O_SYNC  /* Synchronize read operations.  */
  86 #endif
  87
  88
  89 /* The name O_NONBLOCK is unfortunately overloaded; it is both a file name
  90    translation flag and an I/O operating mode.  O_NDELAY is the deprecated
  91    BSD name for the same flag, overloaded in the same way.
  92
  93    When used in `dir_lookup' (and consequently `open', `hurd_file_name_lookup',
  94    or `file_name_lookup'), O_NONBLOCK says the open should return immediately
  95    instead of blocking for any significant length of time (e.g., to wait
  96    for carrier detect on a serial line).  It is also saved as an I/O
  97    operating mode, and after open has the following meaning.
  98
  99    When used in `io_*_openmodes' (and consequently `fcntl' with the F_SETFL
 100    command), the O_NONBLOCK flag means to do nonblocking i/o: any i/o
 101    operation that would block for any significant length of time will instead
 102    fail with EAGAIN.  */
 103
 104 #define O_NONBLOCK      0x0008  /* Non-blocking open or non-blocking I/O.  */
 105 #ifdef __USE_BSD
 106 # define O_NDELAY       O_NONBLOCK /* Deprecated.  */
 107 #endif
 108
 109
 110 #ifdef __USE_GNU
 111 /* Mask of bits which are understood by io servers.  */
 112 # define O_HURD         (0xffff | O_EXLOCK | O_SHLOCK)
 113 #endif
 114
 115
 116 /* Open-time action flags.  These are understood by `hurd_file_name_lookup'
 117    and consequently by `open' and `file_name_lookup'.  They are not preserved
 118    once the file has been opened.  */
 119
 120 #define O_TRUNC         0x00010000 /* Truncate file to zero length.  */
 121 #ifdef __USE_GNU
 122 # define O_CLOEXEC      0x00400000 /* Set FD_CLOEXEC.  */
 123 #endif
 124
 125
 126 /* Controlling terminal flags.  These are understood only by `open',
 127    and are not preserved once the file has been opened.  */
 128
 129 #ifdef __USE_GNU
 130 # define O_IGNORE_CTTY  0x00080000 /* Don't do any ctty magic at all.  */
 131 #endif
 132 /* `open' never assigns a controlling terminal in GNU.  */
 133 #define O_NOCTTY        0       /* Don't assign a controlling terminal.  */
 134
 135
 136 #ifdef __USE_BSD
 137 /* Bits in the file status flags returned by F_GETFL.  */
 138 # define FREAD          O_RDONLY
 139 # define FWRITE         O_WRONLY
 140
 141 /* Traditional BSD names the O_* bits.  */
 142 # define FASYNC         O_ASYNC
 143 # define FCREAT         O_CREAT
 144 # define FEXCL          O_EXCL
 145 # define FTRUNC         O_TRUNC
 146 # define FNOCTTY        O_NOCTTY
 147 # define FFSYNC         O_FSYNC
 148 # define FSYNC          O_SYNC
 149 # define FAPPEND        O_APPEND
 150 # define FNONBLOCK      O_NONBLOCK
 151 # define FNDELAY        O_NDELAY
 152 #endif
 153
 154
 155 /* Values for the second argument to `fcntl'.  */
 156 #define F_DUPFD         0       /* Duplicate file descriptor.  */
 157 #define F_GETFD         1       /* Get file descriptor flags.  */
 158 #define F_SETFD         2       /* Set file descriptor flags.  */
 159 #define F_GETFL         3       /* Get file status flags.  */
 160 #define F_SETFL         4       /* Set file status flags.  */
 161 #if defined __USE_BSD || defined __USE_UNIX98
 162 # define F_GETOWN       5       /* Get owner (receiver of SIGIO).  */
 163 # define F_SETOWN       6       /* Set owner (receiver of SIGIO).  */
 164 #endif
 165 #define F_GETLK         7       /* Get record locking info.  */
 166 #define F_SETLK         8       /* Set record locking info (non-blocking).  */
 167 #define F_SETLKW        9       /* Set record locking info (blocking).  */
 168
 169 #ifdef __USE_GNU
 170 # define F_DUPFD_CLOEXEC 1030   /* Duplicate, set FD_CLOEXEC on new one.  */
 171 #endif
 172
 173
 174 /* File descriptor flags used with F_GETFD and F_SETFD.  */
 175 #define FD_CLOEXEC      1       /* Close on exec.  */
 176
 177
 178 #include <bits/types.h>
 179
 180 /* The structure describing an advisory lock.  This is the type of the third
 181    argument to `fcntl' for the F_GETLK, F_SETLK, and F_SETLKW requests.  */
 182 struct flock
 183   {
 184     int l_type;         /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK.  */
 185     int l_whence;       /* Where `l_start' is relative to (like `lseek').  */
 186 #ifndef __USE_FILE_OFFSET64
 187     __off_t l_start;    /* Offset where the lock begins.  */
 188     __off_t l_len;      /* Size of the locked area; zero means until EOF.  */
 189 #else
 190     __off64_t l_start;  /* Offset where the lock begins.  */
 191     __off64_t l_len;    /* Size of the locked area; zero means until EOF.  */
 192 #endif
 193     __pid_t l_pid;      /* Process holding the lock.  */
 194   };
 195
 196 #ifdef __USE_LARGEFILE64
 197 struct flock64
 198   {
 199     int l_type;         /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK.  */
 200     int l_whence;       /* Where `l_start' is relative to (like `lseek').  */
 201     __off64_t l_start;  /* Offset where the lock begins.  */
 202     __off64_t l_len;    /* Size of the locked area; zero means until EOF.  */
 203     __pid_t l_pid;      /* Process holding the lock.  */
 204   };
 205 #endif
 206
 207 /* Values for the `l_type' field of a `struct flock'.  */
 208 #define F_RDLCK 1       /* Read lock.  */
 209 #define F_WRLCK 2       /* Write lock.  */
 210 #define F_UNLCK 3       /* Remove lock.  */
 211
 212 /* Advise to `posix_fadvise'.  */
 213 #ifdef __USE_XOPEN2K
 214 # define POSIX_FADV_NORMAL      0 /* No further special treatment.  */
 215 # define POSIX_FADV_RANDOM      1 /* Expect random page references.  */
 216 # define POSIX_FADV_SEQUENTIAL  2 /* Expect sequential page references.  */
 217 # define POSIX_FADV_WILLNEED    3 /* Will need these pages.  */
 218 # define POSIX_FADV_DONTNEED    4 /* Don't need these pages.  */
 219 # define POSIX_FADV_NOREUSE     5 /* Data will be accessed once.  */
 220 #endif