C++ qemu_free函数代码示例

static void eth_cleanup(VLANClientState *nc)
{
	struct fs_eth *eth = DO_UPCAST(NICState, nc, nc)->opaque;

        cpu_unregister_io_memory(eth->ethregs);

	/* Disconnect the client.  */
	eth->dma_out->client.push = NULL;
	eth->dma_out->client.opaque = NULL;
	eth->dma_in->client.opaque = NULL;
	eth->dma_in->client.pull = NULL;
        qemu_free(eth);
}

SkinScreen* skin_reload_configuration(SkinScreen *skin, const char *file)
{
    SkinConfig *old_config;

    old_config = skin->config;
    skin->config = (SkinConfig*) qemu_mallocz(sizeof(SkinConfig));
    if (skin_load_file(skin, file)) {
        qemu_free(skin->config);
        skin->config = old_config;
        return NULL;
    }

    skin_layout_free(old_config->landscape);
    skin_layout_free(old_config->portrait);
    qemu_free(old_config);
    qemu_free(skin->path);

    skin->path = (char *)qemu_malloc(strlen(file) + 1);
    strcpy(skin->path, file);

    return skin;
}

void migrate_fd_release(MigrationState *mig_state)
{
    FdMigrationState *s = migrate_to_fms(mig_state);

    DPRINTF("releasing state\n");
   
    if (s->state == MIG_STATE_ACTIVE) {
        s->state = MIG_STATE_CANCELLED;
        notifier_list_notify(&migration_state_notifiers);
        migrate_fd_cleanup(s);
    }
    qemu_free(s);
}

/* Initialize the MSI-X structures. Note: if MSI-X is supported, BAR size is
 * modified, it should be retrieved with msix_bar_size. */
int msix_init(struct PCIDevice *dev, unsigned short nentries,
              MemoryRegion *bar,
              unsigned bar_nr, unsigned bar_size)
{
    int ret;
    /* Nothing to do if MSI is not supported by interrupt controller */
    if (!msix_supported)
        return -ENOTSUP;

    if (nentries > MSIX_MAX_ENTRIES)
        return -EINVAL;

    dev->msix_entry_used = qemu_mallocz(MSIX_MAX_ENTRIES *
                                        sizeof *dev->msix_entry_used);

    dev->msix_table_page = qemu_mallocz(MSIX_PAGE_SIZE);
    msix_mask_all(dev, nentries);

    memory_region_init_io(&dev->msix_mmio, &msix_mmio_ops, dev,
                          "msix", MSIX_PAGE_SIZE);

    dev->msix_entries_nr = nentries;
    ret = msix_add_config(dev, nentries, bar_nr, bar_size);
    if (ret)
        goto err_config;

    dev->cap_present |= QEMU_PCI_CAP_MSIX;
    msix_mmio_setup(dev, bar);
    return 0;

err_config:
    dev->msix_entries_nr = 0;
    memory_region_destroy(&dev->msix_mmio);
    qemu_free(dev->msix_table_page);
    dev->msix_table_page = NULL;
    qemu_free(dev->msix_entry_used);
    dev->msix_entry_used = NULL;
    return ret;
}

static VirtIOBlockReq *virtio_blk_get_request(VirtIOBlock *s)
{
    VirtIOBlockReq *req = virtio_blk_alloc_request(s);

    if (req != NULL) {
        if (!virtqueue_pop(s->vq, &req->elem)) {
            qemu_free(req);
            return NULL;
        }
    }

    return req;
}

static int buffered_close(void *opaque)
{
    QEMUFileBuffered *s = opaque;
    int ret;

    DPRINTF("closing\n");

    while (!s->has_error && s->buffer_size) {
        buffered_flush(s);
        if (s->freeze_output)
            s->wait_for_unfreeze(s);
    }

    ret = s->close(s->opaque);

    qemu_del_timer(s->timer);
    qemu_free_timer(s->timer);
    qemu_free(s->buffer);
    qemu_free(s);

    return ret;
}

/*
 * Get the list and pass to each layer to find out whether
 * to send the data or not
 */
ssize_t v9fs_list_xattr(FsContext *ctx, const char *path,
                        void *value, size_t vsize)
{
    ssize_t size = 0;
    void *ovalue = value;
    XattrOperations *xops;
    char *orig_value, *orig_value_start;
    ssize_t xattr_len, parsed_len = 0, attr_len;

    /* Get the actual len */
    xattr_len = llistxattr(rpath(ctx, path), value, 0);
    if (xattr_len <= 0) {
        return xattr_len;
    }

    /* Now fetch the xattr and find the actual size */
    orig_value = qemu_malloc(xattr_len);
    xattr_len = llistxattr(rpath(ctx, path), orig_value, xattr_len);

    /* store the orig pointer */
    orig_value_start = orig_value;
    while (xattr_len > parsed_len) {
        xops = get_xattr_operations(ctx->xops, orig_value);
        if (!xops) {
            goto next_entry;
        }

        if (!value) {
            size += xops->listxattr(ctx, path, orig_value, value, vsize);
        } else {
            size = xops->listxattr(ctx, path, orig_value, value, vsize);
            if (size < 0) {
                goto err_out;
            }
            value += size;
            vsize -= size;
        }
next_entry:
        /* Got the next entry */
        attr_len = strlen(orig_value) + 1;
        parsed_len += attr_len;
        orig_value += attr_len;
    }
    if (value) {
        size = value - ovalue;
    }

err_out:
    qemu_free(orig_value_start);
    return size;
}

MigrationState *exec_start_outgoing_migration(const char *command,
                                             int64_t bandwidth_limit,
                                             int detach)
{
    FdMigrationState *s;
    FILE *f;

    s = qemu_mallocz(sizeof(*s));

    f = popen(command, "w");
    if (f == NULL) {
        dprintf("Unable to popen exec target\n");
        goto err_after_alloc;
    }

    s->fd = fileno(f);
    if (s->fd == -1) {
        dprintf("Unable to retrieve file descriptor for popen'd handle\n");
        goto err_after_open;
    }

    if (fcntl(s->fd, F_SETFD, O_NONBLOCK) == -1) {
        dprintf("Unable to set nonblocking mode on file descriptor\n");
        goto err_after_open;
    }

    s->opaque = qemu_popen(f, "w");

    s->close = exec_close;
    s->get_error = file_errno;
    s->write = file_write;
    s->mig_state.cancel = migrate_fd_cancel;
    s->mig_state.get_status = migrate_fd_get_status;
    s->mig_state.release = migrate_fd_release;

    s->state = MIG_STATE_ACTIVE;
    s->mon_resume = NULL;
    s->bandwidth_limit = bandwidth_limit;

    if (!detach)
        migrate_fd_monitor_suspend(s);

    migrate_fd_connect(s);
    return &s->mig_state;

err_after_open:
    pclose(f);
err_after_alloc:
    qemu_free(s);
    return NULL;
}

static void
vreader_emul_delete(VReaderEmul *vreader_emul)
{
    if (vreader_emul == NULL) {
        return;
    }
    if (vreader_emul->slot) {
        PK11_FreeSlot(vreader_emul->slot);
    }
    if (vreader_emul->type_params) {
        g_free(vreader_emul->type_params);
    }
    qemu_free(vreader_emul);
}

static void virtio_blk_flush_complete(void *opaque, int ret)
{
    VirtIOBlockReq *req = opaque;

    if (ret) {
        if (virtio_blk_handle_rw_error(req, -ret, 0)) {
            return;
        }
    }

    virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
    bdrv_acct_done(req->dev->bs, &req->acct);
    qemu_free(req);
}

void *qemu_realloc(void *ptr, size_t size)
{
    size_t old_size, copy;
    void *new_ptr;

    if (!ptr)
        return qemu_malloc(size);
    old_size = *(size_t *)((char *)ptr - 16);
    copy = old_size < size ? old_size : size;
    new_ptr = qemu_malloc(size);
    memcpy(new_ptr, ptr, copy);
    qemu_free(ptr);
    return new_ptr;
}

static void qemu_rbd_close(BlockDriverState *bs)
{
    BDRVRBDState *s = bs->opaque;

    close(s->fds[0]);
    close(s->fds[1]);
    qemu_aio_set_fd_handler(s->fds[RBD_FD_READ], NULL , NULL, NULL, NULL,
        NULL);

    rbd_close(s->image);
    rados_ioctx_destroy(s->io_ctx);
    qemu_free(s->snap);
    rados_shutdown(s->cluster);
}

static void usb_host_handle_destroy(USBDevice *dev)
{
    USBHostDevice *s = (USBHostDevice *)dev;
    int i;

    if (!s)
        return;

    for (i = 0; i < s->num_interfaces; i++)
        usb_release_interface(s->udev, i);
    usb_close(s->udev);
    s->udev = NULL;
    qemu_free(s);
}

static void *load_at(int fd, int offset, int size)
{
    void *ptr;
    if (lseek(fd, offset, SEEK_SET) < 0)
        return NULL;
    ptr = qemu_malloc(size);
    if (!ptr)
        return NULL;
    if (read(fd, ptr, size) != size) {
        qemu_free(ptr);
        return NULL;
    }
    return ptr;
}

int qcow2_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
{
    BDRVQcowState *s = bs->opaque;
    QCowSnapshot *sn;
    int snapshot_index, ret;

    if (bs->read_only)
	return -EACCES;

    snapshot_index = find_snapshot_by_id_or_name(bs, snapshot_id);
    if (snapshot_index < 0)
        return -ENOENT;
    sn = &s->snapshots[snapshot_index];

    ret = qcow2_update_snapshot_refcount(bs, sn->l1_table_offset, sn->l1_size, -1);
    if (ret < 0)
        return ret;
    /* must update the copied flag on the current cluster offsets */
    ret = qcow2_update_snapshot_refcount(bs, s->l1_table_offset, s->l1_size, 0);
    if (ret < 0)
        return ret;
    qcow2_free_clusters(bs, sn->l1_table_offset, sn->l1_size * sizeof(uint64_t));

    qemu_free(sn->id_str);
    qemu_free(sn->name);
    memmove(sn, sn + 1, (s->nb_snapshots - snapshot_index - 1) * sizeof(*sn));
    s->nb_snapshots--;
    ret = qcow_write_snapshots(bs);
    if (ret < 0) {
        /* XXX: restore snapshot if error ? */
        return ret;
    }
#ifdef DEBUG_ALLOC
    qcow2_check_refcounts(bs);
#endif
    return 0;
}