sysdeps/unix/bsd/fcntlbits.h

   1 /* O_*, F_*, FD_* bit values for 4.3 BSD.
   2 Copyright (C) 1991, 1992 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
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 #ifndef _FCNTLBITS_H
  21
  22 #define _FCNTLBITS_H    1
  23
  24
  25 /* File access modes for `open' and `fcntl'.  */
  26 #define O_RDONLY        0       /* Open read-only.  */
  27 #define O_WRONLY        1       /* Open write-only.  */
  28 #define O_RDWR          2       /* Open read/write.  */
  29
  30
  31 /* Bits OR'd into the second argument to open.  */
  32 #define O_CREAT         0x0200  /* Create file if it doesn't exist.  */
  33 #define O_EXCL          0x0800  /* Fail if file already exists.  */
  34 #define O_TRUNC         0x0400  /* Truncate file to zero length.  */
  35 /* Apparently not assigning a controlling terminal is the default
  36    behavior in BSD, so no bit is required to request that behavior.  */
  37 #define O_NOCTTY        0       /* Don't assign a controlling terminal.  */
  38 #if     defined (__USE_BSD) || defined (__USE_SVID)
  39 #define O_ASYNC         0x0040  /* Send SIGIO to owner when data is ready.  */
  40 #define O_FSYNC         0x2000  /* Synchronous writes.  */
  41 #define O_SYNC          O_FSYNC
  42 #endif
  43
  44 /* File status flags for `open' and `fcntl'.  */
  45 #define O_APPEND        0x0008  /* Writes append to the file.  */
  46 #define O_NONBLOCK      0x0004  /* Non-blocking I/O.  */
  47
  48 #ifdef __USE_BSD
  49 /* BSD before 4.4 doesn't support POSIX.1 O_NONBLOCK,
  50    but O_NDELAY is close.  */
  51 #define O_NDELAY        O_NONBLOCK
  52 #endif
  53
  54 #ifdef __USE_BSD
  55 /* Bits in the file status flags returned by F_GETFL.
  56    These are all the O_* flags, plus FREAD and FWRITE, which are
  57    independent bits set by which of O_RDONLY, O_WRONLY, and O_RDWR, was
  58    given to `open'.  */
  59 #define FREAD           1
  60 #define FWRITE          2
  61
  62 /* Traditional BSD names the O_* bits.  */
  63 #define FASYNC          O_ASYNC
  64 #define FCREAT          O_CREAT
  65 #define FEXCL           O_EXCL
  66 #define FTRUNC          O_TRUNC
  67 #define FNOCTTY         O_NOCTTY
  68 #define FFSYNC          O_FSYNC
  69 #define FSYNC           O_SYNC
  70 #define FAPPEND         O_APPEND
  71 #define FNONBLOCK       O_NONBLOCK
  72 #define FNDELAY         O_NDELAY
  73 #endif
  74
  75 /* Mask for file access modes.  This is system-dependent in case
  76    some system ever wants to define some other flavor of access.  */
  77 #define O_ACCMODE       (O_RDONLY|O_WRONLY|O_RDWR)
  78
  79 /* Values for the second argument to `fcntl'.  */
  80 #define F_DUPFD         0       /* Duplicate file descriptor.  */
  81 #define F_GETFD         1       /* Get file descriptor flags.  */
  82 #define F_SETFD         2       /* Set file descriptor flags.  */
  83 #define F_GETFL         3       /* Get file status flags.  */
  84 #define F_SETFL         4       /* Set file status flags.  */
  85 #ifdef __USE_BSD
  86 #define F_GETOWN        5       /* Get owner (receiver of SIGIO).  */
  87 #define F_SETOWN        6       /* Set owner (receiver of SIGIO).  */
  88 #endif
  89 #define F_GETLK         7       /* Get record locking info.  */
  90 #define F_SETLK         8       /* Set record locking info (non-blocking).  */
  91 #define F_SETLKW        9       /* Set record locking info (blocking).  */
  92
  93 /* File descriptor flags used with F_GETFD and F_SETFD.  */
  94 #define FD_CLOEXEC      1       /* Close on exec.  */
  95
  96
  97 #include <gnu/types.h>
  98
  99 /* The structure describing an advisory lock.  This is the type of the third
 100    argument to `fcntl' for the F_GETLK, F_SETLK, and F_SETLKW requests.  */
 101 struct flock
 102   {
 103     short int l_type;   /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK.  */
 104     short int l_whence; /* Where `l_start' is relative to (like `lseek').  */
 105     __off_t l_start;    /* Offset where the lock begins.  */
 106     __off_t l_len;      /* Size of the locked area; zero means until EOF.  */
 107     short int l_pid;    /* Process holding the lock.  */
 108     short int l_xxx;    /* Reserved for future use.  */
 109   };
 110
 111 /* Values for the `l_type' field of a `struct flock'.  */
 112 #define F_RDLCK 1       /* Read lock.  */
 113 #define F_WRLCK 2       /* Write lock.  */
 114 #define F_UNLCK 3       /* Remove lock.  */
 115
 116
 117 #endif  /* fcntlbits.h */