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1/* O_*, F_*, FD_* bit values. 4.4BSD/Generic version.
2 Copyright (C) 1991-2019 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 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.
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 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#ifndef _FCNTL_H
20#error "Never use <bits/fcntl.h> directly; include <fcntl.h> instead."
21#endif
22
23
24/* File access modes for `open' and `fcntl'. */
25#define O_RDONLY 0 /* Open read-only. */
26#define O_WRONLY 1 /* Open write-only. */
27#define O_RDWR 2 /* Open read/write. */
28
29
30/* Bits OR'd into the second argument to open. */
31#define O_CREAT 0x0200 /* Create file if it doesn't exist. */
32#define O_EXCL 0x0800 /* Fail if file already exists. */
33#define O_TRUNC 0x0400 /* Truncate file to zero length. */
34#define O_NOCTTY 0x8000 /* Don't assign a controlling terminal. */
35#define O_ASYNC 0x0040 /* Send SIGIO to owner when data is ready. */
36#define O_FSYNC 0x0080 /* Synchronous writes. */
37#define O_SYNC O_FSYNC
38#ifdef __USE_MISC
39#define O_SHLOCK 0x0010 /* Open with shared file lock. */
40#define O_EXLOCK 0x0020 /* Open with shared exclusive lock. */
41#endif
42#ifdef __USE_XOPEN2K8
43# define O_DIRECTORY 0x00200000 /* Must be a directory. */
44# define O_NOFOLLOW 0x00000100 /* Do not follow links. */
45# define O_CLOEXEC 0x00400000 /* Set close_on_exec. */
46#endif
47#if defined __USE_POSIX199309 || defined __USE_UNIX98
48# define O_DSYNC 0x00010000 /* Synchronize data. */
49# define O_RSYNC 0x00020000 /* Synchronize read operations. */
50#endif
51
52/* All opens support large file sizes, so there is no flag bit for this. */
53#ifdef __USE_LARGEFILE64
54# define O_LARGEFILE 0
55#endif
56
57/* File status flags for `open' and `fcntl'. */
58#define O_APPEND 0x0008 /* Writes append to the file. */
59#define O_NONBLOCK 0x0004 /* Non-blocking I/O. */
60
61#ifdef __USE_MISC
62# define O_NDELAY O_NONBLOCK
63#endif
64
65#ifdef __USE_MISC
66/* Flags for TIOCFLUSH. */
67# define FREAD 1
68# define FWRITE 2
69
70/* Traditional BSD names the O_* bits. */
71# define FASYNC O_ASYNC
72# define FFSYNC O_FSYNC
73# define FSYNC O_SYNC
74# define FAPPEND O_APPEND
75# define FNDELAY O_NDELAY
76#endif
77
78/* Mask for file access modes. This is system-dependent in case
79 some system ever wants to define some other flavor of access. */
80#define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR)
81
82/* Values for the second argument to `fcntl'. */
83#define F_DUPFD 0 /* Duplicate file descriptor. */
84#define F_GETFD 1 /* Get file descriptor flags. */
85#define F_SETFD 2 /* Set file descriptor flags. */
86#define F_GETFL 3 /* Get file status flags. */
87#define F_SETFL 4 /* Set file status flags. */
88#if defined __USE_UNIX98 || defined __USE_XOPEN2K8
89#define F_GETOWN 5 /* Get owner (receiver of SIGIO). */
90#define F_SETOWN 6 /* Set owner (receiver of SIGIO). */
91#endif
92#define F_GETLK 7 /* Get record locking info. */
93#define F_SETLK 8 /* Set record locking info (non-blocking). */
94#define F_SETLKW 9 /* Set record locking info (blocking). */
95/* Not necessary, we always have 64-bit offsets. */
96#define F_GETLK64 F_GETLK /* Get record locking info. */
97#define F_SETLK64 F_SETLK /* Set record locking info (non-blocking). */
98#define F_SETLKW64 F_SETLKW/* Set record locking info (blocking). */
99#ifdef __USE_XOPEN2K8
100# define F_DUPFD_CLOEXEC 12 /* Duplicate file descriptor with
101 close-on-exit set. */
102#endif
103
104/* File descriptor flags used with F_GETFD and F_SETFD. */
105#define FD_CLOEXEC 1 /* Close on exec. */
106
107
108#include <bits/types.h>
109
110/* The structure describing an advisory lock. This is the type of the third
111 argument to `fcntl' for the F_GETLK, F_SETLK, and F_SETLKW requests. */
112struct flock
113 {
114 __off_t l_start; /* Offset where the lock begins. */
115 __off_t l_len; /* Size of the locked area; zero means until EOF. */
116 __pid_t l_pid; /* Process holding the lock. */
117 short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
118 short int l_whence; /* Where `l_start' is relative to (like `lseek'). */
119 };
120
121#ifdef __USE_LARGEFILE64
122/* Note this matches struct flock exactly. */
123struct flock64
124 {
125 __off_t l_start; /* Offset where the lock begins. */
126 __off_t l_len; /* Size of the locked area; zero means until EOF. */
127 __pid_t l_pid; /* Process holding the lock. */
128 short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
129 short int l_whence; /* Where `l_start' is relative to (like `lseek'). */
130 };
131#endif
132
133/* Values for the `l_type' field of a `struct flock'. */
134#define F_RDLCK 1 /* Read lock. */
135#define F_WRLCK 2 /* Write lock. */
136#define F_UNLCK 3 /* Remove lock. */
137
138/* Advise to `posix_fadvise'. */
139#ifdef __USE_XOPEN2K
140# define POSIX_FADV_NORMAL 0 /* No further special treatment. */
141# define POSIX_FADV_RANDOM 1 /* Expect random page references. */
142# define POSIX_FADV_SEQUENTIAL 2 /* Expect sequential page references. */
143# define POSIX_FADV_WILLNEED 3 /* Will need these pages. */
144# define POSIX_FADV_DONTNEED 4 /* Don't need these pages. */
145# define POSIX_FADV_NOREUSE 5 /* Data will be accessed once. */
146#endif
147

Warning: That file was not part of the compilation database. It may have many parsing errors.