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

   1 /* O_*, F_*, FD_* bit values for Linux.
   2    Copyright (C) 1995, 1996, 1997 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 Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    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    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #ifndef _FCNTL_H
  21 # error "Never use <bits/fcntl.h> directly; include <fcntl.h> instead."
  22 #endif
  23
  24
  25 #include <sys/types.h>
  26
  27
  28 /* In GNU, read and write are bits (unlike BSD).  */
  29 #ifdef __USE_GNU
  30 # define O_READ         O_RDONLY /* Open for reading.  */
  31 # define O_WRITE        O_WRONLY /* Open for writing.  */
  32 #endif
  33 /* open/fcntl - O_SYNC is only implemented on blocks devices and on files
  34    located on an ext2 file system */
  35 #define O_ACCMODE         0003
  36 #define O_RDONLY            00
  37 #define O_WRONLY            01
  38 #define O_RDWR              02
  39 #define O_CREAT           0100  /* not fcntl */
  40 #define O_EXCL            0200  /* not fcntl */
  41 #define O_NOCTTY          0400  /* not fcntl */
  42 #define O_TRUNC          01000  /* not fcntl */
  43 #define O_APPEND         02000
  44 #define O_NONBLOCK       04000
  45 #define O_NDELAY        O_NONBLOCK
  46 #define O_SYNC          010000
  47 #define O_FSYNC         O_SYNC
  48 #define O_ASYNC         020000
  49
  50 /* XXX missing */
  51 #define O_LARGEFILE     0
  52
  53 /* Values for the second argument to `fcntl'.  */
  54 #define F_DUPFD         0       /* Duplicate file descriptor.  */
  55 #define F_GETFD         1       /* Get file descriptor flags.  */
  56 #define F_SETFD         2       /* Set file descriptor flags.  */
  57 #define F_GETFL         3       /* Get file status flags.  */
  58 #define F_SETFL         4       /* Set file status flags.  */
  59 #define F_GETLK         5       /* Get record locking info.  */
  60 #define F_SETLK         6       /* Set record locking info (non-blocking).  */
  61 #define F_SETLKW        7       /* Set record locking info (blocking).  */
  62
  63 /* XXX missing */
  64 #define F_GETLK64       5       /* Get record locking info.  */
  65 #define F_SETLK64       6       /* Set record locking info (non-blocking).  */
  66 #define F_SETLKW64      7       /* Set record locking info (blocking).  */
  67
  68 #ifdef __USE_BSD
  69 # define F_SETOWN       8       /* Get owner of socket (receiver of SIGIO).  */
  70 # define F_GETOWN       9       /* Set owner of socket (receiver of SIGIO).  */
  71 #endif
  72
  73 /* For F_[GET|SET]FL.  */
  74 #define FD_CLOEXEC      1       /* actually anything with low bit set goes */
  75
  76 /* For posix fcntl() and `l_type' field of a `struct flock' for lockf().  */
  77 #define F_RDLCK         0       /* Read lock.  */
  78 #define F_WRLCK         1       /* Write lock.  */
  79 #define F_UNLCK         2       /* Remove lock.  */
  80
  81 /* for old implementation of bsd flock () */
  82 #define F_EXLCK         4       /* or 3 */
  83 #define F_SHLCK         8       /* or 4 */
  84
  85 /* operations for bsd flock(), also used by the kernel implementation */
  86 #define LOCK_SH         1       /* shared lock */
  87 #define LOCK_EX         2       /* exclusive lock */
  88 #define LOCK_NB         4       /* or'd with one of the above to prevent
  89                                    blocking */
  90 #define LOCK_UN         8       /* remove lock */
  91
  92 struct flock
  93   {
  94     short int l_type;   /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK.  */
  95     short int l_whence; /* Where `l_start' is relative to (like `lseek').  */
  96 #ifndef __USE_FILE_OFFSET64
  97     __off_t l_start;    /* Offset where the lock begins.  */
  98     __off_t l_len;      /* Size of the locked area; zero means until EOF.  */
  99 #else
 100     __off64_t l_start;  /* Offset where the lock begins.  */
 101     __off64_t l_len;    /* Size of the locked area; zero means until EOF.  */
 102 #endif
 103     __pid_t l_pid;      /* Process holding the lock.  */
 104   };
 105
 106 #ifdef __USE_LARGEFILE64
 107 struct flock64
 108   {
 109     short int l_type;   /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK.  */
 110     short int l_whence; /* Where `l_start' is relative to (like `lseek').  */
 111     __off64_t l_start;  /* Offset where the lock begins.  */
 112     __off64_t l_len;    /* Size of the locked area; zero means until EOF.  */
 113     __pid_t l_pid;      /* Process holding the lock.  */
 114   };
 115 #endif
 116
 117 /* Define some more compatibility macros to be backward compatible with
 118    BSD systems which did not managed to hide these kernel macros.  */
 119 #ifdef  __USE_BSD
 120 # define FAPPEND        O_APPEND
 121 # define FFSYNC         O_FSYNC
 122 # define FASYNC         O_ASYNC
 123 # define FNONBLOCK      O_NONBLOCK
 124 # define FNDELAY        O_NDELAY
 125 #endif /* Use BSD.  */