1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
/* O_*, F_*, FD_* bit values. 4.4BSD/Generic version.
Copyright (C) 1991-2014 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#ifndef _FCNTL_H
#error "Never use <bits/fcntl.h> directly; include <fcntl.h> instead."
#endif
/* File access modes for `open' and `fcntl'. */
#define O_RDONLY 0 /* Open read-only. */
#define O_WRONLY 1 /* Open write-only. */
#define O_RDWR 2 /* Open read/write. */
/* Bits OR'd into the second argument to open. */
#define O_CREAT 0x0200 /* Create file if it doesn't exist. */
#define O_EXCL 0x0800 /* Fail if file already exists. */
#define O_TRUNC 0x0400 /* Truncate file to zero length. */
#define O_NOCTTY 0x8000 /* Don't assign a controlling terminal. */
#define O_ASYNC 0x0040 /* Send SIGIO to owner when data is ready. */
#define O_FSYNC 0x0080 /* Synchronous writes. */
#define O_SYNC O_FSYNC
#ifdef __USE_MISC
#define O_SHLOCK 0x0010 /* Open with shared file lock. */
#define O_EXLOCK 0x0020 /* Open with shared exclusive lock. */
#endif
#ifdef __USE_XOPEN2K8
# define O_DIRECTORY 0x00200000 /* Must be a directory. */
# define O_NOFOLLOW 0x00000100 /* Do not follow links. */
# define O_CLOEXEC 0x00400000 /* Set close_on_exec. */
#endif
#if defined __USE_POSIX199309 || defined __USE_UNIX98
# define O_DSYNC 0x00010000 /* Synchronize data. */
# define O_RSYNC 0x00020000 /* Synchronize read operations. */
#endif
/* All opens support large file sizes, so there is no flag bit for this. */
#ifdef __USE_LARGEFILE64
# define O_LARGEFILE 0
#endif
/* File status flags for `open' and `fcntl'. */
#define O_APPEND 0x0008 /* Writes append to the file. */
#define O_NONBLOCK 0x0004 /* Non-blocking I/O. */
#ifdef __USE_MISC
# define O_NDELAY O_NONBLOCK
#endif
#ifdef __USE_MISC
/* Bits in the file status flags returned by F_GETFL.
These are all the O_* flags, plus FREAD and FWRITE, which are
independent bits set by which of O_RDONLY, O_WRONLY, and O_RDWR, was
given to `open'. */
# define FREAD 1
# define FWRITE 2
/* Traditional BSD names the O_* bits. */
# define FASYNC O_ASYNC
# define FFSYNC O_FSYNC
# define FSYNC O_SYNC
# define FAPPEND O_APPEND
# define FNDELAY O_NDELAY
#endif
/* Mask for file access modes. This is system-dependent in case
some system ever wants to define some other flavor of access. */
#define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR)
/* Values for the second argument to `fcntl'. */
#define F_DUPFD 0 /* Duplicate file descriptor. */
#define F_GETFD 1 /* Get file descriptor flags. */
#define F_SETFD 2 /* Set file descriptor flags. */
#define F_GETFL 3 /* Get file status flags. */
#define F_SETFL 4 /* Set file status flags. */
#if defined __USE_MISC || defined __USE_UNIX98 || defined __USE_XOPEN2K8
#define F_GETOWN 5 /* Get owner (receiver of SIGIO). */
#define F_SETOWN 6 /* Set owner (receiver of SIGIO). */
#endif
#define F_GETLK 7 /* Get record locking info. */
#define F_SETLK 8 /* Set record locking info (non-blocking). */
#define F_SETLKW 9 /* Set record locking info (blocking). */
/* Not necessary, we always have 64-bit offsets. */
#define F_GETLK64 F_GETLK /* Get record locking info. */
#define F_SETLK64 F_SETLK /* Set record locking info (non-blocking). */
#define F_SETLKW64 F_SETLKW/* Set record locking info (blocking). */
#ifdef __USE_XOPEN2K8
# define F_DUPFD_CLOEXEC 12 /* Duplicate file descriptor with
close-on-exit set. */
#endif
/* File descriptor flags used with F_GETFD and F_SETFD. */
#define FD_CLOEXEC 1 /* Close on exec. */
#include <bits/types.h>
/* The structure describing an advisory lock. This is the type of the third
argument to `fcntl' for the F_GETLK, F_SETLK, and F_SETLKW requests. */
struct flock
{
__off_t l_start; /* Offset where the lock begins. */
__off_t l_len; /* Size of the locked area; zero means until EOF. */
__pid_t l_pid; /* Process holding the lock. */
short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
short int l_whence; /* Where `l_start' is relative to (like `lseek'). */
};
#ifdef __USE_LARGEFILE64
/* Note this matches struct flock exactly. */
struct flock64
{
__off_t l_start; /* Offset where the lock begins. */
__off_t l_len; /* Size of the locked area; zero means until EOF. */
__pid_t l_pid; /* Process holding the lock. */
short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
short int l_whence; /* Where `l_start' is relative to (like `lseek'). */
};
#endif
/* Values for the `l_type' field of a `struct flock'. */
#define F_RDLCK 1 /* Read lock. */
#define F_WRLCK 2 /* Write lock. */
#define F_UNLCK 3 /* Remove lock. */
/* Advise to `posix_fadvise'. */
#ifdef __USE_XOPEN2K
# define POSIX_FADV_NORMAL 0 /* No further special treatment. */
# define POSIX_FADV_RANDOM 1 /* Expect random page references. */
# define POSIX_FADV_SEQUENTIAL 2 /* Expect sequential page references. */
# define POSIX_FADV_WILLNEED 3 /* Will need these pages. */
# define POSIX_FADV_DONTNEED 4 /* Don't need these pages. */
# define POSIX_FADV_NOREUSE 5 /* Data will be accessed once. */
#endif
|
