Update.
[glibc.git] / bits / fcntl.h
blobb397f812f161680206a9f813f1e7d838c324469a
1 /* O_*, F_*, FD_* bit values for stub configuration.
2 Copyright (C) 1991, 1992, 1997, 2000, 2004 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 Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the 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 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 /* These values should be changed as appropriate for your system. */
22 #ifndef _FCNTL_H
23 # error "Never use <bits/fcntl.h> directly; include <fcntl.h> instead."
24 #endif
27 /* File access modes for `open' and `fcntl'. */
28 #define O_RDONLY 0 /* Open read-only. */
29 #define O_WRONLY 1 /* Open write-only. */
30 #define O_RDWR 2 /* Open read/write. */
33 /* Bits OR'd into the second argument to open. */
34 #define O_CREAT 0x0200 /* Create file if it doesn't exist. */
35 #define O_EXCL 0x0800 /* Fail if file already exists. */
36 #define O_TRUNC 0x0400 /* Truncate file to zero length. */
37 #define O_NOCTTY 0x0100 /* Don't assign a controlling terminal. */
39 /* File status flags for `open' and `fcntl'. */
40 #define O_APPEND 0x0008 /* Writes append to the file. */
41 #define O_NONBLOCK 0x0004 /* Non-blocking I/O. */
43 #ifdef __USE_BSD
44 # define O_NDELAY O_NONBLOCK
45 #endif
47 /* Mask for file access modes. This is system-dependent in case
48 some system ever wants to define some other flavor of access. */
49 #define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR)
51 /* Values for the second argument to `fcntl'. */
52 #define F_DUPFD 0 /* Duplicate file descriptor. */
53 #define F_GETFD 1 /* Get file descriptor flags. */
54 #define F_SETFD 2 /* Set file descriptor flags. */
55 #define F_GETFL 3 /* Get file status flags. */
56 #define F_SETFL 4 /* Set file status flags. */
57 #if defined __USE_BSD || defined __USE_UNIX98
58 # define F_GETOWN 5 /* Get owner (receiver of SIGIO). */
59 # define F_SETOWN 6 /* Set owner (receiver of SIGIO). */
60 #endif
61 #define F_GETLK 7 /* Get record locking info. */
62 #define F_SETLK 8 /* Set record locking info. */
63 #define F_SETLKW 9 /* Set record locking info, wait. */
65 /* File descriptor flags used with F_GETFD and F_SETFD. */
66 #define FD_CLOEXEC 1 /* Close on exec. */
69 #include <bits/types.h>
71 /* The structure describing an advisory lock. This is the type of the third
72 argument to `fcntl' for the F_GETLK, F_SETLK, and F_SETLKW requests. */
73 struct flock
75 short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
76 short int l_whence; /* Where `l_start' is relative to (like `lseek'). */
77 __off_t l_start; /* Offset where the lock begins. */
78 __off_t l_len; /* Size of the locked area; zero means until EOF. */
79 __pid_t l_pid; /* Process holding the lock. */
82 /* Values for the `l_type' field of a `struct flock'. */
83 #define F_RDLCK 1 /* Read lock. */
84 #define F_WRLCK 2 /* Write lock. */
85 #define F_UNLCK 3 /* Remove lock. */
87 /* Advise to `posix_fadvise'. */
88 #ifdef __USE_XOPEN2K
89 # define POSIX_FADV_NORMAL 0 /* No further special treatment. */
90 # define POSIX_FADV_RANDOM 1 /* Expect random page references. */
91 # define POSIX_FADV_SEQUENTIAL 2 /* Expect sequential page references. */
92 # define POSIX_FADV_WILLNEED 3 /* Will need these pages. */
93 # define POSIX_FADV_DONTNEED 4 /* Don't need these pages. */
94 # define POSIX_FADV_NOREUSE 5 /* Data will be accessed once. */
95 #endif