aboutsummaryrefslogtreecommitdiff
path: root/include/io/channel-file.h
blob: 50e8eb11386840bdceab555c5da87a8f0505ef91 (plain)
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
/*
 * QEMU I/O channels files driver
 *
 * Copyright (c) 2015 Red Hat, Inc.
 *
 * This 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.
 *
 * This 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 this library; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef QIO_CHANNEL_FILE_H
#define QIO_CHANNEL_FILE_H

#include "io/channel.h"
#include "qom/object.h"

#define TYPE_QIO_CHANNEL_FILE "qio-channel-file"
OBJECT_DECLARE_SIMPLE_TYPE(QIOChannelFile, QIO_CHANNEL_FILE)


/**
 * QIOChannelFile:
 *
 * The QIOChannelFile object provides a channel implementation
 * that is able to perform I/O on block devices, character
 * devices, FIFOs, pipes and plain files. While it is technically
 * able to work on sockets too on the UNIX platform, this is not
 * portable to Windows and lacks some extra sockets specific
 * functionality. So the QIOChannelSocket object is recommended
 * for that use case.
 *
 */

struct QIOChannelFile {
    QIOChannel parent;
    int fd;
};


/**
 * qio_channel_file_new_fd:
 * @fd: the file descriptor
 *
 * Create a new IO channel object for a file represented
 * by the @fd parameter. @fd can be associated with a
 * block device, character device, fifo, pipe, or a
 * regular file. For sockets, the QIOChannelSocket class
 * should be used instead, as this provides greater
 * functionality and cross platform portability.
 *
 * The channel will own the passed in file descriptor
 * and will take responsibility for closing it, so the
 * caller must not close it. If appropriate the caller
 * should dup() its FD before opening the channel.
 *
 * Returns: the new channel object
 */
QIOChannelFile *
qio_channel_file_new_fd(int fd);

/**
 * qio_channel_file_new_path:
 * @path: the file path
 * @flags: the open flags (O_RDONLY|O_WRONLY|O_RDWR, etc)
 * @mode: the file creation mode if O_CREAT is set in @flags
 * @errp: pointer to initialized error object
 *
 * Create a new IO channel object for a file represented
 * by the @path parameter. @path can point to any
 * type of file on which sequential I/O can be
 * performed, whether it be a plain file, character
 * device or block device.
 *
 * Returns: the new channel object
 */
QIOChannelFile *
qio_channel_file_new_path(const char *path,
                          int flags,
                          mode_t mode,
                          Error **errp);

#endif /* QIO_CHANNEL_FILE_H */