migration: convert unix socket protocol to use QIOChannel
[qemu.git] / migration / qemu-file-internal.h
1 /*
2 * QEMU System Emulator
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25 #ifndef QEMU_FILE_INTERNAL_H
26 #define QEMU_FILE_INTERNAL_H 1
27
28 #include "qemu-common.h"
29 #include "qemu/iov.h"
30
31 #define IO_BUF_SIZE 32768
32 #define MAX_IOV_SIZE MIN(IOV_MAX, 64)
33
34 struct QEMUFile {
35 const QEMUFileOps *ops;
36 const QEMUFileHooks *hooks;
37 void *opaque;
38
39 int64_t bytes_xfer;
40 int64_t xfer_limit;
41
42 int64_t pos; /* start of buffer when writing, end of buffer
43 when reading */
44 int buf_index;
45 int buf_size; /* 0 when writing */
46 uint8_t buf[IO_BUF_SIZE];
47
48 struct iovec iov[MAX_IOV_SIZE];
49 unsigned int iovcnt;
50
51 int last_error;
52 };
53
54 #endif