about summary refs log tree commit diff
path: root/sysdeps/mach/hurd/fcntlbits.h
blob: 8a5e4cd52a63e2f9e951d4b72da3c2ac44c1cfcc (plain) (blame)
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
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
/* O_*, F_*, FD_* bit values for GNU.
Copyright (C) 1993, 1994 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

#ifndef	_FCNTLBITS_H

#define	_FCNTLBITS_H	1


/* File access modes.  These are understood by io servers; they can be
   passed in `dir_lookup', and are returned by `io_get_openmodes'.
   Consequently they can be passed to `open', `hurd_file_name_lookup', and
   `file_name_lookup'; and are returned by `fcntl' with the F_GETFL
   command.  */

/* In GNU, read and write are bits (unlike BSD).  */
#ifdef __USE_GNU
#define	O_READ		O_RDONLY /* Open for reading.  */
#define O_WRITE		O_WRONLY /* Open for writing.  */
#define	O_EXEC		0x0004	/* Open for execution.  */
#endif
/* POSIX.1 standard names.  */
#define	O_RDONLY	0x0001	/* Open read-only.  */
#define	O_WRONLY	0x0002	/* Open write-only.  */
#define	O_RDWR		(O_RDONLY|O_WRONLY) /* Open for reading and writing. */
#define	O_ACCMODE	O_RDWR	/* Mask for file access modes.  */



/* File name translation flags.  These are understood by io servers;
   they can be passed in `dir_lookup', and consequently to `open',
   `hurd_file_name_lookup', and `file_name_lookup'.  */

#define	O_CREAT		0x0010	/* Create file if it doesn't exist.  */
#define	O_EXCL		0x0020	/* Fail if file already exists.  */
#ifdef __USE_GNU
#define	O_NOLINK	0x0040	/* No name mappings on final component.  */
#define	O_NOTRANS	0x0080	/* No translator on final component. */
#endif


/* I/O operating modes.  These are understood by io servers; they can be
   passed in `dir_lookup' and set or fetched with `io_*_openmodes'.
   Consequently they can be passed to `open', `hurd_file_name_lookup',
   `file_name_lookup', and `fcntl' with the F_SETFL command; and are
   returned by `fcntl' with the F_GETFL command.  */

#define	O_APPEND	0x0100	/* Writes always append to the file.  */
#ifdef __USE_BSD
#define	O_ASYNC		0x0200	/* Send SIGIO to owner when data is ready.  */
#define	O_FSYNC		0x0400	/* Synchronous writes.  */
#define	O_SYNC		O_FSYNC
#endif
#ifdef __USE_GNU
#define	O_NOATIME	0x0800	/* Don't set access time on read (owner).  */
#endif


/* The name O_NONBLOCK is unfortunately overloaded; it is both a file name
   translation flag and an I/O operating mode.  O_NDELAY is the deprecated
   BSD name for the same flag, overloaded in the same way.

   When used in `dir_lookup' (and consequently `open', `hurd_file_name_lookup',
   or `file_name_lookup'), O_NONBLOCK says the open should return immediately
   instead of blocking for any significant length of time (e.g., to wait
   for carrier detect on a serial line).  It is also saved as an I/O
   operating mode, and after open has the following meaning.

   When used in `io_*_openmodes' (and consequently `fcntl' with the F_SETFL
   command), the O_NONBLOCK flag means to do nonblocking i/o: any i/o
   operation that would block for any significant length of time will instead
   fail with EAGAIN.  */

#define	O_NONBLOCK	0x0008	/* Non-blocking open or non-blocking I/O.  */
#ifdef __USE_BSD
#define	O_NDELAY	O_NONBLOCK /* Deprecated.  */
#endif


#ifdef __USE_GNU
/* Mask of bits which are understood by io servers.  */
#define O_HURD		0xffff	/* XXX name? want this? */
#endif


/* Open-time action flags.  These are understood by `hurd_file_name_lookup'
   and consequently by `open' and `file_name_lookup'.  They are not preserved
   once the file has been opened.  */

#define	O_TRUNC		0x00010000 /* Truncate file to zero length.  */
#ifdef	__USE_MISC
#define	O_SHLOCK	0x00020000 /* Open with shared file lock.  */
#define	O_EXLOCK	0x00040000 /* Open with exclusive file lock.  */
#endif


/* Controlling terminal flags.  These are understood only by `open',
   and are not preserved once the file has been opened.  */

#ifdef __USE_GNU
#define	O_IGNORE_CTTY	0x00080000 /* Don't do any ctty magic at all.  */
#endif
/* `open' never assigns a controlling terminal in GNU.  */
#define	O_NOCTTY	0	/* Don't assign a controlling terminal.  */


#ifdef __USE_BSD
/* Bits in the file status flags returned by F_GETFL.  */
#define FREAD		O_RDONLY
#define	FWRITE		O_WRONLY

/* Traditional BSD names the O_* bits.  */
#define FASYNC		O_ASYNC
#define FCREAT		O_CREAT
#define FEXCL		O_EXCL
#define FTRUNC		O_TRUNC
#define FNOCTTY		O_NOCTTY
#define FFSYNC		O_FSYNC
#define FSYNC		O_SYNC
#define FAPPEND		O_APPEND
#define FNONBLOCK	O_NONBLOCK
#define FNDELAY		O_NDELAY
#endif


/* 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.  */
#ifdef __USE_BSD
#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).  */

/* File descriptor flags used with F_GETFD and F_SETFD.  */
#define	FD_CLOEXEC	1	/* Close on exec.  */


#include <gnu/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
  {
    int l_type;		/* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK.  */
    int l_whence;	/* Where `l_start' is relative to (like `lseek').  */
    __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.  */
  };

/* 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.  */


#endif	/* fcntlbits.h */