Ejemplo n.º 1
0
static int buffered_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
{
    QEMUFileBuffered *s = opaque;
    int offset = 0, error;
    ssize_t ret;

    DPRINTF("putting %d bytes at %" PRId64 "\n", size, pos);

    error = qemu_file_get_error(s->file);
    if (error) {
        DPRINTF("flush when error, bailing: %s\n", strerror(-error));
        return error;
    }

    DPRINTF("unfreezing output\n");
    s->freeze_output = 0;

    buffered_flush(s);

    while (!s->freeze_output && offset < size) {
        if (s->bytes_xfer > s->xfer_limit) {
            DPRINTF("transfer limit exceeded when putting\n");
            break;
        }

        ret = s->put_buffer(s->opaque, buf + offset, size - offset);
        if (ret == -EAGAIN) {
            DPRINTF("backend not ready, freezing\n");
            s->freeze_output = 1;
            break;
        }

        if (ret <= 0) {
            DPRINTF("error putting\n");
            qemu_file_set_error(s->file, ret);
            offset = -EINVAL;
            break;
        }

        DPRINTF("put %zd byte(s)\n", ret);
        offset += ret;
        s->bytes_xfer += ret;
    }

    if (offset >= 0) {
        DPRINTF("buffering %d bytes\n", size - offset);
        buffered_append(s, buf + offset, size - offset);
        offset = size;
    }

    if (pos == 0 && size == 0) {
        DPRINTF("file is ready\n");
        if (s->bytes_xfer <= s->xfer_limit) {
            DPRINTF("notifying client\n");
            s->put_ready(s->opaque);
        }
    }

    return offset;
}
Ejemplo n.º 2
0
static int buffered_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
{
    QEMUFileBuffered *s = opaque;
    int offset = 0;
    ssize_t ret;

    DPRINTF("putting %d bytes at %" PRId64 "\n", size, pos);

    if (s->has_error) {
        DPRINTF("flush when error, bailing\n");
        return -EINVAL;
    }

    DPRINTF("unfreezing output\n");
    s->freeze_output = 0;

    buffered_flush(s);

    while (!s->freeze_output && offset < size) {
        if (s->bytes_xfer > s->xfer_limit) {
            DPRINTF("transfer limit exceeded when putting\n");
            break;
        }

        ret = s->put_buffer(s->opaque, buf + offset, size - offset);
        if (ret == -EAGAIN) {
            DPRINTF("backend not ready, freezing\n");
            s->freeze_output = 1;
            break;
        }

        if (ret <= 0) {
            DPRINTF("error putting\n");
            s->has_error = 1;
            offset = -EINVAL;
            break;
        }

        DPRINTF("put %zd byte(s)\n", ret);
        offset += ret;
        s->bytes_xfer += ret;
    }

    if (offset >= 0) {
        DPRINTF("buffering %d bytes\n", size - offset);
        buffered_append(s, buf + offset, size - offset);
        offset = size;
    }

    return offset;
}