aboutsummaryrefslogtreecommitdiff
path: root/migration/qemu-file-channel.c
blob: e202d73834dace64ca4e67ec1fcff3ca58db0f87 (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
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
179
180
181
182
/*
 * QEMUFile backend for QIOChannel objects
 *
 * Copyright (c) 2015-2016 Red Hat, Inc
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "qemu/osdep.h"
#include "qemu-file-channel.h"
#include "exec/cpu-common.h"
#include "qemu-file.h"
#include "io/channel-socket.h"
#include "qemu/iov.h"


static ssize_t channel_writev_buffer(void *opaque,
                                     struct iovec *iov,
                                     int iovcnt,
                                     int64_t pos)
{
    QIOChannel *ioc = QIO_CHANNEL(opaque);
    ssize_t done = 0;
    struct iovec *local_iov = g_new(struct iovec, iovcnt);
    struct iovec *local_iov_head = local_iov;
    unsigned int nlocal_iov = iovcnt;

    nlocal_iov = iov_copy(local_iov, nlocal_iov,
                          iov, iovcnt,
                          0, iov_size(iov, iovcnt));

    while (nlocal_iov > 0) {
        ssize_t len;
        len = qio_channel_writev(ioc, local_iov, nlocal_iov, NULL);
        if (len == QIO_CHANNEL_ERR_BLOCK) {
            qio_channel_wait(ioc, G_IO_OUT);
            continue;
        }
        if (len < 0) {
            /* XXX handle Error objects */
            done = -EIO;
            goto cleanup;
        }

        iov_discard_front(&local_iov, &nlocal_iov, len);
        done += len;
    }

 cleanup:
    g_free(local_iov_head);
    return done;
}


static ssize_t channel_get_buffer(void *opaque,
                                  uint8_t *buf,
                                  int64_t pos,
                                  size_t size)
{
    QIOChannel *ioc = QIO_CHANNEL(opaque);
    ssize_t ret;

    do {
        ret = qio_channel_read(ioc, (char *)buf, size, NULL);
        if (ret < 0) {
            if (ret == QIO_CHANNEL_ERR_BLOCK) {
                qio_channel_yield(ioc, G_IO_IN);
            } else {
                /* XXX handle Error * object */
                return -EIO;
            }
        }
    } while (ret == QIO_CHANNEL_ERR_BLOCK);

    return ret;
}


static int channel_close(void *opaque)
{
    QIOChannel *ioc = QIO_CHANNEL(opaque);
    qio_channel_close(ioc, NULL);
    object_unref(OBJECT(ioc));
    return 0;
}


static int channel_shutdown(void *opaque,
                            bool rd,
                            bool wr)
{
    QIOChannel *ioc = QIO_CHANNEL(opaque);

    if (qio_channel_has_feature(ioc,
                                QIO_CHANNEL_FEATURE_SHUTDOWN)) {
        QIOChannelShutdown mode;
        if (rd && wr) {
            mode = QIO_CHANNEL_SHUTDOWN_BOTH;
        } else if (rd) {
            mode = QIO_CHANNEL_SHUTDOWN_READ;
        } else {
            mode = QIO_CHANNEL_SHUTDOWN_WRITE;
        }
        if (qio_channel_shutdown(ioc, mode, NULL) < 0) {
            /* XXX handler Error * object */
            return -EIO;
        }
    }
    return 0;
}


static int channel_set_blocking(void *opaque,
                                bool enabled)
{
    QIOChannel *ioc = QIO_CHANNEL(opaque);

    if (qio_channel_set_blocking(ioc, enabled, NULL) < 0) {
        return -1;
    }
    return 0;
}

static QEMUFile *channel_get_input_return_path(void *opaque)
{
    QIOChannel *ioc = QIO_CHANNEL(opaque);

    return qemu_fopen_channel_output(ioc);
}

static QEMUFile *channel_get_output_return_path(void *opaque)
{
    QIOChannel *ioc = QIO_CHANNEL(opaque);

    return qemu_fopen_channel_input(ioc);
}

static const QEMUFileOps channel_input_ops = {
    .get_buffer = channel_get_buffer,
    .close = channel_close,
    .shut_down = channel_shutdown,
    .set_blocking = channel_set_blocking,
    .get_return_path = channel_get_input_return_path,
};


static const QEMUFileOps channel_output_ops = {
    .writev_buffer = channel_writev_buffer,
    .close = channel_close,
    .shut_down = channel_shutdown,
    .set_blocking = channel_set_blocking,
    .get_return_path = channel_get_output_return_path,
};


QEMUFile *qemu_fopen_channel_input(QIOChannel *ioc)
{
    object_ref(OBJECT(ioc));
    return qemu_fopen_ops(ioc, &channel_input_ops);
}

QEMUFile *qemu_fopen_channel_output(QIOChannel *ioc)
{
    object_ref(OBJECT(ioc));
    return qemu_fopen_ops(ioc, &channel_output_ops);
}