1 /* O_*, F_*, FD_* bit values for System V.
2 Copyright (C) 1991, 1992, 1997 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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. */
22 #define _FCNTLBITS_H 1
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. */
31 /* Bits OR'd into the second argument to open. */
32 #define O_CREAT 00400 /* Create file if it doesn't exist. */
33 #define O_EXCL 02000 /* Fail if file already exists. */
34 #define O_TRUNC 01000 /* Truncate file to zero length. */
35 #if defined (__USE_BSD) || defined (__USE_SVID)
36 #define O_SYNC 00020 /* Synchronous writes. */
39 /* File status flags for `open' and `fcntl'. */
40 #define O_APPEND 000010 /* Writes append to the file. */
41 #define O_NONBLOCK 000004 /* Non-blocking I/O. */
44 /* System V doesn't support POSIX.1 O_NONBLOCK, but O_NDELAY is close. */
45 #define O_NDELAY O_NONBLOCK
48 /* Mask for file access modes. This is system-dependent in case
49 some system ever wants to define some other flavor of access. */
50 #define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR)
52 /* Values for the second argument to `fcntl'. */
53 #define F_DUPFD 0 /* Duplicate file descriptor. */
54 #define F_GETFD 1 /* Get file descriptor flags. */
55 #define F_SETFD 2 /* Set file descriptor flags. */
56 #define F_GETFL 3 /* Get file status flags. */
57 #define F_SETFL 4 /* Set file status flags. */
58 #define F_GETLK 5 /* Get record locking info. */
59 #define F_SETLK 6 /* Set record locking info. */
60 #define F_SETLKW 7 /* Set record locking info, wait. */
62 /* File descriptor flags used with F_GETFD and F_SETFD. */
63 #define FD_CLOEXEC 1 /* Close on exec. */
66 #include <gnu/types.h>
68 /* The structure describing an advisory lock. This is the type of the third
69 argument to `fcntl' for the F_GETLK, F_SETLK, and F_SETLKW requests. */
72 short int l_type
; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
73 short int l_whence
; /* Where `l_start' is relative to (like `lseek'). */
74 __off_t l_start
; /* Offset where the lock begins. */
75 __off_t l_len
; /* Size of the locked area; zero means until EOF. */
76 short int l_sysid
; /* System ID where locking process resides. */
77 short int l_pid
; /* Process holding the lock. */
80 /* Values for the `l_type' field of a `struct flock'. */
81 #define F_RDLCK 1 /* Read lock. */
82 #define F_WRLCK 2 /* Write lock. */
83 #define F_UNLCK 3 /* Remove lock. */
86 #endif /* fcntlbits.h */