sysdeps/unix/common/fcntlbits.h

   1 /* O_*, F_*, FD_* bit values for general Unix system.
   2    Copyright (C) 1991, 1992, 1995, 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
  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         0x0100  /* Create file if it doesn't exist.  */
  33 #define O_EXCL          0x0400  /* Fail if file already exists.  */
  34 #define O_TRUNC         0x0200  /* Truncate file to zero length.  */
  35 #define O_NOCTTY        0x0800  /* Don't assign a controlling terminal.  */
  36 #ifdef  __USE_MISC
  37 #define O_ASYNC         0x0040  /* Send SIGIO to owner when data is ready.  */
  38 #define O_FSYNC         0x0010  /* Synchronous writes.  */
  39 #define O_SYNC          O_FSYNC
  40 #endif
  41
  42 /* File status flags for `open' and `fcntl'.  */
  43 #define O_APPEND        0x0008  /* Writes append to the file.  */
  44 #define O_NONBLOCK      0x0080  /* Non-blocking I/O.  */
  45
  46 #ifdef __USE_MISC
  47 #define O_NDELAY        0x0004
  48 #endif
  49
  50 #ifdef __USE_MISC
  51 /* Bits in the file status flags returned by F_GETFL.
  52    These are all the O_* flags, plus FREAD and FWRITE, which are
  53    independent bits set by which of O_RDONLY, O_WRONLY, and O_RDWR, was
  54    given to `open'.  */
  55 #define FREAD           1
  56 #define FWRITE          2
  57
  58 /* Traditional Unix names the O_* bits.  */
  59 #define FASYNC          O_ASYNC
  60 #define FCREAT          O_CREAT
  61 #define FEXCL           O_EXCL
  62 #define FTRUNC          O_TRUNC
  63 #define FNOCTTY         O_NOCTTY
  64 #define FFSYNC          O_FSYNC
  65 #define FSYNC           O_SYNC
  66 #define FAPPEND         O_APPEND
  67 #define FNONBLOCK       O_NONBLOCK
  68 #define FNONBIO         O_NONBLOCK
  69 #define FNDELAY         O_NDELAY
  70 #endif
  71
  72 /* Mask for file access modes.  This is system-dependent in case
  73    some system ever wants to define some other flavor of access.  */
  74 #define O_ACCMODE       (O_RDONLY|O_WRONLY|O_RDWR)
  75
  76 /* Values for the second argument to `fcntl'.  */
  77 #define F_DUPFD         0       /* Duplicate file descriptor.  */
  78 #define F_GETFD         1       /* Get file descriptor flags.  */
  79 #define F_SETFD         2       /* Set file descriptor flags.  */
  80 #define F_GETFL         3       /* Get file status flags.  */
  81 #define F_SETFL         4       /* Set file status flags.  */
  82 #ifdef __USE_BSD
  83 #define F_GETOWN        23      /* Get owner (receiver of SIGIO).  */
  84 #define F_SETOWN        24      /* Set owner (receiver of SIGIO).  */
  85 #endif
  86 #define F_GETLK         14      /* Get record locking info.  */
  87 #define F_SETLK         6       /* Set record locking info (non-blocking).  */
  88 #define F_SETLKW        7       /* Set record locking info (blocking).  */
  89 #ifdef  __USE_SVID
  90 #define F_ALLOCSP       10      /* Allocate space in the file.  */
  91 #define F_FREESP        11      /* Free space in the file.  */
  92 #define F_RGETLK        20      /* Get remote record locking info.  */
  93 #define F_RSETLK        21      /* Set remote locking info (non-blocking).  */
  94 #define F_RSETLKW       22      /* Set remote locking info (blocking).  */
  95 #endif
  96
  97 /* File descriptor flags used with F_GETFD and F_SETFD.  */
  98 #define FD_CLOEXEC      1       /* Close on exec.  */
  99
 100
 101 #include <gnu/types.h>
 102
 103 /* The structure describing an advisory lock.  This is the type of the third
 104    argument to `fcntl' for the F_GETLK, F_SETLK, and F_SETLKW requests.  */
 105 struct flock
 106   {
 107     short int l_type;   /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK.  */
 108     short int l_whence; /* Where `l_start' is relative to (like `lseek').  */
 109     __off_t l_start;    /* Offset where the lock begins.  */
 110     __off_t l_len;      /* Size of the locked area; zero means until EOF.  */
 111     long int l_sysid;   /* System ID where locking process resides.  */
 112     __pid_t l_pid;      /* Process holding the lock.  */
 113     long int pad[4];    /* Reserved for future use.  */
 114   };
 115
 116 /* Values for the `l_type' field of a `struct flock'.  */
 117 #define F_RDLCK 1       /* Read lock.  */
 118 #define F_WRLCK 2       /* Write lock.  */
 119 #define F_UNLCK 3       /* Remove lock.  */
 120
 121
 122 #endif  /* fcntlbits.h */