sysdeps/unix/sysv/linux/fcntlbits.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 _FCNTLBITS_H
  21 #define _FCNTLBITS_H    1
  22
  23 #include <sys/types.h>
  24
  25
  26 /* In GNU, read and write are bits (unlike BSD).  */
  27 #ifdef __USE_GNU
  28 #define O_READ          O_RDONLY /* Open for reading.  */
  29 #define O_WRITE         O_WRONLY /* Open for writing.  */
  30 #endif
  31 /* open/fcntl - O_SYNC is only implemented on blocks devices and on files
  32    located on an ext2 file system */
  33 #define O_ACCMODE         0003
  34 #define O_RDONLY            00
  35 #define O_WRONLY            01
  36 #define O_RDWR              02
  37 #define O_CREAT           0100  /* not fcntl */
  38 #define O_EXCL            0200  /* not fcntl */
  39 #define O_NOCTTY          0400  /* not fcntl */
  40 #define O_TRUNC          01000  /* not fcntl */
  41 #define O_APPEND         02000
  42 #define O_NONBLOCK       04000
  43 #define O_NDELAY        O_NONBLOCK
  44 #define O_SYNC          010000
  45 #define O_FSYNC         O_SYNC
  46 #define O_ASYNC         020000
  47
  48 #define F_DUPFD         0       /* dup */
  49 #define F_GETFD         1       /* get f_flags */
  50 #define F_SETFD         2       /* set f_flags */
  51 #define F_GETFL         3       /* more flags (cloexec) */
  52 #define F_SETFL         4
  53 #define F_GETLK         5
  54 #define F_SETLK         6
  55 #define F_SETLKW        7
  56
  57 #define F_SETOWN        8       /*  for sockets. */
  58 #define F_GETOWN        9       /*  for sockets. */
  59
  60 /* for F_[GET|SET]FL */
  61 #define FD_CLOEXEC      1       /* actually anything with low bit set goes */
  62
  63 /* for posix fcntl() and lockf() */
  64 #define F_RDLCK         0
  65 #define F_WRLCK         1
  66 #define F_UNLCK         2
  67
  68 /* for old implementation of bsd flock () */
  69 #define F_EXLCK         4       /* or 3 */
  70 #define F_SHLCK         8       /* or 4 */
  71
  72 /* operations for bsd flock(), also used by the kernel implementation */
  73 #define LOCK_SH         1       /* shared lock */
  74 #define LOCK_EX         2       /* exclusive lock */
  75 #define LOCK_NB         4       /* or'd with one of the above to prevent
  76                                    blocking */
  77 #define LOCK_UN         8       /* remove lock */
  78
  79 struct flock
  80   {
  81     short int l_type;
  82     short int l_whence;
  83     __off_t l_start;
  84     __off_t l_len;
  85     __pid_t l_pid;
  86   };
  87
  88
  89 /* Define some more compatibility macros to be backward compatible with
  90    BSD systems which did not managed to hide these kernel macros.  */
  91 #ifdef  __USE_BSD
  92 #define FAPPEND         O_APPEND
  93 #define FFSYNC          O_FSYNC
  94 #define FASYNC          O_ASYNC
  95 #define FNONBLOCK       O_NONBLOCK
  96 #define FNDELAY         O_NDELAY
  97 #endif /* Use BSD.  */
  98
  99 #endif  /* fcntlbits.h */