sysdeps/unix/sysv/linux/i386/bits/fcntl.h

   1 /* O_*, F_*, FD_* bit values for Linux.
   2    Copyright (C) 1995, 1996, 1997, 1998, 2000, 2004
   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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #ifndef _FCNTL_H
  22 # error "Never use <bits/fcntl.h> directly; include <fcntl.h> instead."
  23 #endif
  24
  25
  26 #include <sys/types.h>
  27
  28 /* open/fcntl - O_SYNC is only implemented on blocks devices and on files
  29    located on an ext2 file system */
  30 #define O_ACCMODE          0003
  31 #define O_RDONLY             00
  32 #define O_WRONLY             01
  33 #define O_RDWR               02
  34 #define O_CREAT            0100 /* not fcntl */
  35 #define O_EXCL             0200 /* not fcntl */
  36 #define O_NOCTTY           0400 /* not fcntl */
  37 #define O_TRUNC           01000 /* not fcntl */
  38 #define O_APPEND          02000
  39 #define O_NONBLOCK        04000
  40 #define O_NDELAY        O_NONBLOCK
  41 #define O_SYNC           010000
  42 #define O_FSYNC          O_SYNC
  43 #define O_ASYNC          020000
  44
  45 #ifdef __USE_GNU
  46 # define O_DIRECT        040000 /* Direct disk access.  */
  47 # define O_DIRECTORY    0200000 /* Must be a directory.  */
  48 # define O_NOFOLLOW     0400000 /* Do not follow links.  */
  49 # define O_NOATIME     01000000 /* Do not set atime.  */
  50 #endif
  51
  52 /* For now Linux has synchronisity options for data and read operations.
  53    We define the symbols here but let them do the same as O_SYNC since
  54    this is a superset.  */
  55 #if defined __USE_POSIX199309 || defined __USE_UNIX98
  56 # define O_DSYNC        O_SYNC  /* Synchronize data.  */
  57 # define O_RSYNC        O_SYNC  /* Synchronize read operations.  */
  58 #endif
  59
  60 #ifdef __USE_LARGEFILE64
  61 # define O_LARGEFILE    0100000
  62 #endif
  63
  64 /* Values for the second argument to `fcntl'.  */
  65 #define F_DUPFD         0       /* Duplicate file descriptor.  */
  66 #define F_GETFD         1       /* Get file descriptor flags.  */
  67 #define F_SETFD         2       /* Set file descriptor flags.  */
  68 #define F_GETFL         3       /* Get file status flags.  */
  69 #define F_SETFL         4       /* Set file status flags.  */
  70 #ifndef __USE_FILE_OFFSET64
  71 # define F_GETLK        5       /* Get record locking info.  */
  72 # define F_SETLK        6       /* Set record locking info (non-blocking).  */
  73 # define F_SETLKW       7       /* Set record locking info (blocking).  */
  74 #else
  75 # define F_GETLK        F_GETLK64  /* Get record locking info.  */
  76 # define F_SETLK        F_SETLK64  /* Set record locking info (non-blocking).*/
  77 # define F_SETLKW       F_SETLKW64 /* Set record locking info (blocking).  */
  78 #endif
  79 #define F_GETLK64       12      /* Get record locking info.  */
  80 #define F_SETLK64       13      /* Set record locking info (non-blocking).  */
  81 #define F_SETLKW64      14      /* Set record locking info (blocking).  */
  82
  83 #if defined __USE_BSD || defined __USE_UNIX98
  84 # define F_SETOWN       8       /* Get owner of socket (receiver of SIGIO).  */
  85 # define F_GETOWN       9       /* Set owner of socket (receiver of SIGIO).  */
  86 #endif
  87
  88 #ifdef __USE_GNU
  89 # define F_SETSIG       10      /* Set number of signal to be sent.  */
  90 # define F_GETSIG       11      /* Get number of signal to be sent.  */
  91 #endif
  92
  93 #ifdef __USE_GNU
  94 # define F_SETLEASE     1024    /* Set a lease.  */
  95 # define F_GETLEASE     1025    /* Enquire what lease is active.  */
  96 # define F_NOTIFY       1026    /* Request notfications on a directory.  */
  97 #endif
  98
  99 /* For F_[GET|SET]FL.  */
 100 #define FD_CLOEXEC      1       /* actually anything with low bit set goes */
 101
 102 /* For posix fcntl() and `l_type' field of a `struct flock' for lockf().  */
 103 #define F_RDLCK         0       /* Read lock.  */
 104 #define F_WRLCK         1       /* Write lock.  */
 105 #define F_UNLCK         2       /* Remove lock.  */
 106
 107 /* For old implementation of bsd flock().  */
 108 #define F_EXLCK         4       /* or 3 */
 109 #define F_SHLCK         8       /* or 4 */
 110
 111 #ifdef __USE_BSD
 112 /* Operations for bsd flock(), also used by the kernel implementation.  */
 113 # define LOCK_SH        1       /* shared lock */
 114 # define LOCK_EX        2       /* exclusive lock */
 115 # define LOCK_NB        4       /* or'd with one of the above to prevent
 116                                    blocking */
 117 # define LOCK_UN        8       /* remove lock */
 118 #endif
 119
 120 #ifdef __USE_GNU
 121 # define LOCK_MAND      32      /* This is a mandatory flock:   */
 122 # define LOCK_READ      64      /* ... which allows concurrent read operations.  */
 123 # define LOCK_WRITE     128     /* ... which allows concurrent write operations.  */
 124 # define LOCK_RW        192     /* ... Which allows concurrent read & write operations.  */
 125 #endif
 126
 127 #ifdef __USE_GNU
 128 /* Types of directory notifications that may be requested with F_NOTIFY.  */
 129 # define DN_ACCESS      0x00000001      /* File accessed.  */
 130 # define DN_MODIFY      0x00000002      /* File modified.  */
 131 # define DN_CREATE      0x00000004      /* File created.  */
 132 # define DN_DELETE      0x00000008      /* File removed.  */
 133 # define DN_RENAME      0x00000010      /* File renamed.  */
 134 # define DN_ATTRIB      0x00000020      /* File changed attibutes.  */
 135 # define DN_MULTISHOT   0x80000000      /* Don't remove notifier.  */
 136 #endif
 137
 138 struct flock
 139   {
 140     short int l_type;   /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK.  */
 141     short int l_whence; /* Where `l_start' is relative to (like `lseek').  */
 142 #ifndef __USE_FILE_OFFSET64
 143     __off_t l_start;    /* Offset where the lock begins.  */
 144     __off_t l_len;      /* Size of the locked area; zero means until EOF.  */
 145 #else
 146     __off64_t l_start;  /* Offset where the lock begins.  */
 147     __off64_t l_len;    /* Size of the locked area; zero means until EOF.  */
 148 #endif
 149     __pid_t l_pid;      /* Process holding the lock.  */
 150   };
 151
 152 #ifdef __USE_LARGEFILE64
 153 struct flock64
 154   {
 155     short int l_type;   /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK.  */
 156     short int l_whence; /* Where `l_start' is relative to (like `lseek').  */
 157     __off64_t l_start;  /* Offset where the lock begins.  */
 158     __off64_t l_len;    /* Size of the locked area; zero means until EOF.  */
 159     __pid_t l_pid;      /* Process holding the lock.  */
 160   };
 161 #endif
 162
 163 /* Define some more compatibility macros to be backward compatible with
 164    BSD systems which did not managed to hide these kernel macros.  */
 165 #ifdef  __USE_BSD
 166 # define FAPPEND        O_APPEND
 167 # define FFSYNC         O_FSYNC
 168 # define FASYNC         O_ASYNC
 169 # define FNONBLOCK      O_NONBLOCK
 170 # define FNDELAY        O_NDELAY
 171 #endif /* Use BSD.  */
 172
 173 /* Advise to `posix_fadvise'.  */
 174 #ifdef __USE_XOPEN2K
 175 # define POSIX_FADV_NORMAL      0 /* No further special treatment.  */
 176 # define POSIX_FADV_RANDOM      1 /* Expect random page references.  */
 177 # define POSIX_FADV_SEQUENTIAL  2 /* Expect sequential page references.  */
 178 # define POSIX_FADV_WILLNEED    3 /* Will need these pages.  */
 179 # define POSIX_FADV_DONTNEED    4 /* Don't need these pages.  */
 180 # define POSIX_FADV_NOREUSE     5 /* Data will be accessed once.  */
 181 #endif
 182
 183 __BEGIN_DECLS
 184
 185 /* Provide kernel hint to read ahead.  */
 186 extern ssize_t readahead (int __fd, __off64_t __offset, size_t __count)
 187     __THROW;
 188
 189 __END_DECLS